path: root/credential-cache--daemon.c
diff options
authorJeff King <>2014-06-18 19:44:19 (GMT)
committerJunio C Hamano <>2014-06-20 17:44:43 (GMT)
commitcf4fff579e02d8585d59f6c8739534b7b0d617dd (patch)
tree3dc3d9b8d6b30240e73c161953a4c2589e94458c /credential-cache--daemon.c
parentc0264180d74510669bcec9bb5ff12a145c685b8e (diff)
refactor skip_prefix to return a boolean
The skip_prefix() function returns a pointer to the content past the prefix, or NULL if the prefix was not found. While this is nice and simple, in practice it makes it hard to use for two reasons: 1. When you want to conditionally skip or keep the string as-is, you have to introduce a temporary variable. For example: tmp = skip_prefix(buf, "foo"); if (tmp) buf = tmp; 2. It is verbose to check the outcome in a conditional, as you need extra parentheses to silence compiler warnings. For example: if ((cp = skip_prefix(buf, "foo")) /* do something with cp */ Both of these make it harder to use for long if-chains, and we tend to use starts_with() instead. However, the first line of "do something" is often to then skip forward in buf past the prefix, either using a magic constant or with an extra strlen(3) (which is generally computed at compile time, but means we are repeating ourselves). This patch refactors skip_prefix() to return a simple boolean, and to provide the pointer value as an out-parameter. If the prefix is not found, the out-parameter is untouched. This lets you write: if (skip_prefix(arg, "foo ", &arg)) do_foo(arg); else if (skip_prefix(arg, "bar ", &arg)) do_bar(arg); Signed-off-by: Jeff King <> Signed-off-by: Junio C Hamano <>
Diffstat (limited to 'credential-cache--daemon.c')
1 files changed, 2 insertions, 4 deletions
diff --git a/credential-cache--daemon.c b/credential-cache--daemon.c
index 390f194..3b370ca 100644
--- a/credential-cache--daemon.c
+++ b/credential-cache--daemon.c
@@ -109,14 +109,12 @@ static int read_request(FILE *fh, struct credential *c,
const char *p;
strbuf_getline(&item, fh, '\n');
- p = skip_prefix(item.buf, "action=");
- if (!p)
+ if (!skip_prefix(item.buf, "action=", &p))
return error("client sent bogus action line: %s", item.buf);
strbuf_addstr(action, p);
strbuf_getline(&item, fh, '\n');
- p = skip_prefix(item.buf, "timeout=");
- if (!p)
+ if (!skip_prefix(item.buf, "timeout=", &p))
return error("client sent bogus timeout line: %s", item.buf);
*timeout = atoi(p);