From f19817ddc2f2162803b19448ea2b23b1209911dd Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Fri, 18 Jul 2008 18:17:10 +0000
Subject: libbb: fix bb_strtol[l]'s check for "-". Hopefully closes bug 4174
function old new delta
bb_strtol 82 85 +3
handle_errors 75 66 -9
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 3/-9) Total: -6 bytes
---
libbb/bb_strtonum.c | 30 ++++++++++++++++++++++--------
1 file changed, 22 insertions(+), 8 deletions(-)
(limited to 'libbb')
diff --git a/libbb/bb_strtonum.c b/libbb/bb_strtonum.c
index 2433f1f1f..4a0da0ae0 100644
--- a/libbb/bb_strtonum.c
+++ b/libbb/bb_strtonum.c
@@ -18,6 +18,16 @@
* errno = ERANGE if value is out of range, missing, etc.
* errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok )
* return value is all-ones in this case.
+ *
+ * Test code:
+ * char *endptr;
+ * const char *minus = "-";
+ * errno = 0;
+ * bb_strtoi(minus, &endptr, 0); // must set ERANGE
+ * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL);
+ * errno = 0;
+ * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-'
+ * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL);
*/
static unsigned long long ret_ERANGE(void)
@@ -38,11 +48,6 @@ static unsigned long long handle_errors(unsigned long long v, char **endp, char
/* good number, just suspicious terminator */
errno = EINVAL;
}
- /* Check for the weird "feature":
- * a "-" string is apparently a valid "number" for strto[u]l[l]!
- * It returns zero and errno is 0! :( */
- if (endptr[-1] == '-')
- return ret_ERANGE();
return v;
}
@@ -67,7 +72,12 @@ long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
unsigned long long v;
char *endptr;
- if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
+ /* Check for the weird "feature":
+ * a "-" string is apparently a valid "number" for strto[u]l[l]!
+ * It returns zero and errno is 0! :( */
+ char first = (arg[0] != '-' ? arg[0] : arg[1]);
+ if (!isalnum(first)) return ret_ERANGE();
+
errno = 0;
v = strtoll(arg, &endptr, base);
return handle_errors(v, endp, endptr);
@@ -90,7 +100,9 @@ long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
long v;
char *endptr;
- if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
+ char first = (arg[0] != '-' ? arg[0] : arg[1]);
+ if (!isalnum(first)) return ret_ERANGE();
+
errno = 0;
v = strtol(arg, &endptr, base);
return handle_errors(v, endp, endptr);
@@ -115,7 +127,9 @@ int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
long v;
char *endptr;
- if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE();
+ char first = (arg[0] != '-' ? arg[0] : arg[1]);
+ if (!isalnum(first)) return ret_ERANGE();
+
errno = 0;
v = strtol(arg, &endptr, base);
if (v > INT_MAX) return ret_ERANGE();
--
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