1 files changed, 73 insertions, 0 deletions

diff --git a/lib.c b/lib.c
new file mode 100644
index 0000000..2dea5a9
--- /dev/null
+++ b/lib.c
@@ -0,0 +1,73 @@
+#include <ctype.h>
+// functions from http://git.sijanec.eu/sijanec/sear.c
+static int urlencode (char * o, const char * i /* o must have at least strlen(i)*3+1 bytes of memory allocated */) {
+	if (!o || !i)
+		return -2;
+	size_t written = 0; /* o CANNOT be equal to i, unlike in urldecode */
+	for (; *i; i++) {
+		if (isalnum(*i) || *i == '.' || *i == '_' || *i == '-' || *i == '~') {
+			o[written++] = *i;
+		} else {
+			sprintf(o+written, "%%%02X", (unsigned char) *i);
+			written += 3;
+		}
+	}
+	o[written++] = '\0';
+	return 1;
+}
+__attribute__((unused)) static int urldecode (char * o, const char * i /* o must have at least strlen(i)+1 bytes memory allocated */) {
+	if (!o || !i)
+		return -2;
+	size_t written = 0; /* o can be equal to i for decoding in-place */
+	char buf[] = "00";
+	for (; *i; i++) {
+		if (*i == '%') {
+			buf[0] = *++i;
+			buf[1] = *++i;
+			if (!buf[0] || !buf[1]) { /* malformed */
+				o[written++] = '\0';
+				return -1;
+			}
+			o[written++] = strtol(buf, NULL, 16);
+		} else {
+			o[written++] = *i;
+		}
+	}
+	o[written++] = '\0';
+	return 1;
+}
+static char * htmlspecialchars (const char * i) { /* remember to free the output */
+	if (!i)
+		return NULL;
+	size_t s = 128;
+	char * o = malloc(s);
+	if (!o)
+		return NULL;
+	size_t w = 0;
+	for (; *i; i++) {
+		if (s - w <= 10) {
+			char * old = o;
+			o = realloc(o, (s *= 1.5));
+			if (!o) {
+				free(old);
+				return NULL;
+			}
+		}
+		switch (*i) {
+			case '<':
+				w += sprintf(o+w, "&lt;");
+				break;
+			case '"':
+				w += sprintf(o+w, "&quot;");
+				break;
+			case '\'':
+				w += sprintf(o+w, "&apos;");
+				break;
+			default:
+				o[w++] = *i;
+				break;
+		}
+	}
+	o[w++] = '\0';
+	return o;
+}