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
= xrealloc(line
, line_size
);
81 line_size
= buf_len
+ 1;
84 if (buf
[buf_len
- 1] == '\n') {
92 int file_move(const char *src
, const char *dest
)
96 err
= rename(src
, dest
);
98 if (err
&& errno
== EXDEV
) {
99 err
= file_copy(src
, dest
);
102 fprintf(stderr
, "%s: ERROR: failed to rename %s to %s: %s\n",
103 __FUNCTION__
, src
, dest
, strerror(errno
));
109 /* I put these here to keep libbb dependencies from creeping all over
111 int file_copy(const char *src
, const char *dest
)
115 err
= copy_file(src
, dest
, FILEUTILS_FORCE
| FILEUTILS_PRESERVE_STATUS
);
117 fprintf(stderr
, "%s: ERROR: failed to copy %s to %s\n",
118 __FUNCTION__
, src
, dest
);
124 int file_mkdir_hier(const char *path
, long mode
)
126 return make_directory(path
, mode
, FILEUTILS_RECUR
);
129 char *file_md5sum_alloc(const char *file_name
)
131 static const int md5sum_bin_len
= 16;
132 static const int md5sum_hex_len
= 32;
134 static const unsigned char bin2hex
[16] = {
144 unsigned char md5sum_bin
[md5sum_bin_len
];
146 md5sum_hex
= xcalloc(1, md5sum_hex_len
+ 1);
148 file
= fopen(file_name
, "r");
150 fprintf(stderr
, "%s: Failed to open file %s: %s\n",
151 __FUNCTION__
, file_name
, strerror(errno
));
156 err
= md5_stream(file
, md5sum_bin
);
158 fprintf(stderr
, "%s: ERROR computing md5sum for %s: %s\n",
159 __FUNCTION__
, file_name
, strerror(err
));
167 for (i
=0; i
< md5sum_bin_len
; i
++) {
168 md5sum_hex
[i
*2] = bin2hex
[md5sum_bin
[i
] >> 4];
169 md5sum_hex
[i
*2+1] = bin2hex
[md5sum_bin
[i
] & 0xf];
172 md5sum_hex
[md5sum_hex_len
] = '\0';
178 char *file_sha256sum_alloc(const char *file_name
)
180 static const int sha256sum_bin_len
= 32;
181 static const int sha256sum_hex_len
= 64;
183 static const unsigned char bin2hex
[16] = {
193 unsigned char sha256sum_bin
[sha256sum_bin_len
];
195 sha256sum_hex
= xcalloc(1, sha256sum_hex_len
+ 1);
197 file
= fopen(file_name
, "r");
199 fprintf(stderr
, "%s: Failed to open file %s: %s\n",
200 __FUNCTION__
, file_name
, strerror(errno
));
205 err
= sha256_stream(file
, sha256sum_bin
);
207 fprintf(stderr
, "%s: ERROR computing sha256sum for %s: %s\n",
208 __FUNCTION__
, file_name
, strerror(err
));
216 for (i
=0; i
< sha256sum_bin_len
; i
++) {
217 sha256sum_hex
[i
*2] = bin2hex
[sha256sum_bin
[i
] >> 4];
218 sha256sum_hex
[i
*2+1] = bin2hex
[sha256sum_bin
[i
] & 0xf];
221 sha256sum_hex
[sha256sum_hex_len
] = '\0';
223 return sha256sum_hex
;