From 4fae25ec557ca4fd79edc553f75a688d1fc80e20 Mon Sep 17 00:00:00 2001
From: Andy Spencer <andy753421@gmail.com>
Date: Sun, 22 Nov 2009 08:25:06 +0000
Subject: [PATCH] Add escaping printf specifier

---
 .gitignore |  1 +
 lib.c      | 43 +++++++++++++++++++++++++++++++++++++++++++
 mkfile     |  4 +++-
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 lib.c

diff --git a/.gitignore b/.gitignore
index 1a42267..a4007cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 *.o
 *~
 ct
+lib
 parse.[ch]
 scan.c
diff --git a/lib.c b/lib.c
new file mode 100644
index 0000000..7b46a05
--- /dev/null
+++ b/lib.c
@@ -0,0 +1,43 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <printf.h>
+
+static int printf_markup(FILE *stream,
+		const struct printf_info *info,
+		const void *const *args)
+{
+	int len = 0;
+	const char *str = *(const char **)args[0];
+	for (int i = 0; str[i]; i++)
+		switch (str[i]) {
+		case '"':  len += fputs("&#39;",  stream); break;
+		case '\'': len += fputs("&quot;", stream); break;
+		case '&':  len += fputs("&amp;",  stream); break;
+		case '<':  len += fputs("&lt;",   stream); break;
+		case '>':  len += fputs("&gt;",   stream); break;
+		default:   len += fputc(str[i],   stream); break;
+		}
+	return len;
+}
+
+static int printf_markup_arginfo(const struct printf_info *info,
+		size_t n, int *argtypes, int *size)
+{
+	argtypes[0] = PA_STRING;
+	return 1;
+}
+
+void ct_use_escape()
+{
+	register_printf_specifier('M', printf_markup, printf_markup_arginfo);
+}
+
+int main(void)
+{
+	ct_use_escape();
+	printf("%M\n", "<Hello, World>");
+	printf("%M\n", "<Hello, World>");
+	printf("%M\n", "<Hello, World>");
+	return 0;
+}
diff --git a/mkfile b/mkfile
index c7e4898..db6213b 100644
--- a/mkfile
+++ b/mkfile
@@ -1,5 +1,7 @@
-PROGS=ct
+PROGS=ct lib
 PKGS=glib-2.0
+lib-test:V: lib
+	./lib
 ct-test:V: ct
 	./ct < example/html.ct
 ct: ct.o parse.o scan.o
-- 
2.43.2