+// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2011 Free Electrons
* David Wagner <david.wagner@free-electrons.com>
* Inspired from envcrc.c:
* (C) Copyright 2001
* Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <errno.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
+#include <u-boot/crc.h>
#include <unistd.h>
#include <libgen.h>
#include <sys/types.h>
"\t\tkey1=value1\n"
"\t\tkey2=value2\n"
"\t\t...\n"
+ "\tEmpty lines are skipped, and lines with a # in the first\n"
+ "\tcolumn are treated as comments (also skipped).\n"
"\t-r : the environment has multiple copies in flash\n"
"\t-b : the target is big endian (default is little endian)\n"
"\t-p <byte> : fill the image with <byte> bytes instead of 0xff bytes\n"
exit(EXIT_FAILURE);
}
+#define CHUNK_SIZE 4096
+
int main(int argc, char **argv)
{
uint32_t crc, targetendian_crc;
- const char *txt_filename = NULL, *bin_filename = NULL;
+ const char *bin_filename = NULL;
int txt_fd, bin_fd;
unsigned char *dataptr, *envptr;
unsigned char *filebuf = NULL;
int bigendian = 0;
int redundant = 0;
unsigned char padbyte = 0xff;
+ int readbytes = 0;
int option;
int ret = EXIT_SUCCESS;
- struct stat txt_file_stat;
-
int fp, ep;
const char *prg;
/* Open the input file ... */
if (optind >= argc || strcmp(argv[optind], "-") == 0) {
- int readbytes = 0;
- int readlen = sizeof(*envptr) * 4096;
txt_fd = STDIN_FILENO;
-
- do {
- filebuf = realloc(filebuf, readlen);
- if (!filebuf) {
- fprintf(stderr, "Can't realloc memory for the input file buffer\n");
- return EXIT_FAILURE;
- }
- readbytes = read(txt_fd, filebuf + filesize, readlen);
- if (errno) {
- fprintf(stderr, "Error while reading stdin: %s\n",
- strerror(errno));
- return EXIT_FAILURE;
- }
- filesize += readbytes;
- } while (readbytes == readlen);
-
} else {
- txt_filename = argv[optind];
- txt_fd = open(txt_filename, O_RDONLY);
+ txt_fd = open(argv[optind], O_RDONLY);
if (txt_fd == -1) {
fprintf(stderr, "Can't open \"%s\": %s\n",
- txt_filename, strerror(errno));
+ argv[optind], strerror(errno));
return EXIT_FAILURE;
}
- /* ... and check it */
- ret = fstat(txt_fd, &txt_file_stat);
- if (ret == -1) {
- fprintf(stderr, "Can't stat() on \"%s\": %s\n",
- txt_filename, strerror(errno));
+ }
+
+ do {
+ filebuf = realloc(filebuf, filesize + CHUNK_SIZE);
+ if (!filebuf) {
+ fprintf(stderr, "Can't realloc memory for the input file buffer\n");
return EXIT_FAILURE;
}
-
- filesize = txt_file_stat.st_size;
-
- filebuf = mmap(NULL, sizeof(*envptr) * filesize, PROT_READ,
- MAP_PRIVATE, txt_fd, 0);
- if (filebuf == MAP_FAILED) {
- fprintf(stderr, "mmap (%zu bytes) failed: %s\n",
- sizeof(*envptr) * filesize,
- strerror(errno));
- fprintf(stderr, "Falling back to read()\n");
-
- filebuf = malloc(sizeof(*envptr) * filesize);
- ret = read(txt_fd, filebuf, sizeof(*envptr) * filesize);
- if (ret != sizeof(*envptr) * filesize) {
- fprintf(stderr, "Can't read the whole input file (%zu bytes): %s\n",
- sizeof(*envptr) * filesize,
- strerror(errno));
-
- return EXIT_FAILURE;
- }
+ readbytes = read(txt_fd, filebuf + filesize, CHUNK_SIZE);
+ if (readbytes < 0) {
+ fprintf(stderr, "Error while reading: %s\n",
+ strerror(errno));
+ return EXIT_FAILURE;
}
+ filesize += readbytes;
+ } while (readbytes > 0);
+
+ if (txt_fd != STDIN_FILENO)
ret = close(txt_fd);
- }
- /* The +1 is for the additionnal ending \0. See below. */
- if (filesize + 1 > envsize) {
- fprintf(stderr, "The input file is larger than the environment partition size\n");
- return EXIT_FAILURE;
- }
- /* Replace newlines separating variables with \0 */
- for (fp = 0, ep = 0 ; fp < filesize ; fp++) {
+ /* Parse a byte at time until reaching the file OR until the environment fills
+ * up. Check ep against envsize - 1 to allow for extra trailing '\0'. */
+ for (fp = 0, ep = 0 ; fp < filesize && ep < envsize - 1; fp++) {
if (filebuf[fp] == '\n') {
- if (ep == 0) {
+ if (fp == 0 || filebuf[fp-1] == '\n') {
/*
- * Newlines at the beginning of the file ?
- * Ignore them.
+ * Skip empty lines.
*/
continue;
} else if (filebuf[fp-1] == '\\') {
/* End of a variable */
envptr[ep++] = '\0';
}
+ } else if ((fp == 0 || filebuf[fp-1] == '\n') && filebuf[fp] == '#') {
+ /* Comment, skip the line. */
+ while (++fp < filesize && filebuf[fp] != '\n')
+ continue;
} else {
envptr[ep++] = filebuf[fp];
}
}
+ /* If there are more bytes in the file still, it means the env filled up
+ * before parsing the whole file. Eat comments & whitespace here to see if
+ * there was anything meaning full left in the file, and if so, throw a error
+ * and exit. */
+ for( ; fp < filesize; fp++ )
+ {
+ if (filebuf[fp] == '\n') {
+ if (fp == 0 || filebuf[fp-1] == '\n') {
+ /* Ignore blank lines */
+ continue;
+ }
+ } else if ((fp == 0 || filebuf[fp-1] == '\n') && filebuf[fp] == '#') {
+ while (++fp < filesize && filebuf[fp] != '\n')
+ continue;
+ } else {
+ fprintf(stderr, "The environment file is too large for the target environment storage\n");
+ return EXIT_FAILURE;
+ }
+ }
/*
* Make sure there is a final '\0'
* And do it again on the next byte to mark the end of the environment.
projects / oweals / u-boot.git / blobdiff