native_client_sdk/src/libraries/error_handling/string_stream.c

   1 /* Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2  * Use of this source code is governed by a BSD-style license that can be
   3  * found in the LICENSE file. */
   4
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <string.h>
   8
   9 #include "error_handling/string_stream.h"
  10 void ssinit(sstream_t* stream) {
  11   stream->data = NULL;
  12   stream->length = 0;
  13 }
  14
  15 void ssfree(sstream_t* stream) {
  16   free(stream->data);
  17   stream->data = 0;
  18   stream->length = 0;
  19 }
  20
  21 int ssvprintf(sstream_t* stream, const char* format, va_list args) {
  22   va_list hold;
  23   int len;
  24   char* outstr;
  25
  26   va_copy(hold, args);
  27   len = vsnprintf(NULL, 0, format, args);
  28
  29   outstr = malloc(stream->length + len + 1);
  30   if (stream->data) {
  31     memcpy(outstr, stream->data, stream->length);
  32     free(stream->data);
  33   }
  34
  35   stream->data = outstr;
  36   vsprintf(&stream->data[stream->length], format, hold);
  37   stream->length += len;
  38
  39   return len;
  40 }
  41
  42 int ssprintf(sstream_t* stream, const char* format, ...) {
  43   int out;
  44   va_list args;
  45   va_start(args, format);
  46   out = ssvprintf(stream, format, args);
  47   va_end(args);
  48
  49   return out;
  50 }