From db7ed69f2ae8dcdf2308815bb899c86ff8cce04c Mon Sep 17 00:00:00 2001
From: Joris Vink <joris@coders.se>
Date: Wed, 7 Aug 2013 14:56:14 +0200
Subject: [PATCH] Add kore_buf_replace_string().

kore_buf_replace_string allows you to replace occurances of a certain
string with something else.

Example:
	char	*username = "Joris";

	page = kore_buf_create(static_len_html_profile);
	kore_buf_append(page, static_html_profile, static_len_html_profile);
	kore_buf_replace_string(page, "%name%", username, strlen(username));
---
 includes/kore.h |  2 ++
 src/buf.c       | 36 ++++++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+)

diff --git a/includes/kore.h b/includes/kore.h
index b0928ca..76d2c3b 100644
--- a/includes/kore.h
+++ b/includes/kore.h
@@ -346,6 +346,8 @@ u_int8_t	*kore_buf_release(struct kore_buf *, u_int32_t *);
 void	kore_buf_appendf(struct kore_buf *, const char *, ...);
 void	kore_buf_appendv(struct kore_buf *, struct buf_vec *, u_int16_t);
 void	kore_buf_appendb(struct kore_buf *, struct kore_buf *);
+void	kore_buf_replace_string(struct kore_buf *, const char *,
+	    u_int8_t *, size_t);
 
 struct spdy_header_block	*spdy_header_block_create(int);
 struct spdy_stream	*spdy_stream_lookup(struct connection *, u_int32_t);
diff --git a/src/buf.c b/src/buf.c
index dce2f4c..018b905 100644
--- a/src/buf.c
+++ b/src/buf.c
@@ -96,3 +96,39 @@ kore_buf_free(struct kore_buf *buf)
 	kore_mem_free(buf->data);
 	kore_mem_free(buf);
 }
+
+void
+kore_buf_replace_string(struct kore_buf *b, const char *src,
+    u_int8_t *dst, size_t len)
+{
+	u_int32_t	blen, off, off2;
+	size_t		nlen, klen;
+	char		*key, *end, *tmp, *p;
+
+	off = 0;
+	klen = strlen(src);
+	for (;;) {
+		blen = b->offset;
+		nlen = blen + len;
+		p = (char *)b->data;
+
+		if ((key = strstr((p + off), src)) == NULL)
+			break;
+
+		end = key + klen;
+		off = key - p;
+		off2 = ((char *)(b->data + b->offset) - end);
+
+		tmp = kore_malloc(nlen);
+		memcpy(tmp, p, off);
+		memcpy((tmp + off), dst, len);
+		memcpy((tmp + off + len), end, off2);
+
+		kore_mem_free(b->data);
+		b->data = (u_int8_t *)tmp;
+		b->offset = off + len + off2;
+		b->length = nlen;
+
+		off = off + len;
+	}
+}