ref: 4a120a381652668b7eb9313d9b8ca1835ddccb91
dir: /sys/src/libc/9sys/dirread.c/
#include <u.h> #include <libc.h> #include <fcall.h> static long dirpackage(uchar *buf, long ts, Dir **d) { char *s; long i, n, nn, m; /* * first find number of all stats, check they look like stats, & size all associated strings */ n = 0; for(i = 0; i < ts; i += m){ if(i+BIT16SZ >= ts) return -1; m = BIT16SZ + GBIT16(&buf[i]); if(i+m > ts || statcheck(&buf[i], m) < 0) return -1; n++; } *d = malloc(n * sizeof(Dir) + ts); if(*d == nil) return -1; /* * then convert all buffers */ s = (char*)*d + n * sizeof(Dir); nn = 0; for(i = 0; i < ts; i += m){ m = BIT16SZ + GBIT16(&buf[i]); if(i+m > ts || nn >= n || convM2D(&buf[i], m, *d + nn, s) != m){ free(*d); *d = nil; return -1; } nn++; s += m; } return nn; } long dirread(int fd, Dir **d) { uchar *buf; long ts; *d = nil; buf = malloc(DIRMAX); if(buf == nil) return -1; ts = read(fd, buf, DIRMAX); if(ts > 0) ts = dirpackage(buf, ts, d); free(buf); return ts; } long dirreadall(int fd, Dir **d) { uchar *buf, *nbuf; long n, ts; *d = nil; buf = nil; ts = 0; for(;;){ nbuf = realloc(buf, ts+DIRMAX); if(nbuf == nil){ free(buf); return -1; } buf = nbuf; n = read(fd, buf+ts, DIRMAX); if(n <= 0) break; ts += n; } if(ts > 0) ts = dirpackage(buf, ts, d); free(buf); if(ts == 0 && n < 0) return -1; return ts; }