Add ttpre

1 files changed, 54 insertions, 0 deletions

diff --git a/bin/ttpre.c b/bin/ttpre.c
new file mode 100644
index 00000000..85654d4b
--- /dev/null
+++ b/bin/ttpre.c
@@ -0,0 +1,54 @@
+/* Copyright (C) 2018  June McEnroe <june@causal.agency>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static void put(const char *tag, char ch) {
+	if (tag) printf("<%s>", tag);
+	switch (ch) {
+		break; case '&': printf("&amp;");
+		break; case '<': printf("&lt;");
+		break; case '>': printf("&gt;");
+		break; default:  printf("%c", ch);
+	}
+	if (tag) printf("</%s>", tag);
+}
+
+static void push(char ch) {
+	static char q[3];
+	if (q[1] == '\b' && q[0] == '_') {
+		put("i", q[2]);
+		memset(q, 0, 3);
+	} else if (q[1] == '\b' && q[0] == q[2]) {
+		put("b", q[2]);
+		memset(q, 0, 3);
+	} else if (q[0]) {
+		put(NULL, q[0]);
+	}
+	memmove(q, &q[1], 2);
+	q[2] = ch;
+}
+
+int main() {
+	printf("<pre>");
+	char ch;
+	while (EOF != (ch = getchar_unlocked())) push(ch);
+	push('\0'); push('\0'); push('\0');
+	printf("</pre>\n");
+	return EXIT_SUCCESS;
+}