archie/prospero/lib/pcompat/readdir.c
2024-05-27 16:13:40 +02:00

78 lines
2.3 KiB
C

/*
* Derived from Berkeley source code. Those parts are
* Copyright (c) 1983 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)readdir.c 5.7 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <pmachine.h>
#ifdef USE_SYS_DIR_H
#include <sys/dir.h>
#else
#include <dirent.h>
#endif
/*
* get next entry in a directory.
*/
struct dirent *
readdir(dirp)
register DIR *dirp;
{
register struct dirent *dp;
for (;;) {
if (dirp->dd_loc == 0) {
if(dirp->dd_fd >= 0)
#if defined(SUNOS)
dirp->dd_size = getdents(dirp->dd_fd,
dirp->dd_buf, dirp->dd_bsize);
#else
dirp->dd_size = getdirentries(dirp->dd_fd,
dirp->dd_buf, dirp->dd_bsize, &dirp->dd_bbase);
#endif
else
dirp->dd_size = p__getvdirentries(dirp->dd_fd,
dirp->dd_buf, dirp->dd_bsize, &dirp->dd_bbase);
if (dirp->dd_size <= 0)
return NULL;
}
if (dirp->dd_loc >= dirp->dd_size) {
dirp->dd_loc = 0;
continue;
}
dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
if ((int)dp & 03) /* bogus pointer check */
return NULL;
#if defined(SUNOS)
dirp->dd_bbase = dp->d_off;
#endif
if (dp->d_reclen <= 0 ||
dp->d_reclen > dirp->dd_bsize + 1 - dirp->dd_loc)
return NULL;
dirp->dd_loc += dp->d_reclen;
if (dp->d_ino == 0)
continue;
return (dp);
}
}