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expr: a bit more robust handling of regexps with groups (closes bug 87)

This commit is contained in:
Denis Vlasenko 2009-03-03 14:27:36 +00:00
parent 6852effbc2
commit 230997bd61
1 changed files with 6 additions and 6 deletions
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12
coreutils/expr.c
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@ -223,13 +223,13 @@ static VALUE *docolon(VALUE *sv, VALUE *pv)
tostring(pv);
if (pv->u.s[0] == '^') {
bb_error_msg("\
warning: unportable BRE: `%s': using `^' as the first character\n\
of a basic regular expression is not portable; it is being ignored", pv->u.s);
bb_error_msg(
"warning: '%s': using '^' as the first character\n"
"of a basic regular expression is not portable; it is ignored", pv->u.s);
}
memset(&re_buffer, 0, sizeof(re_buffer));
memset(re_regs, 0, sizeof(*re_regs));
memset(re_regs, 0, sizeof(re_regs));
xregcomp(&re_buffer, pv->u.s, 0);
/* expr uses an anchored pattern match, so check that there was a
@ -238,7 +238,7 @@ of a basic regular expression is not portable; it is being ignored", pv->u.s);
&& re_regs[0].rm_so == 0
) {
/* Were \(...\) used? */
if (re_buffer.re_nsub > 0) {
if (re_buffer.re_nsub > 0 && re_regs[1].rm_so >= 0) {
sv->u.s[re_regs[1].rm_eo] = '\0';
v = str_value(sv->u.s + re_regs[1].rm_so);
} else {
@ -251,7 +251,7 @@ of a basic regular expression is not portable; it is being ignored", pv->u.s);
else
v = int_value(0);
}
//FIXME: sounds like here is a bit missing: regfree(&re_buffer);
regfree(&re_buffer);
return v;
}