os: Add a growable string stream.

src/gallium/auxiliary/Makefile

@@ -50,6 +50,7 @@ C_SOURCES = \
 	indices/u_unfilled_gen.c \
 	os/os_misc.c \
 	os/os_stream_stdc.c \
+	os/os_stream_str.c \
 	os/os_stream_null.c \
 	os/os_time.c \
 	pipebuffer/pb_buffer_malloc.c \

src/gallium/auxiliary/SConscript

@@ -84,6 +84,7 @@ source = [
     'indices/u_unfilled_gen.c',
     'os/os_misc.c',
     'os/os_stream_stdc.c',
+    'os/os_stream_str.c',
     'os/os_stream_null.c',
     'os/os_time.c',
     'pipebuffer/pb_buffer_fenced.c',

src/gallium/auxiliary/os/os_stream.h

@@ -99,6 +99,17 @@ struct os_stream *
 os_null_stream_create(void);
 
 
+struct os_stream *
+os_str_stream_create(size_t initial_size);
+
+
+const char *
+os_str_stream_get(struct os_stream *stream);
+
+char *
+os_str_stream_get_and_close(struct os_stream *stream);
+
+
 #if defined(PIPE_SUBSYSTEM_WINDOWS_DISPLAY)
 #define os_file_stream_create(_filename) os_null_stream_create()
 #endif

src/gallium/auxiliary/os/os_stream_str.c

@@ -0,0 +1,166 @@
+/**************************************************************************
+ *
+ * Copyright 2008-2010 VMware, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Stream implementation based on the Standard C Library.
+ */
+
+#include "pipe/p_config.h"
+
+#include "os_memory.h"
+#include "os_stream.h"
+
+
+struct os_str_stream
+{
+   struct os_stream base;
+
+   char *str;
+
+   size_t size;
+   size_t written;
+};
+
+
+static INLINE struct os_str_stream *
+os_str_stream(struct os_stream *stream)
+{
+   return (struct os_str_stream *)stream;
+}
+
+
+static void
+os_str_stream_close(struct os_stream *_stream)
+{
+   struct os_str_stream *stream = os_str_stream(_stream);
+
+   os_free(stream->str);
+
+   os_free(stream);
+}
+
+
+static boolean
+os_str_stream_write(struct os_stream *_stream, const void *data, size_t size)
+{
+   struct os_str_stream *stream = os_str_stream(_stream);
+   size_t minimum_size;
+   boolean ret = TRUE;
+
+   minimum_size = stream->written + size + 1;
+   if (stream->size < minimum_size) {
+      size_t new_size = stream->size;
+      char * new_str;
+
+      do {
+         new_size *= 2;
+      } while (new_size < minimum_size);
+
+      new_str = os_realloc(stream->str, stream->size, new_size);
+      if (new_str) {
+         stream->str = new_str;
+         stream->size = new_size;
+      }
+      else {
+         size = stream->size - stream->written - 1;
+         ret = FALSE;
+      }
+   }
+
+   memcpy(stream->str + stream->written, data, size);
+   stream->written += size;
+
+   return ret;
+}
+
+
+static void
+os_str_stream_flush(struct os_stream *stream)
+{
+   (void)stream;
+}
+
+
+struct os_stream *
+os_str_stream_create(size_t size)
+{
+   struct os_str_stream *stream;
+
+   stream = (struct os_str_stream *)os_calloc(1, sizeof(*stream));
+   if(!stream)
+      goto no_stream;
+
+   stream->base.close = &os_str_stream_close;
+   stream->base.write = &os_str_stream_write;
+   stream->base.flush = &os_str_stream_flush;
+
+   stream->str = os_malloc(size);
+   if(!stream->str)
+      goto no_str;
+
+   stream->size = size;
+
+   return &stream->base;
+
+no_str:
+   os_free(stream);
+no_stream:
+   return NULL;
+}
+
+
+const char *
+os_str_stream_get(struct os_stream *_stream)
+{
+   struct os_str_stream *stream = os_str_stream(_stream);
+
+   if (!stream)
+      return NULL;
+
+   stream->str[stream->written] = 0;
+   return stream->str;
+}
+
+
+char *
+os_str_stream_get_and_close(struct os_stream *_stream)
+{
+   struct os_str_stream *stream = os_str_stream(_stream);
+   char *str;
+
+   if (!stream)
+      return NULL;
+
+   str = stream->str;
+
+   str[stream->written] = 0;
+
+   os_free(stream);
+
+   return str;
+}