mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
864709302a
Several people have suggested that 'perf' has become a full-fledged tool that should be moved out of Documentation/. Move it to the (new) tools/ directory. Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
354 lines
7.8 KiB
C
354 lines
7.8 KiB
C
/*
|
|
* I'm tired of doing "vsnprintf()" etc just to open a
|
|
* file, so here's a "return static buffer with printf"
|
|
* interface for paths.
|
|
*
|
|
* It's obviously not thread-safe. Sue me. But it's quite
|
|
* useful for doing things like
|
|
*
|
|
* f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
|
|
*
|
|
* which is what it's designed for.
|
|
*/
|
|
#include "cache.h"
|
|
|
|
static char bad_path[] = "/bad-path/";
|
|
/*
|
|
* Two hacks:
|
|
*/
|
|
|
|
static char *get_perf_dir(void)
|
|
{
|
|
return ".";
|
|
}
|
|
|
|
size_t strlcpy(char *dest, const char *src, size_t size)
|
|
{
|
|
size_t ret = strlen(src);
|
|
|
|
if (size) {
|
|
size_t len = (ret >= size) ? size - 1 : ret;
|
|
memcpy(dest, src, len);
|
|
dest[len] = '\0';
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
|
|
static char *get_pathname(void)
|
|
{
|
|
static char pathname_array[4][PATH_MAX];
|
|
static int index;
|
|
return pathname_array[3 & ++index];
|
|
}
|
|
|
|
static char *cleanup_path(char *path)
|
|
{
|
|
/* Clean it up */
|
|
if (!memcmp(path, "./", 2)) {
|
|
path += 2;
|
|
while (*path == '/')
|
|
path++;
|
|
}
|
|
return path;
|
|
}
|
|
|
|
char *mksnpath(char *buf, size_t n, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
unsigned len;
|
|
|
|
va_start(args, fmt);
|
|
len = vsnprintf(buf, n, fmt, args);
|
|
va_end(args);
|
|
if (len >= n) {
|
|
strlcpy(buf, bad_path, n);
|
|
return buf;
|
|
}
|
|
return cleanup_path(buf);
|
|
}
|
|
|
|
static char *perf_vsnpath(char *buf, size_t n, const char *fmt, va_list args)
|
|
{
|
|
const char *perf_dir = get_perf_dir();
|
|
size_t len;
|
|
|
|
len = strlen(perf_dir);
|
|
if (n < len + 1)
|
|
goto bad;
|
|
memcpy(buf, perf_dir, len);
|
|
if (len && !is_dir_sep(perf_dir[len-1]))
|
|
buf[len++] = '/';
|
|
len += vsnprintf(buf + len, n - len, fmt, args);
|
|
if (len >= n)
|
|
goto bad;
|
|
return cleanup_path(buf);
|
|
bad:
|
|
strlcpy(buf, bad_path, n);
|
|
return buf;
|
|
}
|
|
|
|
char *perf_snpath(char *buf, size_t n, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
(void)perf_vsnpath(buf, n, fmt, args);
|
|
va_end(args);
|
|
return buf;
|
|
}
|
|
|
|
char *perf_pathdup(const char *fmt, ...)
|
|
{
|
|
char path[PATH_MAX];
|
|
va_list args;
|
|
va_start(args, fmt);
|
|
(void)perf_vsnpath(path, sizeof(path), fmt, args);
|
|
va_end(args);
|
|
return xstrdup(path);
|
|
}
|
|
|
|
char *mkpath(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
unsigned len;
|
|
char *pathname = get_pathname();
|
|
|
|
va_start(args, fmt);
|
|
len = vsnprintf(pathname, PATH_MAX, fmt, args);
|
|
va_end(args);
|
|
if (len >= PATH_MAX)
|
|
return bad_path;
|
|
return cleanup_path(pathname);
|
|
}
|
|
|
|
char *perf_path(const char *fmt, ...)
