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 #include "main/mtypes.h"
  32 #include "main/shaderobj.h"
  33
  34 extern int yydebug;
  35
  36 void
  37 _mesa_reference_shader(struct gl_context *ctx, struct gl_shader **ptr,
  38                        struct gl_shader *sh)
  39 {
  40    *ptr = sh;
  41 }
  42
  43 /* Read from fd until EOF and return a string of everything read.
  44  */
  45 static char *
  46 load_text_fd (void *ctx, int fd)
  47 {
  48 #define CHUNK 4096
  49         char *text = NULL;
  50         ssize_t text_size = 0;
  51         ssize_t total_read = 0;
  52         ssize_t bytes;
  53
  54         while (1) {
  55                 if (total_read + CHUNK + 1 > text_size) {
  56                         text_size = text_size ? text_size * 2 : CHUNK + 1;
  57                         text = talloc_realloc_size (ctx, text, text_size);
  58                         if (text == NULL) {
  59                                 fprintf (stderr, "Out of memory\n");
  60                                 return NULL;
  61                         }
  62                 }
  63                 bytes = read (fd, text + total_read, CHUNK);
  64                 if (bytes < 0) {
  65                         fprintf (stderr, "Error while reading: %s\n",
  66                                  strerror (errno));
  67                         talloc_free (text);
  68                         return NULL;
  69                 }
  70
  71                 if (bytes == 0) {
  72                         break;
  73                 }
  74
  75                 total_read += bytes;
  76         }
  77
  78         text[total_read] = '\0';
  79
  80         return text;
  81 }
  82
  83 static char *
  84 load_text_file(void *ctx, const char *filename)
  85 {
  86         char *text;
  87         int fd;
  88
  89         if (filename == NULL || strcmp (filename, "-") == 0)
  90                 return load_text_fd (ctx, STDIN_FILENO);
  91
  92         fd = open (filename, O_RDONLY);
  93         if (fd < 0) {
  94                 fprintf (stderr, "Failed to open file %s: %s\n",
  95                          filename, strerror (errno));
  96                 return NULL;
  97         }
  98
  99         text = load_text_fd (ctx, fd);
 100
 101         close(fd);
 102
 103         return text;
 104 }
 105
 106 int
 107 main (int argc, char *argv[])
 108 {
 109         char *filename = NULL;
 110         void *ctx = talloc(NULL, void*);
 111         char *info_log = talloc_strdup(ctx, "");
 112         const char *shader;
 113         int ret;
 114
 115         if (argc) {
 116                 filename = argv[1];
 117         }
 118
 119         shader = load_text_file (ctx, filename);
 120         if (shader == NULL)
 121            return 1;
 122
 123         ret = preprocess(ctx, &shader, &info_log, NULL, API_OPENGL);
 124
 125         printf("%s", shader);
 126         fprintf(stderr, "%s", info_log);
 127
 128         talloc_free(ctx);
 129
 130         return ret;
 131 }