From: David Wagner Date: Fri, 13 Jan 2012 13:27:37 +0000 (+0000) Subject: mkenvimage: Read/Write from/to stdin/out by default or if the filename is "-" X-Git-Tag: v2012.04-rc1~17^2^2~9 X-Git-Url: https://git.kernelconcepts.de/?p=karo-tx-uboot.git;a=commitdiff_plain;h=48995b5a96c99ba6243906ecab733e4269fbafe5 mkenvimage: Read/Write from/to stdin/out by default or if the filename is "-" Signed-off-by: David Wagner Acked-by: Mike Frysinger --- diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c index b6879bcef7..032dc83652 100644 --- a/tools/mkenvimage.c +++ b/tools/mkenvimage.c @@ -171,15 +171,9 @@ int main(int argc, char **argv) memset(envptr, padbyte, envsize); /* Open the input file ... */ - if (optind >= argc) { - fprintf(stderr, "Please specify an input filename\n"); - return EXIT_FAILURE; - } - - txt_filename = argv[optind]; - if (strcmp(txt_filename, "-") == 0) { + if (optind >= argc || strcmp(argv[optind], "-") == 0) { int readbytes = 0; - int readlen = sizeof(*envptr) * 2048; + int readlen = sizeof(*envptr) * 4096; txt_fd = STDIN_FILENO; do { @@ -198,6 +192,7 @@ int main(int argc, char **argv) } while (readbytes == readlen); } else { + txt_filename = argv[optind]; txt_fd = open(txt_filename, O_RDONLY); if (txt_fd == -1) { fprintf(stderr, "Can't open \"%s\": %s\n", @@ -287,11 +282,16 @@ int main(int argc, char **argv) memcpy(dataptr, &targetendian_crc, sizeof(uint32_t)); - bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); - if (bin_fd == -1) { - fprintf(stderr, "Can't open output file \"%s\": %s\n", - bin_filename, strerror(errno)); - return EXIT_FAILURE; + if (!bin_filename || strcmp(bin_filename, "-") == 0) { + bin_fd = STDOUT_FILENO; + } else { + bin_fd = creat(bin_filename, S_IRUSR | S_IWUSR | S_IRGRP | + S_IWGRP); + if (bin_fd == -1) { + fprintf(stderr, "Can't open output file \"%s\": %s\n", + bin_filename, strerror(errno)); + return EXIT_FAILURE; + } } if (write(bin_fd, dataptr, sizeof(*dataptr) * datasize) !=