87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
#include <sys/cdefs.h>
|
|
#include "namespace.h"
|
|
#include <lib.h>
|
|
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
static ssize_t __getdents321(int fd, char *buffer, size_t nbytes);
|
|
|
|
ssize_t getdents(int fd, char *buffer, size_t nbytes)
|
|
{
|
|
message m;
|
|
int r, orig_errno;
|
|
|
|
orig_errno = errno;
|
|
m.m1_i1 = fd;
|
|
m.m1_i2 = nbytes;
|
|
m.m1_p1 = (char *) buffer;
|
|
r = _syscall(VFS_PROC_NR, GETDENTS, &m);
|
|
if (r == -1 && errno == ENOSYS) {
|
|
errno = orig_errno;/* Restore old value so world is still as expected*/
|
|
r = __getdents321(fd, buffer, nbytes);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
ssize_t __getdents321(int fd, char *buffer, size_t nbytes)
|
|
{
|
|
message m;
|
|
int r, consumed = 0, newconsumed = 0;
|
|
char *intermediate = NULL;
|
|
struct dirent *dent;
|
|
struct dirent_321 *dent_321;
|
|
#define DWORD_ALIGN(d) if((d) % sizeof(long)) (d)+=sizeof(long)-(d)%sizeof(long)
|
|
|
|
intermediate = malloc(nbytes);
|
|
if (intermediate == NULL) return EINVAL;
|
|
|
|
m.m1_i1 = fd;
|
|
/* Pretend the buffer is smaller so we know the converted/expanded version
|
|
* will fit.
|
|
*/
|
|
nbytes = nbytes / 2;
|
|
if (nbytes < (sizeof(struct dirent) + NAME_MAX + 1)) {
|
|
free(intermediate);
|
|
return EINVAL; /* This might not fit. Sorry */
|
|
}
|
|
|
|
m.m1_i2 = nbytes;
|
|
m.m1_p1 = (char *) intermediate;
|
|
r = _syscall(VFS_PROC_NR, GETDENTS_321, &m);
|
|
|
|
if (r <= 0) {
|
|
free(intermediate);
|
|
return r;
|
|
}
|
|
|
|
/* Provided format is struct dirent_321 and has to be translated to
|
|
* struct dirent */
|
|
dent_321 = (struct dirent_321 *) intermediate;
|
|
dent = (struct dirent *) buffer;
|
|
|
|
while (consumed < r && dent_321->d_reclen > 0) {
|
|
dent->d_ino = (ino_t) dent_321->d_ino;
|
|
dent->d_off = (off_t) dent_321->d_off;
|
|
dent->d_reclen = offsetof(struct dirent, d_name) +
|
|
strlen(dent_321->d_name) + 1;
|
|
DWORD_ALIGN(dent->d_reclen);
|
|
strcpy(dent->d_name, dent_321->d_name);
|
|
consumed += dent_321->d_reclen;
|
|
newconsumed += dent->d_reclen;
|
|
dent_321 = (struct dirent_321 *) &intermediate[consumed];
|
|
dent = (struct dirent *) &buffer[newconsumed];
|
|
}
|
|
|
|
free(intermediate);
|
|
|
|
return newconsumed;
|
|
}
|
|
|
|
#if defined(__minix) && defined(__weak_alias)
|
|
__weak_alias(getdents, __getdents30)
|
|
#endif
|