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
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  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 int
  33 sl_pp_context_init(struct sl_pp_context *context)
  34 {
  35    memset(context, 0, sizeof(struct sl_pp_context));
  36
  37    if (sl_pp_dict_init(context)) {
  38       sl_pp_context_destroy(context);
  39       return -1;
  40    }
  41
  42    context->macro_tail = &context->macro;
  43    context->if_ptr = SL_PP_MAX_IF_NESTING;
  44    context->if_value = 1;
  45    memset(context->error_msg, 0, sizeof(context->error_msg));
  46    context->line = 1;
  47    context->file = 0;
  48
  49    return 0;
  50 }
  51
  52 void
  53 sl_pp_context_destroy(struct sl_pp_context *context)
  54 {
  55    free(context->cstr_pool);
  56    sl_pp_macro_free(context->macro);
  57 }
  58
  59 int
  60 sl_pp_context_add_unique_str(struct sl_pp_context *context,
  61                              const char *str)
  62 {
  63    unsigned int size;
  64    unsigned int offset = 0;
  65
  66    size = strlen(str) + 1;
  67
  68    /* Find out if this is a unique string. */
  69    while (offset < context->cstr_pool_len) {
  70       const char *str2;
  71       unsigned int size2;
  72
  73       str2 = &context->cstr_pool[offset];
  74       size2 = strlen(str2) + 1;
  75       if (size == size2 && !memcmp(str, str2, size - 1)) {
  76          return offset;
  77       }
  78
  79       offset += size2;
  80    }
  81
  82    if (context->cstr_pool_len + size > context->cstr_pool_max) {
  83       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
  84       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
  85    }
  86
  87    if (!context->cstr_pool) {
  88       strcpy(context->error_msg, "out of memory");
  89       return -1;
  90    }
  91
  92    offset = context->cstr_pool_len;
  93    memcpy(&context->cstr_pool[offset], str, size);
  94    context->cstr_pool_len += size;
  95
  96    return offset;
  97 }
  98
  99 const char *
 100 sl_pp_context_cstr(const struct sl_pp_context *context,
 101                    int offset)
 102 {
 103    if (offset == -1) {
 104       return NULL;
 105    }
 106    return &context->cstr_pool[offset];
 107 }