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 <string.h>
  29 #include <errno.h>
  30 #include "glcpp.h"
  31
  32 extern int yydebug;
  33
  34 /* Read from fd until EOF and return a string of everything read.
  35  */
  36 static char *
  37 load_text_fd (void *ctx, int fd)
  38 {
  39 #define CHUNK 4096
  40         char *text = NULL;
  41         ssize_t text_size = 0;
  42         ssize_t total_read = 0;
  43         ssize_t bytes;
  44
  45         while (1) {
  46                 if (total_read + CHUNK + 1 > text_size) {
  47                         text_size = text_size ? text_size * 2 : CHUNK + 1;
  48                         text = talloc_realloc_size (ctx, text, text_size);
  49                         if (text == NULL) {
  50                                 fprintf (stderr, "Out of memory\n");
  51                                 return NULL;
  52                         }
  53                 }
  54                 bytes = read (fd, text + total_read, CHUNK);
  55                 if (bytes < 0) {
  56                         fprintf (stderr, "Error while reading: %s\n",
  57                                  strerror (errno));
  58                         talloc_free (text);
  59                         return NULL;
  60                 }
  61
  62                 if (bytes == 0) {
  63                         break;
  64                 }
  65
  66                 total_read += bytes;
  67         }
  68
  69         text[total_read] = '\0';
  70
  71         return text;
  72 }
  73
  74 static char *
  75 load_text_file(void *ctx, const char *filename)
  76 {
  77         char *text;
  78         int fd;
  79
  80         if (filename == NULL || strcmp (filename, "-") == 0)
  81                 return load_text_fd (ctx, STDIN_FILENO);
  82
  83         fd = open (filename, O_RDONLY);
  84         if (fd < 0) {
  85                 fprintf (stderr, "Failed to open file %s: %s\n",
  86                          filename, strerror (errno));
  87                 return NULL;
  88         }
  89
  90         text = load_text_fd (ctx, fd);
  91
  92         close(fd);
  93
  94         return text;
  95 }
  96
  97 int
  98 main (int argc, char *argv[])
  99 {
 100         char *filename = NULL;
 101         void *ctx = talloc(NULL, void*);
 102         char *info_log = talloc_strdup(ctx, "");
 103         const char *shader;
 104         int ret;
 105
 106         if (argc) {
 107                 filename = argv[1];
 108         }
 109
 110         shader = load_text_file (ctx, filename);
 111         if (shader == NULL)
 112            return 1;
 113
 114         ret = preprocess(ctx, &shader, &info_log, NULL);
 115
 116         printf("%s", shader);
 117         fprintf(stderr, "%s", info_log);
 118
 119         talloc_free(ctx);
 120
 121         return ret;
 122 }