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