[PATCH v4 5/9] perf: Remove subcmd dependencies on strbuf

Josh Poimboeuf
2015-12-15T15:40:33Z

Introduce and use new astrcat() and astrcatf() functions which replace
the strbuf functionality for subcmd.

For now they duplicate strbuf's die-on-allocation-error policy.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
tools/perf/util/exec_cmd.c | 27 +++++++++++++-------------
tools/perf/util/help.c | 14 ++++++--------
tools/perf/util/parse-options.c | 42 +++++++++++++++++++++--------------------
tools/perf/util/subcmd-util.h | 24 +++++++++++++++++++++++
4 files changed, 66 insertions(+), 41 deletions(-)
create mode 100644 tools/perf/util/subcmd-util.h

diff --git a/tools/perf/util/exec_cmd.c b/tools/perf/util/exec_cmd.c
index b935e4c..65d86dc 100644
--- a/tools/perf/util/exec_cmd.c
+++ b/tools/perf/util/exec_cmd.c
@@ -4,6 +4,7 @@
#include "subcmd-config.h"

#include <string.h>
+#include "subcmd-util.h"

#define MAX_ARGS 32

@@ -21,14 +22,14 @@ void exec_cmd_init(const char *exec_name, const char *prefix,

char *system_path(const char *path)
{
- struct strbuf d = STRBUF_INIT;
+ char *buf = NULL;

if (is_absolute_path(path))
return strdup(path);

- strbuf_addf(&d, "%s/%s", subcmd_config.prefix, path);
- path = strbuf_detach(&d, NULL);
- return (char *)path;
+ astrcatf(&buf, "%s/%s", subcmd_config.prefix, path);
+
+ return buf;
}

const char *perf_extract_argv0_path(const char *argv0)
@@ -75,22 +76,22 @@ char *perf_exec_path(void)
return system_path(subcmd_config.exec_path);
}

-static void add_path(struct strbuf *out, const char *path)
+static void add_path(char **out, const char *path)
{
if (path && *path) {
if (is_absolute_path(path))
- strbuf_addstr(out, path);
+ astrcat(out, path);
else
- strbuf_addstr(out, make_nonrelative_path(path));
+ astrcat(out, make_nonrelative_path(path));

- strbuf_addch(out, PATH_SEP);
+ astrcat(out, ":");
}
}

void setup_path(void)
{
const char *old_path = getenv("PATH");
- struct strbuf new_path = STRBUF_INIT;
+ char *new_path = NULL;
char *tmp = perf_exec_path();

add_path(&new_path, tmp);
@@ -98,13 +99,13 @@ void setup_path(void)
free(tmp);

if (old_path)
- strbuf_addstr(&new_path, old_path);
+ astrcat(&new_path, old_path);
else
- strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
+ astrcat(&new_path, "/usr/local/bin:/usr/bin:/bin");

- setenv("PATH", new_path.buf, 1);
+ setenv("PATH", new_path, 1);

- strbuf_release(&new_path);
+ free(new_path);
}

static const char **prepare_perf_cmd(const char **argv)
diff --git a/tools/perf/util/help.c b/tools/perf/util/help.c
index 8d74f7d..8e5e0ce 100644
--- a/tools/perf/util/help.c
+++ b/tools/perf/util/help.c
@@ -2,6 +2,7 @@
#include "../builtin.h"
#include "exec_cmd.h"
#include "help.h"
+#include "subcmd-util.h"

void add_cmdname(struct cmdnames *cmds, const char *name, size_t len)
{
@@ -119,8 +120,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
int prefix_len;
DIR *dir = opendir(path);
struct dirent *de;
- struct strbuf buf = STRBUF_INIT;
- int len;
+ char *buf = NULL;

if (!dir)
return;
@@ -128,8 +128,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
prefix = "perf-";
prefix_len = strlen(prefix);

- strbuf_addf(&buf, "%s/", path);
- len = buf.len;
+ astrcatf(&buf, "%s/", path);

while ((de = readdir(dir)) != NULL) {
int entlen;
@@ -137,9 +136,8 @@ static void list_commands_in_dir(struct cmdnames *cmds,
if (prefixcmp(de->d_name, prefix))
continue;

