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,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  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->macro_tail = &context->macro;
  37    context->if_ptr = SL_PP_MAX_IF_NESTING;
  38    context->if_value = 1;
  39    memset(context->error_msg, 0, sizeof(context->error_msg));
  40    context->line = 1;
  41    context->file = 0;
  42 }
  43
  44 void
  45 sl_pp_context_destroy(struct sl_pp_context *context)
  46 {
  47    free(context->cstr_pool);
  48    sl_pp_macro_free(context->macro);
  49 }
  50
  51 int
  52 sl_pp_context_add_unique_str(struct sl_pp_context *context,
  53                              const char *str)
  54 {
  55    unsigned int size;
  56    unsigned int offset = 0;
  57
  58    size = strlen(str) + 1;
  59
  60    /* Find out if this is a unique string. */
  61    while (offset < context->cstr_pool_len) {
  62       const char *str2;
  63       unsigned int size2;
  64
  65       str2 = &context->cstr_pool[offset];
  66       size2 = strlen(str2) + 1;
  67       if (size == size2 && !memcmp(str, str2, size - 1)) {
  68          return offset;
  69       }
  70
  71       offset += size2;
  72    }
  73
  74    if (context->cstr_pool_len + size > context->cstr_pool_max) {
  75       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
  76       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
  77    }
  78
  79    if (!context->cstr_pool) {
  80       return -1;
  81    }
  82
  83    offset = context->cstr_pool_len;
  84    memcpy(&context->cstr_pool[offset], str, size);
  85    context->cstr_pool_len += size;
  86
  87    return offset;
  88 }
  89
  90 const char *
  91 sl_pp_context_cstr(const struct sl_pp_context *context,
  92                    int offset)
  93 {
  94    if (offset == -1) {
  95       return NULL;
  96    }
  97    return &context->cstr_pool[offset];
  98 }