tools include: Adopt strstarts() from the kernel

Replacing prefixcmp(), same purpose, inverted result, so standardize on
the kernel variant, to reduce silly differences among tools/ and the
kernel sources, making it easier for people to work in both codebases.

And then doing:

	if (strstarts(option, "no-"))

Looks clearer than doing:

	if (!prefixcmp(option, "no-"))

To figure out if option starts witn "no-".

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-kaei42gi7lpa8subwtv7eug8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
index d62b56c..a30fad5 100644 (file)
--- a/tools/include/linux/string.h
+++ b/tools/include/linux/string.h
@@ -1,8 +1,8 @@
 #ifndef _TOOLS_LINUX_STRING_H_
 #define _TOOLS_LINUX_STRING_H_
 
-
 #include <linux/types.h>       /* for size_t */
+#include <string.h>
 
 void *memdup(const void *src, size_t len);
 
@@ -18,6 +18,14 @@ extern size_t strlcpy(char *dest, const char *src, size_t size);
 
 char *str_error_r(int errnum, char *buf, size_t buflen);
 
-int prefixcmp(const char *str, const char *prefix);
+/**
+ * strstarts - does @str start with @prefix?
+ * @str: string to examine
+ * @prefix: prefix to look for.
+ */
+static inline bool strstarts(const char *str, const char *prefix)
+{
+       return strncmp(str, prefix, strlen(prefix)) == 0;
+}
 
 #endif /* _LINUX_STRING_H_ */

diff --git a/tools/lib/string.c b/tools/lib/string.c
index 8e678af..bd239bc 100644 (file)
--- a/tools/lib/string.c
+++ b/tools/lib/string.c
@@ -87,12 +87,3 @@ size_t __weak strlcpy(char *dest, const char *src, size_t size)
        }
        return ret;
 }
-
-int prefixcmp(const char *str, const char *prefix)
-{
-       for (; ; str++, prefix++)
-               if (!*prefix)
-                       return 0;
-               else if (*str != *prefix)
-                       return (unsigned char)*prefix - (unsigned char)*str;
-}

diff --git a/tools/lib/subcmd/help.c b/tools/lib/subcmd/help.c
index ba970a7..0310520 100644 (file)
--- a/tools/lib/subcmd/help.c
+++ b/tools/lib/subcmd/help.c
@@ -171,7 +171,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
        while ((de = readdir(dir)) != NULL) {
                int entlen;
 
-               if (prefixcmp(de->d_name, prefix))
+               if (!strstarts(de->d_name, prefix))
                        continue;
 
                astrcat(&buf, de->d_name);

diff --git a/tools/lib/subcmd/parse-options.c b/tools/lib/subcmd/parse-options.c
index 359bfa7..2bd6fd0 100644 (file)
--- a/tools/lib/subcmd/parse-options.c
+++ b/tools/lib/subcmd/parse-options.c
@@ -368,7 +368,7 @@ retry:
                        return 0;
                }
                if (!rest) {
-                       if (!prefixcmp(options->long_name, "no-")) {
+                       if (strstarts(options->long_name, "no-")) {
                                /*
                                 * The long name itself starts with "no-", so
                                 * accept the option without "no-" so that users
@@ -381,7 +381,7 @@ retry:
                                        goto match;
                                }
                                /* Abbreviated case */
-                               if (!prefixcmp(options->long_name + 3, arg)) {
+                               if (strstarts(options->long_name + 3, arg)) {
                                        flags |= OPT_UNSET;
                                        goto is_abbreviated;
                                }
@@ -406,7 +406,7 @@ is_abbreviated:
                                continue;
                        }
                        /* negated and abbreviated very much? */
-                       if (!prefixcmp("no-", arg)) {
+                       if (strstarts("no-", arg)) {
                                flags |= OPT_UNSET;
                                goto is_abbreviated;
                        }
@@ -416,7 +416,7 @@ is_abbreviated:
                        flags |= OPT_UNSET;
                        rest = skip_prefix(arg + 3, options->long_name);
                        /* abbreviated and negated? */
-                       if (!rest && !prefixcmp(options->long_name, arg + 3))
+                       if (!rest && strstarts(options->long_name, arg + 3))
                                goto is_abbreviated;
                        if (!rest)
                                continue;
@@ -456,7 +456,7 @@ static void check_typos(const char *arg, const struct option *options)
        if (strlen(arg) < 3)
                return;
 
