1 /* file_util.c - convenience routines for common stat operations
3 Copyright (C) 2009 Ubiq Technologies <graham.gower@gmail.com>
6 Copyright (C) 2001 University of Southern California
8 This program is free software; you can redistribute it and/or
9 modify it under the terms of the GNU General Public License as
10 published by the Free Software Foundation; either version 2, or (at
11 your option) any later version.
13 This program is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
22 #include <sys/types.h>
28 #include "sprintf_alloc.h"
29 #include "file_util.h"
33 #include "libbb/libbb.h"
35 #if defined HAVE_SHA256
39 int file_exists(const char *file_name)
43 if (stat(file_name, &st) == -1)
49 int file_is_dir(const char *file_name)
53 if (stat(file_name, &st) == -1)
56 return S_ISDIR(st.st_mode);
59 /* read a single line from a file, stopping at a newline or EOF.
60 If a newline is read, it will appear in the resulting string.
61 Return value is a malloc'ed char * which should be freed at
62 some point by the caller.
64 Return value is NULL if the file is at EOF when called.
66 char *file_read_line_alloc(FILE * fp)
71 unsigned int line_size = 0;
76 while (fgets(buf, BUFSIZ, fp)) {
77 buf_len = strlen(buf);
78 if (buf[buf_len - 1] == '\n') {
85 line = xrealloc(line, line_size + 1);
86 strncat(line, buf, line_size);
88 line_size = buf_len + 1;
98 int file_move(const char *src, const char *dest)
102 err = rename(src, dest);
104 if (errno == EXDEV) {
105 /* src & dest live on different file systems */
106 err = file_copy(src, dest);
110 opkg_perror(ERROR, "Failed to rename %s to %s",
118 int file_copy(const char *src, const char *dest)
122 err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
124 opkg_msg(ERROR, "Failed to copy file %s to %s.\n", src, dest);
129 int file_mkdir_hier(const char *path, long mode)
131 return make_directory(path, mode, FILEUTILS_RECUR);
135 char *file_md5sum_alloc(const char *file_name)
137 static const int md5sum_bin_len = 16;
138 static const int md5sum_hex_len = 32;
140 static const unsigned char bin2hex[16] = {
150 unsigned char md5sum_bin[md5sum_bin_len];
152 md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
154 file = fopen(file_name, "r");
156 opkg_perror(ERROR, "Failed to open file %s", file_name);
161 err = md5_stream(file, md5sum_bin);
163 opkg_msg(ERROR, "Could't compute md5sum for %s.\n", file_name);
171 for (i = 0; i < md5sum_bin_len; i++) {
172 md5sum_hex[i * 2] = bin2hex[md5sum_bin[i] >> 4];
173 md5sum_hex[i * 2 + 1] = bin2hex[md5sum_bin[i] & 0xf];
176 md5sum_hex[md5sum_hex_len] = '\0';
183 char *file_sha256sum_alloc(const char *file_name)
185 static const int sha256sum_bin_len = 32;
186 static const int sha256sum_hex_len = 64;
188 static const unsigned char bin2hex[16] = {
198 unsigned char sha256sum_bin[sha256sum_bin_len];
200 sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
202 file = fopen(file_name, "r");
204 opkg_perror(ERROR, "Failed to open file %s", file_name);
209 err = sha256_stream(file, sha256sum_bin);
211 opkg_msg(ERROR, "Could't compute sha256sum for %s.\n",
220 for (i = 0; i < sha256sum_bin_len; i++) {
221 sha256sum_hex[i * 2] = bin2hex[sha256sum_bin[i] >> 4];
222 sha256sum_hex[i * 2 + 1] = bin2hex[sha256sum_bin[i] & 0xf];
225 sha256sum_hex[sha256sum_hex_len] = '\0';
227 return sha256sum_hex;
232 char *checksum_bin2hex(const char *src, size_t len)
235 static unsigned char buf[65];
236 const unsigned char *s = (unsigned char *)src;
237 static const unsigned char bin2hex[16] = {
247 for (p = buf; len > 0; s++, len--) {
248 *p++ = bin2hex[*s / 16];
249 *p++ = bin2hex[*s % 16];
257 char *checksum_hex2bin(const char *src, size_t *len)
261 const unsigned char *s = (unsigned char *)src;
262 static unsigned char buf[32];
269 while (isspace(*src))
280 (c >= 'a' ? (c - 'a') : (c >= 'A' ? (c - 'A') : (c - '0')))
282 for (p = buf, *len = 0;
283 slen > 0 && isxdigit(s[0]) && isxdigit(s[1]);
284 slen--, s += 2, (*len)++)
285 *p++ = hex(s[0]) * 16 + hex(s[1]);
290 int rm_r(const char *path)
297 opkg_perror(ERROR, "Missing directory parameter");
303 opkg_perror(ERROR, "Failed to open dir %s", path);
307 if (fchdir(dirfd(dir)) == -1) {
308 opkg_perror(ERROR, "Failed to change to dir %s", path);
315 if ((dent = readdir(dir)) == NULL) {
317 opkg_perror(ERROR, "Failed to read dir %s",
324 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
328 if (dent->d_type == DT_DIR) {
329 if ((ret = rm_r(dent->d_name)) == -1)
332 } else if (dent->d_type == DT_UNKNOWN)
336 if ((ret = lstat(dent->d_name, &st)) == -1) {
337 opkg_perror(ERROR, "Failed to lstat %s",
341 if (S_ISDIR(st.st_mode)) {
342 if ((ret = rm_r(dent->d_name)) == -1)
348 if ((ret = unlink(dent->d_name)) == -1) {
349 opkg_perror(ERROR, "Failed to unlink %s", dent->d_name);
354 if (chdir("..") == -1) {
356 opkg_perror(ERROR, "Failed to change to dir %s/..", path);
359 if (rmdir(path) == -1) {
361 opkg_perror(ERROR, "Failed to remove dir %s", path);
364 if (closedir(dir) == -1) {
366 opkg_perror(ERROR, "Failed to close dir %s", path);