skunkworks-c/subprojects/lpng1639/contrib/mips-msa/linux.c

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2022-12-21 12:09:42 +01:00
/* contrib/mips-msa/linux.c
*
* Copyright (c) 2020 Cosmin Truta
* Copyright (c) 2016 Glenn Randers-Pehrson
* Written by Mandar Sahastrabuddhe, 2016.
*
* This code is released under the libpng license.
* For conditions of distribution and use, see the disclaimer
* and license in png.h
*
* SEE contrib/mips-msa/README before reporting bugs
*
* STATUS: SUPPORTED
* BUG REPORTS: png-mng-implement@sourceforge.net
*
* png_have_msa 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>
static int
png_have_msa(png_structp png_ptr)
{
FILE *f = fopen("/proc/cpuinfo", "rb");
char *string = "msa";
char word[10];
if (f != NULL)
{
while(!feof(f))
{
int ch = fgetc(f);
static int i = 0;
while(!(ch <= 32))
{
word[i++] = ch;
ch = fgetc(f);
}
int val = strcmp(string, word);
if (val == 0) {
fclose(f);
return 1;
}
i = 0;
memset(word, 0, 10);
}
fclose(f);
}
#ifdef PNG_WARNINGS_SUPPORTED
else
png_warning(png_ptr, "/proc/cpuinfo open failed");
#endif
return 0;
}