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>
27 #include "sprintf_alloc.h"
28 #include "file_util.h"
32 #include "libbb/libbb.h"
34 #if defined HAVE_SHA256
39 file_exists(const char *file_name)
43 if (stat(file_name, &st) == -1)
50 file_is_dir(const char *file_name)
54 if (stat(file_name, &st) == -1)
57 return S_ISDIR(st.st_mode);
60 /* read a single line from a file, stopping at a newline or EOF.
61 If a newline is read, it will appear in the resulting string.
62 Return value is a malloc'ed char * which should be freed at
63 some point by the caller.
65 Return value is NULL if the file is at EOF when called.
68 file_read_line_alloc(FILE *fp)
73 unsigned int line_size = 0;
78 while (fgets(buf, BUFSIZ, fp)) {
79 buf_len = strlen(buf);
80 if (buf[buf_len - 1] == '\n') {
87 line = xrealloc(line, line_size+1);
88 strncat(line, buf, line_size);
90 line_size = buf_len + 1;
101 file_move(const char *src, const char *dest)
105 err = rename(src, dest);
107 if (errno == EXDEV) {
108 /* src & dest live on different file systems */
109 err = file_copy(src, dest);
113 opkg_perror(ERROR, "Failed to rename %s to %s",
122 file_copy(const char *src, const char *dest)
126 err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
128 opkg_msg(ERROR, "Failed to copy file %s to %s.\n",
135 file_mkdir_hier(const char *path, long mode)
137 return make_directory(path, mode, FILEUTILS_RECUR);
141 char *file_md5sum_alloc(const char *file_name)
143 static const int md5sum_bin_len = 16;
144 static const int md5sum_hex_len = 32;
146 static const unsigned char bin2hex[16] = {
156 unsigned char md5sum_bin[md5sum_bin_len];
158 md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
160 file = fopen(file_name, "r");
162 opkg_perror(ERROR, "Failed to open file %s", file_name);
167 err = md5_stream(file, md5sum_bin);
169 opkg_msg(ERROR, "Could't compute md5sum for %s.\n", file_name);
177 for (i=0; i < md5sum_bin_len; i++) {
178 md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
179 md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
182 md5sum_hex[md5sum_hex_len] = '\0';
189 char *file_sha256sum_alloc(const char *file_name)
191 static const int sha256sum_bin_len = 32;
192 static const int sha256sum_hex_len = 64;
194 static const unsigned char bin2hex[16] = {
204 unsigned char sha256sum_bin[sha256sum_bin_len];
206 sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
208 file = fopen(file_name, "r");
210 opkg_perror(ERROR, "Failed to open file %s", file_name);
215 err = sha256_stream(file, sha256sum_bin);
217 opkg_msg(ERROR, "Could't compute sha256sum for %s.\n", file_name);
225 for (i=0; i < sha256sum_bin_len; i++) {
226 sha256sum_hex[i*2] = bin2hex[sha256sum_bin[i] >> 4];
227 sha256sum_hex[i*2+1] = bin2hex[sha256sum_bin[i] & 0xf];
230 sha256sum_hex[sha256sum_hex_len] = '\0';
232 return sha256sum_hex;
239 rm_r(const char *path)
246 opkg_perror(ERROR, "Missing directory parameter");
252 opkg_perror(ERROR, "Failed to open dir %s", path);
256 if (fchdir(dirfd(dir)) == -1) {
257 opkg_perror(ERROR, "Failed to change to dir %s", path);
264 if ((dent = readdir(dir)) == NULL) {
266 opkg_perror(ERROR, "Failed to read dir %s",
273 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
277 if (dent->d_type == DT_DIR) {
278 if ((ret = rm_r(dent->d_name)) == -1)
281 } else if (dent->d_type == DT_UNKNOWN)
285 if ((ret = lstat(dent->d_name, &st)) == -1) {
286 opkg_perror(ERROR, "Failed to lstat %s",
290 if (S_ISDIR(st.st_mode)) {
291 if ((ret = rm_r(dent->d_name)) == -1)
297 if ((ret = unlink(dent->d_name)) == -1) {
298 opkg_perror(ERROR, "Failed to unlink %s", dent->d_name);
303 if (chdir("..") == -1) {
305 opkg_perror(ERROR, "Failed to change to dir %s/..", path);
308 if (rmdir(path) == -1 ) {
310 opkg_perror(ERROR, "Failed to remove dir %s", path);
313 if (closedir(dir) == -1) {
315 opkg_perror(ERROR, "Failed to close dir %s", path);