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Linux/tools/perf/util/path.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * I'm tired of doing "vsnprintf()" etc just to open a
  4  * file, so here's a "return static buffer with printf"
  5  * interface for paths.
  6  *
  7  * It's obviously not thread-safe. Sue me. But it's quite
  8  * useful for doing things like
  9  *
 10  *   f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
 11  *
 12  * which is what it's designed for.
 13  */
 14 #include "path.h"
 15 #include "cache.h"
 16 #include <linux/kernel.h>
 17 #include <limits.h>
 18 #include <stdio.h>
 19 #include <string.h>
 20 #include <sys/types.h>
 21 #include <sys/stat.h>
 22 #include <dirent.h>
 23 #include <unistd.h>
 24 
 25 static char bad_path[] = "/bad-path/";
 26 /*
 27  * One hack:
 28  */
 29 static char *get_pathname(void)
 30 {
 31         static char pathname_array[4][PATH_MAX];
 32         static int idx;
 33 
 34         return pathname_array[3 & ++idx];
 35 }
 36 
 37 static char *cleanup_path(char *path)
 38 {
 39         /* Clean it up */
 40         if (!memcmp(path, "./", 2)) {
 41                 path += 2;
 42                 while (*path == '/')
 43                         path++;
 44         }
 45         return path;
 46 }
 47 
 48 char *mkpath(const char *fmt, ...)
 49 {
 50         va_list args;
 51         unsigned len;
 52         char *pathname = get_pathname();
 53 
 54         va_start(args, fmt);
 55         len = vsnprintf(pathname, PATH_MAX, fmt, args);
 56         va_end(args);
 57         if (len >= PATH_MAX)
 58                 return bad_path;
 59         return cleanup_path(pathname);
 60 }
 61 
 62 int path__join(char *bf, size_t size, const char *path1, const char *path2)
 63 {
 64         return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
 65 }
 66 
 67 int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
 68 {
 69         return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
 70                          path2, path2[0] ? "/" : "", path3);
 71 }
 72 
 73 bool is_regular_file(const char *file)
 74 {
 75         struct stat st;
 76 
 77         if (stat(file, &st))
 78                 return false;
 79 
 80         return S_ISREG(st.st_mode);
 81 }
 82 
 83 /* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
 84 bool is_directory(const char *base_path, const struct dirent *dent)
 85 {
 86         char path[PATH_MAX];
 87         struct stat st;
 88 
 89         sprintf(path, "%s/%s", base_path, dent->d_name);
 90         if (stat(path, &st))
 91                 return false;
 92 
 93         return S_ISDIR(st.st_mode);
 94 }
 95 

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