strcmp(1): implements use of pledge(2)

src/npc.c

@@ -22,11 +22,6 @@
 #include <sysexits.h> /* EX_IOERR, EX_OK, EX_OSERR, EX_USAGE */
 #include <unistd.h> /* pledge(2), getopt(3) */
 
-#ifdef __OpenBSD__
-#	include <errno.h> /* errno */
-#	include <string.h> /* strerror(3) */
-#endif
-
 char *program_name = "npc";
 
 static int
@@ -48,7 +43,7 @@ int main(int argc, char *argv[]) {
 	program_name = argv[0] == NULL ? program_name : argv[0];
 
 	if (pledge("stdio", NULL) == -1) {
-		(void)fprintf(stderr, "%s: %s\n", program_name, strerror(errno));
+		perror(program_name);
 		return EX_OSERR;
 	}
 #endif

src/str.c

@@ -19,7 +19,7 @@
 
 #include <ctype.h>
 #include <stddef.h> /* NULL */
-#include <stdio.h> /* fprintf(3), perror(2) */
+#include <stdio.h> /* fprintf(3), perror(3) */
 #include <stdlib.h> /* size_t, EXIT_FAILURE */
 #include <string.h> /* strcmp(3) */
 #include <sysexits.h> /* EX_OSERR, EX_USAGE */

src/strcmp.c

@@ -16,20 +16,28 @@
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see https://www.gnu.org/licenses/.
  */
-#include <stdio.h> /* fprintf(3), stderr */
+#include <stdio.h> /* fprintf(3), perror(3), stderr */
-#include <sysexits.h> /* EX_OK, EX_USAGE */
+#include <sysexits.h> /* EX_OK, EX_OSERR, EX_USAGE */
+
+#ifdef __OpenBSD__
+#	include <unistd.h> /* pledge(2) */
+#endif
 
 char *program_name = "strcmp";
 
 int main(int argc, char *argv[]) {
+	program_name = argv[0] == NULL ? program_name : argv[0];
 	int i;
 
+#ifdef __OpenBSD__
+	if (pledge("stdio", NULL) != -1) {
+		perror(program_name);
+		return EX_OSERR;
+	}
+#endif
+
 	if (argc < 3) {
-		(void)fprintf(
+		(void)fprintf(stderr, "Usage: %s string string...\n", program_name);
-			stderr,
-			"Usage: %s string string...\n",
-			argv[0] == NULL ? program_name : argv[0]
-		);
 
 		return EX_USAGE;
 	}