skunkworks-c/subprojects/lpng1639/contrib/powerpc-vsx/linux.c

57 lines
1.2 KiB
C

/* contrib/powerpc-vsx/linux.c
*
* Copyright (c) 2017 Glenn Randers-Pehrson
* Written by Vadim Barkov, 2017.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* STATUS: TESTED
* BUG REPORTS: png-mng-implement@sourceforge.net
*
* png_have_vsx implemented for Linux by reading the widely available
* pseudo-file /proc/cpuinfo.
*
* This code is strict ANSI-C and is probably moderately portable; it does
* however use <stdio.h> and it assumes that /proc/cpuinfo is never localized.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "png.h"
#ifndef MAXLINE
# define MAXLINE 1024
#endif
static int
png_have_vsx(png_structp png_ptr)
{
FILE *f;
const char *string = "altivec supported";
char input[MAXLINE];
char *token = NULL;
PNG_UNUSED(png_ptr)
f = fopen("/proc/cpuinfo", "r");
if (f != NULL)
{
memset(input,0,MAXLINE);
while(fgets(input,MAXLINE,f) != NULL)
{
token = strstr(input,string);
if(token != NULL)
return 1;
}
}
#ifdef PNG_WARNINGS_SUPPORTED
else
png_warning(png_ptr, "/proc/cpuinfo open failed");
#endif
return 0;
}