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Subject[PATCH 15/40] tools include: Adopt strstarts() from the kernel
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

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>
---
tools/include/linux/string.h | 12 ++++++++++--
tools/lib/string.c | 9 ---------
tools/lib/subcmd/help.c | 2 +-
tools/lib/subcmd/parse-options.c | 18 +++++++++---------
tools/perf/builtin-config.c | 3 ++-
tools/perf/builtin-ftrace.c | 2 +-
tools/perf/builtin-help.c | 6 +++---
tools/perf/perf.c | 16 ++++++++--------
tools/perf/ui/browser.c | 3 ++-
tools/perf/ui/browsers/annotate.c | 3 ++-
tools/perf/ui/stdio/hist.c | 3 ++-
tools/perf/util/bpf-loader.c | 2 +-
tools/perf/util/callchain.c | 2 +-
tools/perf/util/config.c | 13 +++++++------
tools/perf/util/llvm-utils.c | 2 +-
15 files changed, 50 insertions(+), 46 deletions(-)

diff --git a/tools/include/linux/string.h b/tools/include/linux/string.h
index d62b56cf8c12..a30fad536f52 100644
--- 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 8e678af1c6ee..bd239bc1d557 100644
--- 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 ba970a73d053..0310520f918e 100644
--- 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 359bfa77f39c..2bd6fd0c1d40 100644
--- a/tools/lib/subcmd/parse-options.c
+++ b/tools/lib/subcmd/parse-options.c
@@ -368,7 +368,7 @@ static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
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 @@ static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
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 @@ static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
continue;
}
/* negated and abbreviated very much? */
- if (!prefixcmp("no-", arg)) {
+ if (strstarts("no-", arg)) {
flags |= OPT_UNSET;
goto is_abbreviated;
}
@@ -416,7 +416,7 @@ static int parse_long_opt(struct parse_opt_ctx_t *p, const char *arg,
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 @@ int parse_options_usage(const char * const *usagestr,
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 ece45582a48d..3ddcc6e2abeb 100644
--- 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 dd26c62c9893..25a42acabee1 100644
--- 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 530a7f2fa0f3..dbe4e4153bcf 100644
--- 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 628a5e412cb1..e0279babe0c0 100644
--- 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 f73f3f13e01d..d0c2007c307b 100644
--- 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 8d3f6f53c122..6794a8bec404 100644
--- 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 2df8eb1ed3c0..5c95b8301c67 100644
--- 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 4bd2d1d882af..4a1264c66101 100644
--- 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 22d413ae6025..02130e2e72c7 100644
--- 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 31a7dea248d0..bc75596f9e79 100644
--- 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 c6a15f204c03..209b0c82eff4 100644
--- 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;

--
2.9.4
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