1 #include <u.h> 2 #include <libc.h> 3 #include <fcall.h> 4 5 enum 6 { 7 DIRSIZE = STATFIXLEN + 16 * 4 /* enough for encoded stat buf + some reasonable strings */ 8 }; 9 10 Dir* dirstat(char * name)11dirstat(char *name) 12 { 13 Dir *d; 14 uchar *buf; 15 int n, nd, i; 16 17 nd = DIRSIZE; 18 for(i=0; i<2; i++){ /* should work by the second try */ 19 d = malloc(sizeof(Dir) + BIT16SZ + nd); 20 if(d == nil) 21 return nil; 22 buf = (uchar*)&d[1]; 23 n = stat(name, buf, BIT16SZ+nd); 24 if(n < BIT16SZ){ 25 free(d); 26 return nil; 27 } 28 nd = GBIT16((uchar*)buf); /* upper bound on size of Dir + strings */ 29 if(nd <= n){ 30 convM2D(buf, n, d, (char*)&d[1]); 31 return d; 32 } 33 /* else sizeof(Dir)+BIT16SZ+nd is plenty */ 34 free(d); 35 } 36 return nil; 37 } 38