text.c

   1 /* agg - the news aggregator
   2  * Copyright (C) 2011 Andreas Waidler <arandes@programmers.at>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #include <string.h>
  17 #include "config.h"
  18 #include "stack.h"
  19 #include "expat.h"
  20 #include "text.h"
  21
  22 char buffer[TEXT_BUFFER_SIZE] = { 0 };
  23 char* cursor = buffer;
  24
  25 const char* text_get()
  26 {
  27         return buffer;
  28 }
  29
  30 void text_buffer(const char* str, size_t len)
  31 {
  32         /* We want to append a trailing \0, so we have one
  33          * element less. Beware, this will underflow! */
  34         size_t free = buffer + TEXT_BUFFER_SIZE - cursor - 1;
  35         size_t n   = len < free ? len : free;
  36
  37         /* Prevent overflow in memcpy(). */
  38         if (cursor == buffer + TEXT_BUFFER_SIZE) return;
  39
  40         memcpy(cursor, str, n);
  41         cursor += n;
  42         *cursor = 0;
  43 }
  44
  45 void text_enable()
  46 {
  47         expat_use_text_buffer = true;
  48         cursor = buffer;
  49         *cursor = 0;
  50 }
  51
  52 void text_disable()
  53 {
  54         expat_use_text_buffer = false;
  55         cursor = buffer;
  56         *cursor = 0;
  57 }