diff options
Diffstat (limited to 'iceprog/iceprog.c')
| -rw-r--r-- | iceprog/iceprog.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/iceprog/iceprog.c b/iceprog/iceprog.c index 31b7a2f..7f0830c 100644 --- a/iceprog/iceprog.c +++ b/iceprog/iceprog.c @@ -31,6 +31,7 @@ #include <stdlib.h> #include <unistd.h> #include <string.h> +#include <getopt.h> #include <errno.h> #include <err.h> #include <sys/types.h> @@ -342,7 +343,6 @@ void help(const char *progname) fprintf(stderr, "This means that some data after the written data (or even before when -o is\n"); fprintf(stderr, "used) may be erased as well.\n"); fprintf(stderr, "\n"); - exit(1); } int main(int argc, char **argv) @@ -360,9 +360,15 @@ int main(int argc, char **argv) const char *devstr = NULL; enum ftdi_interface ifnum = INTERFACE_A; + static struct option long_options[] = { + {"help", no_argument, NULL, -2}, + {NULL, 0, NULL, 0} + }; + int opt; char *endptr; - while ((opt = getopt(argc, argv, "d:I:rR:o:cbnStv")) != -1) + while ((opt = getopt_long(argc, argv, "d:I:rR:o:cbnStv", + long_options, NULL)) != -1) { switch (opt) { @@ -419,8 +425,14 @@ int main(int argc, char **argv) case 'v': verbose = true; break; - default: + case -2: help(argv[0]); + return EXIT_SUCCESS; + default: + /* error message has already been printed */ + fprintf(stderr, "Try `%s --help' " + "for more information.\n", argv[0]); + return EXIT_FAILURE; } } |