From 2c64b3fa1b30472dba90835a81a6d6c31ed878f5 Mon Sep 17 00:00:00 2001
From: "Bjarni R. Einarsson" <bre@klaki.net>
Date: Thu, 15 Sep 2016 13:14:23 +0200
Subject: [PATCH] New utils: free_outside() and zero_nth_char()

---
 libpagekite/pkutils.c | 16 ++++++++++++++++
 libpagekite/pkutils.h |  2 ++
 2 files changed, 18 insertions(+)

diff --git a/libpagekite/pkutils.c b/libpagekite/pkutils.c
index eb49c75..0e3bfc9 100644
--- a/libpagekite/pkutils.c
+++ b/libpagekite/pkutils.c
@@ -59,6 +59,22 @@ int zero_first_whitespace(int length, char* data)
   return 0;
 }
 
+int zero_nth_char(int n, char c, int length, char* data)
+{
+  int i;
+  for (i = 0; i < length; i++)
+  {
+    if (data[i] == c)
+    {
+      if (--n < 1) {
+        data[i] = '\0';
+        return i+1;
+      }
+    }
+  }
+  return 0;
+}
+
 char *skip_http_header(int length, const char* data)
 {
   int i, lfs;
diff --git a/libpagekite/pkutils.h b/libpagekite/pkutils.h
index e0176f1..51aac8a 100644
--- a/libpagekite/pkutils.h
+++ b/libpagekite/pkutils.h
@@ -19,9 +19,11 @@ Note: For alternate license terms, see the file COPYING.md.
 ******************************************************************************/
 
 #define strncpyz(dest, src, len) { strncpy(dest, src, len); dest[len] = '\0'; }
+#define free_outside(ptr, buf, len) { if ((ptr < buf) || (ptr >= buf+len)) free(ptr); }
 
 int zero_first_crlf(int, char*);
 int zero_first_whitespace(int, char*);
+int zero_nth_char(int, char, int, char*);
 char* skip_http_header(int, const char*);
 char* collapse_whitespace(char*);
 int dbg_write(int, char *, int);