diff options
Diffstat (limited to 'newlib/libc/string/memcmp.c')
-rw-r--r-- | newlib/libc/string/memcmp.c | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/newlib/libc/string/memcmp.c b/newlib/libc/string/memcmp.c deleted file mode 100644 index ac7a194..0000000 --- a/newlib/libc/string/memcmp.c +++ /dev/null @@ -1,113 +0,0 @@ -/* -FUNCTION - <<memcmp>>---compare two memory areas - -INDEX - memcmp - -ANSI_SYNOPSIS - #include <string.h> - int memcmp(const void *<[s1]>, const void *<[s2]>, size_t <[n]>); - -TRAD_SYNOPSIS - #include <string.h> - int memcmp(<[s1]>, <[s2]>, <[n]>) - void *<[s1]>; - void *<[s2]>; - size_t <[n]>; - -DESCRIPTION - This function compares not more than <[n]> characters of the - object pointed to by <[s1]> with the object pointed to by <[s2]>. - - -RETURNS - The function returns an integer greater than, equal to or - less than zero according to whether the object pointed to by - <[s1]> is greater than, equal to or less than the object - pointed to by <[s2]>. - -PORTABILITY -<<memcmp>> is ANSI C. - -<<memcmp>> requires no supporting OS subroutines. - -QUICKREF - memcmp ansi pure -*/ - -#include <string.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))) - -/* How many bytes are copied each iteration of the word copy loop. */ -#define LBLOCKSIZE (sizeof (long)) - -/* Threshhold for punting to the byte copier. */ -#define TOO_SMALL(LEN) ((LEN) < LBLOCKSIZE) - -int -_DEFUN (memcmp, (m1, m2, n), - _CONST _PTR m1 _AND - _CONST _PTR m2 _AND - size_t n) -{ -#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) - unsigned char *s1 = (unsigned char *) m1; - unsigned char *s2 = (unsigned char *) m2; - - while (n--) - { - if (*s1 != *s2) - { - return *s1 - *s2; - } - s1++; - s2++; - } - return 0; -#else - unsigned char *s1 = (unsigned char *) m1; - unsigned char *s2 = (unsigned char *) m2; - unsigned long *a1; - unsigned long *a2; - - /* If the size is too small, or either pointer is unaligned, - then we punt to the byte compare loop. Hopefully this will - not turn up in inner loops. */ - if (!TOO_SMALL(n) && !UNALIGNED(s1,s2)) - { - /* Otherwise, load and compare the blocks of memory one - word at a time. */ - a1 = (unsigned long*) s1; - a2 = (unsigned long*) s2; - while (n >= LBLOCKSIZE) - { - if (*a1 != *a2) - break; - a1++; - a2++; - n -= LBLOCKSIZE; - } - - /* check m mod LBLOCKSIZE remaining characters */ - - s1 = (char*)a1; - s2 = (char*)a2; - } - - while (n--) - { - if (*s1 != *s2) - return *s1 - *s2; - s1++; - s2++; - } - - return 0; -#endif /* not PREFER_SIZE_OVER_SPEED */ -} - |