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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/ape/lib/ap/plan9/opendir.c – Rev 2

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#include "lib.h"
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#include <stdlib.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 <errno.h>
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#include <string.h>
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#include "sys9.h"
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#include "dir.h"
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#define DBLOCKSIZE 20
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DIR *
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opendir(const char *filename)
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{
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	int f;
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	DIR *d;
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	struct stat sb;
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	Dir *d9;
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	if((d9 = _dirstat(filename)) == nil){
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		_syserrno();
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		return NULL;
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	}
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	_dirtostat(&sb, d9, 0);
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	free(d9);
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	if(S_ISDIR(sb.st_mode) == 0) {
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		errno = ENOTDIR;
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		return NULL;
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	}
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	f = open(filename, O_RDONLY);
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	if(f < 0){
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		_syserrno();
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		return NULL;
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	}
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	_fdinfo[f].flags |= FD_CLOEXEC;
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	d = (DIR *)malloc(sizeof(DIR) + DBLOCKSIZE*sizeof(struct dirent));
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	if(!d){
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		errno = ENOMEM;
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		return NULL;
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	}
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	d->dd_buf = (char *)d + sizeof(DIR);
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	d->dd_fd = f;
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	d->dd_loc = 0;
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	d->dd_size = 0;
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	d->dirs = nil;
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	d->dirsize = 0;
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	d->dirloc = 0;
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	return d;
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}
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int
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closedir(DIR *d)
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{
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	if(!d){
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		errno = EBADF;
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		return -1;
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	}
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	if(close(d->dd_fd) < 0)
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		return -1;
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	free(d->dirs);
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	free(d);
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	return 0;
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}
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void
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rewinddir(DIR *d)
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{
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	if(!d)
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		return;
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	d->dd_loc = 0;
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	d->dd_size = 0;
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	d->dirsize = 0;
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	d->dirloc = 0;
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	free(d->dirs);
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	d->dirs = nil;
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	if(_SEEK(d->dd_fd, 0, 0) < 0){
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		_syserrno();
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		return;
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	}
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}
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struct dirent *
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readdir(DIR *d)
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{
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	int i;
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	struct dirent *dr;
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	Dir *dirs;
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	if(!d){
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		errno = EBADF;
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		return NULL;
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	}
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	if(d->dd_loc >= d->dd_size){
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		if(d->dirloc >= d->dirsize){
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			free(d->dirs);
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			d->dirs = NULL;
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			d->dirsize = _dirread(d->dd_fd, &d->dirs);
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			d->dirloc = 0;
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		}
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		if(d->dirsize < 0) {	/* malloc or read failed in _dirread? */
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			free(d->dirs);
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			d->dirs = NULL;
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		}
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		if(d->dirs == NULL)
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			return NULL;
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		dr = (struct dirent *)d->dd_buf;
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		dirs = d->dirs;
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		for(i=0; i<DBLOCKSIZE && d->dirloc < d->dirsize; i++){
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			strncpy(dr[i].d_name, dirs[d->dirloc++].name, MAXNAMLEN);
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			dr[i].d_name[MAXNAMLEN] = 0;
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		}
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		d->dd_loc = 0;
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		d->dd_size = i*sizeof(struct dirent);
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	}
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	dr = (struct dirent*)(d->dd_buf+d->dd_loc);
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	d->dd_loc += sizeof(struct dirent);
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	return dr;
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}