Changeset 6e8ed225 in mainline for uspace/lib/c/generic/mem.c


Ignore:
Timestamp:
2013-05-20T18:43:13Z (12 years ago)
Author:
Jiri Svoboda <jiri@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
4a5a18be
Parents:
d242cb6 (diff), acdb5bac (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.
Message:

Merge: Replacement of BSD functions bzero, bcmp with C standard memset, memcmp.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • uspace/lib/c/generic/mem.c

    rd242cb6 r6e8ed225  
    224224 * @param s1  Pointer to the first area to compare.
    225225 * @param s2  Pointer to the second area to compare.
    226  * @param len Size of the first area in bytes. Both areas must have
    227  *            the same length.
    228  *
    229  * @return If len is 0, return zero. If the areas match, return
    230  *         zero. Otherwise return non-zero.
    231  *
    232  */
    233 int bcmp(const void *s1, const void *s2, size_t len)
     226 * @param len Size of the areas in bytes.
     227 *
     228 * @return Zero if areas have the same contents. If they differ,
     229 *         the sign of the result is the same as the sign of the
     230 *         difference of the first pair of different bytes.
     231 *
     232 */
     233int memcmp(const void *s1, const void *s2, size_t len)
    234234{
    235235        uint8_t *u1 = (uint8_t *) s1;
    236236        uint8_t *u2 = (uint8_t *) s2;
    237        
    238         for (; (len != 0) && (*u1++ == *u2++); len--);
    239        
    240         return len;
     237        size_t i;
     238
     239        for (i = 0; i < len; i++) {
     240                if (*u1 != *u2)
     241                        return (int)(*u1) - (int)(*u2);
     242                ++u1;
     243                ++u2;
     244        }
     245
     246        return 0;
    241247}
    242248
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