95 строки
1.9 KiB
C
95 строки
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* I'm tired of doing "vsnprintf()" etc just to open a
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* file, so here's a "return static buffer with printf"
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* interface for paths.
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*
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* It's obviously not thread-safe. Sue me. But it's quite
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* useful for doing things like
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*
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* f = open(mkpath("%s/%s.perf", base, name), O_RDONLY);
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*
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* which is what it's designed for.
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*/
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#include "path.h"
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#include "cache.h"
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#include <linux/kernel.h>
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#include <limits.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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static char bad_path[] = "/bad-path/";
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/*
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* One hack:
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*/
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static char *get_pathname(void)
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{
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static char pathname_array[4][PATH_MAX];
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static int idx;
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return pathname_array[3 & ++idx];
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}
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static char *cleanup_path(char *path)
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{
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/* Clean it up */
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if (!memcmp(path, "./", 2)) {
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path += 2;
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while (*path == '/')
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path++;
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}
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return path;
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}
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char *mkpath(const char *fmt, ...)
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{
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va_list args;
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unsigned len;
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char *pathname = get_pathname();
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va_start(args, fmt);
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len = vsnprintf(pathname, PATH_MAX, fmt, args);
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va_end(args);
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if (len >= PATH_MAX)
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return bad_path;
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return cleanup_path(pathname);
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}
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int path__join(char *bf, size_t size, const char *path1, const char *path2)
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{
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return scnprintf(bf, size, "%s%s%s", path1, path1[0] ? "/" : "", path2);
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}
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int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3)
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{
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return scnprintf(bf, size, "%s%s%s%s%s", path1, path1[0] ? "/" : "",
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path2, path2[0] ? "/" : "", path3);
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}
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bool is_regular_file(const char *file)
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{
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struct stat st;
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if (stat(file, &st))
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return false;
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return S_ISREG(st.st_mode);
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}
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/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
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bool is_directory(const char *base_path, const struct dirent *dent)
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{
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char path[PATH_MAX];
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struct stat st;
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sprintf(path, "%s/%s", base_path, dent->d_name);
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if (stat(path, &st))
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return false;
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return S_ISDIR(st.st_mode);
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}
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