Avoid scanning strings twice, once with strchr() and then with
strlen(), by using strchrnul().
Helped-by: Junio C Hamano <gits...@pobox.com>
Signed-off-by: Rohit Mani <rohit.m...@outlook.com>
---
PATCH v2 Updated commit description
Updated code according to suggestions [1]
[1] http://article.gmane.org/gmane.comp.version-control.git/243550
archive.c | 4 ++--
cache-tree.c | 15 ++++++---------
diff.c | 9 +++------
fast-import.c | 35 +++++++++++++----------------------
match-trees.c | 11 ++++-------
parse-options.c | 5 +----
pretty.c | 5 ++---
remote-testsvn.c | 4 ++--
ws.c | 7 ++-----
9 files changed, 35 insertions(+), 60 deletions(-)
diff --git a/archive.c b/archive.c
index 346f3b2..d196215 100644
--- a/archive.c
+++ b/archive.c
@@ -259,8 +259,8 @@ static void parse_treeish_arg(const char **argv,
/* Remotes are only allowed to fetch actual refs */
if (remote) {
char *ref = NULL;
- const char *colon = strchr(name, ':');
- int refnamelen = colon ? colon - name : strlen(name);
+ const char *colon = strchrnul(name, ':');
+ int refnamelen = colon - name;
if (!dwim_ref(name, refnamelen, sha1, &ref))
die("no such ref: %.*s", refnamelen, name);
diff --git a/cache-tree.c b/cache-tree.c
index 0bbec43..2130f32 100644
--- a/cache-tree.c
+++ b/cache-tree.c
@@ -121,11 +121,11 @@ void cache_tree_invalidate_path(struct cache_tree *it,
const char *path)
if (!it)
return;
- slash = strchr(path, '/');
+ slash = strchrnul(path, '/');
+ namelen = slash - path;
it->entry_count = -1;
- if (!slash) {
+ if (!*slash) {
int pos;
- namelen = strlen(path);
pos = subtree_pos(it, path, namelen);
if (0 <= pos) {
cache_tree_free(&it->down[pos]->cache_tree);
@@ -143,7 +143,6 @@ void cache_tree_invalidate_path(struct cache_tree *it,
const char *path)
}
return;
}
- namelen = slash - path;
down = find_subtree(it, path, namelen, 0);
if (down)
cache_tree_invalidate_path(down->cache_tree, slash + 1);
@@ -554,9 +553,7 @@ static struct cache_tree *cache_tree_find(struct cache_tree
*it, const char *pat
const char *slash;
struct cache_tree_sub *sub;
- slash = strchr(path, '/');
- if (!slash)
- slash = path + strlen(path);
+ slash = strchrnul(path, '/');
/* between path and slash is the name of the
* subtree to look for.
*/
@@ -564,10 +561,10 @@ static struct cache_tree *cache_tree_find(struct
cache_tree *it, const char *pat
if (!sub)
return NULL;
it = sub->cache_tree;
- if (slash)
+ if (*slash)
while (*slash && *slash == '/')
slash++;
- if (!slash || !*slash)
+ if (!*slash)
return it; /* prefix ended with slashes */
path = slash;
}
diff --git a/diff.c b/diff.c
index e800666..cb6b98b 100644
--- a/diff.c
+++ b/diff.c
@@ -3365,14 +3365,11 @@ static int opt_arg(const char *arg, int arg_short,
const char *arg_long, int *va
if (c != '-')
return 0;
arg++;
- eq = strchr(arg, '=');
- if (eq)
- len = eq - arg;
- else
- len = strlen(arg);
+ eq = strchrnul(arg, '=');
+ len = eq - arg;
if (!len || strncmp(arg, arg_long, len))
return 0;
- if (eq) {
+ if (*eq) {
int n;
char *end;
if (!isdigit(*++eq))
diff --git a/fast-import.c b/fast-import.c
index 4fd18a3..dbbf6b0 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1485,14 +1485,11 @@ static int tree_content_set(
unsigned int i, n;
struct tree_entry *e;
- slash1 = strchr(p, '/');
- if (slash1)
- n = slash1 - p;
- else
- n = strlen(p);
+ slash1 = strchrnul(p, '/');
+ n = slash1 - p;
if (!n)
die("Empty path component found in input");
- if (!slash1 && !S_ISDIR(mode) && subtree)
+ if (!*slash1 && !S_ISDIR(mode) && subtree)
die("Non-directories cannot have subtrees");
if (!root->tree)
@@ -1501,7 +1498,7 @@ static int tree_content_set(
for (i = 0; i < t->entry_count; i++) {
e = t->entries[i];
if (e->name->str_len == n && !strncmp_icase(p,
e->name->str_dat, n)) {
- if (!slash1) {
+ if (!*slash1) {
if (!S_ISDIR(mode)
&& e->versions[1].mode == mode
&&
!hashcmp(e->versions[1].sha1, sha1))
@@ -1552,7 +1549,7 @@ static int tree_content_set(
e->versions[0].mode = 0;
hashclr(e->versions[0].sha1);
t->entries[t->entry_count++] = e;
- if (slash1) {
+ if (*slash1) {
e->tree = new_tree_content(8);
e->versions[1].mode = S_IFDIR;
tree_content_set(e, slash1 + 1, sha1, mode, subtree);
@@ -1576,12 +1573,9 @@ static int tree_content_remove(
unsigned int i, n;
struct tree_entry *e;
- slash1 = strchr(p, '/');
- if (slash1)
- n = slash1 - p;
- else
- n = strlen(p);
-
+ slash1 = strchrnul(p, '/');
+ n = slash1 - p;
+
if (!root->tree)
load_tree(root);
@@ -1594,7 +1588,7 @@ static int tree_content_remove(
for (i = 0; i < t->entry_count; i++) {
e = t->entries[i];
if (e->name->str_len == n && !strncmp_icase(p,
e->name->str_dat, n)) {
- if (slash1 && !S_ISDIR(e->versions[1].mode))
+ if (*slash1 && !S_ISDIR(e->versions[1].mode))
/*
* If p names a file in some subdirectory, and a
* file or symlink matching the name of the
@@ -1602,7 +1596,7 @@ static int tree_content_remove(
* exist and need not be deleted.
