src/glsl/pp/sl_pp_version.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 #include "sl_pp_token.h"
  33
  34
  35 int
  36 sl_pp_version(struct sl_pp_context *context,
  37               unsigned int *version)
  38 {
  39    struct sl_pp_token_peek peek;
  40    unsigned int line = context->line;
  41
  42    /* Default values if `#version' is not present. */
  43    *version = 110;
  44
  45    if (sl_pp_token_peek_init(&peek, &context->tokens)) {
  46       return -1;
  47    }
  48
  49    /* There can be multiple `#version' directives present.
  50     * Accept the value of the last one.
  51     */
  52    for (;;) {
  53       struct sl_pp_token_info input;
  54       int found_hash = 0;
  55       int found_version = 0;
  56       int found_number = 0;
  57       int found_end = 0;
  58
  59       /* Skip whitespace and newlines and seek for hash. */
  60       while (!found_hash) {
  61          if (sl_pp_token_peek_get(&peek, &input)) {
  62             sl_pp_token_peek_destroy(&peek);
  63             return -1;
  64          }
  65
  66          switch (input.token) {
  67          case SL_PP_NEWLINE:
  68             line++;
  69             break;
  70
  71          case SL_PP_WHITESPACE:
  72             break;
  73
  74          case SL_PP_HASH:
  75             found_hash = 1;
  76             break;
  77
  78          default:
  79             sl_pp_token_peek_destroy(&peek);
  80             return 0;
  81          }
  82       }
  83
  84       /* Skip whitespace and seek for `version'. */
  85       while (!found_version) {
  86          if (sl_pp_token_peek_get(&peek, &input)) {
  87             sl_pp_token_peek_destroy(&peek);
  88             return -1;
  89          }
  90
  91          switch (input.token) {
  92          case SL_PP_WHITESPACE:
  93             break;
  94
  95          case SL_PP_IDENTIFIER:
  96             if (input.data.identifier != context->dict.version) {
  97                sl_pp_token_peek_destroy(&peek);
  98                return 0;
  99             }
 100             found_version = 1;
 101             break;
 102
 103          default:
 104             sl_pp_token_peek_destroy(&peek);
 105             return 0;
 106          }
 107       }
 108
 109       sl_pp_token_peek_commit(&peek);
 110
 111       /* Skip whitespace and seek for version number. */
 112       while (!found_number) {
 113          if (sl_pp_token_buffer_get(&context->tokens, &input)) {
 114             sl_pp_token_peek_destroy(&peek);
 115             return -1;
 116          }
 117
 118          switch (input.token) {
 119          case SL_PP_WHITESPACE:
 120             break;
 121
 122          case SL_PP_UINT:
 123             *version = atoi(sl_pp_context_cstr(context, input.data._uint));
 124             found_number = 1;
 125             break;
 126
 127          default:
 128             strcpy(context->error_msg, "expected version number after `#version'");
 129             sl_pp_token_peek_destroy(&peek);
 130             return -1;
 131          }
 132       }
 133
 134       /* Skip whitespace and seek for either newline or eof. */
 135       while (!found_end) {
 136          if (sl_pp_token_buffer_get(&context->tokens, &input)) {
 137             sl_pp_token_peek_destroy(&peek);
 138             return -1;
 139          }
 140
 141          switch (input.token) {
 142          case SL_PP_WHITESPACE:
 143             break;
 144
 145          case SL_PP_NEWLINE:
 146             line++;
 147             /* pass thru */
 148          case SL_PP_EOF:
 149             context->line = line;
 150             found_end = 1;
 151             break;
 152
 153          default:
 154             strcpy(context->error_msg, "expected end of line after version number");
 155             sl_pp_token_peek_destroy(&peek);
 156             return -1;
 157          }
 158       }
 159    }
 160
 161    /* Should not get here. */
 162 }