Recent user-visible changes to Tcl: SCCS: @(#) changes 1.142 96/08/01 17:00:22 1. No more [command1] [command2] construct for grouping multiple commands on a single command line. 2. Semi-colon now available for grouping commands on a line. 3. For a command to span multiple lines, must now use backslash-return at the end of each line but the last. 4. "Var" command has been changed to "set". 5. Double-quotes now available as an argument grouping character. 6. "Return" may be used at top-level. 7. More backslash sequences available now. In particular, backslash-newline may be used to join lines in command files. 8. New or modified built-in commands: case, return, for, glob, info, print, return, set, source, string, uplevel. 9. After an error, the variable "errorInfo" is filled with a stack trace showing what was being executed when the error occurred. 10. Command abbreviations are accepted when parsing commands, but are not recommended except for purely-interactive commands. 11. $, set, and expr all complain now if a non-existent variable is referenced. 12. History facilities exist now. See Tcl.man and Tcl_RecordAndEval.man. 13. Changed to distinguish between empty variables and those that don't exist at all. Interfaces to Tcl_GetVar and Tcl_ParseVar have changed (NULL return value is now possible). *** POTENTIAL INCOMPATIBILITY *** 14. Changed meaning of "level" argument to "uplevel" command (1 now means "go up one level", not "go to level 1"; "#1" means "go to level 1"). *** POTENTIAL INCOMPATIBILITY *** 15. 3/19/90 Added "info exists" option to see if variable exists. 16. 3/19/90 Added "noAbbrev" variable to prohibit command abbreviations. 17. 3/19/90 Added extra errorInfo option to "error" command. 18. 3/21/90 Double-quotes now only affect space: command, variable, and backslash substitutions still occur inside double-quotes. *** POTENTIAL INCOMPATIBILITY *** 19. 3/21/90 Added support for \r. 20. 3/21/90 List, concat, eval, and glob commands all expect at least one argument now. *** POTENTIAL INCOMPATIBILITY *** 21. 3/22/90 Added "?:" operators to expressions. 22. 3/25/90 Fixed bug in Tcl_Result that caused memory to get trashed. ------------------- Released version 3.1 --------------------- 23. 3/29/90 Fixed bug that caused "file a.b/c ext" to return ".b/c". 24. 3/29/90 Semi-colon is not treated specially when enclosed in double-quotes. ------------------- Released version 3.2 --------------------- 25. 4/16/90 Rewrote "exec" not to use select or signals anymore. Should be more Sys-V compatible, and no slower in the normal case. 26. 4/18/90 Rewrote "glob" to eliminate GNU code (there's no GNU code left in Tcl, now), and added Tcl_TildeSubst procedure. Added automatic tilde-substitution in many commands, including "glob". ------------------- Released version 3.3 --------------------- 27. 7/11/90 Added "Tcl_AppendResult" procedure. 28. 7/20/90 "History" with no options now defaults to "history info" rather than to "history redo". Although this is a backward incompatibility, it should only be used interactively and thus shouldn't present any compatibility problems with scripts. 29. 7/20/90 Added "Tcl_GetInteger", "Tcl_GetDouble", and "Tcl_GetBoolean" procedures. 30. 7/22/90 Removed "Tcl_WatchInterp" procedure: doesn't seem to be necessary, since the same effect can be achieved with the deletion callbacks on individual commands. *** POTENTIAL INCOMPATIBILITY *** 31. 7/23/90 Added variable tracing: Tcl_TraceVar, Tcl_UnTraceVar, and Tcl_VarTraceInfo procedures, "trace" command. 32. 8/9/90 Mailed out list of all bug fixes since 3.3 release. 33. 8/29/90 Fixed bugs in Tcl_Merge relating to backslashes and semi-colons. Mailed out patch. 34. 9/3/90 Fixed bug in tclBasic.c: quotes weren't quoting ]'s. Mailed out patch. 35. 9/19/90 Rewrote exec to always use files both for input and output to the process. The old pipe-based version didn't work if the exec'ed process forked a child and then exited: Tcl waited around for stdout to get closed, which didn't happen until the grandchild exited. 36. 11/5/90 ERR_IN_PROGRESS flag wasn't being cleared soon enough in Tcl_Eval, allowing error messages from different commands to pile up in $errorInfo. Fixed by re-arranging code in Tcl_Eval that re-initializes result and ERR_IN_PROGRESS flag. Didn't mail out patch: changes too complicated to describe. 37. 12/19/90 Added Tcl_VarEval procedure as a convenience for assembling and executing Tcl commands. 38. 1/29/91 Fixed core leak in Tcl_AddErrorInfo. Also changed procedure and Tcl_Eval so that first call to Tcl_AddErrorInfo need not come from Tcl_Eval. ----------------- Released version 5.0 with Tk ------------------ 39. 4/3/91 Removed change bars from manual entries, leaving only those that came after version 3.3 was released. 40. 5/17/91 Changed tests to conform to Mary Ann May-Pumphrey's approach. 41. 5/23/91 Massive revision to Tcl parser to simplify the implementation of string and floating-point support in expressions. Newlines inside [] are now treated as command separators rather than word separators (this makes newline treatment consistent throughout Tcl). *** POTENTIAL INCOMPATIBILITY *** 42. 5/23/91 Massive rewrite of expression code to support floating-point values and simple string comparisons. The C interfaces to expression routines have changed (Tcl_Expr is replaced by Tcl_ExprLong, Tcl_ExprDouble, etc.), but all old Tcl expression strings should be accepted by the new expression code. *** POTENTIAL INCOMPATIBILITY *** 43. 5/23/91 Modified tclHistory.c to check for negative "keep" value. 44. 5/23/91 Modified Tcl_Backslash to handle backslash-newline. It now returns 0 to indicate that a backslash sequence should be replaced by no character at all. *** POTENTIAL INCOMPATIBILITY *** 45. 5/29/91 Modified to use ANSI C function prototypes. Must set "USE_ANSI" switch when compiling to get prototypes. 46. 5/29/91 Completed test suite by providing tests for all of the built-in Tcl commands. 47. 5/29/91 Changed Tcl_Concat to eliminate leading and trailing white-space in each of the things it concatenates and to ignore elements that are empty or have only white space in them. This produces cleaner output from the "concat" command. *** POTENTIAL INCOMPATIBILITY *** 48. 5/31/91 Changed "set" command and Tcl_SetVar procedure to return new value of variable. 49. 6/1/91 Added "while" and "cd" commands. 50. 6/1/91 Changed "exec" to delete the last character of program output if it is a newline. In most cases this makes it easier to process program-generated output. *** POTENTIAL INCOMPATIBILITY *** 51. 6/1/91 Made sure that pointers are never used after freeing them. 52. 6/1/91 Fixed bug in TclWordEnd where it wasn't dealing with [] inside quotes correctly. 53. 6/8/91 Fixed exec.test to accept return values of either 1 or 255 from "false" command. 54. 7/6/91 Massive overhaul of variable management. Associative arrays now available, along with "unset" command (and Tcl_UnsetVar procedure). Variable traces have been completely reworked: interfaces different both from Tcl and C, and multiple traces may exist on same variable. Can no longer redefine existing local variable to be global. Calling sequences have changed slightly for Tcl_GetVar and Tcl_SetVar ("global" is now "flags"). Tcl_SetVar can fail and return a NULL result. New forms of variable-manipulation procedures: Tcl_GetVar2, Tcl_SetVar2, etc. Syntax of variable $-notation changed to support array indexing. *** POTENTIAL INCOMPATIBILITY *** 55. 7/6/91 Added new list-manipulation procedures: Tcl_ScanElement, Tcl_ConvertElement, Tcl_AppendElement. 56. 7/12/91 Created new procedure Tcl_EvalFile, which does most of the work of the "source" command. 57. 7/20/91 Major reworking of "exec" command to allow pipelines, more redirection, background. Added new procedures Tcl_Fork, Tcl_WaitPids, Tcl_DetachPids, and Tcl_CreatePipeline. The old "< input" notation has been replaced by "<< input" ("<" is for redirection from a file). Also handles error returns and abnormal terminations (e.g. signals) differently. *** POTENTIAL INCOMPATIBILITY *** 58. 7/21/91 Added "append" and "lappend" commands. 59. 7/22/91 Reworked error messages and manual entries to use ?x? as the notation for an optional argument x, instead of [x]. The bracket notation was often confused with the use of brackets for command substitution. Also modified error messages to be more consistent. 60. 7/23/91 Tcl_DeleteCommand now returns an indication of whether or not the command actually existed, and the "rename" command uses this information to return an error if an attempt is made to delete a non-existent command. *** POTENTIAL INCOMPATIBILITY *** 61. 7/25/91 Added new "errorCode" mechanism, along with procedures Tcl_SetErrorCode, Tcl_UnixError, and Tcl_ResetResult. Renamed Tcl_Return to Tcl_SetResult, but left a #define for Tcl_Return to avoid compatibility problems. 62. 7/26/91 Extended "case" command with alternate syntax where all patterns and commands are together in a single list argument: makes it easier to write multi-line case statements. 63. 7/27/91 Changed "print" command to perform tilde-substitution on the file name. 64. 7/27/91 Added "tolower", "toupper", "trim", "trimleft", and "trimright" options to "string" command. 65. 7/29/91 Added "atime", "mtime", "size", and "stat" options to "file" command. 66. 8/1/91 Added "split" and "join" commands. 67. 8/11/91 Added commands for file I/O, including "open", "close", "read", "gets", "puts", "flush", "eof", "seek", and "tell". 68. 8/14/91 Switched to use a hash table for command lookups. Command abbreviations no longer have direct support in the Tcl interpreter, but it should be possible to simulate them with the auto-load features described below. The "noAbbrev" variable is no longer used by Tcl. *** POTENTIAL INCOMPATIBILITY *** 68.5 8/15/91 Added support for "unknown" command, which can be used to complete abbreviations, auto-load library files, auto-exec shell commands, etc. 69. 8/15/91 Added -nocomplain switch to "glob" command. 70. 8/20/91 Added "info library" option and TCL_LIBRARY #define. Also added "info script" option. 71. 8/20/91 Changed "file" command to take "option" argument as first argument (before file name), for consistency with other Tcl commands. *** POTENTIAL INCOMPATIBILITY *** 72. 8/20/91 Changed format of information in $errorInfo variable: comments such as ("while" body line 1) are now on separate lines from commands being executed. *** POTENTIAL INCOMPATIBILITY *** 73. 8/20/91 Changed Tcl_AppendResult so that it (eventually) frees large buffers that it allocates. 74. 8/21/91 Added "linsert", "lreplace", "lsearch", and "lsort" commands. 75. 8/28/91 Added "incr" and "exit" commands. 76. 8/30/91 Added "regexp" and "regsub" commands. 77. 9/4/91 Changed "dynamic" field in interpreters to "freeProc" (procedure address). This allows for alternative storage managers. *** POTENTIAL INCOMPATIBILITY *** 78. 9/6/91 Added "index", "length", and "range" options to "string" command. Added "lindex", "llength", and "lrange" commands. 79. 9/8/91 Removed "index", "length", "print" and "range" commands. "Print" is redundant with "puts", but less general, and the other commands are replaced with the new commands described in change 78 above. *** POTENTIAL INCOMPATIBILITY *** 80. 9/8/91 Changed history revision to occur even when history command is nested; needed in order to allow "history" to be invoked from "unknown" procedure. 81. 9/13/91 Changed "panic" not to use vfprintf (it's uglier and less general now, but makes it easier to run Tcl on systems that don't have vfprintf). Also changed "strerror" not to redeclare sys_errlist. 82. 9/19/91 Lots of changes to improve portability to different UNIX systems, including addition of "config" script to adapt Tcl to the configuration of the system it's being compiled on. 83. 9/22/91 Added "pwd" command. 84. 