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 "util.h"
  15#include <limits.h>
  16
  17static char bad_path[] = "/bad-path/";
  18/*
  19 * One hack:
  20 */
  21static char *get_pathname(void)
  22{
  23        static char pathname_array[4][PATH_MAX];
  24        static int idx;
  25
  26        return pathname_array[3 & ++idx];
  27}
  28
  29static char *cleanup_path(char *path)
  30{
  31        /* Clean it up */
  32        if (!memcmp(path, "./", 2)) {
  33                path += 2;
  34                while (*path == '/')
  35                        path++;
  36        }
  37        return path;
  38}
  39
  40char *mkpath(const char *fmt, ...)
  41{
  42        va_list args;
  43        unsigned len;
  44        char *pathname = get_pathname();
  45
  46        va_start(args, fmt);
  47        len = vsnprintf(pathname, PATH_MAX, fmt, args);
  48        va_end(args);
  49        if (len >= PATH_MAX)
  50                return bad_path;
  51        return cleanup_path(pathname);
  52}
  53