diff options
Diffstat (limited to 'generic')
| -rw-r--r-- | generic/tclCmdMZ.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/generic/tclCmdMZ.c b/generic/tclCmdMZ.c index 5a1751e..2086335 100644 --- a/generic/tclCmdMZ.c +++ b/generic/tclCmdMZ.c @@ -14,7 +14,7 @@ * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * - * RCS: @(#) $Id: tclCmdMZ.c,v 1.82.2.4 2003/05/10 23:55:08 hobbs Exp $ + * RCS: @(#) $Id: tclCmdMZ.c,v 1.82.2.5 2003/06/17 20:42:37 vincentdarley Exp $ */ #include "tclInt.h" @@ -368,7 +368,10 @@ Tcl_RegexpObjCmd(dummy, interp, objc, objv) while (1) { match = Tcl_RegExpExecObj(interp, regExpr, objPtr, - offset /* offset */, numMatchesSaved, eflags); + offset /* offset */, numMatchesSaved, eflags + | ((offset > 0 && + (Tcl_GetUniChar(objPtr,offset-1) != (Tcl_UniChar)'\n')) + ? TCL_REG_NOTBOL : 0)); if (match < 0) { return TCL_ERROR; @@ -719,11 +722,14 @@ Tcl_RegsubObjCmd(dummy, interp, objc, objv) * The following loop is to handle multiple matches within the * same source string; each iteration handles one match and its * corresponding substitution. If "-all" hasn't been specified - * then the loop body only gets executed once. + * then the loop body only gets executed once. We must use + * 'offset <= wlen' in particular for the case where the regexp + * pattern can match the empty string - this is useful when + * doing, say, 'regsub -- ^ $str ...' when $str might be empty. */ numMatches = 0; - for ( ; offset < wlen; ) { + for ( ; offset <= wlen; ) { /* * The flags argument is set if string is part of a larger string, @@ -731,7 +737,9 @@ Tcl_RegsubObjCmd(dummy, interp, objc, objv) */ match = Tcl_RegExpExecObj(interp, regExpr, objPtr, offset, - 10 /* matches */, ((offset > 0) ? TCL_REG_NOTBOL : 0)); + 10 /* matches */, ((offset > 0 && + (Tcl_GetUniChar(objPtr,offset-1) != (Tcl_UniChar)'\n')) + ? TCL_REG_NOTBOL : 0)); if (match < 0) { result = TCL_ERROR; @@ -819,7 +827,9 @@ Tcl_RegsubObjCmd(dummy, interp, objc, objv) * in order to prevent infinite loops. */ - Tcl_AppendUnicodeToObj(resultPtr, wstring + offset, 1); + if (offset < wlen) { + Tcl_AppendUnicodeToObj(resultPtr, wstring + offset, 1); + } offset++; } else { offset += end; |