2 * (C) Copyright 2011 Free Electrons
3 * David Wagner <david.wagner@free-electrons.com>
5 * Inspired from envcrc.c:
7 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 /* We want the GNU version of basename() */
38 #include <sys/types.h>
43 #include <u-boot/crc.h>
46 #define CRC_SIZE sizeof(uint32_t)
48 static void usage(const char *exec_name)
50 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
52 "This tool takes a key=value input file (same as would a `printenv' show) and generates the corresponding environment image, ready to be flashed.\n"
54 "\tThe input file is in format:\n"
58 "\t-r : the environment has multiple copies in flash\n"
59 "\t-b : the target is big endian (default is little endian)\n"
60 "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
61 "\t-V : print version information and exit\n"
63 "If the input file is \"-\", data is read from standard input\n",
67 long int xstrtol(const char *s)
72 tmp = strtol(s, NULL, 0);
77 fprintf(stderr, "Bad integer format: %s\n", s);
79 fprintf(stderr, "Error while parsing %s: %s\n", s,
85 int main(int argc, char **argv)
87 uint32_t crc, targetendian_crc;
88 const char *txt_filename = NULL, *bin_filename = NULL;
90 unsigned char *dataptr, *envptr;
91 unsigned char *filebuf = NULL;
92 unsigned int filesize = 0, envsize = 0, datasize = 0;
95 unsigned char padbyte = 0xff;
98 int ret = EXIT_SUCCESS;
100 struct stat txt_file_stat;
105 prg = basename(argv[0]);
107 /* Turn off getopt()'s internal error message */
110 /* Parse the cmdline */
111 while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
114 datasize = xstrtol(optarg);
117 bin_filename = strdup(optarg);
119 fprintf(stderr, "Can't strdup() the output filename\n");
130 padbyte = xstrtol(optarg);
136 printf("%s version %s\n", prg, PLAIN_VERSION);
139 fprintf(stderr, "Missing argument for option -%c\n",
144 fprintf(stderr, "Wrong option -%c\n", optopt);
150 /* Check datasize and allocate the data */
152 fprintf(stderr, "Please specify the size of the environment partition.\n");
157 dataptr = malloc(datasize * sizeof(*dataptr));
159 fprintf(stderr, "Can't alloc %d bytes for dataptr.\n",
165 * envptr points to the beginning of the actual environment (after the
166 * crc and possible `redundant' byte
168 envsize = datasize - (CRC_SIZE + redundant);
169 envptr = dataptr + CRC_SIZE + redundant;
171 /* Pad the environment with the padding byte */
172 memset(envptr, padbyte, envsize);
174 /* Open the input file ... */
175 if (optind >= argc || strcmp(argv[optind], "-") == 0) {
177 int readlen = sizeof(*envptr) * 4096;
178 txt_fd = STDIN_FILENO;
181 filebuf = realloc(filebuf, readlen);
183 fprintf(stderr, "Can't realloc memory for the input file buffer\n");
186 readbytes = read(txt_fd, filebuf + filesize, readlen);
188 fprintf(stderr, "Error while reading stdin: %s\n",
192 filesize += readbytes;
193 } while (readbytes == readlen);
196 txt_filename = argv[optind];
197 txt_fd = open(txt_filename, O_RDONLY);
199 fprintf(stderr, "Can't open \"%s\": %s\n",
200 txt_filename, strerror(errno));
203 /* ... and check it */
204 ret = fstat(txt_fd, &txt_file_stat);
206 fprintf(stderr, "Can't stat() on \"%s\": %s\n",
207 txt_filename, strerror(errno));
211 filesize = txt_file_stat.st_size;
213 filebuf = mmap(NULL, sizeof(*envptr) * filesize, PROT_READ,
214 MAP_PRIVATE, txt_fd, 0);
215 if (filebuf == MAP_FAILED) {
216 fprintf(stderr, "mmap (%ld bytes) failed: %s\n",
217 sizeof(*envptr) * filesize,
219 fprintf(stderr, "Falling back to read()\n");
221 filebuf = malloc(sizeof(*envptr) * filesize);
222 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
223 if (ret != sizeof(*envptr) * filesize) {
224 fprintf(stderr, "Can't read the whole input file (%ld bytes): %s\n",
225 sizeof(*envptr) * filesize,
233 /* The +1 is for the additionnal ending \0. See below. */
234 if (filesize + 1 > envsize) {
235 fprintf(stderr, "The input file is larger than the environment partition size\n");
239 /* Replace newlines separating variables with \0 */
240 for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
241 if (filebuf[fp] == '\n') {
244 * Newlines at the beginning of the file ?
248 } else if (filebuf[fp-1] == '\\') {
250 * Embedded newline in a variable.
252 * The backslash was added to the envptr; rewind
253 * and replace it with a newline
258 /* End of a variable */
262 envptr[ep++] = filebuf[fp];
266 * Make sure there is a final '\0'
267 * And do it again on the next byte to mark the end of the environment.
269 if (envptr[ep-1] != '\0') {
272 * The text file doesn't have an ending newline. We need to
273 * check the env size again to make sure we have room for two \0
276 fprintf(stderr, "The environment file is too large for the target environment storage\n");
284 /* Computes the CRC and put it at the beginning of the data */
285 crc = crc32(0, envptr, envsize);
286 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
288 memcpy(dataptr, &targetendian_crc, sizeof(uint32_t));
290 if (!bin_filename || strcmp(bin_filename, "-") == 0) {
291 bin_fd = STDOUT_FILENO;
293 bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP |
296 fprintf(stderr, "Can't open output file \"%s\": %s\n",
297 bin_filename, strerror(errno));
302 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
303 sizeof(*dataptr) * datasize) {
304 fprintf(stderr, "write() failed: %s\n", strerror(errno));