9/22/91 Renamed manual pages so that their filenames are no more than 14 characters in length, moved to "doc" subdirectory. 85. 9/24/91 Redid manual entries so they contain the supplemental macros that they need; can just print with "troff -man" or "man" now. 86. 9/26/91 Created initial version of script library, including a version of "unknown" that does auto-loading, auto-execution, and abbreviation expansion. This library is used by tclTest automatically. See the "library" manual entry for details. ----------------- Released version 6.0, 9/26/91 ------------------ 87. 9/30/91 Made "string tolower" and "string toupper" check case before converting: on some systems, "tolower" and "toupper" assume that character already has particular case. 88. 9/30/91 Fixed bug in Tcl_SetResult: wasn't always setting freeProc correctly when called with NULL value. This tended to cause memory allocation errors later. 89. 10/3/91 Added "upvar" command. 90. 10/4/91 Changed "format" so that internally it converts %D to %ld, %U to %lu, %O to %lo, and %F to %f. This eliminates some compatibility problems on some machines without affecting behavior. 91. 10/10/91 Fixed bug in "regsub" that caused core dumps with the -all option when the last match wasn't at the end of the string. 92. 10/17/91 Fixed problems with backslash sequences: \r support was incomplete and \f and \v weren't supported at all. 93. 10/24/91 Added Tcl_InitHistory procedure. 94. 10/24/91 Changed "regexp" to store "-1 -1" in subMatchVars that don't match, rather than returning an error. 95. 10/27/91 Modified "regexp" to return actual strings in matchVar and subMatchVars instead of indices. Added "-indices" switch to cause indices to be returned. *** POTENTIAL INCOMPATIBILITY *** 96. 10/27/91 Fixed bug in "scan" where it used hardwired constants for sizes of floats and doubles instead of using "sizeof". 97. 10/31/91 Fixed bug in tclParse.c where parse-related error messages weren't being storage-managed correctly, causing spurious free's. 98. 10/31/91 Form feed and vertical tab characters are now considered to be space characters by the parser. 99. 10/31/91 Added TCL_LEAVE_ERR_MSG flag to procedures like Tcl_SetVar. 100. 11/7/91 Fixed bug in "case" where "in" argument couldn't be omitted if all case branches were embedded in a single list. 101. 11/7/91 Switched to use "pid_t" and "uid_t" and other official POSIC types and function prototypes. ----------------- Released version 6.1, 11/7/91 ------------------ 102. 12/2/91 Modified Tcl_ScanElement and Tcl_ConvertElement in several ways. First, allowed caller to request that only backslashes be used (no braces). Second, made Tcl_ConvertElement more aggressive in using backslashes for braces and quotes. 103. 12/5/91 Added "type", "lstat", and "readlink" options to "file" command, plus added new "type" element to output of "stat" and "lstat" options. 104. 12/10/91 Manual entries had first lines that caused "man" program to try weird preprocessor. Added blank comment lines to fix problem. 105. 12/16/91 Fixed a few bugs in auto_mkindex proc: wasn't handling errors properly, and hadn't been upgraded for new "regexp" syntax. 106. 1/2/92 Fixed bug in "file" command where it didn't properly handle a file names containing tildes where the indicated user doesn't exist. 107. 1/2/92 Fixed lots of cases in tclUnixStr.c where two different errno symbols (e.g. EWOULDBLOCK and EAGAIN) have the same number; Tcl will only use one of them. 108. 1/2/92 Lots of changes to configuration script to handle many more systems more gracefully. E.g. should now detect the bogus strtoul that comes with AIX and substitute Tcl's own version instead. ----------------- Released version 6.2, 1/10/92 ------------------ 109. 1/20/92 Config didn't have code to actually use "uid_t" variable to set TCL_UIT_T #define. 110. 2/10/92 Tcl_Eval didn't properly reset "numLevels" variable when too-deep recursion occurred. 111. 2/29/92 Added "on" and "off" to keywords accepted by Tcl_GetBoolean. 112. 3/19/92 Config wasn't installing default version of strtod.c for systems that don't have one in libc.a. 113. 3/23/92 Fixed bug in tclExpr.c where numbers with leading "."s, like 0.75, couldn't be properly substituted into expressions with variable or command substitution. 114. 3/25/92 Fixed bug in tclUnixAZ.c where "gets" command wasn't checking to make sure that it was able to write the variable OK. 115. 4/16/92 Fixed bug in tclUnixAZ.c where "read" command didn't compute file size right for device files. 116. 4/23/92 Fixed but in tclCmdMZ.c where "trace vinfo" was overwriting the trace command. ----------------- Released version 6.3, 5/1/92 ------------------ 117. 5/1/92 Added Tcl_GlobalEval. 118. 6/1/92 Changed auto-load facility to source files at global level. 119. 6/8/92 Tcl_ParseVar wasn't always setting termPtr after errors, which sometimes caused core dumps. 120. 6/21/92 Fixed bug in initialization of regexp pattern cache. This bug caused segmentation violations in regexp commands under some conditions. 121. 6/22/92 Changed implementation of "glob" command to eliminate trailing slashes on directory names: they confuse some systems. There shouldn't be any user-visible changes in functionality except for names in error messages not having trailing slashes. 122. 7/2/92 Fixed bug that caused 'string match ** ""' to return 0. 123. 7/2/92 Fixed bug in Tcl_CreateCmdBuf where it wasn't initializing the buffer to an empty string. 124. 7/6/92 Fixed bug in "case" command where it used NULL pattern string after errors in the "default" clause. 125. 7/25/92 Speeded up auto_load procedure: don't reread all the index files unless the path has changed. 126. 8/3/92 Changed tclUnix.h to define MAXPATHLEN from PATH_MAX, not _POSIX_PATH_MAX. ----------------- Released version 6.4, 8/7/92 ------------------ 127. 8/10/92 Changed tclBasic.c so that comment lines can be continued by putting a backslash before the newline. 128. 8/21/92 Modified "unknown" to allow the source-ing of a file for an auto-load to trigger other nested auto-loads, as long as there isn't any recursion on the same command name. 129. 8/25/92 Modified "format" command to allow " " and "+" flags, and allow flags in any order. 130. 9/14/92 Modified Tcl_ParseVar so that it doesn't actually attempt to look up the variable if "noEval" mode is in effect in the interpreter (it just parses the name). This avoids the errors that used to occur in statements like "expr {[info exists foo] && $foo}". 131. 9/14/92 Fixed bug in "uplevel" command where it didn't output the correct error message if a level was specified but no command. 132. 9/14/92 Renamed manual entries to have extensions like .3 and .n, and added "install" target to Makefile. 133. 9/18/92 Modified "unknown" command to emulate !!, !, and ^^ csh history substitutions. 134. 9/21/92 Made the config script cleverer about figuring out which switches to pass to "nm". 135. 9/23/92 Fixed tclVar.c to be sure to copy flags when growing variables. Used to forget about traces in progress and make extra recursive calls on trace procs. 136. 9/28/92 Fixed bug in auto_reset where it was unsetting variables that might not exist. 137. 10/7/92 Changed "parray" library procedure to print any array accessible to caller, local or global. 138. 10/15/92 Fixed bug where propagation of new environment variable values among interpreters took N! time if there exist N interpreters. 139. 10/16/92 Changed auto_reset procedure so that it also deletes any existing procedures that are in the auto_load index (the assumption is that they should be re-loaded to get the latest versions). 140. 10/21/92 Fixed bug that caused lists to be incorrectly generated for elements that contained backslash-newline sequences. 141. 12/9/92 Added support for TCL_LIBRARY environment variable: use it as library location if it's present. 142. 12/9/92 Added "info complete" command, Tcl_CommandComplete procedure. 143. 12/16/92 Changed the Makefile to check to make sure "config" has been run (can't run config directly from the Makefile because it modifies the Makefile; thus make has to be run again after running config). ----------------- Released version 6.5, 12/17/92 ------------------ 144. 12/21/92 Changed config to look in several places for libc file. 145. 12/23/92 Added "elseif" support to if. Also, "then", "else", and "elseif" may no longer be abbreviated. *** POTENTIAL INCOMPATIBILITY *** 146. 12/28/92 Changed "puts" and "read" to support initial "-nonewline" switch instead of additional "nonewline" argument. The old form is still supported, but it is discouraged and is no longer documented. Also changed "puts" to make the file argument default to stdout: e.g. "puts foo" will print foo on standard output. 147. 1/6/93 Fixed bug whereby backslash-newline wasn't working when typed interactively, or in "info complete". 148. 1/22/93 Fixed bugs in "lreplace" and "linsert" where close quotes were being lost from last element before replacement or insertion. 149. 1/29/93 Fixed bug in Tcl_AssembleCmd where it wasn't requiring a newline at the end of a line before considering a command to be complete. The bug caused some very long lines in script files to be processed as multiple separate commands. 150. 1/29/93 Various changes in Makefile to add more configuration options, simplify installation, fix bugs (e.g. don't use -f switch for cp), etc. 151. 1/29/93 Changed "name1" and "name2" identifiers to "part1" and "part2" to avoid name conflicts with stupid C++ implementations that use "name1" and "name2" in a reserved way. 152. 2/1/93 Added "putenv" procedure to replace the standard system version so that it will work correctly with Tcl's environment handling. ----------------- Released version 6.6, 2/5/93 ------------------ 153. 2/10/93 Fixed bugs in config script: missing "endif" in libc loop, and tried to use strncasecmp.c instead of strcasecmp.c. 154. 2/10/93 Makefile improvements: added RANLIB variable for easier Sys-V configuration, added SHELL variable for SGI systems. ----------------- Released version 6.7, 2/11/93 ------------------ 153. 2/6/93 Changes in backslash processing: - \Cx, \Mx, \CMx, \e sequences no longer special - \ also eats up any space after the newline, replacing the whole sequence with a single space character - Hex sequences like \x24 are now supported, along with ANSI C's \a. - "format" no longer does backslash processing on its format string - there is no longer any special meaning to a 0 return value from Tcl_Backslash - unknown backslash sequences, like (e.g. \*), are replaced with the following character (e.g. *), instead of just treating the backslash as an ordinary character. *** POTENTIAL INCOMPATIBILITY *** 154. 2/6/93 Updated all copyright notices. The meaning hasn't changed at all but the wording does a better job of protecting U.C. from liability (according to U.C. lawyers, anyway). 155. 2/6/93 Changed "regsub" so that it overwrites the result variable in all cases, even if there is no match. *** POTENTIAL INCOMPATIBILITY *** 156. 2/8/93 Added support for XPG3 %n$ conversion specifiers to "format" command. 157. 2/17/93 Fixed bug in Tcl_Eval where errors due to infinite recursion could result in core dumps. 158. 2/17/93 Improved the auto-load mechanism to deal gracefully (i.e. return an error) with a situation where a library file that supposedly defines a procedure doesn't actually define it. 159. 2/17/93 Renamed Tcl_UnixError procedure to Tcl_PosixError, and changed errorCode variable usage to use POSIX as keyword instead of UNIX. *** POTENTIAL INCOMPATIBILITY *** 160. 