source/libs/libpng/libpng-src/contrib/mips-msa/linux.c

   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
  27 static int
  28 png_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 }