*/
return 1;
- if (!slash1 || !S_ISDIR(e->versions[1].mode))
+ if (!*slash1 || !S_ISDIR(e->versions[1].mode))
goto del_entry;
if (!e->tree)
load_tree(e);
@@ -1644,11 +1638,8 @@ static int tree_content_get(
unsigned int i, n;
struct tree_entry *e;
- slash1 = strchr(p, '/');
- if (slash1)
- n = slash1 - p;
- else
- n = strlen(p);
+ slash1 = strchrnul(p, '/');
+ n = slash1 - p;
if (!n && !allow_root)
die("Empty path component found in input");
@@ -1664,7 +1655,7 @@ static int tree_content_get(
for (i = 0; i < t->entry_count; i++) {
e = t->entries[i];
if (e->name->str_len == n && !strncmp_icase(p,
e->name->str_dat, n)) {
- if (!slash1)
+ if (!*slash1)
goto found_entry;
if (!S_ISDIR(e->versions[1].mode))
return 0;
diff --git a/match-trees.c b/match-trees.c
index 7873cde..e80b4af 100644
--- a/match-trees.c
+++ b/match-trees.c
@@ -182,13 +182,10 @@ static int splice_tree(const unsigned char *hash1,
enum object_type type;
int status;
- subpath = strchr(prefix, '/');
- if (!subpath)
- toplen = strlen(prefix);
- else {
- toplen = subpath - prefix;
+ subpath = strchrnul(prefix, '/');
+ toplen = subpath - prefix;
+ if (*subpath)
subpath++;
- }
buf = read_sha1_file(hash1, &type, &sz);
if (!buf)
@@ -215,7 +212,7 @@ static int splice_tree(const unsigned char *hash1,
if (!rewrite_here)
die("entry %.*s not found in tree %s",
toplen, prefix, sha1_to_hex(hash1));
- if (subpath) {
+ if (*subpath) {
status = splice_tree(rewrite_here, subpath, hash2, subtree);
if (status)
return status;
diff --git a/parse-options.c b/parse-options.c
index 7b8d3fa..a5fa0b8 100644
--- a/parse-options.c
+++ b/parse-options.c
@@ -223,13 +223,10 @@ static int parse_long_opt(struct parse_opt_ctx_t *p,
const char *arg,
const struct option *options)
{
const struct option *all_opts = options;
- const char *arg_end = strchr(arg, '=');
+ const char *arg_end = strchrnul(arg, '=');
const struct option *abbrev_option = NULL, *ambiguous_option = NULL;
int abbrev_flags = 0, ambiguous_flags = 0;
- if (!arg_end)
- arg_end = arg + strlen(arg);
-
for (; options->type != OPTION_END; options++) {
const char *rest, *long_name = options->long_name;
int flags = 0, opt_flags = 0;
diff --git a/pretty.c b/pretty.c
index 87db08b..99ba8ae 100644
--- a/pretty.c
+++ b/pretty.c
@@ -549,14 +549,13 @@ static char *get_header(const struct commit *commit,
const char *msg,
const char *line = msg;
while (line) {
- const char *eol = strchr(line, '\n'), *next;
+ const char *eol = strchrnul(line, '\n'), *next;
if (line == eol)
return NULL;
- if (!eol) {
+ if (!*eol) {
warning("malformed commit (header is missing newline):
%s",
sha1_to_hex(commit->object.sha1));
- eol = line + strlen(line);
next = NULL;
} else
next = eol + 1;
diff --git a/remote-testsvn.c b/remote-testsvn.c
index 078f1ff..6be55cb 100644
--- a/remote-testsvn.c
+++ b/remote-testsvn.c
@@ -78,8 +78,8 @@ static int parse_rev_note(const char *msg, struct rev_note
*res)
size_t len;
while (*msg) {
- end = strchr(msg, '\n');
- len = end ? end - msg : strlen(msg);
+ end = strchrnul(msg, '\n');
+ len = end - msg;
key = "Revision-number: ";
if (starts_with(msg, key)) {
diff --git a/ws.c b/ws.c
index b498d75..ea4b2b1 100644
--- a/ws.c
+++ b/ws.c
@@ -33,11 +33,8 @@ unsigned parse_whitespace_rule(const char *string)
int negated = 0;
string = string + strspn(string, ", \t\n\r");
- ep = strchr(string, ',');
- if (!ep)
- len = strlen(string);
- else
- len = ep - string;
+ ep = strchrnul(string, ',');
+ len = ep - string;
if (*string == '-') {
negated = 1;
--
1.7.9.5
--
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