2/19/93 Changes to exec and process control: - Added support for >>, >&, >>&, |&, <@, >@, and >&@ forms of redirection. - When exec puts processes into background, it returns a list of their pids as result. - Added support for file, etc. (i.e. no space between ">" and file name. - Added -keepnewline option. - Deleted Tcl_Fork and Tcl_WaitPids procedures (just use fork and waitpid instead). - Added waitpid compatibility procedure for systems that don't have it. - Added Tcl_ReapDetachedProcs procedure. - Changed "exec" to return an error if there is stderr output, even if the command returns a 0 exit status (it's always been documented this way, but the implementation wasn't correct). - If a process returns a non-zero exit status but doesn't generate any diagnostic output, then Tcl generates an error message for it. *** POTENTIAL INCOMPATIBILITY *** 161. 2/25/93 Fixed two memory-management problems having to do with managing the old result during variable trace callbacks. 162. 3/1/93 Added dynamic string library: Tcl_DStringInit, Tcl_DStringAppend, Tcl_DStringFree, Tcl_DStringResult, etc. 163. 3/1/93 Modified glob command to only return the names of files that exist, and to only return names ending in "/" if the file is a directory. *** POTENTIAL INCOMPATIBILITY *** 164. 3/19/93 Modified not to use system calls like "read" directly, but instead to use special Tcl procedures that retry automatically if interrupted by signals. 165. 4/3/93 Eliminated "noSep" argument to Tcl_AppendElement, plus TCL_NO_SPACE flag for Tcl_SetVar and Tcl_SetVar2. *** POTENTIAL INCOMPATIBILITY *** 166. 4/3/93 Eliminated "flags" and "termPtr" arguments to Tcl_Eval. *** POTENTIAL INCOMPATIBILITY *** 167. 4/3/93 Changes to expressions: - The "expr" command now accepts multiple arguments, which are concatenated together with space separators. - Integers aren't automatically promoted to floating-point if they overflow the word size: errors are generated instead. - Tcl can now handle "NaN" and other special values if the underlying library procedures handle them. - When printing floating-point numbers, Tcl ensures that there is a "." or "e" in the number, so it can't be treated as an integer accidentally. The procedure Tcl_PrintDouble is available to provide this function in other contexts. Also, the variable "tcl_precision" can be used to set the precision for printing (must be a decimal number giving digits of precision). - Expressions now support transcendental and other functions, e.g. sin, acos, hypot, ceil, and round. Can add new math functions with Tcl_CreateMathFunc(). - Boolean expressions can now have any of the string values accepted by Tcl_GetBoolean, such as "yes" or "no". *** POTENTIAL INCOMPATIBILITY *** 168. 4/5/93 Changed Tcl_UnsetVar and Tcl_UnsetVar2 to return TCL_OK or TCL_ERROR instead of 0 or -1. *** POTENTIAL INCOMPATIBILITY *** 169. 4/5/93 Eliminated Tcl_CmdBuf structure and associated procedures; can use Tcl_DStrings instead. *** POTENTIAL INCOMPATIBILITY *** 170. 4/8/93 Changed interface to Tcl_TildeSubst to use a dynamic string for buffer space. This makes the procedure re-entrant and thread-safe, whereas it wasn't before. *** POTENTIAL INCOMPATIBILITY *** 171. 4/14/93 Eliminated tclHash.h, and moved everything from it to tcl.h *** POTENTIAL INCOMPATIBILITY *** 172. 4/15/93 Eliminated Tcl_InitHistory, made "history" command always be part of interpreter. *** POTENTIAL INCOMPATIBILITY *** 173. 4/16/93 Modified "file" command so that "readable" option always exists, even on machines that don't support symbolic links (always returns same error as if the file wasn't a symbolic link). 174. 4/26/93 Fixed bugs in "regsub" where ^ patterns didn't get handled right (pretended not to match when it really did, and looped infinitely if -all was specified). 175. 4/29/93 Various improvements in the handling of variables: - Can create variables and array elements during a read trace. - Can delete variables during traces (note: unset traces will be invoked when this happens). - Can upvar to array elements. - Can retarget an upvar to another variable by re-issuing the upvar command with a different "other" variable. 176. 5/3/93 Added Tcl_GetCommandInfo, which returns info about a Tcl command such as whether it exists and its ClientData. Also added Tcl_SetCommandInfo, which allows any of this information to be modified and also allows a command's delete procedure to have a different ClientData value than its command procedure. 177. 5/5/93 Added Tcl_RegExpMatch procedure. 178. 5/6/93 Fixed bug in "scan" where it didn't properly handle %% conversion specifiers. Also changed "scan" to use Tcl_PrintDouble for printing real values. 179. 5/7/93 Added "-exact", "-glob", and "-regexp" options to "lsearch" command to allow different kinds of pattern matching. 180. 5/7/93 Added many new switches to "lsort" to control the sorting process: "-ascii", "-integer", "-real", "-command", "-increasing", and "-decreasing". 181. 5/10/93 Changes to file I/O: - Modified "open" command to support a list of POSIX access flags like {WRONLY CREAT TRUNC} in addition to current fopen-style access modes. Also added "permissions" argument to set permissions of newly-created files. - Fixed Scott Bolte's bug (can close stdin etc. in application and then re-open them with Tcl commands). - Exported access to Tcl's file table with new procedures Tcl_EnterFile and Tcl_GetOpenFile. 182. 5/15/93 Added new "pid" command, which can be used to retrieve either the current process id or a list of the process ids in a pipeline opened with "open |..." 183. 6/3/93 Changed to use GNU autoconfig for configuration instead of the home-brew "config" script. Also made many other configuration-related changes, such as using instead of explicitly declaring system calls in tclUnix.h. 184. 6/4/93 Fixed bug where core-dumps could occur if a procedure redefined itself (the memory for the procedure's body could get reallocated in the middle of evaluating the body); implemented simple reference count mechanism. 185. 6/5/93 Changed tclIndex file format in two ways: (a) it's now eval-ed instead of parsed, which makes it 3-4x faster; (b) the entries in auto_index are now commands to evaluate, which allows commands to be loaded in different ways such as dynamic-loading of C code. The old tclIndex file format is still supported. 186. 6/7/93 Eliminated tclTest program, added new "tclsh" program that is more like wish (allows script files to be invoked automatically using "#!/usr/local/bin/tclsh", makes arguments available to script, etc.). Added support for Tcl_AppInit plus default version; this allows new Tcl applications to be created without modifying the main program for tclsh. 187. 6/7/93 Fixed bug in TclWordEnd that kept backslash-newline from working correctly in some cases during interactive input. 188. 6/9/93 Added Tcl_LinkVar and related procedures, which automatically keep a Tcl variable in sync with a C variable. 189. 6/16/93 Increased maximum nesting depth from 100 to 1000. 190. 6/16/93 Modified "trace var" command so that error messages from within traces are returned properly as the result of the variable access, instead of the generic "access disallowed by trace command" message. 191. 6/16/93 Added Tcl_CallWhenDeleted to provide callbacks when an interpreter is deleted (same functionality as Tcl_WatchInterp, which used to exist in versions before 6.0). 193. 6/16/93 Added "-code" argument to "return" command; it's there primarily for completeness, so that procedures implementing control constructs can reflect exceptional conditions back to their callers. 194. 6/16/93 Split up Tcl.n to make separate manual entries for each Tcl command. Tcl.n now contains a summary of the language syntax. 195. 6/17/93 Added new "switch" command to replace "case": allows alternate forms of pattern matching (exact, glob, regexp), replaces pattern lists with single patterns (but you can use "-" bodies to share one body among several patterns), eliminates "in" noise word. "Case" command is now obsolete. 196. 6/17/93 Changed the "exec", "glob", "regexp", and "regsub" commands to include a "--" switch. All initial arguments starting with "-" are now treated as switches unless a "--" switch is present to end the list. *** POTENTIAL INCOMPATIBILITY *** 197. 6/17/93 Changed auto-exec so that the subprocess gets stdin, stdout, and stderr from the parent. This allows truly interactive sub-processes (e.g. vi) to be auto-exec'ed from a tcl shell command line. 198. 6/18/93 Added patchlevel.h, for use in coordinating future patch releases, and also added "info patchlevel" command to make the patch level available to Tcl scripts. 199. 6/19/93 Modified "glob" command so that a leading "//" in a name gets left as is (this is needed for systems like Apollos where "//" is the super-root; Tcl used to collapse the two slashes into a single slash). 200. 7/7/93 Added Tcl_SetRecursionLimit procedure so that the maximum allowable nesting depth can be controlled for an interpreter from C. ----------------- Released version 7.0 Beta 1, 7/9/93 ------------------ 201. 7/12/93 Modified Tcl_GetInt and tclExpr.c so that full-precision unsigned integers can be specified without overflow errors. 202. 7/12/93 Configuration changes: eliminate leading blank line in configure script; provide separate targets in Makefile for installing binary and non-binary information; check for size_t and a few other potentially missing typedefs; don't put tclAppInit.o into libtcl.a; better checks for matherr support. 203. 7/14/93 Changed tclExpr.c to check the termination pointer before errno after strtod calls, to avoid problems with some versions of strtod that set errno in unexpected ways. 204. 7/16/93 Changed "scan" command to be more ANSI-conformant: eliminated %F, %D, etc., added code to ignore "l", "h", and "L" modifiers but always convert %e, %f, and %g with implicit "l"; also added support for %u and %i. Also changed "format" command to eliminate %D, %U, %O, and add %i. *** POTENTIAL INCOMPATIBILITY *** 205. 7/17/93 Changed "uplevel" and "upvar" so that they can be used from global level to global level: this used to generate an error. 206. 7/19/93 Renamed "setenv", "putenv", and "unsetenv" procedures to avoid conflicts with system procedures with the same names. If you want Tcl's procedures to override the system procedures, do it in the Makefile (instructions are in the Makefile). *** POTENTIAL INCOMPATIBILITY *** ----------------- Released version 7.0 Beta 2, 7/21/93 ------------------ 207. 7/21/93 Fixed bug in tclVar.c where freed memory was accidentally used if a procedure returned an element of a local array. 208. 7/22/93 Fixed bug in "unknown" where it didn't properly handle errors occurring in the "auto_load" procedure, leaving its state inconsistent. 209. 7/23/93 Changed exec's ">2" redirection operator to "2>" for consistency with sh. This is incompatible with earlier beta releases of 7.0 but not with pre-7.0 releases, which didn't support either operator. 210. 7/28/93 Changed backslash-newline handling so that the resulting space character *is* treated as a word separator unless the backslash sequence is in quotes or braces. This is incompatible with 7.0b1 and 7.0b2 but is more compatible with pre-7.0 versions that the b1 and b2 releases were. 211. 7/28/93 Eliminated Tcl_LinkedVarWritable, added TCL_LINK_READ_ONLY to Tcl_LinkVar to accomplish same purpose. This change is incompatible with earlier beta releases, but not with releases before Tcl 7.0. 212. 7/29/93 Renamed regexp C functions so they won't clash with POSIX regexp functions that use the same name. 213. 8/3/93 Added "-errorinfo" and "-errorcode" options to "return" command: these allow for much better handling of the errorInfo and errorCode variables in some cases. 214. 8/12/93 Changed "expr" so that % always returns a remainder with the same sign as the divisor and absolute value smaller than the divisor. 215. 8/14/93 Turned off auto-exec in "unknown" unless the command was typed interactively. This means you must use "exec" when invoking subprocesses, unless it's a command that's typed interactively. *** POTENTIAL INCOMPATIBILITY *** 216. 