It's a common idiom to match a prefix and then skip past it
with strlen, like:
if (starts_with(foo, "bar"))
foo += strlen("bar");
This avoids magic numbers, but means we have to repeat the
string (and there is no compiler check that we didn't make a
typo in one of the strings).
We can use skip_prefix to handle this case without repeating
ourselves.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
builtin/checkout.c | 4 ++--
builtin/fmt-merge-msg.c | 6 +++---
builtin/log.c | 12 ++++++------
diff.c | 27 +++++++++------------------
help.c | 7 ++++---
merge-recursive.c | 15 ++++++++-------
pretty.c | 3 +--
remote-curl.c | 15 ++++++++-------
remote.c | 5 ++---
sha1_name.c | 4 +---
10 files changed, 44 insertions(+), 54 deletions(-)
diff --git a/builtin/checkout.c b/builtin/checkout.c
index f1dc56e..463cfee 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -776,8 +776,8 @@ static int switch_branches(const struct checkout_opts *opts,
if (!(flag & REF_ISSYMREF))
old.path = NULL;
- if (old.path && starts_with(old.path, "refs/heads/"))
- old.name = old.path + strlen("refs/heads/");
+ if (old.path)
+ skip_prefix(old.path, "refs/heads/", &old.name);
if (!new->name) {
new->name = "HEAD";
diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 3c19241..ad3bc58 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -100,7 +100,8 @@ static int handle_line(char *line, struct merge_parents *merge_parents)
{
int i, len = strlen(line);
struct origin_data *origin_data;
- char *src, *origin;
+ char *src;
+ const char *origin;
struct src_data *src_data;
struct string_list_item *item;
int pulling_head = 0;
@@ -164,8 +165,7 @@ static int handle_line(char *line, struct merge_parents *merge_parents)
origin = line;
string_list_append(&src_data->tag, origin + 4);
src_data->head_status |= 2;
- } else if (starts_with(line, "remote-tracking branch ")) {
- origin = line + strlen("remote-tracking branch ");
+ } else if (skip_prefix(line, "remote-tracking branch ", &origin)) {
string_list_append(&src_data->r_branch, origin);
src_data->head_status |= 2;
} else {
diff --git a/builtin/log.c b/builtin/log.c
index a7ba211..0f59c25 100644
--- a/builtin/log.c
+++ b/builtin/log.c
@@ -872,7 +872,7 @@ static char *find_branch_name(struct rev_info *rev)
int i, positive = -1;
unsigned char branch_sha1[20];
const unsigned char *tip_sha1;
- const char *ref;
+ const char *ref, *v;
char *full_ref, *branch = NULL;
for (i = 0; i < rev->cmdline.nr; i++) {
@@ -888,9 +888,9 @@ static char *find_branch_name(struct rev_info *rev)
ref = rev->cmdline.rev[positive].name;
tip_sha1 = rev->cmdline.rev[positive].item->sha1;
if (dwim_ref(ref, strlen(ref), branch_sha1, &full_ref) &&
- starts_with(full_ref, "refs/heads/") &&
+ skip_prefix(full_ref, "refs/heads/", &v) &&
!hashcmp(tip_sha1, branch_sha1))
- branch = xstrdup(full_ref + strlen("refs/heads/"));
+ branch = xstrdup(v);
free(full_ref);
return branch;
}
@@ -1394,10 +1394,10 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
if (check_head) {
unsigned char sha1[20];
- const char *ref;
+ const char *ref, *v;
ref = resolve_ref_unsafe("HEAD", sha1, 1, NULL);
- if (ref && starts_with(ref, "refs/heads/"))
- branch_name = xstrdup(ref + strlen("refs/heads/"));
+ if (ref && skip_prefix(ref, "refs/heads/", &v))
+ branch_name = xstrdup(v);
else
branch_name = xstrdup(""); /* no branch */
}
diff --git a/diff.c b/diff.c
index 97db932..2378ae4 100644
--- a/diff.c
+++ b/diff.c
@@ -3395,12 +3395,10 @@ int parse_long_opt(const char *opt, const char **argv,
const char **optarg)
{
const char *arg = argv[0];
- if (arg[0] != '-' || arg[1] != '-')
+ if (!skip_prefix(arg, "--", &arg))
return 0;
- arg += strlen("--");
- if (!starts_with(arg, opt))
+ if (!skip_prefix(arg, opt, &arg))
return 0;
- arg += strlen(opt);
if (*arg == '=') { /* stuck form: --option=value */
*optarg = arg + 1;
return 1;
@@ -3429,8 +3427,7 @@ static int stat_opt(struct diff_options *options, const char **av)
switch (*arg) {
case '-':
- if (starts_with(arg, "-width")) {
- arg += strlen("-width");
+ if (skip_prefix(arg, "-width", &arg)) {
if (*arg == '=')
width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
@@ -3439,8 +3436,7 @@ static int stat_opt(struct diff_options *options, const char **av)
