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/* file_util.c - convenience routines for common stat operations
Carl D. Worth
Copyright (C) 2001 University of Southern California
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
*/
#include "includes.h"
#include <sys/types.h>
#include <sys/stat.h>
#include "sprintf_alloc.h"
#include "file_util.h"
#include "md5.h"
#include "libbb/libbb.h"
#undef strlen
#if defined HAVE_SHA256
#include "sha256.h"
#endif
int file_exists(const char *file_name)
{
int err;
struct stat stat_buf;
err = stat(file_name, &stat_buf);
if (err == 0) {
return 1;
} else {
return 0;
}
}
int file_is_dir(const char *file_name)
{
int err;
struct stat stat_buf;
err = stat(file_name, &stat_buf);
if (err) {
return 0;
}
return S_ISDIR(stat_buf.st_mode);
}
/* read a single line from a file, stopping at a newline or EOF.
If a newline is read, it will appear in the resulting string.
Return value is a malloc'ed char * which should be freed at
some point by the caller.
Return value is NULL if the file is at EOF when called.
*/
#define FILE_READ_LINE_BUF_SIZE 1024
char *file_read_line_alloc(FILE *file)
{
char buf[FILE_READ_LINE_BUF_SIZE];
int buf_len;
char *line = NULL;
int line_size = 0;
memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
buf_len = strlen(buf);
if (line) {
line_size += buf_len;
line = realloc(line, line_size);
if (line == NULL) {
fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
break;
}
strcat(line, buf);
} else {
line_size = buf_len + 1;
line = strdup(buf);
}
if (buf[buf_len - 1] == '\n') {
break;
}
}
return line;
}
int file_move(const char *src, const char *dest)
{
int err;
err = rename(src, dest);
if (err && errno == EXDEV) {
err = file_copy(src, dest);
unlink(src);
} else if (err) {
fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
__FUNCTION__, src, dest, strerror(errno));
}
return err;
}
/* I put these here to keep libbb dependencies from creeping all over
the opkg code */
int file_copy(const char *src, const char *dest)
{
int err;
err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
if (err) {
fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
__FUNCTION__, src, dest);
}
return err;
}
int file_mkdir_hier(const char *path, long mode)
{
return make_directory(path, mode, FILEUTILS_RECUR);
}
char *file_md5sum_alloc(const char *file_name)
{
static const int md5sum_bin_len = 16;
static const int md5sum_hex_len = 32;
static const unsigned char bin2hex[16] = {
'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f'
};
int i, err;
FILE *file;
char *md5sum_hex;
unsigned char md5sum_bin[md5sum_bin_len];
md5sum_hex = calloc(1, md5sum_hex_len + 1);
if (md5sum_hex == NULL) {
fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
return strdup("");
}
file = fopen(file_name, "r");
if (file == NULL) {
fprintf(stderr, "%s: Failed to open file %s: %s\n",
__FUNCTION__, file_name, strerror(errno));
return strdup("");
}
err = md5_stream(file, md5sum_bin);
if (err) {
fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
__FUNCTION__, file_name, strerror(err));
return strdup("");
}
fclose(file);
for (i=0; i < md5sum_bin_len; i++) {
md5sum_hex[i*2] = bin2hex[md5sum_bin[i] >> 4];
md5sum_hex[i*2+1] = bin2hex[md5sum_bin[i] & 0xf];
}
md5sum_hex[md5sum_hex_len] = '\0';
return md5sum_hex;
}
#ifdef HAVE_SHA256
char *file_sha256sum_alloc(const char *file_name)
{
static const int sha256sum_bin_len = 32;
static const int sha256sum_hex_len = 64;
static const unsigned char bin2hex[16] = {
'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f'
};
int i, err;
FILE *file;
char *sha256sum_hex;
unsigned char sha256sum_bin[sha256sum_bin_len];
sha256sum_hex = calloc(1, sha256sum_hex_len + 1);
if (sha256sum_hex == NULL) {
fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
return strdup("");
}
file = fopen(file_name, "r");
if (file == NULL) {
fprintf(stderr, "%s: Failed to open file %s: %s\n",
__FUNCTION__, file_name, strerror(errno));
return strdup("");
}
err = sha256_stream(file, sha256sum_bin);
if (err) {
fprintf(stderr, "%s: ERROR computing sha256sum for %s: %s\n",
__FUNCTION__, file_name, strerror(err));
return strdup("");
}
fclose(file);
for (i=0; i < sha256sum_bin_len; i++) {
sha256sum_hex[i*2] = bin2hex[sha256sum_bin[i] >> 4];
sha256sum_hex[i*2+1] = bin2hex[sha256sum_bin[i] & 0xf];
}
sha256sum_hex[sha256sum_hex_len] = '\0';
return sha256sum_hex;
}
#endif
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