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Fix the freaddir implementation for the stand-alone interpreter.

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Bug pointed out by: Jan Beich <jbeich@tormail.org>
This commit is contained in:
Marcel Moolenaar 2013-08-09 19:10:56 +00:00
parent 65ba8dff5f
commit d6c0f33b57
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254155
1 changed files with 39 additions and 11 deletions
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50
sys/boot/ficl/loader.c
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@ -518,12 +518,12 @@ static void pfread(FICL_VM *pVM)
static void pfreaddir(FICL_VM *pVM)
{
#ifdef TESTMAIN
static union {
struct dirent dirent;
char buf[512];
} u;
off_t off;
int len;
static struct dirent dirent;
struct stat sb;
char *buf;
off_t off, ptr;
u_int blksz;
int bufsz;
#endif
struct dirent *d;
int fd;
@ -539,11 +539,39 @@ static void pfreaddir(FICL_VM *pVM)
* We do the best we can to make freaddir work, but it's not at
* all guaranteed.
*/
off = lseek(fd, 0LL, SEEK_CUR);
len = getdents(fd, u.buf, sizeof(u.buf));
d = (len != -1) ? &u.dirent : NULL;
if (d != NULL)
lseek(fd, off + d->d_reclen, SEEK_SET);
d = NULL;
buf = NULL;
do {
if (fd == -1)
break;
if (fstat(fd, &sb) == -1)
break;
blksz = (sb.st_blksize) ? sb.st_blksize : getpagesize();
if ((blksz & (blksz - 1)) != 0)
break;
buf = malloc(blksz);
if (buf == NULL)
break;
off = lseek(fd, 0LL, SEEK_CUR);
if (off == -1)
break;
ptr = off;
if (lseek(fd, 0, SEEK_SET) == -1)
break;
bufsz = getdents(fd, buf, blksz);
while (bufsz > 0 && bufsz <= ptr) {
ptr -= bufsz;
bufsz = getdents(fd, buf, blksz);
}
if (bufsz <= 0)
break;
d = (void *)(buf + ptr);
dirent = *d;
off += d->d_reclen;
d = (lseek(fd, off, SEEK_SET) != off) ? NULL : &dirent;
} while (0);
if (buf != NULL)
free(buf);
#else
d = readdirfd(fd);
#endif