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Only use strncmp optimization if count argument is constant.

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This commit is contained in:
Ulrich Drepper 1999-02-16 21:21:52 +00:00
parent 6686d05a25
commit d30da2a800
1 changed files with 7 additions and 6 deletions
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13
string/bits/string2.h
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@ -687,12 +687,13 @@ __stpcpy_small (char *__dest,
/* Compare N characters of S1 and S2. */
#ifndef _HAVE_STRING_ARCH_strncmp
# define strncmp(s1, s2, n) \
(__extension__ (__builtin_constant_p (s1) && strlen (s1) < ((size_t) (n)) \
? strcmp (s1, s2) \
: (__builtin_constant_p (s2) && strlen (s2) < ((size_t) (n))\
? strcmp (s1, s2) \
: strncmp (s1, s2, n))))
# define strncmp(s1, s2, n) \
(__extension__ (__builtin_constant_p (n) \
&& ((__builtin_constant_p (s1) \
&& strlen (s1) < ((size_t) (n))) \
|| (__builtin_constant_p (s2) \
&& strlen (s2) < ((size_t) (n)))) \
? strcmp (s1, s2) : strncmp (s1, s2, n)))
#endif