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() */
39 #include <sys/types.h>
44 #include <u-boot/crc.h>
47 #define CRC_SIZE sizeof(uint32_t)
50 #define FILE_PERM (S_IRUSR | S_IWUSR)
52 #define FILE_PERM (S_IRUSR | S_IWUSR | S_IRGRP |\
56 static void usage(const char *exec_name)
58 fprintf(stderr, "%s [-h] [-r] [-b] [-p <byte>] -s <environment partition size> -o <output> <input file>\n"
60 "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"
62 "\tThe input file is in format:\n"
66 "\t-r : the environment has multiple copies in flash\n"
67 "\t-b : the target is big endian (default is little endian)\n"
68 "\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
69 "\t-V : print version information and exit\n"
71 "If the input file is \"-\", data is read from standard input\n",
75 long int xstrtol(const char *s)
80 tmp = strtol(s, NULL, 0);
85 fprintf(stderr, "Bad integer format: %s\n", s);
87 fprintf(stderr, "Error while parsing %s: %s\n", s,
93 int main(int argc, char **argv)
95 uint32_t crc, targetendian_crc;
96 const char *txt_filename = NULL, *bin_filename = NULL;
98 unsigned char *dataptr, *envptr;
99 unsigned char *filebuf = NULL;
100 unsigned int filesize = 0, envsize = 0, datasize = 0;
103 unsigned char padbyte = 0xff;
106 int ret = EXIT_SUCCESS;
108 struct stat txt_file_stat;
113 prg = basename(argv[0]);
115 /* Turn off getopt()'s internal error message */
118 /* Parse the cmdline */
119 while ((option = getopt(argc, argv, ":s:o:rbp:hV")) != -1) {
122 datasize = xstrtol(optarg);
125 bin_filename = strdup(optarg);
127 fprintf(stderr, "Can't strdup() the output filename\n");
138 padbyte = xstrtol(optarg);
144 printf("%s version %s\n", prg, PLAIN_VERSION);
147 fprintf(stderr, "Missing argument for option -%c\n",
152 fprintf(stderr, "Wrong option -%c\n", optopt);
158 /* Check datasize and allocate the data */
160 fprintf(stderr, "Please specify the size of the environment partition.\n");
165 dataptr = malloc(datasize * sizeof(*dataptr));
167 fprintf(stderr, "Can't alloc %d bytes for dataptr.\n",
173 * envptr points to the beginning of the actual environment (after the
174 * crc and possible `redundant' byte
176 envsize = datasize - (CRC_SIZE + redundant);
177 envptr = dataptr + CRC_SIZE + redundant;
179 /* Pad the environment with the padding byte */
180 memset(envptr, padbyte, envsize);
182 /* Open the input file ... */
183 if (optind >= argc || strcmp(argv[optind], "-") == 0) {
185 int readlen = sizeof(*envptr) * 4096;
186 txt_fd = STDIN_FILENO;
189 filebuf = realloc(filebuf, readlen);
191 fprintf(stderr, "Can't realloc memory for the input file buffer\n");
194 readbytes = read(txt_fd, filebuf + filesize, readlen);
196 fprintf(stderr, "Error while reading stdin: %s\n",
200 filesize += readbytes;
201 } while (readbytes == readlen);
204 txt_filename = argv[optind];
205 txt_fd = open(txt_filename, O_RDONLY);
207 fprintf(stderr, "Can't open \"%s\": %s\n",
208 txt_filename, strerror(errno));
211 /* ... and check it */
212 ret = fstat(txt_fd, &txt_file_stat);
214 fprintf(stderr, "Can't stat() on \"%s\": %s\n",
215 txt_filename, strerror(errno));
219 filesize = txt_file_stat.st_size;
221 filebuf = mmap(NULL, sizeof(*envptr) * filesize, PROT_READ,
222 MAP_PRIVATE, txt_fd, 0);
223 if (filebuf == MAP_FAILED) {
224 fprintf(stderr, "mmap (%zu bytes) failed: %s\n",
225 sizeof(*envptr) * filesize,
227 fprintf(stderr, "Falling back to read()\n");
229 filebuf = malloc(sizeof(*envptr) * filesize);
230 ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
231 if (ret != sizeof(*envptr) * filesize) {
232 fprintf(stderr, "Can't read the whole input file (%zu bytes): %s\n",
233 sizeof(*envptr) * filesize,
241 /* The +1 is for the additionnal ending \0. See below. */
242 if (filesize + 1 > envsize) {
243 fprintf(stderr, "The input file is larger than the environment partition size\n");
247 /* Replace newlines separating variables with \0 */
248 for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
249 if (filebuf[fp] == '\n') {
252 * Newlines at the beginning of the file ?
256 } else if (filebuf[fp-1] == '\\') {
258 * Embedded newline in a variable.
260 * The backslash was added to the envptr; rewind
261 * and replace it with a newline
266 /* End of a variable */
270 envptr[ep++] = filebuf[fp];
274 * Make sure there is a final '\0'
275 * And do it again on the next byte to mark the end of the environment.
277 if (envptr[ep-1] != '\0') {
280 * The text file doesn't have an ending newline. We need to
281 * check the env size again to make sure we have room for two \0
284 fprintf(stderr, "The environment file is too large for the target environment storage\n");
292 /* Computes the CRC and put it at the beginning of the data */
293 crc = crc32(0, envptr, envsize);
294 targetendian_crc = bigendian ? cpu_to_be32(crc) : cpu_to_le32(crc);
296 memcpy(dataptr, &targetendian_crc, sizeof(targetendian_crc));
298 dataptr[sizeof(targetendian_crc)] = 1;
300 if (!bin_filename || strcmp(bin_filename, "-") == 0) {
301 bin_fd = STDOUT_FILENO;
303 bin_fd = creat(bin_filename, FILE_PERM);
305 fprintf(stderr, "Can't open output file \"%s\": %s\n",
306 bin_filename, strerror(errno));
311 if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=
312 sizeof(*dataptr) * datasize) {
313 fprintf(stderr, "write() failed: %s\n", strerror(errno));