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>
22 #include "sprintf_alloc.h"
23 #include "file_util.h"
25 #include "libbb/libbb.h"
28 #if defined HAVE_SHA256
32 int file_exists(const char *file_name)
37 err = stat(file_name, &stat_buf);
45 int file_is_dir(const char *file_name)
50 err = stat(file_name, &stat_buf);
55 return S_ISDIR(stat_buf.st_mode);
58 /* read a single line from a file, stopping at a newline or EOF.
59 If a newline is read, it will appear in the resulting string.
60 Return value is a malloc'ed char * which should be freed at
61 some point by the caller.
63 Return value is NULL if the file is at EOF when called.
65 #define FILE_READ_LINE_BUF_SIZE 1024
66 char *file_read_line_alloc(FILE *file)
68 char buf[FILE_READ_LINE_BUF_SIZE];
73 memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
74 while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
75 buf_len = strlen(buf);
78 line = realloc(line, line_size);
80 fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
85 line_size = buf_len + 1;
88 if (buf[buf_len - 1] == '\n') {
96 int file_move(const char *src, const char *dest)
100 err = rename(src, dest);
102 if (err && errno == EXDEV) {
103 err = file_copy(src, dest);
106 fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
107 __FUNCTION__, src, dest, strerror(errno));
113 /* I put these here to keep libbb dependencies from creeping all over
115 int file_copy(const char *src, const char *dest)
119 err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
121 fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
122 __FUNCTION__, src, dest);
128 int file_mkdir_hier(const char *path, long mode)
130 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 = calloc(1, md5sum_hex_len + 1);
151 if (md5sum_hex == NULL) {
152 fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
156 file = fopen(file_name, "r");
158 fprintf(stderr, "%s: Failed to open file %s: %s\n",
159 __FUNCTION__, file_name, strerror(errno));
163 err = md5_stream(file, md5sum_bin);
165 fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
166 __FUNCTION__, file_name, strerror(err));
172 for (i=0; i < md5sum_bin_len; i++) {
173 md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
174 md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
177 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 = calloc(1, sha256sum_hex_len + 1);
201 if (sha256sum_hex == NULL) {
202 fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
206 file = fopen(file_name, "r");
208 fprintf(stderr, "%s: Failed to open file %s: %s\n",
209 __FUNCTION__, file_name, strerror(errno));
213 err = sha256_stream(file, sha256sum_bin);
215 fprintf(stderr, "%s: ERROR computing sha256sum for %s: %s\n",
216 __FUNCTION__, file_name, strerror(err));
222 for (i=0; i < sha256sum_bin_len; i++) {
223 sha256sum_hex[i*2] = bin2hex[sha256sum_bin[i] >> 4];
224 sha256sum_hex[i*2+1] = bin2hex[sha256sum_bin[i] & 0xf];
227 sha256sum_hex[sha256sum_hex_len] = '\0';
229 return sha256sum_hex;