|
|
{
|
|
const char *perf_dir = get_perf_dir();
|
|
char *pathname = get_pathname();
|
|
va_list args;
|
|
unsigned len;
|
|
|
|
len = strlen(perf_dir);
|
|
if (len > PATH_MAX-100)
|
|
return bad_path;
|
|
memcpy(pathname, perf_dir, len);
|
|
if (len && perf_dir[len-1] != '/')
|
|
pathname[len++] = '/';
|
|
va_start(args, fmt);
|
|
len += vsnprintf(pathname + len, PATH_MAX - len, fmt, args);
|
|
va_end(args);
|
|
if (len >= PATH_MAX)
|
|
return bad_path;
|
|
return cleanup_path(pathname);
|
|
}
|
|
|
|
|
|
/* perf_mkstemp() - create tmp file honoring TMPDIR variable */
|
|
int perf_mkstemp(char *path, size_t len, const char *template)
|
|
{
|
|
const char *tmp;
|
|
size_t n;
|
|
|
|
tmp = getenv("TMPDIR");
|
|
if (!tmp)
|
|
tmp = "/tmp";
|
|
n = snprintf(path, len, "%s/%s", tmp, template);
|
|
if (len <= n) {
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
return mkstemp(path);
|
|
}
|
|
|
|
|
|
const char *make_relative_path(const char *abs, const char *base)
|
|
{
|
|
static char buf[PATH_MAX + 1];
|
|
int baselen;
|
|
if (!base)
|
|
return abs;
|
|
baselen = strlen(base);
|
|
if (prefixcmp(abs, base))
|
|
return abs;
|
|
if (abs[baselen] == '/')
|
|
baselen++;
|
|
else if (base[baselen - 1] != '/')
|
|
return abs;
|
|
strcpy(buf, abs + baselen);
|
|
return buf;
|
|
}
|
|
|
|
/*
|
|
* It is okay if dst == src, but they should not overlap otherwise.
|
|
*
|
|
* Performs the following normalizations on src, storing the result in dst:
|
|
* - Ensures that components are separated by '/' (Windows only)
|
|
* - Squashes sequences of '/'.
|
|
* - Removes "." components.
|
|
* - Removes ".." components, and the components the precede them.
|
|
* Returns failure (non-zero) if a ".." component appears as first path
|
|
* component anytime during the normalization. Otherwise, returns success (0).
|
|
*
|
|
* Note that this function is purely textual. It does not follow symlinks,
|
|
* verify the existence of the path, or make any system calls.
|
|
*/
|
|
int normalize_path_copy(char *dst, const char *src)
|
|
{
|
|
char *dst0;
|
|
|
|
if (has_dos_drive_prefix(src)) {
|
|
*dst++ = *src++;
|
|
*dst++ = *src++;
|
|
}
|
|
dst0 = dst;
|
|
|
|
if (is_dir_sep(*src)) {
|
|
*dst++ = '/';
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
}
|
|
|
|
for (;;) {
|
|
char c = *src;
|
|
|
|
/*
|
|
* A path component that begins with . could be
|
|
* special:
|
|
* (1) "." and ends -- ignore and terminate.
|
|
* (2) "./" -- ignore them, eat slash and continue.
|
|
* (3) ".." and ends -- strip one and terminate.
|
|
* (4) "../" -- strip one, eat slash and continue.
|
|
*/
|
|
if (c == '.') {
|
|
if (!src[1]) {
|
|
/* (1) */
|
|
src++;
|
|
} else if (is_dir_sep(src[1])) {
|
|
/* (2) */
|
|
src += 2;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
continue;
|
|
} else if (src[1] == '.') {
|
|
if (!src[2]) {
|
|
/* (3) */
|
|
src += 2;
|
|
goto up_one;
|
|
} else if (is_dir_sep(src[2])) {
|
|
/* (4) */
|
|
src += 3;
|
|
while (is_dir_sep(*src))
|
|
src++;
|
|
goto up_one;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* copy up to the next '/', and eat all '/' */
|
|
while ((c = *src++) != '\0' && !is_dir_sep(c))
|
|
*dst++ = c;
|
|
if (is_dir_sep(c)) {
|
|
*dst++ = '/';
|
|
while (is_dir_sep(c))
|
|
c = *src++;
|
|
src--;
|
|
} else if (!c)
|
|
break;
|
|
continue;
|
|
|
|
up_one:
|
|
/*
|
|
* dst0..dst is prefix portion, and dst[-1] is '/';
|
|
* go up one level.
