From: Kevin McCarthy <kevin@8t8.us>
Date: Sat, 26 May 2018 21:46:16 +0000 (-0700)
Subject: Create mutt_buffer_increase_size() function
X-Git-Tag: 2019-10-25~671^2~11
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=a3451f2fd99ba3ee19796dbe43b2a0fe2c42a0b1;p=neomutt

Create mutt_buffer_increase_size() function

This will allow preallocating buffers that we know are going to be
big for qresync support.

This will also be useful for buffer pools later on.
---

diff --git a/mutt/buffer.c b/mutt/buffer.c
index b47bb8abf..3cb89c210 100644
--- a/mutt/buffer.c
+++ b/mutt/buffer.c
@@ -254,3 +254,15 @@ struct Buffer *mutt_buffer_alloc(size_t size)
 
   return b;
 }
+
+/* Increases the allocated size of the buffer */
+void mutt_buffer_increase_size(struct Buffer *buf, size_t new_size)
+{
+  if (new_size > buf->dsize)
+  {
+    size_t offset = buf->dptr - buf->data;
+    buf->dsize = new_size;
+    mutt_mem_realloc(&buf->data, buf->dsize);
+    buf->dptr = buf->data + offset;
+  }
+}
diff --git a/mutt/buffer.h b/mutt/buffer.h
index e4b8ac9c6..330a56c27 100644
--- a/mutt/buffer.h
+++ b/mutt/buffer.h
@@ -46,6 +46,7 @@ size_t         mutt_buffer_addstr(struct Buffer *buf, const char *s);
 struct Buffer *mutt_buffer_alloc(size_t size);
 void           mutt_buffer_free(struct Buffer **p);
 struct Buffer *mutt_buffer_from(const char *seed);
+void           mutt_buffer_increase_size(struct Buffer *buf, size_t new_size);
 struct Buffer *mutt_buffer_init(struct Buffer *b);
 bool           mutt_buffer_is_empty(const struct Buffer *buf);
 struct Buffer *mutt_buffer_new(void);