C: use skip_prefix() to avoid hardcoded string length
We often skip an optional prefix in a string with a hardcoded constant, e.g. if (starts_with(string, "prefix")) string += 6; which is less error prone when written skip_prefix(string, "prefix", &string); Note that this changes a few error messages from "git reflog expire --expire=nonsense.timestamp", which used to complain by saying '--expire=nonsense.timestamp' is not a valid timestamp but with this change, we say 'nonsense.timestamp' is not a valid timestamp which is more technically correct (the string with --expire= as a prefix obviously cannot be a valid timestamp, but the error is about the part of the input without that prefix). Helped-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Junio C Hamano committed
Jan 30, 2020 at 11:35 UTC
145136a95a8755528aa012a4ce0ed50d1ec39e24
8 files changed
+18
-25
builtin/fast-export.c
+1
-2
index dbec4df92b..164406fdd4 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -870,8 +870,7 @@ static void handle_tag(const char *name, struct tag *tag)
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
}
- if (starts_with(name, "refs/tags/"))
- name += 10;
+ skip_prefix(name, "refs/tags/", &name);
printf("tag %s\n", name);
if (mark_tags) {
mark_next_object(&tag->object);
builtin/reflog.c
+5
-4
index 4d3430900d..81dfd563c0 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -560,15 +560,16 @@ static int cmd_reflog_expire(int argc, const char **argv, const char *prefix)
for (i = 1; i < argc; i++) {
const char *arg = argv[i];
+
if (!strcmp(arg, "--dry-run") || !strcmp(arg, "-n"))
flags |= EXPIRE_REFLOGS_DRY_RUN;
- else if (starts_with(arg, "--expire=")) {
- if (parse_expiry_date(arg + 9, &cb.cmd.expire_total))
+ else if (skip_prefix(arg, "--expire=", &arg)) {
+ if (parse_expiry_date(arg, &cb.cmd.expire_total))
die(_("'%s' is not a valid timestamp"), arg);
explicit_expiry |= EXPIRE_TOTAL;
}
- else if (starts_with(arg, "--expire-unreachable=")) {
- if (parse_expiry_date(arg + 21, &cb.cmd.expire_unreachable))
+ else if (skip_prefix(arg, "--expire-unreachable=", &arg)) {
+ if (parse_expiry_date(arg, &cb.cmd.expire_unreachable))
die(_("'%s' is not a valid timestamp"), arg);
explicit_expiry |= EXPIRE_UNREACH;
}
notes.c
+2
-4
index 0c79964c26..a0349fa778 100644
--- a/notes.c
+++ b/notes.c
@@ -1279,10 +1279,8 @@ static void format_note(struct notes_tree *t, const struct object_id *object_oid
if (!ref || !strcmp(ref, GIT_NOTES_DEFAULT_REF)) {
strbuf_addstr(sb, "\nNotes:\n");
} else {
- if (starts_with(ref, "refs/"))
- ref += 5;
- if (starts_with(ref, "notes/"))
- ref += 6;
+ skip_prefix(ref, "refs/", &ref);
+ skip_prefix(ref, "notes/", &ref);
strbuf_addf(sb, "\nNotes (%s):\n", ref);
}
}
parse-options.c
+1
-2
index 60fae3ad21..e8c04109ba 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -357,8 +357,7 @@ is_abbreviated:
}
/* negated? */
if (!starts_with(arg, "no-")) {
- if (starts_with(long_name, "no-")) {
- long_name += 3;
+ if (skip_prefix(long_name, "no-", &long_name)) {
opt_flags |= OPT_UNSET;
goto again;
}
refs/files-backend.c
+1
-2
index 0ea66a28b6..561c33ac8a 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -465,8 +465,7 @@ stat_ref:
close(fd);
strbuf_rtrim(&sb_contents);
buf = sb_contents.buf;
- if (starts_with(buf, "ref:")) {
- buf += 4;
+ if (skip_prefix(buf, "ref:", &buf)) {
while (isspace(*buf))
buf++;
remote-curl.c
+3
-2
index 350d92a074..8eb96152f5 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -1255,8 +1255,9 @@ static void parse_push(struct strbuf *buf)
int ret;
do {
- if (starts_with(buf->buf, "push "))
- argv_array_push(&specs, buf->buf + 5);
+ const char *arg;
+ if (skip_prefix(buf->buf, "push ", &arg))
+ argv_array_push(&specs, arg);
else
die(_("http transport does not support %s"), buf->buf);
sha1-name.c
+2
-7
index 200eb373ad..75d1c32606 100644
--- a/sha1-name.c
+++ b/sha1-name.c
@@ -908,14 +908,9 @@ static int get_oid_basic(struct repository *r, const char *str, int len,
real_ref, flags, at_time, nth, oid, NULL,
&co_time, &co_tz, &co_cnt)) {
if (!len) {
- if (starts_with(real_ref, "refs/heads/")) {
- str = real_ref + 11;
- len = strlen(real_ref + 11);
- } else {
- /* detached HEAD */
+ if (!skip_prefix(real_ref, "refs/heads/", &str))
str = "HEAD";
- len = 4;
- }
+ len = strlen(str);
}
if (at_time) {
if (!(flags & GET_OID_QUIETLY)) {
transport-helper.c
+3
-2
index 413d9d873e..20a7185ec4 100644
--- a/transport-helper.c
+++ b/transport-helper.c
@@ -404,11 +404,12 @@ static int fetch_with_fetch(struct transport *transport,
sendline(data, &buf);
while (1) {
+ const char *name;
+
if (recvline(data, &buf))
exit(128);
- if (starts_with(buf.buf, "lock ")) {
- const char *name = buf.buf + 5;
+ if (skip_prefix(buf.buf, "lock ", &name)) {
if (transport->pack_lockfile)
warning(_("%s also locked %s"), data->name, name);
else