ref: 1ccd0cd04d75840861e26f6c5f6ac73396d43d8a
dir: /sys/src/ape/lib/ap/plan9/dirstat.c/
#include "lib.h" #include <string.h> #include <stdlib.h> #include "sys9.h" #include "dir.h" enum { DIRSIZE = STATFIXLEN + 16 * 4 /* enough for encoded stat buf + some reasonable strings */ }; Dir* _dirstat(char *name) { Dir *d; uchar *buf; int n, nd, i; nd = DIRSIZE; for(i=0; i<2; i++){ /* should work by the second try */ d = malloc(sizeof(Dir) + BIT16SZ +nd); if(d == nil) return nil; buf = (uchar*)&d[1]; n = _STAT(name, buf, BIT16SZ+nd); if(n < BIT16SZ){ free(d); return nil; } nd = GBIT16((uchar*)buf); /* size needed to store whole stat buffer */ if(nd <= n){ _convM2D(buf, n, d, (char*)&d[1]); return d; } /* else sizeof(Dir)+BIT16SZ+nd is plenty */ free(d); } return nil; } int _dirwstat(char *name, Dir *d) { uchar *buf; int r; r = _sizeD2M(d); buf = malloc(r); if(buf == nil) return -1; _convD2M(d, buf, r); r = _WSTAT(name, buf, r); free(buf); return r; } Dir* _dirfstat(int fd) { Dir *d; uchar *buf; int n, nd, i; nd = DIRSIZE; for(i=0; i<2; i++){ /* should work by the second try */ d = malloc(sizeof(Dir) + nd); if(d == nil) return nil; buf = (uchar*)&d[1]; n = _FSTAT(fd, buf, nd); if(n < BIT16SZ){ free(d); return nil; } nd = GBIT16(buf); /* size needed to store whole stat buffer */ if(nd <= n){ _convM2D(buf, n, d, (char*)&d[1]); return d; } /* else sizeof(Dir)+nd is plenty */ free(d); } return nil; } int _dirfwstat(int fd, Dir *d) { uchar *buf; int r; r = _sizeD2M(d); buf = malloc(r); if(buf == nil) return -1; _convD2M(d, buf, r); r = _FWSTAT(fd, buf, r); free(buf); return r; } void _nulldir(Dir *d) { memset(d, ~0, sizeof(Dir)); d->name = d->uid = d->gid = d->muid = ""; }