diff options
Diffstat (limited to 'newlib/libc/string/strncmp.c')
-rw-r--r-- | newlib/libc/string/strncmp.c | 122 |
1 files changed, 0 insertions, 122 deletions
diff --git a/newlib/libc/string/strncmp.c b/newlib/libc/string/strncmp.c deleted file mode 100644 index 9801b7d..0000000 --- a/newlib/libc/string/strncmp.c +++ /dev/null @@ -1,122 +0,0 @@ -/* -FUNCTION - <<strncmp>>---character string compare - -INDEX - strncmp - -ANSI_SYNOPSIS - #include <string.h> - int strncmp(const char *<[a]>, const char * <[b]>, size_t <[length]>); - -TRAD_SYNOPSIS - #include <string.h> - int strncmp(<[a]>, <[b]>, <[length]>) - char *<[a]>; - char *<[b]>; - size_t <[length]> - -DESCRIPTION - <<strncmp>> compares up to <[length]> characters - from the string at <[a]> to the string at <[b]>. - -RETURNS - If <<*<[a]>>> sorts lexicographically after <<*<[b]>>>, - <<strncmp>> returns a number greater than zero. If the two - strings are equivalent, <<strncmp>> returns zero. If <<*<[a]>>> - sorts lexicographically before <<*<[b]>>>, <<strncmp>> returns a - number less than zero. - -PORTABILITY -<<strncmp>> is ANSI C. - -<<strncmp>> requires no supporting OS subroutines. - -QUICKREF - strncmp ansi pure -*/ - -#include <string.h> -#include <limits.h> - -/* Nonzero if either X or Y is not aligned on a "long" boundary. */ -#define UNALIGNED(X, Y) \ - (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1))) - -/* DETECTNULL returns nonzero if (long)X contains a NULL byte. */ -#if LONG_MAX == 2147483647L -#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) -#else -#if LONG_MAX == 9223372036854775807L -#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) -#else -#error long int is not a 32bit or 64bit type. -#endif -#endif - -#ifndef DETECTNULL -#error long int is not a 32bit or 64bit byte -#endif - -int -_DEFUN (strncmp, (s1, s2, n), - _CONST char *s1 _AND - _CONST char *s2 _AND - size_t n) -{ -#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) - if (n == 0) - return 0; - - while (n-- != 0 && *s1 == *s2) - { - if (n == 0 || *s1 == '\0') - break; - s1++; - s2++; - } - - return (*(unsigned char *) s1) - (*(unsigned char *) s2); -#else - unsigned long *a1; - unsigned long *a2; - - if (n == 0) - return 0; - - /* If s1 or s2 are unaligned, then compare bytes. */ - if (!UNALIGNED (s1, s2)) - { - /* If s1 and s2 are word-aligned, compare them a word at a time. */ - a1 = (unsigned long*)s1; - a2 = (unsigned long*)s2; - while (n >= sizeof (long) && *a1 == *a2) - { - n -= sizeof (long); - - /* If we've run out of bytes or hit a null, return zero - since we already know *a1 == *a2. */ - if (n == 0 || DETECTNULL (*a1)) - return 0; - - a1++; - a2++; - } - - /* A difference was detected in last few bytes of s1, so search bytewise */ - s1 = (char*)a1; - s2 = (char*)a2; - } - - while (n-- > 0 && *s1 == *s2) - { - /* If we've run out of bytes or hit a null, return zero - since we already know *s1 == *s2. */ - if (n == 0 || *s1 == '\0') - return 0; - s1++; - s2++; - } - return (*(unsigned char *) s1) - (*(unsigned char *) s2); -#endif /* not PREFER_SIZE_OVER_SPEED */ -} |