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