From 23b68d3a7356f9cf3182759fa559af58704497f0 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Wed, 13 Mar 2019 21:10:54 -0400
Subject: migrate to gitlab

---
 cmp.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 cmp.c

diff --git a/cmp.c b/cmp.c
new file mode 100644
index 0000000..6a03002
--- /dev/null
+++ b/cmp.c
@@ -0,0 +1,114 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2011-2017, Jakob Kaivo <jkk@ung.org>
+ *
+ * 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.
+ *
+ */
+
+#define _XOPEN_SOURCE 700
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+FILE *fileopen(const char *path)
+{
+	if (!strcmp(path, "-")) {
+		return stdin;
+	}
+
+	FILE *f = fopen(path, "rb");
+	if (f == NULL) {
+		fprintf(stderr, "cmp: Couldn't open %s: %s\n", path, strerror(errno));
+		exit(1);
+	}
+
+	return f;
+}
+
+int main(int argc, char *argv[])
+{
+	int c = 0;
+	enum { FIRSTONLY, ALL, SILENT } output = FIRSTONLY;
+
+	while ((c = getopt(argc, argv, "ls")) != EOF) {
+		switch (c) {
+		case 'l':
+			output = ALL;
+			break;
+
+		case 's':
+			output = SILENT;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (optind != argc - 2) {
+		fprintf(stderr, "cmp: Two files are required\n");
+		return 1;
+	}
+
+	char *file1 = argv[optind++];
+	char *file2 = argv[optind];
+	FILE *f1 = fileopen(file1);
+	FILE *f2 = fileopen(file2);
+
+	if (f1 == stdin && f2 == stdin) {
+		fprintf(stderr, "cmp: Comparing stdin to itself is undefined\n");
+		return 1;
+	}
+
+	struct stat st1;
+	fstat(fileno(f1), &st1);
+	if (S_ISBLK(st1.st_mode) || S_ISCHR(st1.st_mode) || S_ISFIFO(st1.st_mode)) {
+		struct stat st2;
+		fstat(fileno(f2), &st2);
+		if (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) {
+			fprintf(stderr, "cmp: Comparing special file to itself is undefined\n");
+			return 1;
+		}
+	}
+
+	for (int byte = 1, line = 1; !(feof(f1) || feof(f2)); byte++) {
+		int c1 = fgetc(f1);
+		int c2 = fgetc(f2);
+
+		if (c1 == c2) {
+			if (c1 == '\n') {
+				line++;
+			}
+			continue;
+		}
+
+		if (c1 == EOF && output != SILENT) {
+			fprintf(stderr, "cmp: EOF on %s\n", file1);
+		} else if (c2 == EOF && output != SILENT) {
+			fprintf(stderr, "cmp: EOF on %s\n", file2);
+		} else if (output == ALL) {
+			printf("%d %o %o\n", byte, c1, c2);
+			continue;
+		} else if (output != SILENT) {
+			printf("%s %s differ: char %d, line %d\n", file1, file2, byte, line);
+		}
+		return 1;
+	}
+
+	return 0;
+}
-- 
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