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authorRob Landley <rob@landley.net>2016-03-20 20:39:27 -0500
committerRob Landley <rob@landley.net>2016-03-20 20:39:27 -0500
commit6aba814b28cddd45c7301c39dccd65b316eb5c82 (patch)
treeb9061ca0c52407c3d8c18f80e521e1dd4db3357c /toys/pending
parent4de04e83d7ff621062b8b5456a14f2f313a2639c (diff)
downloadtoybox-6aba814b28cddd45c7301c39dccd65b316eb5c82.tar.gz
Posix requires "" to be false, and 00 should be false, and -0 should be false.
Fix memory leaks in regex. Simplify regex check (if we matched, subexpression had to match). Don't exit() from a command, set exitval and return.
Diffstat (limited to 'toys/pending')
-rw-r--r--toys/pending/expr.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/toys/pending/expr.c b/toys/pending/expr.c
index 25aa3cd6..743a9536 100644
--- a/toys/pending/expr.c
+++ b/toys/pending/expr.c
@@ -58,6 +58,8 @@ config EXPR
GLOBALS(
char **tok; // current token, not on the stack since recursive calls mutate it
+
+ char *refree;
)
// Scalar value. If s != NULL, it's a string, otherwise it's an int.
@@ -97,8 +99,7 @@ void assign_int(struct value *v, long long i)
// Check if v is 0 or the empty string.
static int is_false(struct value *v)
{
- if (v->s) return !*v->s || !strcmp(v->s, "0"); // get_int("0") -> 0
- return !v->i;
+ return get_int(v, &v->i) && !v->i;
}
// 'ret' is filled with a string capture or int match position.
@@ -108,16 +109,19 @@ static void re(char *target, char *pattern, struct value *ret)
regmatch_t m[2];
xregcomp(&pat, pattern, 0);
- if (!regexec(&pat, target, 2, m, 0) && m[0].rm_so == 0) { // match at pos 0
- regmatch_t *g1 = &m[1]; // group capture 1
- if (pat.re_nsub > 0 && g1->rm_so >= 0) // has capture
- ret->s = xmprintf("%.*s", g1->rm_eo - g1->rm_so, target + g1->rm_so);
- else assign_int(ret, m[0].rm_eo);
- } else { // no match
- // has capture
- if (pat.re_nsub > 0) ret->s = "";
+ // must match at pos 0
+ if (!regexec(&pat, target, 2, m, 0) && !m[0].rm_so) {
+ // Return first parenthesized subexpression as string, or length of match
+ if (pat.re_nsub>0) {
+ ret->s = xmprintf("%.*s", m[1].rm_eo-m[1].rm_so, target+m[1].rm_so);
+ if (TT.refree) free(TT.refree);
+ TT.refree = ret->s;
+ } else assign_int(ret, m[0].rm_eo);
+ } else {
+ if (pat.re_nsub>0) ret->s = "";
else assign_int(ret, 0);
}
+ regfree(&pat);
}
// 4 different signatures of operators. S = string, I = int, SI = string or
@@ -250,5 +254,7 @@ void expr_main(void)
if (ret.s) printf("%s\n", ret.s);
else printf("%lld\n", ret.i);
- exit(is_false(&ret));
+ toys.exitval = is_false(&ret);
+
+ if (TT.refree) free(TT.refree);
}