width = strtoul(av[1], &end, 10);
argcount = 2;
}
- } else if (starts_with(arg, "-name-width")) {
- arg += strlen("-name-width");
+ } else if (skip_prefix(arg, "-name-width", &arg)) {
if (*arg == '=')
name_width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
@@ -3449,8 +3445,7 @@ static int stat_opt(struct diff_options *options, const char **av)
name_width = strtoul(av[1], &end, 10);
argcount = 2;
}
- } else if (starts_with(arg, "-graph-width")) {
- arg += strlen("-graph-width");
+ } else if (skip_prefix(arg, "-graph-width", &arg)) {
if (*arg == '=')
graph_width = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
@@ -3459,8 +3454,7 @@ static int stat_opt(struct diff_options *options, const char **av)
graph_width = strtoul(av[1], &end, 10);
argcount = 2;
}
- } else if (starts_with(arg, "-count")) {
- arg += strlen("-count");
+ } else if (skip_prefix(arg, "-count", &arg)) {
if (*arg == '=')
count = strtoul(arg + 1, &end, 10);
else if (!*arg && !av[1])
@@ -3905,16 +3899,13 @@ static int diff_scoreopt_parse(const char *opt)
cmd = *opt++;
if (cmd == '-') {
/* convert the long-form arguments into short-form versions */
- if (starts_with(opt, "break-rewrites")) {
- opt += strlen("break-rewrites");
+ if (skip_prefix(opt, "break-rewrites", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'B';
- } else if (starts_with(opt, "find-copies")) {
- opt += strlen("find-copies");
+ } else if (skip_prefix(opt, "find-copies", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'C';
- } else if (starts_with(opt, "find-renames")) {
- opt += strlen("find-renames");
+ } else if (skip_prefix(opt, "find-renames", &opt)) {
if (*opt == 0 || *opt++ == '=')
cmd = 'M';
}
diff --git a/help.c b/help.c
index b0f1a69..79e8007 100644
--- a/help.c
+++ b/help.c
@@ -414,11 +414,12 @@ static int append_similar_ref(const char *refname, const unsigned char *sha1,
{
struct similar_ref_cb *cb = (struct similar_ref_cb *)(cb_data);
char *branch = strrchr(refname, '/') + 1;
+ const char *remote;
+
/* A remote branch of the same name is deemed similar */
- if (starts_with(refname, "refs/remotes/") &&
+ if (skip_prefix(refname, "refs/remotes/", &remote) &&
!strcmp(branch, cb->base_ref))
- string_list_append(cb->similar_refs,
- refname + strlen("refs/remotes/"));
+ string_list_append(cb->similar_refs, remote);
return 0;
}
diff --git a/merge-recursive.c b/merge-recursive.c
index cab16fa..f848001 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2063,6 +2063,8 @@ void init_merge_options(struct merge_options *o)
int parse_merge_opt(struct merge_options *o, const char *s)
{
+ const char *arg;
+
if (!s || !*s)
return -1;
if (!strcmp(s, "ours"))
@@ -2071,14 +2073,14 @@ int parse_merge_opt(struct merge_options *o, const char *s)
o->recursive_variant = MERGE_RECURSIVE_THEIRS;
else if (!strcmp(s, "subtree"))
o->subtree_shift = "";
- else if (starts_with(s, "subtree="))
- o->subtree_shift = s + strlen("subtree=");
+ else if (skip_prefix(s, "subtree=", &arg))
+ o->subtree_shift = arg;
else if (!strcmp(s, "patience"))
o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
else if (!strcmp(s, "histogram"))
o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
- else if (starts_with(s, "diff-algorithm=")) {
- long value = parse_algorithm_value(s + strlen("diff-algorithm="));
+ else if (skip_prefix(s, "diff-algorithm=", &arg)) {
+ long value = parse_algorithm_value(arg);
if (value < 0)
return -1;
/* clear out previous settings */
@@ -2096,9 +2098,8 @@ int parse_merge_opt(struct merge_options *o, const char *s)
o->renormalize = 1;
else if (!strcmp(s, "no-renormalize"))
o->renormalize = 0;
- else if (starts_with(s, "rename-threshold=")) {
- const char *score = s + strlen("rename-threshold=");
- if ((o->rename_score = parse_rename_score(&score)) == -1 || *score != 0)
+ else if (skip_prefix(s, "rename-threshold=", &arg)) {
+ if ((o->rename_score = parse_rename_score(&arg)) == -1 || *arg != 0)
return -1;
}
else
diff --git a/pretty.c b/pretty.c
index 4f51287..f24752a 100644
--- a/pretty.c
+++ b/pretty.c
@@ -40,10 +40,9 @@ static int git_pretty_formats_config(const char *var, const char *value, void *c
const char *fmt;
int i;
- if (!starts_with(var, "pretty."))