-       if (!prefixcmp(arg, "no-")) {
+       if (strstarts(arg, "no-")) {
                fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
                exit(129);
        }
@@ -464,7 +464,7 @@ static void check_typos(const char *arg, const struct option *options)
        for (; options->type != OPTION_END; options++) {
                if (!options->long_name)
                        continue;
-               if (!prefixcmp(options->long_name, arg)) {
+               if (strstarts(options->long_name, arg)) {
                        fprintf(stderr, " Error: did you mean `--%s` (with two dashes ?)", arg);
                        exit(129);
                }
@@ -933,10 +933,10 @@ opt:
                if (opts->long_name == NULL)
                        continue;
 
-               if (!prefixcmp(opts->long_name, optstr))
+               if (strstarts(opts->long_name, optstr))
                        print_option_help(opts, 0);
-               if (!prefixcmp("no-", optstr) &&
-                   !prefixcmp(opts->long_name, optstr + 3))
+               if (strstarts("no-", optstr) &&
+                   strstarts(opts->long_name, optstr + 3))
                        print_option_help(opts, 0);
        }
 

diff --git a/tools/perf/builtin-config.c b/tools/perf/builtin-config.c
index ece4558..3ddcc6e 100644 (file)
--- a/tools/perf/builtin-config.c
+++ b/tools/perf/builtin-config.c
@@ -13,6 +13,7 @@
 #include "util/util.h"
 #include "util/debug.h"
 #include "util/config.h"
+#include <linux/string.h>
 
 static bool use_system_config, use_user_config;
 
@@ -79,7 +80,7 @@ static int show_spec_config(struct perf_config_set *set, const char *var)
                return -1;
 
        perf_config_items__for_each_entry(&set->sections, section) {
-               if (prefixcmp(var, section->name) != 0)
+               if (!strstarts(var, section->name))
                        continue;
 
                perf_config_items__for_each_entry(&section->items, item) {

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index dd26c62..25a42ac 100644 (file)
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -381,7 +381,7 @@ static int perf_ftrace_config(const char *var, const char *value, void *cb)
 {
        struct perf_ftrace *ftrace = cb;
 
-       if (prefixcmp(var, "ftrace."))
+       if (!strstarts(var, "ftrace."))
                return 0;
 
        if (strcmp(var, "ftrace.tracer"))

diff --git a/tools/perf/builtin-help.c b/tools/perf/builtin-help.c
index 530a7f2..dbe4e41 100644 (file)
--- a/tools/perf/builtin-help.c
+++ b/tools/perf/builtin-help.c
@@ -90,7 +90,7 @@ static int check_emacsclient_version(void)
         */
        finish_command(&ec_process);
 
-       if (prefixcmp(buffer.buf, "emacsclient")) {
+       if (!strstarts(buffer.buf, "emacsclient")) {
                fprintf(stderr, "Failed to parse emacsclient version.\n");
                goto out;
        }
@@ -283,7 +283,7 @@ static int perf_help_config(const char *var, const char *value, void *cb)
                add_man_viewer(value);
                return 0;
        }
-       if (!prefixcmp(var, "man."))
+       if (!strstarts(var, "man."))
                return add_man_viewer_info(var, value);
 
        return 0;
@@ -313,7 +313,7 @@ static const char *cmd_to_page(const char *perf_cmd)
 
