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libsubcmd: Avoid two path statics, removing 8192 bytes from .bss

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Use a single stack allocated buffer and avoid 8,192 bytes in .bss.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Ross Zwisler <zwisler@chromium.org>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tiezhu Yang <yangtiezhu@loongson.cn>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/r/20230526183401.2326121-17-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2023-05-26 11:34:01 -07:00 committed by Arnaldo Carvalho de Melo
parent f50b8357f8
commit 2003237687
1 changed files with 20 additions and 15 deletions
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35
tools/lib/subcmd/exec-cmd.c
View file

@ -36,38 +36,40 @@ static int is_absolute_path(const char *path)
return path[0] == '/';
}
static const char *get_pwd_cwd(void)
static const char *get_pwd_cwd(char *buf, size_t sz)
{
static char cwd[PATH_MAX + 1];
char *pwd;
struct stat cwd_stat, pwd_stat;
if (getcwd(cwd, PATH_MAX) == NULL)
if (getcwd(buf, sz) == NULL)
return NULL;
pwd = getenv("PWD");
if (pwd && strcmp(pwd, cwd)) {
stat(cwd, &cwd_stat);
if (pwd && strcmp(pwd, buf)) {
stat(buf, &cwd_stat);
if (!stat(pwd, &pwd_stat) &&
pwd_stat.st_dev == cwd_stat.st_dev &&
pwd_stat.st_ino == cwd_stat.st_ino) {
strlcpy(cwd, pwd, PATH_MAX);
strlcpy(buf, pwd, sz);
}
}
return cwd;
return buf;
}
static const char *make_nonrelative_path(const char *path)
static const char *make_nonrelative_path(char *buf, size_t sz, const char *path)
{
static char buf[PATH_MAX + 1];
if (is_absolute_path(path)) {
if (strlcpy(buf, path, PATH_MAX) >= PATH_MAX)
if (strlcpy(buf, path, sz) >= sz)
die("Too long path: %.*s", 60, path);
} else {
const char *cwd = get_pwd_cwd();
const char *cwd = get_pwd_cwd(buf, sz);
if (!cwd)
die("Cannot determine the current working directory");
if (snprintf(buf, PATH_MAX, "%s/%s", cwd, path) >= PATH_MAX)
if (strlen(cwd) + strlen(path) + 2 >= sz)
die("Too long path: %.*s", 60, path);
strcat(buf, "/");
strcat(buf, path);
}
return buf;
}
@ -133,8 +135,11 @@ static void add_path(char **out, const char *path)
if (path && *path) {
if (is_absolute_path(path))
astrcat(out, path);
else
astrcat(out, make_nonrelative_path(path));
else {
char buf[PATH_MAX];
astrcat(out, make_nonrelative_path(buf, sizeof(buf), path));
}
astrcat(out, ":");
}