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comparison lib/memchr2.c @ 14610:b427a1938336

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use _GL_ATTRIBUTE_CONST and _GL_ATTRIBUTE_PURE
author Jim Meyering <meyering@redhat.com>
date Sun, 24 Apr 2011 19:02:10 +0200
parents 97fc9a21a8fb
children 6ef4f1f39105
comparison
equal deleted inserted replaced
14609:97b99ef6c731 14610:b427a1938336
27 27
28 #include <limits.h> 28 #include <limits.h>
29 #include <stdint.h> 29 #include <stdint.h>
30 #include <string.h> 30 #include <string.h>
31 31
32 /* The attribute __pure__ was added in gcc 2.96. */
33 #undef _GL_ATTRIBUTE_PURE
34 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
35 # define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
36 #else
37 # define _GL_ATTRIBUTE_PURE /* empty */
38 #endif
39
32 /* Return the first address of either C1 or C2 (treated as unsigned 40 /* Return the first address of either C1 or C2 (treated as unsigned
33 char) that occurs within N bytes of the memory region S. If 41 char) that occurs within N bytes of the memory region S. If
34 neither byte appears, return NULL. */ 42 neither byte appears, return NULL. */
35 void * 43 void * _GL_ATTRIBUTE_PURE
36 memchr2 (void const *s, int c1_in, int c2_in, size_t n) 44 memchr2 (void const *s, int c1_in, int c2_in, size_t n)
37 { 45 {
38 /* On 32-bit hardware, choosing longword to be a 32-bit unsigned 46 /* On 32-bit hardware, choosing longword to be a 32-bit unsigned
39 long instead of a 64-bit uintmax_t tends to give better 47 long instead of a 64-bit uintmax_t tends to give better
40 performance. On 64-bit hardware, unsigned long is generally 64 48 performance. On 64-bit hardware, unsigned long is generally 64