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• fix check for empty pattern in ${foo/bar/baz} expansion: the

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character anchoring the pattern (‘#’ or ‘%’) must be skipped
  if one was used; fixes “BLA="#test"; echo "${BLA//#/}"” busy
  looping (due to null pattern) found by Jb_boin
This commit is contained in:
tg 2011-03-17 21:57:50 +00:00
parent 5239e8ea4c
commit d07bacd44a
1 changed files with 37 additions and 4 deletions
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41
eval.c
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@ -22,7 +22,7 @@
#include "sh.h" #include "sh.h"
__RCSID("$MirOS: src/bin/mksh/eval.c,v 1.101 2011/03/16 20:31:33 tg Exp $"); __RCSID("$MirOS: src/bin/mksh/eval.c,v 1.102 2011/03/17 21:57:50 tg Exp $");
/* /*
* string expansion * string expansion
@ -464,12 +464,44 @@ expand(const char *cp, /* input word */
*d = '\0'; *d = '\0';
afree(tpat0, ATEMP); afree(tpat0, ATEMP);
/* reject empty pattern */ /* check for special cases */
if (!*pat || gmatchx("", pat, false)) d = str_val(st->var);
switch (*pat) {
case '#':
/* anchor at begin */
tpat0 = pat + 1;
tpat1 = rrep;
tpat2 = d;
break;
case '%':
/* anchor at end */
tpat0 = pat + 1;
tpat1 = d;
tpat2 = rrep;
break;
case '\0':
/* empty pattern */
goto no_repl; goto no_repl;
default:
tpat0 = pat;
/* silence gcc */
tpat1 = tpat2 = NULL;
}
if (gmatchx(null, tpat0, false)) {
/*
* pattern matches
* the empty string
*/
if (tpat0 == pat)
goto no_repl;
/* but is anchored */
s = shf_smprintf("%s%s",
tpat1, tpat2);
goto do_repl;
}
/* prepare string on which to work */ /* prepare string on which to work */
strdupx(s, str_val(st->var), ATEMP); strdupx(s, d, ATEMP);
sbeg = s; sbeg = s;
/* first see if we have any match at all */ /* first see if we have any match at all */
@ -527,6 +559,7 @@ expand(const char *cp, /* input word */
goto again_repl; goto again_repl;
end_repl: end_repl:
afree(tpat1, ATEMP); afree(tpat1, ATEMP);
do_repl:
x.str = s; x.str = s;
no_repl: no_repl:
afree(pat, ATEMP); afree(pat, ATEMP);