Commit 0e7b4929 authored by Willy Tarreau's avatar Willy Tarreau Committed by Paul E. McKenney
Browse files

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



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: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent bd845a19

tools/include/nolibc/string.h

+23 −0
Original line number Diff line number Diff line
@@ -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)