- strbuf_setlen(&buf, len);
- strbuf_addstr(&buf, de->d_name);
- if (!is_executable(buf.buf))
+ astrcat(&buf, de->d_name);
+ if (!is_executable(buf))
continue;

entlen = strlen(de->d_name) - prefix_len;
@@ -149,7 +147,7 @@ static void list_commands_in_dir(struct cmdnames *cmds,
add_cmdname(cmds, de->d_name + prefix_len, entlen);
}
closedir(dir);
- strbuf_release(&buf);
+ free(buf);
}

void load_command_list(const char *prefix,
diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index da4ba21..c1da2a5 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -1,4 +1,5 @@
#include "util.h"
+#include "subcmd-util.h"
#include "parse-options.h"
#include "cache.h"
#include "header.h"
@@ -8,7 +9,7 @@
#define OPT_SHORT 1
#define OPT_UNSET 2

-static struct strbuf error_buf = STRBUF_INIT;
+char *error_buf;

static int opterror(const struct option *opt, const char *reason, int flags)
{
@@ -576,19 +577,18 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o

/* build usage string if it's not provided */
if (subcommands && !usagestr[0]) {
- struct strbuf buf = STRBUF_INIT;
+ char *buf = NULL;
+
+ astrcatf(&buf, "%s %s [<options>] {", subcmd_config.exec_name, argv[0]);

- strbuf_addf(&buf, "%s %s [<options>] {",
- subcmd_config.exec_name, argv[0]);
for (int i = 0; subcommands[i]; i++) {
if (i)
- strbuf_addstr(&buf, "|");
- strbuf_addstr(&buf, subcommands[i]);
+ astrcat(&buf, "|");
+ astrcat(&buf, subcommands[i]);
}
- strbuf_addstr(&buf, "}");
+ astrcat(&buf, "}");

- usagestr[0] = strdup(buf.buf);
- strbuf_release(&buf);
+ usagestr[0] = buf;
}

parse_options_start(&ctx, argc, argv, flags);
@@ -613,13 +613,11 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
putchar('\n');
exit(130);
default: /* PARSE_OPT_UNKNOWN */
- if (ctx.argv[0][1] == '-') {
- strbuf_addf(&error_buf, "unknown option `%s'",
- ctx.argv[0] + 2);
- } else {
- strbuf_addf(&error_buf, "unknown switch `%c'",
- *ctx.opt);
- }
+ if (ctx.argv[0][1] == '-')
+ astrcatf(&error_buf, "unknown option `%s'",
+ ctx.argv[0] + 2);
+ else
+ astrcatf(&error_buf, "unknown switch `%c'", *ctx.opt);
usage_with_options(usagestr, options);
}

@@ -806,9 +804,9 @@ static int usage_with_options_internal(const char * const *usagestr,

setup_pager();

- if (strbuf_avail(&error_buf)) {
- fprintf(stderr, " Error: %s\n", error_buf.buf);
- strbuf_release(&error_buf);
+ if (error_buf) {
+ fprintf(stderr, " Error: %s\n", error_buf);
+ zfree(&error_buf);
}

fprintf(stderr, "\n Usage: %s\n", *usagestr++);
@@ -852,11 +850,15 @@ void usage_with_options_msg(const char * const *usagestr,
const struct option *opts, const char *fmt, ...)
{
va_list ap;
+ char *tmp = error_buf;

va_start(ap, fmt);
- strbuf_addv(&error_buf, fmt, ap);
+ if (vasprintf(&error_buf, fmt, ap) == -1)
+ die("vasprintf failed");
va_end(ap);

+ free(tmp);
+
usage_with_options_internal(usagestr, opts, 0, NULL);
exit(129);
}
diff --git a/tools/perf/util/subcmd-util.h b/tools/perf/util/subcmd-util.h
new file mode 100644
index 0000000..98fb9f9
--- /dev/null
+++ b/tools/perf/util/subcmd-util.h
@@ -0,0 +1,24 @@
+#ifndef __PERF_SUBCMD_UTIL_H
+#define __PERF_SUBCMD_UTIL_H
+
+#include <stdio.h>
+
+#define astrcatf(out, fmt, ...) \
+({ \
+ char *tmp = *(out); \
+ if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
+ die("asprintf failed"); \
+ free(tmp); \
+})
+
+static inline void astrcat(char **out, const char *add)
+{
+ char *tmp = *out;
+
+ if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
+ die("asprintf failed");
+
+ free(tmp);
+}
+
+#endif /* __PERF_SUBCMD_UTIL_H */
--
2.4.3