minix/lib/libc/sys-minix/getdents.c
Thomas Veerman c1a31d53d9 stat.h: remove some big_ types
Change-Id: I84017db3d54edfb823cc52e02d0b07fccb003988
2014-02-18 11:25:01 +01:00

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