        if (!perf_cmd)
                return "perf";
-       else if (!prefixcmp(perf_cmd, "perf"))
+       else if (!strstarts(perf_cmd, "perf"))
                return perf_cmd;
 
        return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;

diff --git a/tools/perf/perf.c b/tools/perf/perf.c
index 628a5e4..e0279ba 100644 (file)
--- a/tools/perf/perf.c
+++ b/tools/perf/perf.c
@@ -89,7 +89,7 @@ struct pager_config {
 static int pager_command_config(const char *var, const char *value, void *data)
 {
        struct pager_config *c = data;
-       if (!prefixcmp(var, "pager.") && !strcmp(var + 6, c->cmd))
+       if (strstarts(var, "pager.") && !strcmp(var + 6, c->cmd))
                c->val = perf_config_bool(var, value);
        return 0;
 }
@@ -108,9 +108,9 @@ static int check_pager_config(const char *cmd)
 static int browser_command_config(const char *var, const char *value, void *data)
 {
        struct pager_config *c = data;
-       if (!prefixcmp(var, "tui.") && !strcmp(var + 4, c->cmd))
+       if (strstarts(var, "tui.") && !strcmp(var + 4, c->cmd))
                c->val = perf_config_bool(var, value);
-       if (!prefixcmp(var, "gtk.") && !strcmp(var + 4, c->cmd))
+       if (strstarts(var, "gtk.") && !strcmp(var + 4, c->cmd))
                c->val = perf_config_bool(var, value) ? 2 : 0;
        return 0;
 }
@@ -192,7 +192,7 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
                /*
                 * Check remaining flags.
                 */
-               if (!prefixcmp(cmd, CMD_EXEC_PATH)) {
+               if (strstarts(cmd, CMD_EXEC_PATH)) {
                        cmd += strlen(CMD_EXEC_PATH);
                        if (*cmd == '=')
                                set_argv_exec_path(cmd + 1);
@@ -229,7 +229,7 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
                                *envchanged = 1;
                        (*argv)++;
                        (*argc)--;
-               } else if (!prefixcmp(cmd, CMD_DEBUGFS_DIR)) {
+               } else if (strstarts(cmd, CMD_DEBUGFS_DIR)) {
                        tracing_path_set(cmd + strlen(CMD_DEBUGFS_DIR));
                        fprintf(stderr, "dir: %s\n", tracing_path);
                        if (envchanged)
@@ -470,14 +470,14 @@ int main(int argc, const char **argv)
         * So we just directly call the internal command handler, and
         * die if that one cannot handle it.
         */
-       if (!prefixcmp(cmd, "perf-")) {
+       if (strstarts(cmd, "perf-")) {
                cmd += 5;
                argv[0] = cmd;
                handle_internal_command(argc, argv);
                fprintf(stderr, "cannot handle %s internally", cmd);
                goto out;
        }
-       if (!prefixcmp(cmd, "trace")) {
+       if (strstarts(cmd, "trace")) {
 #ifdef HAVE_LIBAUDIT_SUPPORT
                setup_path();
                argv[0] = "trace";
@@ -495,7 +495,7 @@ int main(int argc, const char **argv)
        commit_pager_choice();
 
        if (argc > 0) {
-               if (!prefixcmp(argv[0], "--"))
+               if (strstarts(argv[0], "--"))
                        argv[0] += 2;
        } else {
                /* The user didn't specify a command; give them help */

diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
index f73f3f1..d0c2007 100644 (file)
--- a/tools/perf/ui/browser.c
+++ b/tools/perf/ui/browser.c
@@ -8,6 +8,7 @@
 #include <linux/compiler.h>
 #include <linux/list.h>
 #include <linux/rbtree.h>
+#include <linux/string.h>
 #include <stdlib.h>
 #include <sys/ttydefaults.h>
 #include "browser.h"
@@ -563,7 +564,7 @@ static int ui_browser__color_config(const char *var, const char *value,
        int i;
 