8/14/93 Added support for tcl_prompt1 and tcl_prompt2 variables to tclMain.c: makes prompts user-settable. 217. 8/14/93 Added asynchronous handlers (Tcl_AsyncCreate etc.) so that signals can be taken cleanly by Tcl applications. 218. 8/16/93 Moved information about open files from the interpreter structure to global variables so that a file can be opened in one interpreter and read or written in another. 219. 8/16/93 Removed ENV_FLAGS from Makefile, so that there's no official support for overriding setenv, unsetenv, and putenv. 220. 8/20/93 Various configuration improvements: coerce chars to unsigned chars before using macros like isspace; source ~/.tclshrc file during initialization if it exists and program is running interactively; allow there to be directories in auto_path that don't exist or don't have tclIndex files (ignore them); added Tcl_Init procedure and changed Tcl_AppInit to call it. 221. 8/21/93 Fixed bug in expr where "+", "-", and " " were all getting treated as integers with value 0. 222. 8/26/93 Added "tcl_interactive" variable to tclsh. 223. 8/27/93 Added procedure Tcl_FilePermissions to return whether a given file can be read or written or both. Modified Tcl_EnterFile to take a permissions mask rather than separate read and write arguments. 224. 8/28/93 Fixed performance bug in "glob" command (unnecessary call to "access" for each file caused a 5-10x slow-down for big directories). ----------------- Released version 7.0 Beta 3, 8/28/93 ------------------ 225. 9/9/93 Renamed regexp.h to tclRegexp.h to avoid conflicts with system include file by same name. 226. 9/9/93 Added Tcl_DontCallWhenDeleted. 227. 9/16/93 Changed not to call exit C procedure directly; instead always invoke "exit" Tcl command so that application can redefine the command to do additional cleanup. 228. 9/17/93 Changed auto-exec to handle names that contain slashes (i.e. don't use PATH for them). 229. 9/23/93 Fixed bug in "read" and "gets" commands where they didn't clear EOF conditions. ----------------- Released version 7.0, 9/29/93 ------------------ 230. 10/7/93 "Scan" command wasn't properly aligning things in memory, so segmentation faults could arise under some circumstances. 231. 10/7/93 Fixed bug in Tcl_ConvertElement where it forgot to backslash leading curly brace when creating lists. 232. 10/7/93 Eliminated dependency of tclMain.c on tclInt.h and tclUnix.h, so that people can copy the file out of the Tcl source directory to make modified private versions. 233. 10/8/93 Fixed bug in auto-loader that reversed the priority order of entries in auto_path for new-style index files. Now things are back to the way they were before 3.0: first in auto_path is always highest priority. 234. 10/13/93 Fixed bug where Tcl_CommandComplete didn't recognize comments and treat them as such. Thus if you typed the line # { interactively, Tcl would think that the command wasn't complete and wait for more input before evaluating the script. 235. 10/14/93 Fixed bug where "regsub" didn't set the output variable if the input string was empty. 236. 10/23/93 Fixed bug where Tcl_CreatePipeline didn't close off enough file descriptors in child processes, causing children not to exit properly in some cases. 237. 10/28/93 Changed "list" and "concat" commands not to generate errors if given zero arguments, but instead to just return an empty string. ----------------- Released version 7.1, 11/4/93 ------------------ Note: there is no 7.2 release. It was flawed and was thus withdrawn shortly after it was released. 238. 11/10/93 TclMain.c didn't compile on some systems because of R_OK in call to "access". Changed to eliminate call to "access". ----------------- Released version 7.3, 11/26/93 ------------------ 239. 11/6/93 Modified "lindex", "linsert", "lrange", and "lreplace" so that "end" can be specified as an index. 240. 11/6/93 Modified "append" and "lappend" to allow only two words total (i.e., nothing to append) without generating an error. 241. 12/2/93 Changed to use EAGAIN as the errno for non-blocking I/O instead of EWOULDBLOCK: this should fix problem where non-blocking I/O didn't work correctly on System-V systems. 242. 12/22/93 Fixed bug in expressions where cancelled evaluation wasn't always working correctly (e.g. "set one 1; eval {1 || 1/$one}" failed with a divide by zero error). 243. 1/6/94 Changed TCL_VOLATILE definition from -1 to the address of a dummy procedure Tcl_Volatile, since -1 causes portability problems on some machines (e.g., Crays). 244. 2/4/94 Added support for unary plus. 245. 2/17/94 Changed Tcl_RecordAndEval and "history" command to call Tcl_GlobalEval instead of Tcl_Eval. Otherwise, invocation of these facilities in nested procedures can cause unwanted results. 246. 2/17/94 Fixed bug in tclExpr.c where an expression such as "expr {"12398712938788234-1298379" != ""}" triggers an integer overflow error for the number in quotes, even though it isn't really a proper integer anyway. 247. 2/19/94 Added new procedure Tcl_DStringGetResult to move result from interpreter to a dynamic string. 248. 2/19/94 Fixed bug in Tcl_DStringResult that caused it to overwrite the contents of a static result in some situations. This can cause bizarre errors such as variables suddenly having empty values. 249. 2/21/94 Fixed bug in Tcl_AppendElement, Tcl_DStringAppendElement, and the "lappend" command that caused improper omission of a separator space in some cases. For example, the script set x "abc{"; lappend x "def" used to return the result "abc{def" instead of "abc{ def". 250. 3/3/94 Tcl_ConvertElement was outputting empty elements as \0 if TCL_DONT_USE_BRACES was set. This depends on old pre-7.0 meaning of \0, which is no longer in effect, so it didn't really work. Changed to output empty elements as {} always. 251. 3/3/94 Renamed Tcl_DStringTrunc to Tcl_DStringSetLength and extended it so that it can be used to lengthen a string as well as shorten it. Tcl_DStringTrunc is defined as a macro for backward compatibility, but it is deprecated. 252. 3/3/94 Added Tcl_AllowExceptions procedure. 253. 3/13/94 Fixed bug in Tcl_FormatCmd that could cause "format" to mis-behave on 64-bit Big-Endian machines. 254. 3/13/94 Changed to use vfork instead of fork on systems where vfork exists. 255. 3/23/94 Fixed bug in expressions where ?: didn't associate right-to-left as they should. 256. 4/3/94 Fixed "exec" to flush any files used in >@ or >&@ redirection in exec, so that data buffered for them is written before any new data added by the subprocess. 257. 4/3/94 Added "subst" command. 258. 5/20/94 The tclsh main program is now called Tcl_Main; tclAppInit.c has a "main" procedure that calls Tcl_Main. This makes it easier to use Tcl with C++ programs, which need their own main programs, and it also allows an application to prefilter the argument list before calling Tcl_Main. *** POTENTIAL INCOMPATIBILITY *** 259. 6/6/94 Fixed bug in procedure returns where the errorInfo variable could get truncated if an unset trace was invoked as part of returning from the procedure. 260. 6/13/94 Added "wordstart" and "wordend" options to "string" command. 261. 6/27/94 Fixed bug in expressions where they didn't properly cancel the evaluation of math functions in &&, ||, and ?:. 262. 7/11/94 Incorrect boolean values, like "ogle", weren't being handled properly. 263. 7/15/94 Added Tcl_RegExpCompile, Tcl_RegExpExec, and Tcl_RegExpRange, which provide lower-level access to regular expression pattern matching. 264. 7/22/94 Fixed bug in "glob" command where "glob -nocomplain ~bad_user" would complain about a missing user. Now it doesn't complain anymore. 265. 8/4/94 Fixed bug with linked variables where they didn't behave correctly when accessed via upvars. 266. 8/17/94 Fixed bug in Tcl_EvalFile where it didn't clear interp->result. 267. 8/31/94 Modified "open" command so that errors in exec-ing subprocesses are returned by the open immediately, rather than being delayed until the "close" is executed. 268. 9/9/94 Modified "expr" command to generate errors for integer overflow (includes addition, subtraction, negation, multiplication, division). 269. 9/23/94 Modified "regsub" to return a count of the number of matches and replacements, rather than 0/1. 279. 10/4/94 Added new features to "array" command: - added "get" and "set" commands for easy conversion between arrays and lists. - added "exists" command to see if a variable is an array, changed "names" and "size" commands to treat a non-existent array (or scalar variable) just like an empty one. - added pattern option to "names" command. 280. 10/6/94 Modified Tcl_SetVar2 so that read traces on variables get called during append operations. 281. 10/20/94 Fixed bug in "read" command where reading from stdin required two control-D's to stop the reading. 282. 11/3/94 Changed "expr" command to use longs for division just like all other expr operators; it previously used ints for division. 283. 11/4/94 Fixed bugs in "unknown" procedure: it wasn't properly handling exception returns from commands that were executed after being auto-loaded. ----------------- Released version 7.4b1, 12/23/94 ------------------ 284. 12/26/94 Fixed "install" target in Makefile (couldn't always find install program). 285. 12/26/94 Added strcncasecmp procedure to compat directory. 286. 1/3/95 Fixed all procedure calls to explicitly cast arguments: implicit conversions from prototypes (especially integer->double) don't work when compiling under non-ANSI compilers. Tcl is now clean under gcc -Wconversion. 287. 1/4/95 Fixed problem in Tcl_ArrayCmd where same name was used for both a label and a variable; caused problems on several older compilers, making array command misbehave and causing many errors in Tcl test suite. ----------------- Released version 7.4b2, 1/12/95 ------------------ 288. 2/9/95 Modified Tcl_CreateCommand to return a token, and added Tcl_GetCommandName procedure. Together, these procedures make it possible to track renames of a command. 289. 2/13/95 Fixed bug in expr where "089" was interpreted as a floating-point number rather than a bogus octal number. *** POTENTIAL INCOMPATIBILITY *** 290. 2/14/95 Added code to Tcl_GetInt and Tcl_GetDouble to check for overflows when reading in numbers. 291. 2/18/95 Changed "array set" to stop after first error, rather than continuing after error. 292. 2/20/95 Upgraded to use autoconf version 2.2. 293. 2/20/95 Fixed core dump that could occur in "scan" command if a close bracket was omitted. 294. 2/27/95 Changed Makefile to always use install-sh for installations: there's just too much variation among "install" system programs, which makes installation flakey. ----------------- Released version 7.4b3, 3/24/95 ------------------ 3/25/95 (bug fix) Changed "install" to "./install" in Makefile so that "make install" will work even when "." isn't in the search path. 3/29/95 (bug fix) Fixed bug where the auto-loading mechanism wasn't protecting the values of the errorCode and errorInfo variables. 3/29/95 (new feature) Added optional pattern argument to "parray" procedure. 3/29/95 (bug fix) Made the full functionality of "return -code ... -errorcode ..." work not just inside procedures, but also in sourced files and at top level. 4/6/95 (new feature) Added "pattern" option to "array names" command. 4/18/95 (bug fix) Fixed bug in parser where it didn't allow backslash-newline immediately after an argument in braces or quotes. 4/19/95 (new feature) Added tcl_library variable, which application can set to override default library directory. 4/30/95 (bug fix) During trace callbacks for array elements, the variable name used in the original reference would be temporarily modified to separate the array name and element name; if the trace callback used the same name string, it would get the wrong name (the array name without element). Fixed to restore the variable name before making trace callbacks. 