+ if (!skip_prefix(var, "pretty.", &name))
return 0;
- name = var + strlen("pretty.");
for (i = 0; i < builtin_formats_len; i++) {
if (!strcmp(commit_formats[i].name, name))
return 0;
diff --git a/remote-curl.c b/remote-curl.c
index 4493b38..cdcca29 100644
--- a/remote-curl.c
+++ b/remote-curl.c
@@ -791,9 +791,9 @@ static void parse_fetch(struct strbuf *buf)
int alloc_heads = 0, nr_heads = 0;
do {
- if (starts_with(buf->buf, "fetch ")) {
- char *p = buf->buf + strlen("fetch ");
- char *name;
+ const char *p;
+ if (skip_prefix(buf->buf, "fetch ", &p)) {
+ const char *name;
struct ref *ref;
unsigned char old_sha1[20];
@@ -968,6 +968,8 @@ int main(int argc, const char **argv)
http_init(remote, url.buf, 0);
do {
+ const char *arg;
+
if (strbuf_getline(&buf, stdin, '\n') == EOF) {
if (ferror(stdin))
fprintf(stderr, "Error reading command stream\n");
@@ -989,9 +991,8 @@ int main(int argc, const char **argv)
} else if (starts_with(buf.buf, "push ")) {
parse_push(&buf);
- } else if (starts_with(buf.buf, "option ")) {
- char *name = buf.buf + strlen("option ");
- char *value = strchr(name, ' ');
+ } else if (skip_prefix(buf.buf, "option ", &arg)) {
+ char *value = strchr(arg, ' ');
int result;
if (value)
@@ -999,7 +1000,7 @@ int main(int argc, const char **argv)
else
value = "true";
- result = set_option(name, value);
+ result = set_option(arg, value);
if (!result)
printf("ok\n");
else if (result < 0)
diff --git a/remote.c b/remote.c
index 0e9459c..30d2829 100644
--- a/remote.c
+++ b/remote.c
@@ -488,9 +488,8 @@ static void read_config(void)
current_branch = NULL;
head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
if (head_ref && (flag & REF_ISSYMREF) &&
- starts_with(head_ref, "refs/heads/")) {
- current_branch =
- make_branch(head_ref + strlen("refs/heads/"), 0);
+ skip_prefix(head_ref, "refs/heads/", &head_ref)) {
+ current_branch = make_branch(head_ref, 0);
}
git_config(handle_config, NULL);
if (branch_pushremote_name) {
diff --git a/sha1_name.c b/sha1_name.c
index 2b6322f..72e6ac6 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -911,10 +911,8 @@ static int grab_nth_branch_switch(unsigned char *osha1, unsigned char *nsha1,
const char *match = NULL, *target = NULL;
size_t len;
- if (starts_with(message, "checkout: moving from ")) {
- match = message + strlen("checkout: moving from ");
+ if (skip_prefix(message, "checkout: moving from ", &match))
target = strstr(match, " to ");
- }
if (!match || !target)
return 0;
--
2.0.0.566.gfe3e6b2
--
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