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scrut(1): further error-proofing

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This commit is contained in:
dtb 2024-08-10 22:24:32 -06:00
parent da190f713c
commit 98c4d94f6d
Signed by: trinity
GPG Key ID: 34C0543BBB6AF81B
1 changed files with 7 additions and 2 deletions
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9
src/scrut.c
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@ -17,6 +17,7 @@
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
#include <assert.h> /* assert(3) */
#include <stdio.h> /* fprintf(3), stderr, NULL */
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS */
#include <string.h> /* memset(3), strchr(3) */
@ -29,6 +30,7 @@
char *program_name = "scrut";
#define OPTS "bcdefgkprsuwxLS"
/* this is an array so main:sel's size can be known at compile time */
static char opts[] = OPTS;
static int
@ -58,7 +60,10 @@ int main(int argc, char *argv[]) {
memset(sel, '\0', sizeof sel);
for (int c; (c = getopt(argc, argv, opts)) != -1;) {
if ((p = strchr(opts, c)) == NULL) { return usage(argv[0]); }
else { sel[p - opts] = c; }
else {
assert(p - opts < sizeof sel / sizeof *sel); /* bounds check */
sel[p - opts] = c;
}
}
/* straighten out selections; permute out nulls */
@ -73,7 +78,7 @@ int main(int argc, char *argv[]) {
if (optind == argc) { return usage(argv[0]); }
for (argv += optind ; *argv != NULL; ++argv) {
for (argv += optind ; *argv != NULL; argv = &argv[1]) {
struct stat buf;
#ifdef __OpenBSD__