src/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 <assert.h>
  18 #include "config.h"
  19 #include "stack.h"
  20 #include "expat.h"
  21 #include "text.h"
  22
  23 char buffer[TEXT_BUFFER_SIZE] = { 0 };
  24 char* cursor = buffer;
  25
  26 const char* text_get()
  27 {
  28         return buffer;
  29 }
  30
  31 void text_buffer(const char* str, size_t len)
  32 {
  33         /* We want to append a trailing \0, so we have one
  34          * element less. Beware, this will underflow! */
  35         size_t free = buffer + TEXT_BUFFER_SIZE - cursor - 1;
  36         size_t n   = len < free ? len : free;
  37
  38         /* Already full? Prevent overflow in memcpy(). */
  39         if (cursor == buffer + TEXT_BUFFER_SIZE) return;
  40
  41         assert(cursor + n < buffer + TEXT_BUFFER_SIZE);
  42         memcpy(cursor, str, n);
  43
  44         cursor += n;
  45         *cursor = 0;
  46 }
  47
  48 void text_enable()
  49 {
  50         expat_use_text_buffer = true;
  51
  52         cursor = buffer;
  53         *cursor = 0;
  54 }
  55
  56 void text_disable()
  57 {
  58         expat_use_text_buffer = false;
  59
  60         cursor = buffer;
  61         *cursor = 0;
  62 }