From 0e7b492943ec8cfdc7fffd9304d496315f781ea7 Mon Sep 17 00:00:00 2001 From: Willy Tarreau Date: Mon, 21 Mar 2022 18:33:10 +0100 Subject: 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: Willy Tarreau Signed-off-by: Paul E. McKenney --- tools/include/nolibc/string.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'tools/include/nolibc') diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h index 4554b6fcb400..0d5e870c7c0b 100644 --- a/tools/include/nolibc/string.h +++ b/tools/include/nolibc/string.h @@ -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) -- cgit v1.2.3-59-g8ed1b