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