src/glsl/glcpp/glcpp.c

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include "glcpp.h"
  29
  30 extern int yydebug;
  31
  32 static char *
  33 load_text_file(void *ctx, const char *file_name)
  34 {
  35         char *text = NULL;
  36         struct stat st;
  37         ssize_t total_read = 0;
  38         int fd = file_name == NULL ? STDIN_FILENO : open(file_name, O_RDONLY);
  39
  40         if (fd < 0) {
  41                 return NULL;
  42         }
  43
  44         if (fstat(fd, & st) == 0) {
  45                 text = (char *) talloc_size(ctx, st.st_size + 1);
  46                 if (text != NULL) {
  47                         do {
  48                                 ssize_t bytes = read(fd, text + total_read,
  49                                                      st.st_size - total_read);
  50                                 if (bytes < 0) {
  51                                         text = NULL;
  52                                         break;
  53                                 }
  54
  55                                 if (bytes == 0) {
  56                                         break;
  57                                 }
  58
  59                                 total_read += bytes;
  60                         } while (total_read < st.st_size);
  61
  62                         text[total_read] = '\0';
  63                 }
  64         }
  65
  66         close(fd);
  67
  68         return text;
  69 }
  70
  71 int
  72 preprocess(void *talloc_ctx, const char **shader, char **info_log);
  73
  74 int
  75 main (void)
  76 {
  77         void *ctx = talloc(NULL, void*);
  78         const char *shader = load_text_file(ctx, NULL);
  79         char *info_log = talloc_strdup(ctx, "");
  80         int ret = preprocess(ctx, &shader, &info_log);
  81
  82         printf("%s", shader);
  83         fprintf(stderr, "%s", info_log);
  84
  85         talloc_free(ctx);
  86
  87         return ret;
  88 }