4/30/95 (new feature) Added -nobackslashes, -nocommands, and -novariables switches to "subst" command. 5/4/95 (new feature) Added TCL_EVAL_GLOBAL flag to Tcl_RecordAndEval. 5/5/95 (bug fix) Format command would overrun memory when printing integers with very large precision, as in "format %.1000d 0". 5/5/95 (portability improvement) Changed to use BSDgettimeofday on IRIX machines, to avoid compilation problems with the gettimeofday declaration. 5/6/95 (bug fix) Changed manual entries to use the standard .TH macro instead of a custom .HS macro; the .HS macro confuses index generators like makewhatis. 5/9/95 (bug fix) Modified configure script to check for Solaris bug that makes vfork unreliable (core dumps result if vforked child changes a signal handler); will use fork instead of vfork if the bug is present. 6/5/95 (bug fix) Modified "lsort" command to disallow recursive calls to lsort from a comparison function. This is needed because qsort is not reentrant. 6/5/95 (bug fix) Undid change 243 above: changed TCL_VOLATILE and TCL_DYNAMIC back to integer constants rather than procedure addresses. This was needed because procedure addresses can have multiple values under some dynamic loading systems (e.g. SunOS 4.1 and Windows). 6/8/95 (feature change) Modified interface to Tcl_Main to pass in the address of the application-specific initialization procedure. Tcl_AppInit is no longer hardwired into Tcl_Main. This is needed in order to make Tcl a shared library. 6/8/95 (feature change) Modified Makefile so that the installed versions of tclsh and libtcl.a have version number in them (e.g. tclsh7.4 and libtcl7.4.a) and the library directory name also has an embedded version number (e.g., /usr/local/lib/tcl7.4). This should make it easier for Tcl 7.4 to coexist with earlier versions. ----------------- Released version 7.4b4, 6/16/95 ------------------ 6/19/95 (bug fix) Fixed bugs in tclCkalloc.c that caused core dumps if TCL_MEM_DEBUG was enabled on word-addressed machines such as Crays. 6/21/95 (feature removal) Removed overflow checks for integer arithmetic: they just cause too much trouble (e.g. for random number generators). 6/28/95 (new features) Added tcl_patchLevel and tcl_version variables, for consistency with Tk. 6/29/95 (bug fix) Fixed problem in Tcl_Eval where it didn't record the right termination character if a script ended with a comment. This caused erroneous output for the following command, among others: puts "[ expr 1+1 # duh! ]" 6/29/95 (message change) Changed the error message for ECHILD slightly to provide a hint about why the problem is occurring. ----------------- Released version 7.4, 7/1/95 ------------------ 7/18/95 (bug fix) Changed "lreplace" so that nothing is deleted if the last index is less than the first index or if the last index is < 0. 7/18/95 (bug fix) Fixed bugs with backslashes in comments: Tcl_CommandComplete (and "info complete") didn't properly handle strings ending in backslash-newline, and neither Tcl_CommandComplete nor the Tcl parser handled other backslash sequences right, such as two backslashes before a newline. 7/19/95 (bug fix) Modified Tcl_DeleteCommand to delete the hash table entry for the command before invoking its callback. This is needed in order to deal with reentrancy. 7/22/95 (bug fix) "exec" wasn't reaping processes correctly after certain errors (e.g. if the name of the executable was bogus, as in "exec foobar"). 7/27/95 (bug fix) Makefile.in wasn't using the LIBS variable provided by the "configure" script. This caused problems on some SCO systems. 7/27/95 (bug fix) The version of strtod in fixstrtod.c didn't properly handle the case where endPtr == NULL. ----------------- Released patch 7.4p1, 7/29/95 ----------------------- 8/4/95 (bug fix) C-level trace callbacks for variables were sometimes receiving the PART1_NOT_PARSED flag, which could cause errors in subsequent Tcl library calls using the flags. (JO) 8/4/95 (bug fix) Calls to toupper and tolower weren't using the UCHAR macros, which caused trouble in non-U.S. locales. (JO) 8/10/95 (new feature) Added the "load" command for dynamic loading of binary packages, and the Tcl_PackageInitProc prototype for package initialization procedures. (JO) 8/23/95 (new features) Added "info sharedlibextension" and "info nameofexecutable" commands, plus Tcl_FindExtension procedure. (JO) 8/25/95 (bug fix) If the target of an "upvar" was non-existent but had traces set, the traces were silently lost. Change to generate an error instead. (JO) 8/25/95 (bug fix) Undid change from 7/19, so that commands can stay around while their deletion callbacks execute. Added lots of code to handle all of the reentrancy problems that this opens up. (JO) 8/25/95 (bug fix) Fixed core dump that could occur in TclDeleteVars if there was an upvar from one entry in the table to the next entry in the same table. (JO) 8/28/95 (bug fix) Exec wasn't handling bad user names properly, as in "exec ~bogus_user/foo". (JO) 8/29/95 (bug fixes) Changed backslash-newline handling to correct two problems: - Only spaces and tabs following the backslash-newline are now absorbed as part of the backslash-newline. Newlinew are no longer absorbed (add another backslash if you want to absorb another newline). - TclWordEnd returns the character just before the backslash in the sequence as the end of the sequence; it used to not consider the backslash-newline as a word separator. (JO) 8/31/95 (new feature) Changed man page installation (with "mkLinks" script) to create additional links for manual pages corresponding to each of the procedure and command names described in the pages. (JO) 9/10/95 Reorganized Tcl sources for Windows and Mac ports. All sources are now in subdirectories: "generic" contains sources that work on all platforms, "windows", "mac", and "unix" directories contain platform- specific sources. Some UNIX sources are also used on other platforms. (SS) 9/10/95 (feature change) Eliminated exported global variables (they don't work with Windows DLLs). Replaced tcl_AsyncReady and tcl_FileCloseProc with procedures Tcl_AsyncReady() and Tcl_SetFileCloseProc(). Replaced C variable tcl_RcFileName with a Tcl variable tcl_rcFileName. (SS) *** POTENTIAL INCOMPATIBILITY *** 9/11/95 (new feature) Added procedure Tcl_SetPanicProc to override the default implementation of "panic". (SS) 9/11/95 (new feature) Added "interp" command to allow creation of new interpreters and execution of untrusted scripts. Added many new procedures, such as Tcl_CreateSlave, Tcl_CreateAlias,and Tcl_MakeSafe, to provide C-level access to the interpreter facility. This mechanism now provides almost all of the generic functions of Borenstein's and Rose's Safe-Tcl (but not any Tk or email-related stuff). (JL) 9/11/95 (feature change) Changed file management so that files are no longer shared between interpreters: a file cannot normally be referenced in one interpreter if it was opened in another. This feature is needed to support safe interpreters. Added Tcl_ShareHandle() procedure for allowing files to be shared, and added "interp" argument to Tcl_FilePermissions procedure. *** POTENTIAL INCOMPATIBILITY *** 9/11/95 (new feature) Added "AssocData" mechanism, whereby extensions can associate their own data with an interpreter and get called back when the interpreter is deleted. This is visible at C level via the procedures Tcl_SetAssocData and Tcl_GetAssocData. (JL) 9/11/95 (new feature) Added Tcl_ErrnoMsg to translate an errno value into a human-readable string. This is now used instead of calling strerror because strerror mesages vary dramatically from platform to platform, which messes up Tcl tests. Tcl_ErrnoMsg uses the standard POSIX messages for all the common signals, and calls strerror for signals it doesn't understand. ----------------- Released patch 7.5p2, 9/15/95 ----------------------- ----------------- Released 7.5a1, 9/15/95 ----------------------- 9/22/95 (bug fix) Changed auto_mkindex to create tclIndex files that handle directories whose paths might contain spaces. (RJ) 9/27/95 (bug fix) The "format" command didn't check for huge or negative width specifiers, which could cause core dumps. (JO) 9/27/95 (bug fix) Core dumps could occur if an interactive command typed to tclsh returned a very long result for tclsh to print out. The bug is actually in printf (in Solaris 2.3 and 2.4, at least); switched to use puts instead. (JO) 9/28/95 (bug fix) Changed makefile.bc to eliminate a false dependency for tcl1675.dll on the Borland run time library. (SS) 9/28/95 (bug fix) Fixed tcl75.dll so it looks for tcl1675.dll instead of tcl16.dll. (SS) 9/28/95 (bug fix) Tcl was not correctly detecting the difference between Win32s and Windows '95. (SS) 9/28/95 (bug fix) "exec" was not passing environment changes to child processes under Windows. (SS) 9/28/95 (bug fix) Changed Tcl to ensure that open files are not passed to child processes under Windows. (SS) 9/28/95 (bug fix) Fixed Windows '95 and NT versions of exec so it can handle both console and windows apps. (SS) 9/28/95 (bug fix) Fixed Windows version of exec so it no longer leaves temp files lying around. Also changed it so the temp files are created in the appropriate system dependent temp directory. (SS) 9/28/95 (bug fix) Eliminated source dependency on the Win32s Universal Thunk header file, since it is not bundled with VC++. (SS) 9/28/95 (bug fix) Under Windows, Tcl now constructs the HOME environment variable from HOMEPATH and HOMEDRIVE when HOME is not already set. (SS) 9/28/95 (bug fix) Added support for "info nameofexecutable" and "info sharedlibextension" to the Windows version. (SS) 9/28/95 (bug fix) Changed tclsh to correctly parse command line arguments so that backslashes are preserved under Windows. (SS) 9/29/95 (bug fix) Tcl 7.5a1 treated either return or newline as end of line in "gets", which caused lines ending in CRLF to be treated as two separate lines. Changed to allow only character as end-of-line: carriage return on Macs, newline elsewhere. (JO) 9/29/95 (new feature) Changed to install "configInfo" file in same directory as library scripts. It didn't used to get installed. (JO) 9/29/95 (bug fix) Tcl was not converting Win32 errors into POSIX errors under some circumstances. (SS) 10/2/95 (bug fix) Safe interpreters no longer get initialized with a call to Tcl_Init(). (JL) 10/1/95 (new feature) Added "tcl_platform" global variable to provide environment information such as the instruction set and operating system. (JO) 10/1/95 (bug fix) "exec" command wasn't always generating the "child process exited abnormally" message when it should have. (JO) 10/2/95 (bug fix) Changed "mkLinks.tcl" so that the scripts it generates won't create links that overwrite original manual entries (there was a problem where pack-old.n was overwriting pack.n). (JO) 10/2/95 (feature change) Changed to use -ldl for dynamic loading under Linux if it is available, but fall back to -ldld if it isn't. (JO) 10/2/95 (bug fix) File sharing was causing refcounts to reach 0 prematurely for stdin, stdout and stderr, under some circumstances. (JL) 10/2/95 (platform support) Added support for Visual C++ compiler on Windows, Windows '95 and Windows NT, code donated by Gordon Chaffee. (JL) 10/3/95 (bug fix) Tcl now frees any libraries that it loads before it exits. (SS) 10/03/95 (bug fix) Fixed bug in Macintosh ls command where the -l and -C options would fail in anything but the HOME directory. (RJ) ----------------- Released 7.5a2, 10/6/95 ----------------------- 10/10/95 (bug fix) "file dirnam /." was returning ":" on UNIX instead of "/". (JO) 10/13/95 (bug fix) Eliminated dependency on MKS toolkit for generating the tcl.def file from Borland object files. (SS) 10/17/95 (new features) Moved the event loop from Tcl to Tk, made major revisions along the way: - New Tcl commands: after, update, vwait (replaces "tkwait variable"). - "tkerror" is now replaced with "bgerror". - The following procedures are similar to their old Tk counterparts: Tcl_DoOneEvent, Tcl_Sleep, Tcl_DoWhenIdle, Tcl_CancelIdleCall, Tcl_CreateFileHandler, Tcl_DeleteFileHandler, Tcl_CreateTimerHandler, Tcl_DeleteTimerHandler, Tcl_BackgroundError. - Revised notifier, add new concept of "event source" with the following procedures: Tcl_CreateEventSource, Tcl_DeleteEventSource, Tcl_WatchFile, Tcl_SetMaxBlockTime, Tcl_FileReady, Tcl_QueueEvent, Tcl_WaitForEvent. (JO) 10/31/95 (new features) Implemented cross platform file name support to make it easier to write cross platform scripts. Tcl now understands 4 file naming conventions: Windows (both DOS and UNC), Mac, Unix, and Network. The network convention is a new naming mechanism that can be used to paths in a platform independent fashion. See the "file" command manual page for more details. The primary interfaces changes are: - All Tcl commands that expect a file name now accept both network and native form. - Two new "file" subcommands, "nativename" and "networkname", provide a way to convert between network and native form. - Renamed Tcl_TildeSubst to Tcl_TranslateFileName, and changed it so that it always returns a filename in native form. Tcl_TildeSubst is defined as a macro for backward compatibility, but it is deprecated. (SS) 11/5/95 (new feature) Made "tkerror" and "bgerror" synonyms, so that either name can be used to manipulate the command (provides temporary backward compatibility for existing scripts that use tkerror). (JO) 11/5/95 (new feature) Added exit handlers and new C procedures Tcl_CreateExitHandler, Tcl_DeleteExitHandler, and Tcl_Exit. (JO) 11/6/95 (new feature) Added pid command for Macintosh version of Tcl (it didn't previously exist on the Mac). (RJ) 11/7/95 (new feature) New generic IO facility and support for IO to files, pipes and sockets based on a common buffering scheme. Support for asynchronous (non-blocking) IO and for event driver IO. Support for automatic (background) asynchronous flushing and asynchronous closing of channels. (JL) 11/7/95 (new feature) Added new commands "fconfigure" and "fblocked" to support new I/O features such as nonblocking I/O. Added "socket" command for creating TCP client and server sockets. (JL). 11/7/95 (new feature) Complete set of C APIs to the new generic IO facility: - Opening channels: Tcl_OpenFileChannel, Tcl_OpenCommandChannel, Tcl_OpenTcpClient, Tcl_OpenTcpServer. - I/O procedures on channels, which roughly mirror the ANSI C stdio library: Tcl_Read, Tcl_Gets, Tcl_Write, Tcl_Flush, Tcl_Seek, Tcl_Tell, Tcl_Close, Tcl_Eof, Tcl_InputBlocked, Tcl_GetChannelOption, Tcl_SetChannelOption. - Extension mechanism for creating new kinds of channels: Tcl_CreateChannel, Tcl_GetChannelInstanceData, Tcl_GetChannelType, Tcl_GetChannelName, Tcl_GetChannelFile, Tcl_RegisterChannel, Tcl_UnregisterChannel, Tcl_GetChannel. - Event-driven I/O on channels: Tcl_CreateChannelHandler, Tcl_DeleteChannelHandler. (JL) 11/7/95 (new feature) Channel driver interface specification to allow new types of channels to be added easily to Tcl. Currently being used in three drivers - for files, pipes and TCP-based sockets. (JL). 11/7/95 (new feature) interp delete now takes any number of path names of interpreters to delete, including zero. (JL). 11/8/95 (new feature) implemented 'info hostname' and Tcl_GetHostName command to get host name of machine on which the Tcl process is running. (JL) 11/9/95 (new feature) Implemented file APIs for access to low level files on each system. The APIs are: Tcl_CloseFile, Tcl_OpenFile, Tcl_ReadFile, Tcl_WriteFile and Tcl_SeekFile. Also implemented Tcl_WaitPid which waits in a system dependent manner for a child process. (JL) 11/9/95 (new feature) Added Tcl_UpdateLinkedVar procedure to force a Tcl variable to be updated after its C variable changes. (JO) 11/9/95 (bug fix) The glob command has been totally reimplemented so that it can support different file name conventions. It now handles Windows file names (both UNC and drive-relative) properly. It also supports nested braces correctly now. (SS) 11/13/95 (bug fix) Fixed Makefile.in so that configure can be run from a clean directory separate from the Tcl source tree, and compilations can be performed there. (JO) 11/14/95 (bug fix) Fixed file sharing between interpreters and file transferring between interpreters to correctly manage the refcount so that files are closed when the last reference to them is discarded. (JL) 11/14/95 (bug fix) Fixed gettimeofday implementation for the Macintosh. This fixes several timing related bugs. (RJ) 11/17/95 (new feature) Added missing support for info nameofexecutable on the Macintosh. (RJ) 11/17/95 (bug fix) The Tcl variables argc argv and argv0 now return something reasonable on the Mac. (RJ) 11/22/95 (new feature) Implemented "auto-detect" mode for end of line translations. On input, standalone "\r" mean MAC mode, standalone "\n" mean Unix mode and "\r\n" means Windows mode. On output, the mode is modified to whatever the platform specific mode for that platform is. (JL) 11/24/95 (feature change) Replaced "configInfo" file with tclConfig.sh, which is more complete and uses slightly different names. Also arranged for tclConfig.sh to be installed in the platform-specific library directory instead of Tcl's script library directory. (JO) *** POTENTIAL INCOMPATIBILITY with Tcl 7.5a2, but not with Tcl 7.4 *** ----------------- Released patch 7.4p3, 11/28/95 ----------------------- 12/5/95 (new feature) Added Tcl_File facility to support platform- independent file handles. Changed all interfaces that used Unix- style integer fd's to use Tcl_File's instead. (SS) *** POTENTIAL INCOMPATIBILITY *** 12/5/95 (new feature) Added a new "clock" command to Tcl. The command allows you to get the current "clicks" or seconds & allows you to format or scan human readable time/date strings. (RJ) 12/18/95 (new feature) Moved Tk_Preserve, Tk_Release, and Tk_EventuallyFree to Tcl, renamed to Tcl_Preserve, Tcl_Release, and Tcl_EventuallyFree. (JO) 12/18/95 (new feature) Added new "package" command and associated procedures Tcl_PkgRequire and Tcl_PkgProvide. Also wrote pkg_mkIndex library procedure to create index files from binaries and scripts. (JO) 12/20/95 (new feature) Added Tcl_WaitForFile procedure. (JO) 12/21/95 (new features) Made package name argument to "load" optional (Tcl will now attempt to guess the package name if necessary). Also added Tcl_StaticPackage and support in "load" for statically linked packages. (JO) 12/22/95 (new feature) Upgraded the foreach command to accept multiple loop variables and multiple value lists. This lets you iterate over multiple lists in parallel, and/or assign multiple loop variables from one value list during each iteration. The only potential compatibility problem is with scripts that used loop variables with a name that could be construed to be a list of variable names (i.e. contained spaces). (BW) 1/5/96 (new feature) Changed tclsh so it builds as a console mode application under Windows. Now tclsh can be used from the command line with pipes or interactively. Note that this only works under Windows 95 or NT. (SS) 1/17/96 (new feature) Modified Makefile and configure script to allow Tcl to be compiled as a shared library: use the --enable-shared option when configuing. (JO) 1/17/96 (removed obsolete features) Removed the procedures Tcl_EnterFile and Tcl_GetOpenFile: these no longer make sense with the new I/O system. (JL) *** POTENTIAL INCOMPATIBILITY *** 1/19/96 (bug fixes) Prevented formation of circular aliases, through the Tcl 'interp alias' command and through the 'rename' command, as well as through the C API Tcl_CreateAlias. (JL) 1/19/96 (bug fixes) Fixed several bugs in direct deletion of interpreters with Tcl_DeleteInterp when the interpreter is a slave; fixes based on a patch received from Viktor Dukhovni of ESM. (JL) 1/19/96 (new feature) Implemented on-close handlers for channels; added the C APIs Tcl_CreateCloseHandler and Tcl_DeleteCloseHandler. (JL) 1/19/96 (new feature) Implemented portable error reporting mechanism; added the C APIs Tcl_SetErrno and Tcl_GetErrno. (JL) 1/24/96 (bug fix) Unknown command processing properly invokes external commands under Windows NT and Windows '95 now. (SS) 1/23/96 (bug fix) Eliminated extremely long startup times under Windows '95. The problem was a result of the option database initialization code that concatenated $HOME with /.Xdefaults, resulting in a // in the middle of the file name. Under Windows '95, this is incorrectly interpreted as a UNC path. They delays came from the network timeouts needed to determine that the file name was invalid. Tcl_TranslateFileName now suppresses duplicate slashes that aren't at the beginning of the file name. (SS) 1/25/96 (bug fix) Changed exec and open to create children so they are attached to the application's console if it exists. (SS) 1/31/96 (bug fix) Fixed command line parsing to handle embedded spaces under Windows. (SS) ----------------- Released 7.5b1, 2/1/96 ----------------------- 2/7/96 (bug fix) Fixed off by one error in argument parsing code under Windows. (SS) 2/7/96 (bug fix) Fixed bugs in VC++ makefile that improperly initialized the tcl75.dll. Fixed bugs in Borland makefile that caused build failures under Windows NT. (SS) 2/9/96 (bug fix) Fixed deadlock problem in AUTO end of line translation mode which would cause a socket server with several concurrent clients writing in CRLF mode to hang. (JL) 2/9/96 (API change) Replaced -linemode option to fconfigure with a new -buffering option, added "none" setting to enable immediate write. (JL) *** INCOMPATIBILITY with b1 *** 2/9/96 (new feature) Added C API Tcl_InputBuffered which returns the count of bytes currently buffered in the input buffer of a channel, and o for output only channels. (JL) 2/9/96 (new feature) Implemented asynchronous connect for sockets. (JL) 2/9/96 (new feature) Added C API Tcl_SetDefaultTranslation to set (per channel) the default end of line translation mode. This is the mode that will be installed if an output operation is done on the channel while it is still in AUTO mode. (JL) 2/9/96 (bug fix) Changed Tcl_OpenCommandChannel interface to properly handle all of the combinations of stdio inheritance in background pipelines. See the Tcl_OpenFileChannel(3) man page for more info. This change fixes the bug where exec of a background pipeline was not getting passed the stdio handles properly. (SS) 2/9/96 (bug fix) Removed the new Tcl_CreatePipeline interface, and restored the old version for Unix platforms only. All new code should use Tcl_CreateCommandChannel instead. (SS) 2/9/96 (bug fix) Changed Makefile.in to use -L and -ltcl7.5 for Tcl library so that shared libraries are more likely to be found correctly on more platforms. (JO) 2/13/96 (new feature) Added C API Tcl_SetNotifierData and Tcl_GetNotifierData to allow notifier and channel driver writers to associate data with a Tcl_File. The result of this change is that Tcl_GetFileInfo now always returns an OS file handle, and Tcl_GetFile can be used to construct a Tcl_File for an externally constructed OS handle. (SS) 2/13/96 (bug fix) Changed Windows socket implementation so it doesn't set SO_REUSEADDR on server sockets. Now attempts to create a server socket on a port that is already in use will be properly identified and an error will be generated. (SS) 2/13/96 (bug fix) Fixed problems with DLL initialization under Visual C++ that left the C run time library uninitialized. (SS) 2/13/96 (bug fix) Fixed Windows socket initialization so it loads winsock the first time it is used, rather than at the time tcl75.dll is loaded. This should fix the bug where the modem immediately starts trying to connect to a service provider when wish or tclsh are started. (SS) 2/13/96 (new feature) Added C APIs Tcl_MakeFileChannel and Tcl_MakeTcpClientChannel to