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Unroll the loop over passes

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The passes no longer share much code, and the unrolled code is easier
to understand.

Use a new index variable instead of num_attr for the second loop, as
we are no longer counting attributes but rather indexing through them.

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Michael Haggerty 2011-08-12 23:43:10 +02:00 committed by Junio C Hamano
parent e0a5f9aaae
commit d68e1c183c
1 changed files with 26 additions and 25 deletions
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51
attr.c
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@ -191,10 +191,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
int lineno, int macro_ok)
{
int namelen;
int num_attr;
int num_attr, i;
const char *cp, *name, *states;
struct match_attr *res = NULL;
int pass;
int is_macro;
cp = line + strspn(line, blank);
@ -226,30 +225,32 @@ static struct match_attr *parse_attr_line(const char *line, const char *src,
states = name + namelen;
states += strspn(states, blank);
for (pass = 0; pass < 2; pass++) {
/* pass 0 counts and allocates, pass 1 fills */
for (cp = states, num_attr = 0; *cp; num_attr++) {
cp = parse_attr(src, lineno, cp,
pass ? &(res->state[num_attr]) : NULL);
if (!cp)
return NULL;
}
if (pass)
break;
res = xcalloc(1,
sizeof(*res) +
sizeof(struct attr_state) * num_attr +
(is_macro ? 0 : namelen + 1));
if (is_macro)
res->u.attr = git_attr_internal(name, namelen);
else {
res->u.pattern = (char *)&(res->state[num_attr]);
memcpy(res->u.pattern, name, namelen);
res->u.pattern[namelen] = 0;
}
res->is_macro = is_macro;
res->num_attr = num_attr;
/* First pass to count the attr_states */
for (cp = states, num_attr = 0; *cp; num_attr++) {
cp = parse_attr(src, lineno, cp, NULL);
if (!cp)
return NULL;
}
res = xcalloc(1,
sizeof(*res) +
sizeof(struct attr_state) * num_attr +
(is_macro ? 0 : namelen + 1));
if (is_macro)
res->u.attr = git_attr_internal(name, namelen);
else {
res->u.pattern = (char *)&(res->state[num_attr]);
memcpy(res->u.pattern, name, namelen);
res->u.pattern[namelen] = 0;
}
res->is_macro = is_macro;
res->num_attr = num_attr;
/* Second pass to fill the attr_states */
for (cp = states, i = 0; *cp; i++) {
cp = parse_attr(src, lineno, cp, &(res->state[i]));
}
return res;
}