libopkg/file_util.c

   1 /* file_util.c - convenience routines for common stat operations
   2
   3    Carl D. Worth
   4
   5    Copyright (C) 2001 University of Southern California
   6
   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.
  11
  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.
  16 */
  17
  18 #include "includes.h"
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21
  22 #include "sprintf_alloc.h"
  23 #include "file_util.h"
  24 #include "md5.h"
  25 #include "libbb/libbb.h"
  26 #undef strlen
  27
  28 #if defined HAVE_SHA256
  29 #include "sha256.h"
  30 #endif
  31
  32 int file_exists(const char *file_name)
  33 {
  34     int err;
  35     struct stat stat_buf;
  36
  37     err = stat(file_name, &stat_buf);
  38     if (err == 0) {
  39         return 1;
  40     } else {
  41         return 0;
  42     }
  43 }
  44
  45 int file_is_dir(const char *file_name)
  46 {
  47     int err;
  48     struct stat stat_buf;
  49
  50     err = stat(file_name, &stat_buf);
  51     if (err) {
  52         return 0;
  53     }
  54
  55     return S_ISDIR(stat_buf.st_mode);
  56 }
  57
  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.
  62
  63    Return value is NULL if the file is at EOF when called.
  64 */
  65 #define FILE_READ_LINE_BUF_SIZE 1024
  66 char *file_read_line_alloc(FILE *file)
  67 {
  68     char buf[FILE_READ_LINE_BUF_SIZE];
  69     int buf_len;
  70     char *line = NULL;
  71     int line_size = 0;
  72
  73     memset(buf, 0, FILE_READ_LINE_BUF_SIZE);
  74     while (fgets(buf, FILE_READ_LINE_BUF_SIZE, file)) {
  75         buf_len = strlen(buf);
  76         if (line) {
  77             line_size += buf_len;
  78             line = realloc(line, line_size);
  79             if (line == NULL) {
  80                 fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
  81                 break;
  82             }
  83             strcat(line, buf);
  84         } else {
  85             line_size = buf_len + 1;
  86             line = strdup(buf);
  87         }
  88         if (buf[buf_len - 1] == '\n') {
  89             break;
  90         }
  91     }
  92
  93     return line;
  94 }
  95
  96 int file_move(const char *src, const char *dest)
  97 {
  98     int err;
  99
 100     err = rename(src, dest);
 101
 102     if (err && errno == EXDEV) {
 103         err = file_copy(src, dest);
 104         unlink(src);
 105     } else if (err) {
 106         fprintf(stderr, "%s: ERROR: failed to rename %s to %s: %s\n",
 107                 __FUNCTION__, src, dest, strerror(errno));
 108     }
 109
 110     return err;
 111 }
 112
 113 /* I put these here to keep libbb dependencies from creeping all over
 114    the opkg code */
 115 int file_copy(const char *src, const char *dest)
 116 {
 117     int err;
 118
 119     err = copy_file(src, dest, FILEUTILS_FORCE | FILEUTILS_PRESERVE_STATUS);
 120     if (err) {
 121         fprintf(stderr, "%s: ERROR: failed to copy %s to %s\n",
 122                 __FUNCTION__, src, dest);
 123     }
 124
 125     return err;
 126 }
 127
 128 int file_mkdir_hier(const char *path, long mode)
 129 {
 130     return make_directory(path, mode, FILEUTILS_RECUR);
 131 }
 132
 133 char *file_md5sum_alloc(const char *file_name)
 134 {
 135     static const int md5sum_bin_len = 16;
 136     static const int md5sum_hex_len = 32;
 137
 138     static const unsigned char bin2hex[16] = {
 139         '0', '1', '2', '3',
 140         '4', '5', '6', '7',
 141         '8', '9', 'a', 'b',
 142         'c', 'd', 'e', 'f'
 143     };
 144
 145     int i, err;
 146     FILE *file;
 147     char *md5sum_hex;
 148     unsigned char md5sum_bin[md5sum_bin_len];
 149
 150     md5sum_hex = calloc(1, md5sum_hex_len + 1);
 151     if (md5sum_hex == NULL) {
 152         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 153         return strdup("");
 154     }
 155
 156     file = fopen(file_name, "r");
 157     if (file == NULL) {
 158         fprintf(stderr, "%s: Failed to open file %s: %s\n",
 159                 __FUNCTION__, file_name, strerror(errno));
 160         return strdup("");
 161     }
 162
 163     err = md5_stream(file, md5sum_bin);
 164     if (err) {
 165         fprintf(stderr, "%s: ERROR computing md5sum for %s: %s\n",
 166                 __FUNCTION__, file_name, strerror(err));
 167         return strdup("");
 168     }
 169
 170     fclose(file);
 171
 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];
 175     }
 176
 177     md5sum_hex[md5sum_hex_len] = '\0';
 178
 179     return md5sum_hex;
 180 }
 181
 182 #ifdef HAVE_SHA256
 183 char *file_sha256sum_alloc(const char *file_name)
 184 {
 185     static const int sha256sum_bin_len = 32;
 186     static const int sha256sum_hex_len = 64;
 187
 188     static const unsigned char bin2hex[16] = {
 189         '0', '1', '2', '3',
 190         '4', '5', '6', '7',
 191         '8', '9', 'a', 'b',
 192         'c', 'd', 'e', 'f'
 193     };
 194
 195     int i, err;
 196     FILE *file;
 197     char *sha256sum_hex;
 198     unsigned char sha256sum_bin[sha256sum_bin_len];
 199
 200     sha256sum_hex = calloc(1, sha256sum_hex_len + 1);
 201     if (sha256sum_hex == NULL) {
 202         fprintf(stderr, "%s: out of memory\n", __FUNCTION__);
 203         return strdup("");
 204     }
 205
 206     file = fopen(file_name, "r");
 207     if (file == NULL) {
 208         fprintf(stderr, "%s: Failed to open file %s: %s\n",
 209                 __FUNCTION__, file_name, strerror(errno));
 210         return strdup("");
 211     }
 212
 213     err = sha256_stream(file, sha256sum_bin);
 214     if (err) {
 215         fprintf(stderr, "%s: ERROR computing sha256sum for %s: %s\n",
 216                 __FUNCTION__, file_name, strerror(err));
 217         return strdup("");
 218     }
 219
 220     fclose(file);
 221
 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];
 225     }
 226
 227     sha256sum_hex[sha256sum_hex_len] = '\0';
 228
 229     return sha256sum_hex;
 230 }
 231
 232 #endif