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Merge branch 'rs/memmem'

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* rs/memmem:
  optimize compat/ memmem()
  diffcore-pickaxe: use memmem()
This commit is contained in:
Junio C Hamano 2009-03-11 13:49:42 -07:00
commit 8f4cc79119
2 changed files with 12 additions and 11 deletions
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5
compat/memmem.c
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@ -5,6 +5,8 @@ void *gitmemmem(const void *haystack, size_t haystack_len,
{
const char *begin = haystack;
const char *last_possible = begin + haystack_len - needle_len;
const char *tail = needle;
char point;
/*
* The first occurrence of the empty string is deemed to occur at
@ -20,8 +22,9 @@ void *gitmemmem(const void *haystack, size_t haystack_len,
if (haystack_len < needle_len)
return NULL;
point = *tail++;
for (; begin <= last_possible; begin++) {
if (!memcmp(begin, needle, needle_len))
if (*begin == point && !memcmp(begin + 1, tail, needle_len - 1))
return (void *)begin;
}

18
diffcore-pickaxe.c
View File

@ -10,7 +10,7 @@ static unsigned int contains(struct diff_filespec *one,
regex_t *regexp)
{
unsigned int cnt;
unsigned long offset, sz;
unsigned long sz;
const char *data;
if (diff_populate_filespec(one, 0))
return 0;
@ -33,15 +33,13 @@ static unsigned int contains(struct diff_filespec *one,
}
} else { /* Classic exact string match */
/* Yes, I've heard of strstr(), but the thing is *data may
* not be NUL terminated. Sue me.
*/
for (offset = 0; offset + len <= sz; offset++) {
/* we count non-overlapping occurrences of needle */
if (!memcmp(needle, data + offset, len)) {
offset += len - 1;
cnt++;
}
while (sz) {
const char *found = memmem(data, sz, needle, len);
if (!found)
break;
sz -= found - data + len;
data = found + len;
cnt++;
}
}
diff_free_filespec_data(one);