src/glsl/pp/sl_pp_context.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
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  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
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  26  **************************************************************************/
  27
  28 #include <stdlib.h>
  29 #include "sl_pp_context.h"
  30
  31
  32 void
  33 sl_pp_context_init(struct sl_pp_context *context)
  34 {
  35    memset(context, 0, sizeof(struct sl_pp_context));
  36 }
  37
  38 void
  39 sl_pp_context_destroy(struct sl_pp_context *context)
  40 {
  41    free(context->cstr_pool);
  42    sl_pp_macro_free(context->macro);
  43 }
  44
  45 int
  46 sl_pp_context_add_str(struct sl_pp_context *context,
  47                       const char *str)
  48 {
  49    unsigned int size;
  50    unsigned int offset;
  51
  52    size = strlen(str) + 1;
  53
  54    if (context->cstr_pool_len + size > context->cstr_pool_max) {
  55       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
  56       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
  57    }
  58
  59    if (!context->cstr_pool) {
  60       return -1;
  61    }
  62
  63    offset = context->cstr_pool_len;
  64    memcpy(&context->cstr_pool[offset], str, size);
  65    context->cstr_pool_len += size;
  66
  67    return offset;
  68 }
  69
  70 const char *
  71 sl_pp_context_cstr(const struct sl_pp_context *context,
  72                    int offset)
  73 {
  74    if (offset == -1) {
  75       return NULL;
  76    }
  77    return &context->cstr_pool[offset];
  78 }