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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  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  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    context->if_ptr = SL_PP_MAX_IF_NESTING;
  37    context->if_value = 1;
  38 }
  39
  40 void
  41 sl_pp_context_destroy(struct sl_pp_context *context)
  42 {
  43    free(context->cstr_pool);
  44    sl_pp_macro_free(context->macro);
  45 }
  46
  47 int
  48 sl_pp_context_add_unique_str(struct sl_pp_context *context,
  49                              const char *str)
  50 {
  51    unsigned int size;
  52    unsigned int offset = 0;
  53
  54    size = strlen(str) + 1;
  55
  56    /* Find out if this is a unique string. */
  57    while (offset < context->cstr_pool_len) {
  58       const char *str2;
  59       unsigned int size2;
  60
  61       str2 = &context->cstr_pool[offset];
  62       size2 = strlen(str2) + 1;
  63       if (size == size2 && !memcmp(str, str2, size - 1)) {
  64          return offset;
  65       }
  66
  67       offset += size2;
  68    }
  69
  70    if (context->cstr_pool_len + size > context->cstr_pool_max) {
  71       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
  72       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
  73    }
  74
  75    if (!context->cstr_pool) {
  76       return -1;
  77    }
  78
  79    offset = context->cstr_pool_len;
  80    memcpy(&context->cstr_pool[offset], str, size);
  81    context->cstr_pool_len += size;
  82
  83    return offset;
  84 }
  85
  86 const char *
  87 sl_pp_context_cstr(const struct sl_pp_context *context,
  88                    int offset)
  89 {
  90    if (offset == -1) {
  91       return NULL;
  92    }
  93    return &context->cstr_pool[offset];
  94 }