|
|
*/
|
|
dst--; /* go to trailing '/' */
|
|
if (dst <= dst0)
|
|
return -1;
|
|
/* Windows: dst[-1] cannot be backslash anymore */
|
|
while (dst0 < dst && dst[-1] != '/')
|
|
dst--;
|
|
}
|
|
*dst = '\0';
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* path = Canonical absolute path
|
|
* prefix_list = Colon-separated list of absolute paths
|
|
*
|
|
* Determines, for each path in prefix_list, whether the "prefix" really
|
|
* is an ancestor directory of path. Returns the length of the longest
|
|
* ancestor directory, excluding any trailing slashes, or -1 if no prefix
|
|
* is an ancestor. (Note that this means 0 is returned if prefix_list is
|
|
* "/".) "/foo" is not considered an ancestor of "/foobar". Directories
|
|
* are not considered to be their own ancestors. path must be in a
|
|
* canonical form: empty components, or "." or ".." components are not
|
|
* allowed. prefix_list may be null, which is like "".
|
|
*/
|
|
int longest_ancestor_length(const char *path, const char *prefix_list)
|
|
{
|
|
char buf[PATH_MAX+1];
|
|
const char *ceil, *colon;
|
|
int len, max_len = -1;
|
|
|
|
if (prefix_list == NULL || !strcmp(path, "/"))
|
|
return -1;
|
|
|
|
for (colon = ceil = prefix_list; *colon; ceil = colon+1) {
|
|
for (colon = ceil; *colon && *colon != PATH_SEP; colon++);
|
|
len = colon - ceil;
|
|
if (len == 0 || len > PATH_MAX || !is_absolute_path(ceil))
|
|
continue;
|
|
strlcpy(buf, ceil, len+1);
|
|
if (normalize_path_copy(buf, buf) < 0)
|
|
continue;
|
|
len = strlen(buf);
|
|
if (len > 0 && buf[len-1] == '/')
|
|
buf[--len] = '\0';
|
|
|
|
if (!strncmp(path, buf, len) &&
|
|
path[len] == '/' &&
|
|
len > max_len) {
|
|
max_len = len;
|
|
}
|
|
}
|
|
|
|
return max_len;
|
|
}
|
|
|
|
/* strip arbitrary amount of directory separators at end of path */
|
|
static inline int chomp_trailing_dir_sep(const char *path, int len)
|
|
{
|
|
while (len && is_dir_sep(path[len - 1]))
|
|
len--;
|
|
return len;
|
|
}
|
|
|
|
/*
|
|
* If path ends with suffix (complete path components), returns the
|
|
* part before suffix (sans trailing directory separators).
|
|
* Otherwise returns NULL.
|
|
*/
|
|
char *strip_path_suffix(const char *path, const char *suffix)
|
|
{
|
|
int path_len = strlen(path), suffix_len = strlen(suffix);
|
|
|
|
while (suffix_len) {
|
|
if (!path_len)
|
|
return NULL;
|
|
|
|
if (is_dir_sep(path[path_len - 1])) {
|
|
if (!is_dir_sep(suffix[suffix_len - 1]))
|
|
return NULL;
|
|
path_len = chomp_trailing_dir_sep(path, path_len);
|
|
suffix_len = chomp_trailing_dir_sep(suffix, suffix_len);
|
|
}
|
|
else if (path[--path_len] != suffix[--suffix_len])
|
|
return NULL;
|
|
}
|
|
|
|
if (path_len && !is_dir_sep(path[path_len - 1]))
|
|
return NULL;
|
|
return xstrndup(path, chomp_trailing_dir_sep(path, path_len));
|
|
}
|