wrap up existing fds and sockets into channels. Provided implementations on Unix and Windows. (JL) 2/13/96 (bug fix) Fixed bug with seek leaving EOF and BLOCKING set. (JL) 2/14/96 (bug fix) Fixed reentrancy problem in fileevent handling and made it more robust in the face of errors. (JL) 2/14/96 (feature change) Made generic IO level emulate blocking mode if the channel driver is unable to provide it, e.g. if the low level device is always nonblocking. Thus, now blocking behavior is an advisory setting for channel drivers and can be ignored safely if the channel driver is unable to provide it. (JL) 2/15/96 (new feature) Added "binary" end of line translation mode, which is a synonym of "lf" mode. (JL) 2/15/96 (bug fix) Fixed reentrancy problem in fileevent handling vs deletion of channel event handlers. (JL) 2/15/96 (bug fix) Fixed bug in event handling which would cause a nonblocking channel to not see further readable events after the first readable event that had insufficient input. (JL) 2/17/96 (bug fix) "info complete" didn't properly handle comments in nested commands. (JO) 2/21/96 (bug fix) "exec" under Windows NT/95 did not properly handle very long command lines (>200 chars). (SS) 2/21/96 (bug fix) Sockets could get into an infinite loop if a read event arrived after all of the available data had been read. (SS) 2/22/96 (bug fix) Added cast of st_size elements to (long) before sprintf-ing in "file size" command. This is needed to handle systems like NetBSD with 64-bit file offsets. (JO) ----------------- Released 7.5b2, 2/23/96 ----------------------- 2/23/96 (bug fix) TCL_VARARGS macro in tcl.h wasn't defined properly when compiling with C++. (JO) 2/24/96 (bug fix) Removed dependencies on Makefile in the UNIX Makefile: this caused problems on some platforms (like Linux?). (JO) 2/24/96 (bug fix) Fixed configuration bug that made Tcl not compile correctly on Linux machines with neither -ldl or -ldld. (JO) 2/24/96 (new feature) Added a block of comments and definitions to Makefile.in to make it easier to have Tcl's TclSetEnv etc. replace the library procedures setenv etc, so that calls to setenv etc. in the application automatically update the Tcl "env" variable. (JO) 2/27/96 (feature change) Added optional Tcl_Interp * argument (may be NULL) to C API Tcl_Close and simplified closing of command channels. (JL) *** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 2/27/96 (feature change) Added optional Tcl_Interp * argument (may be NULL) to C type definition Tcl_DriverCloseProc; modified all channel drivers to implement close procedures that accept the additional argument. (JL) *** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 2/28/96 (bug fix) Fixed memory leak that could occur if an upvar referred to an element of an array in the same stack frame as the upvar. (JO) 2/29/96 (feature change) Modified both Tcl_DoOneEvent and Tcl_WaitForEvent so that they return immediately in cases where they would otherwise block forever (e.g. if there are no event handlers of any sort). (JO) 2/29/96 (new feature) Added C APIs Tcl_GetChannelBufferSize and Tcl_SetChannelBufferSize to set and retrieve the size, in bytes, for buffers allocated to store input or output in a channel. (JL) 2/29/96 (new feature) Added option -buffersize to Tcl fconfigure command to allow Tcl scripts to query and set the size of channel buffers. (JL) 2/29/96 (feature removed) Removed channel driver function to specify the buffer size to use when allocating a buffer. Removed the C typedef for Tcl_DriverBufferSizeProc. Channels are now created with a default buffer size of 4K. (JL) *** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 2/29/96 (feature change) The channel driver function for setting blocking mode on the device may now be NULL. If the generic code detects that the function is NULL, operations that set the blocking mode on the channel simply succeed. (JL) 3/2/96 (bug fix) Fixed core dump that could occur if a syntax error (such as missing close paren) occurred in an array reference with a very long array name. (JO) 3/4/96 (bug fix) Removed code in the "auto_load" procedure that deletes all existing auto-load information whenever the "auto_path" variable is changed. Instead, new information adds to what was already there. Otherwise, changing the "auto_path" variable causes all package- related information to be lost. If you really want to get rid of existing auto-load information, use auto_reset before setting auto_path. (JO) 3/5/96 (new feature) Added version suffix to shared library names so that Tcl will compile under NetBSD and FreeBSD (I hope). (JO) 3/6/96 (bug fix) Cleaned up error messages in new I/O system to correspond more closely to old I/O system. (JO) 3/6/96 (new feature) Added -myaddr and -myport options to the socket command, removed -tcp and -- options. This lets clients and servers choose a particular interface. Also changed the default server address from the hostname to INADDR_ANY. The server accept callback now gets passed the client's port as well as IP address. The C interfaces for Tcl_OpenTcpClient and Tcl_OpenTcpServer have changed to support the above changes. (BW) *** POTENTIAL INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 3/6/96 (changed feature) The library function auto_mkindex will now default to using the pattern "*.tcl" if no pattern is given. (RJ) 3/6/96 (bug fix) The socket channel code for the Macintosh has been rewritten to use native MacTcp. (RJ) 3/7/96 (new feature) Added Tcl_SetStdChannel and Tcl_GetStdChannel interfaces to allow applications to explicitly set and get the global standard channels. (SS) 3/7/96 (bug fix) Tcl did close not the file descriptors associated with "stdout", etc. when the corresponding channels were closed. (SS) 3/7/96 (bug fix) Reworked shared library and dynamic loading stuff to try to get it working under AIX. Added new @SHLIB_LD_LIBS@ autoconf symbol as part of this. AIX probably doesn't work yet, but it should be a lot closer. (JO) 3/7/96 (feature change) Added Tcl_ChannelProc typedef and changed the signature of Tcl_CreateChannelHandler and Tcl_DeleteChannelHandler to take Tcl_ChannelProc arguments instead of Tcl_FileProc arguments. This change should not affect any code outside Tcl because the signatures of Tcl_ChannelProc and Tcl_FileProc are compatible. (JL) 3/7/96 (API change) Modified signature of Tcl_GetChannelOption to return an int instead of char *, and to take a Tcl_DString * argument. Modified the implementation so that the option name can be NULL, to mean that the call should retrieve a list of alternating option names and values. (JL) *** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 3/7/96 (API change) Added Tcl_DriverSetOptionProc, Tcl_DriverGetOptionProc typedefs, added two slots setOptionProc and getOptionProc to the channel type structure. These may be NULL to indicate that the channel type does not support any options. (JL) *** INCOMPATIBILITY with Tcl 7.5b2, but not with Tcl 7.4 *** 3/7/96 (feature change) stdin, stdout and stderr can now be put into nonblocking mode. (JL) 3/8/96 (feature change) Eliminated dependence on the registry for finding the Tcl library files. (SS) ----------------- Released 7.5b3, 3/8/96 ----------------------- 3/12/96 (feature improvement) Modified startup script to look in several different places for the Tcl library directory. This should allow Tcl to find the libraries under all but the weirdest conditions, even without the TCL_LIBRARY environment variable being set. (JO) 3/13/96 (bug fix) Eliminated use of the "linger" option from the Windows socket implementation. (JL) 3/13/96 (new feature) Added -peername and -sockname options for fconfigure for socket channels. Code contributed by John Haxby of HP. (JL) 3/13/96 (bug fix) Fixed panic and core dump that would occur if the accept callback script on a server socket encountered an error. (JL) 3/13/96 (feature change) Added -async option to the Tcl socket command. If the command is creating a client socket and the flag is present, the client is connected asynchronously. If the option is absent (the default), the client socket is connected synchronously, and the command returns only when the connection has been completed or failed. This change was suggested by Mark Diekhans. (JL) 3/13/96 (feature change) Modified the signature of Tcl_OpenTcpClient to take an additional int argument, async. If nonzero, the client is connected to the server asynchronously. If the value is zero, the connection is made synchronously, and the call to Tcl_OpenTcpClient returns only when the connection fails or succeeds. This change was suggested by Mark Diekhans. (JL) *** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 *** 3/14/96 (bug fix) "tclsh bogus_file_name" didn't print an error message. (JO) 3/14/96 (bug fix) Added new procedures to tclCkalloc.c so that libraries and applications can be compiled with TCL_MEM_DEBUG even if Tcl isn't (however, the converse is still not true). Patches provided by Jan Nijtmans. (JO) 3/15/96 (bug fix) Marked standard IO handles of a process as close-on-exec to fix bug in Ultrix where exec was not sharing standard IO handles with subprocesses. Fix suggested by Mark Diekhans. (JL) 3/15/96 (bug fix) Fixed asynchronous close mechanism so that it closes the channel instead of leaking system resources. The manifestation was that Tcl would eventually run out of file descriptors if it was handling a large number of nonblocking sockets or pipes with high congestion. (JL) 3/15/96 (bug fix) Fixed tests so that they no longer leak file descriptors. The manifestation was that Tcl would eventually run out of file descriptors if the tests were rerun many times (> a hundred times on Solaris). (JL) 3/15/96 (bug fix) Fixed channel creation code so that it never creates unnamed channels. This would cause a panic and core dump when the channel was closed. (JL) 3/16/96 (bug fixes) Made lots of changes in configuration stuff to get Tcl working under AIX (finally). Tcl should now support the "load" command under AIX and should work either with or without shared libraries for Tcl and Tk. (JO) 3/21/96 (configuration improvement) Changed configure script so it doesn't use version numbers (as in -ltcl7.5 and libtcl7.5.so) under SunOS 4.1, where they don't work anyway. (JO) 3/22/96 (new feature) Added C API Tcl_InterpDeleted that allows extension writers to discover when an interpreter is being deleted. (JL) 3/22/96 (bug fix) The standard IO channels are now added to each trusted interpreter as soon as the interpreter is created. This ensures against the bug where a child would do IO before the master had done any, and then the child is destroyed - the standard IO channels would be then closed and the master would be unable to do any IO. (JL) 3/22/96 (bug fix) Made Tcl more robust against interpreter deletion, by using Tcl_Preserve, Tcl_Release and Tcl_EventuallyFree to split the process of interpreter deletion into two distinct phases. Also went through all of Tcl and added calls to Tcl_Preserve and Tcl_Delete where needed. (JL) 3/22/96 (bug fix) Fixed several places where C code was reading and writing into freed memory, especially during interpreter deletion. (JL) 3/22/96 (bug fix) Fixed very deep bug in Tcl_Release that caused memory to be freed twice if the release callback did Tcl_Preserve and Tcl_Release on the same memory as the chunk currently being freed. (JL) 3/22/96 (bug fix) Removed several memory leaks that would cause memory buildup on half-K chunks in the generic IO level. (JL) 3/22/96 (bug fix) Fixed several core dumps which occurred when new AssocData was being created during the cleanups in interpreter deletion. The solution implemented now is to loop repeatedly over the AssocData until none is left to clean up. (JL) 3/22/96 (bug fix) Fixed a bug in event handling which caused an infinite loop if there were no files being watched and no timer. Fix suggested by Jan Nijtmans. (JL) 3/22/96 (bug fix) Fixed Tcl_CreateCommand, Tcl_DeleteCommand to be more robust if the interpreter is being deleted. Also fixed several order dependency bugs in Tcl_DeleteCommand which kicked in when an interpreter was being deleted. (JL) 3/26/96 (bug fix) Upon a "short read", the generic code no longer calls the driver for more input. Doing this caused blocking on some platforms even on nonblocking channels. Bug and fix courtesy Mark Roseman. (JL) 3/26/96 (new feature) Added 'package Tcltest' which is present only in test versions of Tcl; this allows the testing commands to be loaded into new interpreters besides the main one. (JL) 3/26/96 (restored feature) Recreated the Tcl_GetOpenFile C API. You can now get a FILE * from a registered channel; Unix only. (JL) 3/27/96 (bug fix) The regular expression code did not support more than 9 subexpressions. It now supports up to 20. (SS) 4/1/96 (bug fixes) The CHANNEL_BLOCKED bit was being left on on a short read, so that fileevents wouldn't fire correctly. Bug reported by Mark Roseman.