60 lines
1.4 KiB
C
Executable file
60 lines
1.4 KiB
C
Executable file
/* readdir() Author: Kees J. Bot
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* 24 Apr 1989
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*/
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#define nil 0
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#include <lib.h>
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#define read _read
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#define readdir _readdir
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <errno.h>
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#include <string.h>
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#define v7ent(p) ((struct _v7_direct *) (p))
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#define V7_EXTENT (sizeof(struct _v7_direct) / sizeof(struct _fl_direct) - 1)
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struct dirent *readdir(DIR *dp)
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/* Return the next entry in a directory. Handle V7 and FLEX format dirs. */
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{
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struct dirent *e;
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if (dp == nil) { errno= EBADF; return nil; }
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do {
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if (dp->_count <= 0) {
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/* Read the next directory block. */
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dp->_count= read(dp->_fd, dp->_buf, sizeof(dp->_buf));
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if (dp->_count <= 0) return nil;
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dp->_count/= sizeof(dp->_buf[0]);
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dp->_ptr= dp->_buf;
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/* Extent is zero of the first flex entry. */
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if (dp->_v7 == (char)-1) dp->_v7= dp->_buf[0].d_extent;
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}
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if (!dp->_v7) {
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/* FLEX. */
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e= (struct dirent *) dp->_ptr;
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} else {
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/* V7: transform to FLEX. */
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e= (struct dirent *) dp->_v7f;
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e->d_ino= v7ent(dp->_ptr)->d_ino;
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e->d_extent= V7_EXTENT;
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memcpy(e->d_name, v7ent(dp->_ptr)->d_name, DIRSIZ);
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e->d_name[DIRSIZ]= 0;
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}
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dp->_ptr+= 1 + e->d_extent;
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dp->_count-= 1 + e->d_extent;
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dp->_pos+= (1 + e->d_extent) * sizeof(*dp->_ptr);
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} while (e->d_ino == 0);
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return e;
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}
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