1 /* file_util.c - convenience routines for common stat operations
5 Copyright (C) 2001 University of Southern California
7 This program is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public License as
9 published by the Free Software Foundation; either version 2, or (at
10 your option) any later version.
12 This program is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
19 #include <sys/types.h>
23 #include "sprintf_alloc.h"
24 #include "file_util.h"
26 #include "libbb/libbb.h"
29 #if defined HAVE_SHA256
33 int file_exists(const char *file_name)
38 err = stat(file_name, &stat_buf);
46 int file_is_dir(const char *file_name)
51 err = stat(file_name, &stat_buf);
56 return S_ISDIR(stat_buf.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 #define FILE_READ_LINE_BUF_SIZE 1024
67 char *file_read_line_alloc(FILE *file)
69 char buf[FILE_READ_LINE_BUF_SIZE];
74 memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
75 while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
76 buf_len = strlen(buf);
79 line = xrealloc(line, line_size);
82 line_size = buf_len + 1;
85 if (buf[buf_len - 1] == '\n') {
93 int file_move(const char *src, const char *dest)
97 err = rename(src, dest);
99 if (err && errno == EXDEV) {
100 err = file_copy(src, dest);
103 fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
104 __FUNCTION__, src, dest, strerror(errno));
110 /* I put these here to keep libbb dependencies from creeping all over
112 int file_copy(const char *src, const char *dest)
116 err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
118 fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
119 __FUNCTION__, src, dest);
125 int file_mkdir_hier(const char *path, long mode)
127 return make_directory(path, mode, FILEUTILS_RECUR);
130 char *file_md5sum_alloc(const char *file_name)
132 static const int md5sum_bin_len = 16;
133 static const int md5sum_hex_len = 32;
135 static const unsigned char bin2hex[16] = {
145 unsigned char md5sum_bin[md5sum_bin_len];
147 md5sum_hex = xcalloc(1, md5sum_hex_len + 1);
149 file = fopen(file_name, "r");
151 fprintf(stderr, "%s: Failed to open file %s: %s\n",
152 __FUNCTION__, file_name, strerror(errno));
157 err = md5_stream(file, md5sum_bin);
159 fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
160 __FUNCTION__, file_name, strerror(err));
168 for (i=0; i < md5sum_bin_len; i++) {
169 md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
170 md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
173 md5sum_hex[md5sum_hex_len] = '\0';
179 char *file_sha256sum_alloc(const char *file_name)
181 static const int sha256sum_bin_len = 32;
182 static const int sha256sum_hex_len = 64;
184 static const unsigned char bin2hex[16] = {
194 unsigned char sha256sum_bin[sha256sum_bin_len];
196 sha256sum_hex = xcalloc(1, sha256sum_hex_len + 1);
198 file = fopen(file_name, "r");
200 fprintf(stderr, "%s: Failed to open file %s: %s\n",
201 __FUNCTION__, file_name, strerror(errno));
206 err = sha256_stream(file, sha256sum_bin);
208 fprintf(stderr, "%s: ERROR computing sha256sum for %s: %s\n",
209 __FUNCTION__, file_name, strerror(err));
217 for (i=0; i < sha256sum_bin_len; i++) {
218 sha256sum_hex[i*2] = bin2hex[sha256sum_bin[i] >> 4];
219 sha256sum_hex[i*2+1] = bin2hex[sha256sum_bin[i] & 0xf];
222 sha256sum_hex[sha256sum_hex_len] = '\0';
224 return sha256sum_hex;
231 rm_r(const char *path)
239 perror_msg("%s: opendir(%s)", __FUNCTION__, path);
243 if (fchdir(dirfd(dir)) == -1) {
244 perror_msg("%s: fchdir(%s)", __FUNCTION__, path);
251 if ((dent = readdir(dir)) == NULL) {
253 perror_msg("%s: readdir(%s)",
260 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
264 if (dent->d_type == DT_DIR) {
265 if ((ret = rm_r(dent->d_name)) == -1)
268 } else if (dent->d_type == DT_UNKNOWN)
272 if ((ret = lstat(dent->d_name, &st)) == -1) {
273 perror_msg("%s: lstat(%s)",
274 __FUNCTION__, dent->d_name);
277 if (S_ISDIR(st.st_mode)) {
278 if ((ret = rm_r(dent->d_name)) == -1)
284 if ((ret = unlink(dent->d_name)) == -1) {
285 perror_msg("%s: unlink(%s)",
286 __FUNCTION__, dent->d_name);
291 if (chdir("..") == -1) {
293 perror_msg("%s: chdir(%s/..)", __FUNCTION__, path);
296 if (rmdir(path) == -1 ) {
298 perror_msg("%s: rmdir(%s)", __FUNCTION__, path);
301 if (closedir(dir) == -1) {
303 perror_msg("%s: closedir(%s)", __FUNCTION__, path);