58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
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/* contrib/powerpc-vsx/linux.c
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*
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* Copyright (c) 2016 Glenn Randers-Pehrson
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* Written by Vadim Barkov, 2017.
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*
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* SEE contrib/powerpc-vsx/README before reporting bugs
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*
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* STATUS: COMPILED
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* BUG REPORTS: png-mng-implement@sourceforge.net
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*
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* png_have_vsx implemented for Linux by reading the widely available
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* pseudo-file /proc/cpuinfo. Result is cached so if function will be called
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* multiple times only one reading is perfomed.
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*
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* This code is strict ANSI-C and is probably moderately portable; it does
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* however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "png.h"
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#ifndef MAXLINE
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# define MAXLINE 1024
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#endif
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static int
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png_have_vsx(png_structp png_ptr)
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{
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FILE *f;
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const char *string = "altivec supported";
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char input[MAXLINE];
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char *token = NULL;
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f = fopen("/proc/cpuinfo", "r");
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if (f != NULL)
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{
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memset(input,0,MAXLINE);
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while(fgets(input,MAXLINE,f) != NULL)
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{
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token = strstr(input,string);
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if(token != NULL)
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return cachedResult;
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}
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}
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#ifdef PNG_WARNINGS_SUPPORTED
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else
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png_warning(png_ptr, "/proc/cpuinfo open failed");
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#endif
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return cachedResult;
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}
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