From 7326b6bc6b5607c854039c3379b429c91a89a601 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Thu, 15 Aug 2019 11:44:18 -0400
Subject: initial version

---
 tr.c | 134 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 tr.c

diff --git a/tr.c b/tr.c
new file mode 100644
index 0000000..8d355ea
--- /dev/null
+++ b/tr.c
@@ -0,0 +1,134 @@
+/*
+ * UNG's Not GNU
+ *
+ * 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 <errno.h>
+#include <limits.h>
+#include <locale.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+union trc {
+	unsigned char c;
+	struct {
+		unsigned int delete	:1;
+		unsigned int squeeze	:1;
+	};
+};
+
+enum {
+	COMPLEMENT_COLLATE	= 1 << 0,
+	COMPLEMENT_BINARY	= 1 << 1,
+	DELETE			= 1 << 2,
+	SQUEEZE			= 1 << 3,
+};
+
+static void init(union trc tr[], const char *s1, const char *s2, int flags)
+{
+	size_t l1 = strlen(s1);
+	size_t l2 = s2 ? strlen(s2) : 0;
+
+	for (size_t i = 0; i < UCHAR_MAX; i++) {
+		if (flags & (DELETE | SQUEEZE)) {
+			tr[i].delete = 0;
+			tr[i].squeeze = 0;
+		} else {
+			tr[i].c = i;
+		}
+	}
+
+	for (size_t i = 0; i < l1; i++) {
+		int c = s1[i];
+
+		if (flags & DELETE) {
+			tr[c].delete = 1;
+		} else if (flags & SQUEEZE) {
+			tr[c].squeeze = 1;
+		} else {
+			tr[c].c = s2[i];
+		}
+	}
+
+	if ((flags & DELETE) && (flags & SQUEEZE)) {
+		for (size_t i = 0; i < l2; i++) {
+			int c = s2[i];
+			tr[c].squeeze = 1;
+		}
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+	int flags = 0;
+
+	int c;
+	while ((c = getopt(argc, argv, "cCds")) != -1) {
+		switch (c) {
+		case 'c':
+			flags &= ~COMPLEMENT_COLLATE;
+			flags |= COMPLEMENT_BINARY;
+			break;
+
+		case 'C':
+			flags &= ~COMPLEMENT_BINARY;
+			flags |= COMPLEMENT_COLLATE;
+			break;
+
+		case 'd':
+			flags |= DELETE;
+			break;
+
+		case 's':
+			flags |= SQUEEZE;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (argc <= optind) {
+		fprintf(stderr, "tr: missing operand\n");
+		return 1;
+	}
+
+	union trc tr[UCHAR_MAX];
+	init(tr, argv[optind], argv[optind + 1], flags);
+
+	while ((c = getchar()) != EOF) {
+		if (flags & DELETE) {
+			if (!tr[c].delete) {
+				putchar(c);
+			}
+		} else {
+			if (flags & SQUEEZE) {
+			}
+			putchar(tr[c].c);
+		}
+	}
+
+	return 0;
+}
-- 
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