LXR linux/tools/perf/util/path.c

   1/*
   2 * I'm tired of doing "vsnprintf()" etc just to open a
   3 * file, so here's a "return static buffer with printf"
   4 * interface for paths.
   5 *
   6 * It's obviously not thread-safe. Sue me. But it's quite
   7 * useful for doing things like
   8 *
   9 *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
  10 *
  11 * which is what it's designed for.
  12 */
  13#include "cache.h"
  14#include "path.h"
  15#include <linux/kernel.h>
  16#include <limits.h>
  17#include <stdio.h>
  18#include <sys/types.h>
  19#include <sys/stat.h>
  20#include <unistd.h>
  21
  22static char bad_path[] = "/bad-path/";
  23/*
  24 * One hack:
  25 */
  26static char *get_pathname(void)
  27{
  28        static char pathname_array[4][PATH_MAX];
  29        static int idx;
  30
  31        return pathname_array[3 & ++idx];
  32}
  33
  34static char *cleanup_path(char *path)
  35{
  36        /* Clean it up */
  37        if (!memcmp(path, "./", 2)) {
  38                path += 2;
  39                while (*path == '/')
  40                        path++;
  41        }
  42        return path;
  43}
  44
  45char *mkpath(const char *fmt, ...)
  46{
  47        va_list args;
  48        unsigned len;
  49        char *pathname = get_pathname();
  50
  51        va_start(args, fmt);
  52        len = vsnprintf(pathname, PATH_MAX, fmt, args);
  53        va_end(args);
  54        if (len >= PATH_MAX)
  55                return bad_path;
  56        return cleanup_path(pathname);
  57}
  58
  59int path__join(char *bf, size_t size, const char *path1, const char *path2)
  60{
  61        return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
  62}
  63
  64int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
  65{
  66        return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
  67                         path2, path2[0] ? "/" : "", path3);
  68}
  69
  70bool is_regular_file(const char *file)
  71{
  72        struct stat st;
  73
  74        if (stat(file, &st))
  75                return false;
  76
  77        return S_ISREG(st.st_mode);
  78}
  79