        /* same dir for all commands */
-       if (prefixcmp(var, "colors.") != 0)
+       if (!strstarts(var, "colors.") != 0)
                return 0;
 
        for (i = 0; ui_browser__colorsets[i].name != NULL; ++i) {

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 8d3f6f5..6794a8b 100644 (file)
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -13,6 +13,7 @@
 #include <inttypes.h>
 #include <pthread.h>
 #include <linux/kernel.h>
+#include <linux/string.h>
 #include <sys/ttydefaults.h>
 
 struct disasm_line_samples {
@@ -1198,7 +1199,7 @@ static int annotate__config(const char *var, const char *value,
        struct annotate_config *cfg;
        const char *name;
 
-       if (prefixcmp(var, "annotate.") != 0)
+       if (!strstarts(var, "annotate."))
                return 0;
 
        name = var + 9;

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 2df8eb1..5c95b83 100644 (file)
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <linux/string.h>
 
 #include "../../util/util.h"
 #include "../../util/hist.h"
@@ -292,7 +293,7 @@ static size_t callchain__fprintf_graph(FILE *fp, struct rb_root *root,
                         * displayed twice.
                         */
                        if (!i++ && field_order == NULL &&
-                           sort_order && !prefixcmp(sort_order, "sym"))
+                           sort_order && strstarts(sort_order, "sym"))
                                continue;
 
                        if (!printed) {

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 4bd2d1d..4a1264c 100644 (file)
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -1246,7 +1246,7 @@ int bpf__config_obj(struct bpf_object *obj,
        if (!obj || !term || !term->config)
                return -EINVAL;
 
-       if (!prefixcmp(term->config, "map:")) {
+       if (strstarts(term->config, "map:")) {
                key_scan_pos = sizeof("map:") - 1;
                err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
                goto out;

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 22d413a..02130e2 100644 (file)
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -304,7 +304,7 @@ int perf_callchain_config(const char *var, const char *value)
 {
        char *endptr;
 
-       if (prefixcmp(var, "call-graph."))
+       if (!strstarts(var, "call-graph."))
                return 0;
        var += sizeof("call-graph.") - 1;
 

diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 31a7dea..bc75596 100644 (file)
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -19,6 +19,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <linux/string.h>
 
 #include "sane_ctype.h"
 
@@ -433,22 +434,22 @@ static int perf_ui_config(const char *var, const char *value)
 int perf_default_config(const char *var, const char *value,
                        void *dummy __maybe_unused)
 {
-       if (!prefixcmp(var, "core."))
+       if (strstarts(var, "core."))
                return perf_default_core_config(var, value);
 
-       if (!prefixcmp(var, "hist."))
+       if (strstarts(var, "hist."))
                return perf_hist_config(var, value);
 
-       if (!prefixcmp(var, "ui."))
+       if (strstarts(var, "ui."))
                return perf_ui_config(var, value);
 
-       if (!prefixcmp(var, "call-graph."))
+       if (strstarts(var, "call-graph."))
                return perf_callchain_config(var, value);
 
-       if (!prefixcmp(var, "llvm."))
+       if (strstarts(var, "llvm."))
                return perf_llvm_config(var, value);
 
-       if (!prefixcmp(var, "buildid."))
+       if (strstarts(var, "buildid."))
                return perf_buildid_config(var, value);
 
        /* Add other config variables here. */

diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c
index c6a15f2..209b0c8 100644 (file)
--- a/tools/perf/util/llvm-utils.c
+++ b/tools/perf/util/llvm-utils.c
@@ -33,7 +33,7 @@ struct llvm_param llvm_param = {
 
 int perf_llvm_config(const char *var, const char *value)
 {
-       if (prefixcmp(var, "llvm."))
+       if (!strstarts(var, "llvm."))
                return 0;
        var += sizeof("llvm.") - 1;