use strchrnul() in place of strchr() and strlen()

Avoid scanning strings twice, once with strchr() and then with
strlen(), by using strchrnul().

Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Rohit Mani <rohit.mani@outlook.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/archive.c b/archive.c
index 346f3b2f1ab0d522638475b729274d992d5b82d5..d1962157c8865de32a59d6f364616758377ae560 100644 (file)
--- 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 0bbec432165874bd36b1f220301de7f1363626dc..2130f32e260c85f506d14ed9c22e6db978a17653 100644 (file)
--- 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 8e4a6a910519b2bb6d6a0337682ab402f2650997..015895bba6165a207b167e843b865777a86088bd 100644 (file)
--- 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 4fd18a3574a6e72bb7a299b26b3f97fa20b8052d..fb4738d373a5a1048c2ff388a729e6088515ca9b 100644 (file)
--- 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);
@@ -1576,11 +1573,8 @@ 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 7873cdec581eea66feab06c22b83ef7c27c7c5b6..e80b4af354f87caa7a5130660e9c9c530246b8be 100644 (file)
--- 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 7b8d3faa171309e84bff23c70206a9c8bd99cc71..a5fa0b8938cb2820635bbc620b1b26cc903a6c97 100644 (file)
--- 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 87db08bd749e74fef0b2372ab71ea98baf57b322..99ba8ae975c813ec4be46c5f43257f63c6b1950f 100644 (file)
--- 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 078f1ffa417092e1c783b16d782b2aa69417a591..6be55cbe9ed6cf4979ac0971c30f127c9667ab2e 100644 (file)
--- 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 b498d7599d5ac09c2688ee829b29aa36a866ac9c..ea4b2b1dfd64ce41f4752a93f4d5478c4e53deda 100644 (file)
--- 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;