1 files changed, 35 insertions, 0 deletions
diff --git a/escape.c b/escape.c
new file mode 100644
index 0000000..be801e2
--- /dev/null
+++ b/escape.c
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+
+#include "request.h"
+
+char *real_escape_string(const byte *src, int size)
+{
+    char *escaped;
+    char *pos;
+
+    if (memchr(src, '\0', size - 1) || memchr(src, '\n', size) || memchr(src, '\r', size)) {
+	fprintf(stderr, "cannot handle this string\n");
+	return NULL;
+    }
+
+    pos = escaped = malloc(sizeof(char) * (size * 2 + 1));
+
+    if (escaped == NULL) {
+	fprintf(stderr, "malloc failed: %m\n");
+	return NULL;
+    }
+
+    for (int i = 0; i < size; ++i) {
+	if (!isalnum(src[i])) {
+	    *escaped++ = '\\';
+	}
+	*escaped++ = src[i];
+    }
+
+    *escaped = '\0';
+
+    return pos;
+}