1 /* contrib/powerpc-vsx/linux.c 2 * 3 * Copyright (c) 2017 Glenn Randers-Pehrson 4 * Written by Vadim Barkov, 2017. 5 * Last changed in libpng 1.6.29 [March 16, 2017] 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 * STATUS: TESTED 12 * BUG REPORTS: png-mng-implement (at) sourceforge.net 13 * 14 * png_have_vsx implemented for Linux by reading the widely available 15 * pseudo-file /proc/cpuinfo. 16 * 17 * This code is strict ANSI-C and is probably moderately portable; it does 18 * however use <stdio.h> and it assumes that /proc/cpuinfo is never localized. 19 */ 20 21 #include <stdio.h> 22 #include <string.h> 23 #include <stdlib.h> 24 #include "png.h" 25 26 #ifndef MAXLINE 27 # define MAXLINE 1024 28 #endif 29 30 static int 31 png_have_vsx(png_structp png_ptr) 32 { 33 FILE *f; 34 35 const char *string = "altivec supported"; 36 char input[MAXLINE]; 37 char *token = NULL; 38 39 PNG_UNUSED(png_ptr) 40 41 f = fopen("/proc/cpuinfo", "r"); 42 if (f != NULL) 43 { 44 memset(input,0,MAXLINE); 45 while(fgets(input,MAXLINE,f) != NULL) 46 { 47 token = strstr(input,string); 48 if(token != NULL) 49 return 1; 50 } 51 } 52 #ifdef PNG_WARNINGS_SUPPORTED 53 else 54 png_warning(png_ptr, "/proc/cpuinfo open failed"); 55 #endif 56 return 0; 57 } 58
