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 (at) 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 } 65
