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authorLiubov Dmitrieva <liubov.dmitrieva@gmail.com>2011-10-23 13:34:15 -0400
committerUlrich Drepper <drepper@gmail.com>2011-10-23 13:34:15 -0400
commit95584d3b3309ff4da4cc458254df383f5cff044b (patch)
tree2b8c9a0284e2b33c15b1d7cc48ef6e72d1a9207e /string
parent774a2669af652979ed965d7225502ba473b2da73 (diff)
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Fix signedness in wcscmp comparison
Diffstat (limited to 'string')
-rw-r--r--string/test-strcmp.c89
1 files changed, 75 insertions, 14 deletions
diff --git a/string/test-strcmp.c b/string/test-strcmp.c
index b8d85dc..0e43f85 100644
--- a/string/test-strcmp.c
+++ b/string/test-strcmp.c
@@ -1,4 +1,4 @@
-/* Test and measure STRCMP functions.
+/* Test and measure strcmp and wcscmp functions.
Copyright (C) 1999, 2002, 2003, 2005, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Written by Jakub Jelinek <jakub@redhat.com>, 1999.
@@ -23,7 +23,6 @@
#include "test-string.h"
#ifdef WIDE
-# include <inttypes.h>
# include <wchar.h>
# define L(str) L##str
@@ -34,12 +33,53 @@
# define SIMPLE_STRCMP simple_wcscmp
# define STUPID_STRCMP stupid_wcscmp
# define CHAR wchar_t
-# define UCHAR uint32_t
+# define UCHAR wchar_t
# define CHARBYTES 4
# define CHARBYTESLOG 2
# define CHARALIGN __alignof__ (CHAR)
# define MIDCHAR 0x7fffffff
# define LARGECHAR 0xfffffffe
+# define CHAR__MAX WCHAR_MAX
+# define CHAR__MIN WCHAR_MIN
+
+/* Wcscmp uses signed semantics for comparison, not unsigned */
+/* Avoid using substraction since possible overflow */
+
+int
+simple_wcscmp (const wchar_t *s1, const wchar_t *s2)
+{
+ wchar_t c1, c2;
+ do
+ {
+ c1 = *s1++;
+ c2 = *s2++;
+ if (c2 == L'\0')
+ return c1 - c2;
+ }
+ while (c1 == c2);
+
+ return c1 < c2 ? -1 : 1;
+}
+
+int
+stupid_wcscmp (const wchar_t *s1, const wchar_t *s2)
+{
+ size_t ns1 = wcslen (s1) + 1;
+ size_t ns2 = wcslen (s2) + 1;
+ size_t n = ns1 < ns2 ? ns1 : ns2;
+ int ret = 0;
+
+ wchar_t c1, c2;
+
+ while (n--) {
+ c1 = *s1++;
+ c2 = *s2++;
+ if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0)
+ break;
+ }
+ return ret;
+}
+
#else
# define L(str) str
# define STRCMP strcmp
@@ -55,31 +95,35 @@
# define CHARALIGN 1
# define MIDCHAR 0x7f
# define LARGECHAR 0xfe
-#endif
-typedef int (*proto_t) (const CHAR *, const CHAR *);
+# define CHAR__MAX CHAR_MAX
+# define CHAR__MIN CHAR_MIN
+/* Strcmp uses unsigned semantics for comparison. */
int
-SIMPLE_STRCMP (const CHAR *s1, const CHAR *s2)
+simple_strcmp (const char *s1, const char *s2)
{
int ret;
- while ((ret = *(UCHAR *) s1 - *(UCHAR *) s2++) == 0 && *s1++);
+ while ((ret = *(unsigned char *) s1 - *(unsigned char*) s2++) == 0 && *s1++);
return ret;
}
int
-STUPID_STRCMP (const CHAR *s1, const CHAR *s2)
+stupid_strcmp (const char *s1, const char *s2)
{
- size_t ns1 = STRLEN (s1) + 1;
- size_t ns2 = STRLEN (s2) + 1;
+ size_t ns1 = strlen (s1) + 1;
+ size_t ns2 = strlen (s2) + 1;
size_t n = ns1 < ns2 ? ns1 : ns2;
int ret = 0;
while (n--)
- if ((ret = *(UCHAR *) s1++ - *(UCHAR *) s2++) != 0)
+ if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0)
break;
return ret;
}
+#endif
+
+typedef int (*proto_t) (const CHAR *, const CHAR *);
IMPL (STUPID_STRCMP, 1)
IMPL (SIMPLE_STRCMP, 1)
@@ -276,14 +320,31 @@ check (void)
STRCPY(s1, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrs"));
STRCPY(s2, L("abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijkLMNOPQRSTUV"));
+ /* Check correct working for negatives values */
+
+ s1[0] = 1;
+ s2[0] = 1;
+ s1[1] = 1;
+ s2[1] = 1;
+ s1[2] = -1;
+ s2[2] = 3;
+ s1[3] = 0;
+ s2[3] = -1;
+
+ /* Check possible overflow bug, actual more for wcscmp */
+
+ s1[7] = CHAR__MIN;
+ s2[7] = CHAR__MAX;
+
size_t l1 = STRLEN (s1);
size_t l2 = STRLEN (s2);
+
for (size_t i1 = 0; i1 < l1; i1++)
for (size_t i2 = 0; i2 < l2; i2++)
{
- int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2);
- FOR_EACH_IMPL (impl, 0)
- check_result (impl, s1 + i1, s2 + i2, exp_result);
+ int exp_result = SIMPLE_STRCMP (s1 + i1, s2 + i2);
+ FOR_EACH_IMPL (impl, 0)
+ check_result (impl, s1 + i1, s2 + i2, exp_result);
}
}