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.
20 #include <sys/types.h>
26 #include "sprintf_alloc.h"
27 #include "file_util.h"
31 #include "libbb/libbb.h"
33 #if defined HAVE_SHA256
37 int file_exists(const char *file_name)
41 if (stat(file_name, &st) == -1)
47 int file_is_dir(const char *file_name)
51 if (stat(file_name, &st) == -1)
54 return S_ISDIR(st.st_mode);
57 /* read a single line from a file, stopping at a newline or EOF.
58 If a newline is read, it will appear in the resulting string.
59 Return value is a malloc'ed char * which should be freed at
60 some point by the caller.
62 Return value is NULL if the file is at EOF when called.
64 char *file_read_line_alloc(FILE * fp)
69 unsigned int line_size = 0;
74 while (fgets(buf, BUFSIZ, fp)) {
75 buf_len = strlen(buf);
76 if (buf[buf_len - 1] == '\n') {
83 line = xrealloc(line, line_size + 1);
84 strncat(line, buf, line_size);
86 line_size = buf_len + 1;
96 int file_move(const char *src, const char *dest)
100 err = rename(src, dest);
102 if (errno == EXDEV) {
103 /* src & dest live on different file systems */
104 err = file_copy(src, dest);
108 opkg_perror(ERROR, "Failed to rename %s to %s",
116 int file_copy(const char *src, const char *dest)
120 err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
122 opkg_msg(ERROR, "Failed to copy file %s to %s.\n", src, dest);
127 int file_mkdir_hier(const char *path, long mode)
129 return make_directory(path, mode, FILEUTILS_RECUR);
133 char *file_md5sum_alloc(const char *file_name)
135 static const int md5sum_bin_len = 16;
136 static const int md5sum_hex_len = 32;
138 static const unsigned char bin2hex[16] = {
148 unsigned char md5sum_bin[md5sum_bin_len];
150 md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
152 file = fopen(file_name, "r");
154 opkg_perror(ERROR, "Failed to open file %s", file_name);
159 err = md5_stream(file, md5sum_bin);
161 opkg_msg(ERROR, "Could't compute md5sum for %s.\n", file_name);
169 for (i = 0; i < md5sum_bin_len; i++) {
170 md5sum_hex[i * 2] = bin2hex[md5sum_bin[i] >> 4];
171 md5sum_hex[i * 2 + 1] = bin2hex[md5sum_bin[i] & 0xf];
174 md5sum_hex[md5sum_hex_len] = '\0';
181 char *file_sha256sum_alloc(const char *file_name)
183 static const int sha256sum_bin_len = 32;
184 static const int sha256sum_hex_len = 64;
186 static const unsigned char bin2hex[16] = {
196 unsigned char sha256sum_bin[sha256sum_bin_len];
198 sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
200 file = fopen(file_name, "r");
202 opkg_perror(ERROR, "Failed to open file %s", file_name);
207 err = sha256_stream(file, sha256sum_bin);
209 opkg_msg(ERROR, "Could't compute sha256sum for %s.\n",
218 for (i = 0; i < sha256sum_bin_len; i++) {
219 sha256sum_hex[i * 2] = bin2hex[sha256sum_bin[i] >> 4];
220 sha256sum_hex[i * 2 + 1] = bin2hex[sha256sum_bin[i] & 0xf];
223 sha256sum_hex[sha256sum_hex_len] = '\0';
225 return sha256sum_hex;
230 char *checksum_bin2hex(const char *src, size_t len)
233 static unsigned char buf[65];
234 const unsigned char *s = (unsigned char *)src;
235 static const unsigned char bin2hex[16] = {
245 for (p = buf; len > 0; s++, len--) {
246 *p++ = bin2hex[*s / 16];
247 *p++ = bin2hex[*s % 16];
255 char *checksum_hex2bin(const char *src, size_t *len)
259 const unsigned char *s = (unsigned char *)src;
260 static unsigned char buf[32];
267 while (isspace(*src))
278 (c >= 'a' ? (c - 'a') : (c >= 'A' ? (c - 'A') : (c - '0')))
280 for (p = buf, *len = 0;
281 slen > 0 && isxdigit(s[0]) && isxdigit(s[1]);
282 slen--, s += 2, (*len)++)
283 *p++ = hex(s[0]) * 16 + hex(s[1]);
288 int rm_r(const char *path)
295 opkg_perror(ERROR, "Missing directory parameter");
301 opkg_perror(ERROR, "Failed to open dir %s", path);
305 if (fchdir(dirfd(dir)) == -1) {
306 opkg_perror(ERROR, "Failed to change to dir %s", path);
313 if ((dent = readdir(dir)) == NULL) {
315 opkg_perror(ERROR, "Failed to read dir %s",
322 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
326 if (dent->d_type == DT_DIR) {
327 if ((ret = rm_r(dent->d_name)) == -1)
330 } else if (dent->d_type == DT_UNKNOWN)
334 if ((ret = lstat(dent->d_name, &st)) == -1) {
335 opkg_perror(ERROR, "Failed to lstat %s",
339 if (S_ISDIR(st.st_mode)) {
340 if ((ret = rm_r(dent->d_name)) == -1)
346 if ((ret = unlink(dent->d_name)) == -1) {
347 opkg_perror(ERROR, "Failed to unlink %s", dent->d_name);
352 if (chdir("..") == -1) {
354 opkg_perror(ERROR, "Failed to change to dir %s/..", path);
357 if (rmdir(path) == -1) {
359 opkg_perror(ERROR, "Failed to remove dir %s", path);
362 if (closedir(dir) == -1) {
364 opkg_perror(ERROR, "Failed to close dir %s", path);