diff options
| -rw-r--r-- | tools/mkenvimage.c | 70 |
1 files changed, 21 insertions, 49 deletions
diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c index ffaebd5565c..a8eebab6c33 100644 --- a/tools/mkenvimage.c +++ b/tools/mkenvimage.c @@ -65,10 +65,12 @@ long int xstrtol(const char *s) 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; @@ -76,12 +78,11 @@ int main(int argc, char **argv) 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; @@ -156,62 +157,33 @@ int main(int argc, char **argv) /* 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, filesize + 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 (readbytes < 0) { - fprintf(stderr, "Error while reading stdin: %s\n", - strerror(errno)); - return EXIT_FAILURE; - } - filesize += readbytes; - } while (readbytes > 0); } 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); - } /* 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'. */ |