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use skip_prefix to avoid magic numbers

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It's a common idiom to match a prefix and then skip past it
with a magic number, like:

  if (starts_with(foo, "bar"))
	  foo += 3;

This is easy to get wrong, since you have to count the
prefix string yourself, and there's no compiler check if the
string changes.  We can use skip_prefix to avoid the magic
numbers here.

Note that some of these conversions could be much shorter.
For example:

  if (starts_with(arg, "--foo=")) {
	  bar = arg + 6;
	  continue;
  }

could become:

  if (skip_prefix(arg, "--foo=", &bar))
	  continue;

However, I have left it as:

  if (skip_prefix(arg, "--foo=", &v)) {
	  bar = v;
	  continue;
  }

to visually match nearby cases which need to actually
process the string. Like:

  if (skip_prefix(arg, "--foo=", &v)) {
	  bar = atoi(v);
	  continue;
  }

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King
2014-06-18 15:47:50 -04:00
committed by Junio C Hamano
parent 21a2d4ada5
commit ae021d8791
11 changed files with 149 additions and 131 deletions
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11
http-push.c
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@ -770,9 +770,9 @@ static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
lock->owner = xmalloc(strlen(ctx->cdata) + 1);
strcpy(lock->owner, ctx->cdata);
} else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
if (starts_with(ctx->cdata, "Second-"))
lock->timeout =
strtol(ctx->cdata + 7, NULL, 10);
const char *arg;
if (skip_prefix(ctx->cdata, "Second-", &arg))
lock->timeout = strtol(arg, NULL, 10);
} else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
lock->token = xmalloc(strlen(ctx->cdata) + 1);
strcpy(lock->token, ctx->cdata);
@ -1561,6 +1561,7 @@ static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
{
char *url;
struct strbuf buffer = STRBUF_INIT;
const char *name;
url = xmalloc(strlen(repo->url) + strlen(path) + 1);
sprintf(url, "%s%s", repo->url, path);
@ -1578,8 +1579,8 @@ static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
return;
/* If it's a symref, set the refname; otherwise try for a sha1 */
if (starts_with((char *)buffer.buf, "ref: ")) {
*symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
if (skip_prefix(buffer.buf, "ref: ", &name)) {
*symref = xmemdupz(name, buffer.len - (name - buffer.buf));
} else {
get_sha1_hex(buffer.buf, sha1);
}