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 <string.h>
  30 #include "sl_pp_public.h"
  31 #include "sl_pp_context.h"
  32
  33
  34 struct sl_pp_context *
  35 sl_pp_context_create(void)
  36 {
  37    struct sl_pp_context *context;
  38
  39    context = calloc(1, sizeof(struct sl_pp_context));
  40    if (!context) {
  41       return NULL;
  42    }
  43
  44    if (sl_pp_dict_init(context)) {
  45       sl_pp_context_destroy(context);
  46       return NULL;
  47    }
  48
  49    context->getc_buf = malloc(64 * sizeof(char));
  50    if (!context->getc_buf) {
  51       sl_pp_context_destroy(context);
  52       return NULL;
  53    }
  54
  55    context->macro_tail = &context->macro;
  56    context->if_ptr = SL_PP_MAX_IF_NESTING;
  57    context->if_value = 1;
  58    memset(context->error_msg, 0, sizeof(context->error_msg));
  59    context->line = 1;
  60    context->file = 0;
  61
  62    return context;
  63 }
  64
  65 void
  66 sl_pp_context_destroy(struct sl_pp_context *context)
  67 {
  68    if (context) {
  69       free(context->cstr_pool);
  70       sl_pp_macro_free(context->macro);
  71       free(context->getc_buf);
  72       free(context);
  73    }
  74 }
  75
  76 const char *
  77 sl_pp_context_error_message(const struct sl_pp_context *context)
  78 {
  79    return context->error_msg;
  80 }
  81
  82 int
  83 sl_pp_context_add_predefined(struct sl_pp_context *context,
  84                              const char *name,
  85                              const char *value)
  86 {
  87    struct sl_pp_predefined pre;
  88
  89    if (context->num_predefined == SL_PP_MAX_PREDEFINED) {
  90       return -1;
  91    }
  92
  93    pre.name = sl_pp_context_add_unique_str(context, name);
  94    if (pre.name == -1) {
  95       return -1;
  96    }
  97
  98    pre.value = sl_pp_context_add_unique_str(context, value);
  99    if (pre.value == -1) {
 100       return -1;
 101    }
 102
 103    context->predefined[context->num_predefined++] = pre;
 104    return 0;
 105 }
 106
 107 int
 108 sl_pp_context_add_unique_str(struct sl_pp_context *context,
 109                              const char *str)
 110 {
 111    unsigned int size;
 112    unsigned int offset = 0;
 113
 114    size = strlen(str) + 1;
 115
 116    /* Find out if this is a unique string. */
 117    while (offset < context->cstr_pool_len) {
 118       const char *str2;
 119       unsigned int size2;
 120
 121       str2 = &context->cstr_pool[offset];
 122       size2 = strlen(str2) + 1;
 123       if (size == size2 && !memcmp(str, str2, size - 1)) {
 124          return offset;
 125       }
 126
 127       offset += size2;
 128    }
 129
 130    if (context->cstr_pool_len + size > context->cstr_pool_max) {
 131       context->cstr_pool_max = (context->cstr_pool_len + size + 0xffff) & ~0xffff;
 132       context->cstr_pool = realloc(context->cstr_pool, context->cstr_pool_max);
 133    }
 134
 135    if (!context->cstr_pool) {
 136       strcpy(context->error_msg, "out of memory");
 137       return -1;
 138    }
 139
 140    offset = context->cstr_pool_len;
 141    memcpy(&context->cstr_pool[offset], str, size);
 142    context->cstr_pool_len += size;
 143
 144    return offset;
 145 }
 146
 147 const char *
 148 sl_pp_context_cstr(const struct sl_pp_context *context,
 149                    int offset)
 150 {
 151    if (offset == -1) {
 152       return NULL;
 153    }
 154    return &context->cstr_pool[offset];
 155 }