(JL, RJ) 4/1/96 (bug fix) Moved Tcl_Release to match Tcl_Preserve exactly, in tclInterp.c; previously interpreters were being freed only conditionally and sometimes not at all. (JL) 4/1/96 (bug fix) Fixed error reporting in slave interpreters when the error message was being generated directly by C code. Fix suggested by Viktor Dukhovni of ESM. (JL) 4/2/96 (bug fixes) Fixed a series of bugs in Windows sockets that caused events to variously get lost, to get sent multiple times, or to be ignored by the driver. The manifestation was blocking if the channel is blocking, and either getting EAGAIN or infinite loops if the channel is nonblocking. This series of bugs was found by Ian Wallis of Cisco. Now all tests (also those that were previously commented out) in socket.test pass. (JL, SS) 4/2/96 (feature change/bug fix) Eliminated network name support in favor of better native name support. Added "file split", "file join", and "file pathtype" commands. See the "file" man page for more details. (SS) *** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 *** 4/2/96 (bug fix) Changed implementation of auto_mkindex so tclIndex files will properly handle path names in a cross platform context. (SS) 4/5/96 (bug fix) Fixed Tcl_ReadCmd to use the channel buffer size as the chunk size it reads, instead of a fixed 4K size. Thus, on large reads, the user can set the channel buffer size to a large size and the read will occur orders of magnitude faster. For example, on a 2MB file, reading in 4K chunks took 34 seconds, while reading in 1MB chunks took 1.5 seconds (on a SS-20). Problem identified and fix suggested by John Haxby of HP. (JL) 4/5/96 (bug fix) Fixed socket creation code to invoke gethostbyname only if inet_addr failed (very unlikely). Before this change the order was reversed and this made things much slower than they needed to be (gethostbyname generally requires an RPC, which is slow). Problem identified and fix suggested by John Loverso of OSF. (JL) 4/9/96 (feature change) Modified "auto" translation mode so that it recognizes any of "\n", "\r" and "\r\n" in input as end of line, so that a file can have mixed end-of-line sequences. It now outputs the platform specific end of line sequence on each platform for files and pipes, and for sockets it produces crlf in output on all platforms. (JL) *** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 *** 4/11/96 (new feature) Added -eofchar option to Tcl_SetChannelOption to allow setting of an end of file character for input and output. If an input eof char is set, it is recognized as EOF and further input from the channel is not presented to the caller. If an output eof char is set, on output, that byte is appended to the channel when it is closed. On Unix and Macintosh, all channels start with no eof char set for input or output. On Windows, files and pipes start with input and output eof chars set to Crlt-Z (ascii 26), and sockets start with no input or output eof char. (JL) *** INCOMPATIBILITY with Tcl 7.5b3, but not with Tcl 7.4 *** 4/17/96 (bug fix) Fixed series of bugs with handling of crlf sequence split across buffer boundaries in input, in AUTO mode. (JL, BW) 4/17/96 (test suite improvement) Fixed test suite so that tests that depend on the availability of Unix commands such as echo, cat and others are not run if these commands are not present. (JL) 4/17/96 (test suite improvement) The socket test now automatically starts, on platformst that support exec, a separate process for remote testsing. (JL) ----------------- Released 7.5, 4/21/96 ----------------------- 5/1/96 (bug fix) "file tail ~" did not correctly return the tail portion of the user's home directory. (SS) 5/1/96 (bug fix) Fixed bug in TclGetEnv where it didn't lookup environment variables correctly: could confuse "H" and "HOME", for example. (JO) 5/1/96 (bug fix) Changed to install tclConfig.sh under "make install-binaries", not "make install-libraries". (JO) 5/2/96 (bug fix) Changed pkg_mkIndex not to attempt to "load" a file unless it has the standard shared library extension. On SunOS, attempts to load Tcl scripts cause the whole application to be aborted (there's no way to get the error back into Tcl). (JO) 5/7/96 (bug fix) Moved initScript in tclUnixInit.c to writable memory to avoid potential core dumps. (JO) 5/7/96 (bug fix) Auto_reset procedure was removing procedure from init.tcl, such as pkg_mkIndex. (JO) 5/7/96 (bug fix) Fixed cast on socket address resolution code that would cause a failure to connect on Dec Alphas. (JL) 5/7/96 (bug fix) Added "time", "subst" and "fileevent" commands to set of commands available in a safe interpreter. (JL) 5/13/96 (bug fix) Preventing OS level handles for stdin, stdout and stderr from being implicitly closed when the last reference to the standard channel containing that handle is discarded when an interpreter is deleted. Explicitly closing standard channels by using "close" still works. (JL) 5/21/96 (bug fix) Do not create channels for stdin, stdout and stderr on Unix if the devices are closed. This prevents a duplicate channel name panic later on when the fd is used to open a channel and the channel is registered in an interpreter. (JL) 5/23/96 (bug fix) Fixed bug that prevented the use of standard channels in interpreters created after the last interpreter was destroyed. In the sequence interp = Tcl_CreateInterp(); Tcl_DeleteInterp(interp); interp = Tcl_CreateInterp(); channels for stdio would not be available in the second interpreter. (JL) 5/23/96 (bug fix) Fixed bug that allowed Tcl_MakeFileChannel to create new channels with Tcl_Files in them that are already used by another channel. This would cause core dumps when the Tcl_Files were being freed twice. (JL) 5/23/96 (bug fix) Fixed a logical timing bug that caused a standard channel to be removed from the standard channel table too early when the channel was being closed. If the channel was being flushed asynchronously, it could get recreated before being actually destroyed, and the recreated channel would contain the same Tcl_File as the one being closed, leading to dangling pointers and core dumps. (JL) 5/27/96 (bug fix) Fixed a bug in Tcl_GetChannelOption which caused it to always return a list of one element, a list of the settings, for -translation and -eofchar options. Now correctly returns the value described by the documentation (Mark Diekhans found this, thanks!). (JL) 5/30/96 (bug fix) Fixed a couple of syntax errors in io.test. (JL) 5/30/96 (bug fix) If a fileevent scripts gets an error, delete it before causing a background error. This is to allow the error handler to reinstall the fileevent and to prevent infinite loops if the event loop is reentered in the error handler. (JL) 5/31/96 (bug fix) Channels now will get properly flushed on exit. (JL) 6/5/96 (bug fix) Changed Tcl_Ckalloc, Tcl_Ckfree, and Tcl_Ckrealloc to Tcl_Alloc, Tcl_Free, and Tcl_Realloc. Added documentation for these routines now that they are officially supported. Extension writers should use these routines instead of free() and malloc(). (SS) 6/10/96 (bug fix) Changes the Tcl close command so that it no longer waits on nonblocking pipes for the piped processes to exit; instead it reaps them in the background. (JL) 6/11/96 (bug fix) Increased the length of the listen queue for server sockets on Unix from 5 to 100. Some OSes will disregard this and reset it to 5, but we should try to get as long a queue as we can, for performance reasons. (JL) 6/11/96 (bug fix) Fixed windows sockets bug that caused a cascade of events if the fileevent script read less than was available. Now reading less than is available does not cause a flood of Tcl events. (JL, SS) 6/11/96 (bug fix) Fixed bug in background flushing on closed channels that would prevent the last buffer from getting flushed. (JL) 6/13/96 (bug fix) Fixed bug in Windows sockets that caused a core dump if a DLL linked with tcl.dll and referred to e.g. ntohs() without opening a Tcl socket. The problem was that the indirection table was not being initialized. (JL) 6/13/96 (bug fix) Fixed OS level resource leak that would occur when a Tcl channel was still registered in some interpreter when the process exits. Previously the channel was not being closed and the OS level handles were not being released; the output was being flushed but the device was not being closed. Now the device is properly closed. This was only a problem on Win3.1 and MacOS. (JL, SS) 6/28/96 (bug fix) Fixed bug where transient errors were leaving an error code around, so that it would erroneously get reported later. This bug was exercised intermittently by closing a channel to a file on a very loaded NFS server, or to a socket whose other end blocked. (JL, BW) 7/3/96 (bug fix) Fileevents declared in an interpreter are now deleted when the channel is closed in that interpreter. Before this fix, the fileevent would hang around until the channel is completely closed, and would cause errors if events happened before the channel was closed. This could happen in two cases: first if the channel is shared between several interpreters, and second if an async flush is in progress that prevents the channel from being closed until the flush finishes. (JL) 7/10/96 (bug fix) Fixed bugs in both "lrange" and "lreplace" commands where too much white space was being removed. For example, the command lreplace {\}\ hello} end end was returning "\}\", losing the significant space in the first list element and corrupting the list. (JO) 7/20/96 (bug fix) The procedure pkg_mkIndex didn't work properly for extensions that depend on Tk, because it didn't load Tk into the child interpreter before loading the extension. Now it loads Tk if Tk is present in the parent. (JO) 7/23/96 (bug fix) Added compat version of strftime to fix crashes resulting from bad implementations under Windows. (SS) 7/23/96 (bug fix) Standard implementations of gmtime() and localtime() under Windows did not handle dates before 1970, so they were replaced with a revised implementation. (SS) 7/23/96 (bug fix) Tcl would crash on exit under Borland 5.0 because the global environ pointer was left pointing to freed memory. (SS) 7/29/96 (bug fix) Fixed memory leak in Tcl_LoadCmd that could occur if a package's AppInit procedure called Tcl_StaticPackage to register static packages. (JO) 8/1/96 (bug fix) Fixed a series of bugs in Windows sockets so that async writebehind in the presence of read event handlers now works, and so that async writebehind also works on sockets for which a read event handler was declared and whose channels were then closed before the async write finished. The bug was reported by John Loverso and Steven Wahl, independently, test case supplied by John Loverso. (JL) ----------------- Released patch 7.5p1, 8/2/96 -----------------------