1/* contrib/mips-msa/linux.c
 2 *
 3 * Copyright (c) 2016 Glenn Randers-Pehrson
 4 * Written by Mandar Sahastrabuddhe, 2016.
 5 * Last changed in libpng 1.6.25beta03 [August 29, 2016]
 6 *
 7 * This code is released under the libpng license.
 8 * For conditions of distribution and use, see the disclaimer
 9 * and license in png.h
10 *
11 * SEE contrib/mips-msa/README before reporting bugs
12 *
13 * STATUS: SUPPORTED
14 * BUG REPORTS: png-mng-implement@sourceforge.net
15 *
16 * png_have_msa implemented for Linux by reading the widely available
17 * pseudo-file /proc/cpuinfo.
18 *
19 * This code is strict ANSI-C and is probably moderately portable; it does
20 * however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
21 */
22
23#include <stdio.h>
24#include <string.h>
25#include <stdlib.h>
26
27static int
28png_have_msa(png_structp png_ptr)
29{
30   FILE *f = fopen("/proc/cpuinfo", "rb");
31
32   char *string = "msa";
33   char word[10];
34
35   if (f != NULL)
36   {
37      while(!feof(f))
38      {
39         int ch = fgetc(f);
40         static int i = 0;
41
42         while(!(ch <= 32))
43         {
44            word[i++] = ch;
45            ch = fgetc(f);
46         }
47
48         int val = strcmp(string, word);
49
50         if (val == 0)
51            return 1;
52
53         i = 0;
54         memset(word, 0, 10);
55      }
56
57      fclose(f);
58   }
59#ifdef PNG_WARNINGS_SUPPORTED
60   else
61      png_warning(png_ptr, "/proc/cpuinfo open failed");
62#endif
63   return 0;
64}