From 1a520f3c6af55686787656f561548d96a82d01cb Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Sun, 4 Aug 2019 17:15:20 -0400
Subject: update license and clean up a bit

---
 strings.c | 95 +++++++++++++++++++++++++++++++++++++++------------------------
 1 file changed, 59 insertions(+), 36 deletions(-)

diff --git a/strings.c b/strings.c
index f4245b1..02158f5 100644
--- a/strings.c
+++ b/strings.c
@@ -1,33 +1,45 @@
 /*
  * UNG's Not GNU
- * 
- * Copyright (c) 2011, Jakob Kaivo <jakob@kaivo.net>
- * 
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  *
+ * Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
  */
 
+#define _POSIX_C_SOURCE 2
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <ctype.h>
-#include <getopt.h>
+#include <unistd.h>
 
-const char *strings_desc = "find printable strings in files";
-const char *strings_inv = "strings [-a] [-t format] -[n number] [file...]";
-
-static int strings(FILE * f, int number, char format)
+static int strings(const char *path, int number, char format)
 {
+	FILE *f = stdin;
+	if (path && strcmp(path, "-")) {
+		f = fopen(path, "rb");
+	}
+
+	if (f == NULL) {
+		return 1;
+	}
+
 	char buf[BUFSIZ];
 	char tbuf[BUFSIZ];
 	int nread;
@@ -67,50 +79,61 @@ static int strings(FILE * f, int number, char format)
 			offset++;
 		}
 	}
+
+	if (f != stdin) {
+		fclose(f);
+	}
+
 	return 0;
 }
 
-int main(int argc, char **argv)
+int main(int argc, char *argv[])
 {
 	int c;
 	int number = 4;
 	char format = 0;
 	char *end;
 
-	while ((c = getopt(argc, argv, ":an:t:")) != -1) {
+	while ((c = getopt(argc, argv, "an:t:")) != -1) {
 		switch (c) {
 		case 'a':
-			// Always scan the entire file
+			/* Ignored. Always scan the whole file. */
 			break;
+
 		case 'n':
 			number = strtol(optarg, &end, 10);
 			if (end != NULL && strlen(end) > 0)
 				return 1;
 			break;
+
 		case 't':
-			if (strlen(optarg) != 1)
+			if (strlen(optarg) != 1) {
+				fprintf(stderr, "strings: invalid format %s\n", optarg);
 				return 1;
+			}
+			switch (optarg[0]) {
+			case 'd':
+			case 'o':
+			case 'x':
+				/* OK */
+				break;
+
+			default:
+				fprintf(stderr, "strings: invalid format %s\n", optarg);
+			}
 			format = optarg[0];
 			break;
+
 		default:
 			return 1;
 		}
 	}
 
-	if ((format != 0 && format != 'd' && format != 'o' && format != 'x')
-	    || number < 1)
-		return 1;
-
-	if (optind >= argc) {
-		strings(stdin, number, format);
-	}
+	int ret = 0;
 
-	while (optind < argc) {
-		FILE *f = fopen(argv[optind], "r");
-		strings(f, number, format);
-		fclose(f);
-		optind++;
-	}
+	do {
+		ret |= strings(argv[optind], number, format);
+	} while (optind++ < argc);
 
 	return 0;
 }
-- 
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