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tools/nolibc/string: add strcmp() and strncmp()

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We need these functions all the time, including when checking environment
variables and parsing command-line arguments. These implementations were
optimized to show optimal code size on a wide range of compilers (22 bytes
return included for strcmp(), 33 for strncmp()).

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2022-03-21 18:33:10 +01:00 committed by Paul E. McKenney
parent bd845a193a
commit 0e7b492943
1 changed files with 23 additions and 0 deletions
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23
tools/include/nolibc/string.h
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@ -102,6 +102,17 @@ char *strchr(const char *s, int c)
return NULL;
}
static __attribute__((unused))
int strcmp(const char *a, const char *b)
{
unsigned int c;
int diff;
while (!(diff = (unsigned char)*a++ - (c = (unsigned char)*b++)) && c)
;
return diff;
}
static __attribute__((unused))
char *strcpy(char *dst, const char *src)
{
@ -184,6 +195,18 @@ char *strncat(char *dst, const char *src, size_t size)
return orig;
}
static __attribute__((unused))
int strncmp(const char *a, const char *b, size_t size)
{
unsigned int c;
int diff = 0;
while (size-- &&
!(diff = (unsigned char)*a++ - (c = (unsigned char)*b++)) && c)
;
return diff;
}
static __attribute__((unused))
char *strncpy(char *dst, const char *src, size_t size)