lib/replace/repdir_getdirentries.c

ソースコードを見る。

データ構造
struct	dir_buf
関数
DIR *	opendir (const char *dname)
dirent *	readdir (DIR *dir)
long	telldir (const DIR *dir) long telldir(DIR *dir)
int	seekdir (DIR *dir, long ofs) void seekdir(DIR *dir

---

関数

DIR* opendir

(

const char *

dname

)

repdir_getdirentries.c の 70 行で定義されています。

参照先 errno.

{
        struct dir_buf *d;
        struct stat sb;
        d = malloc(sizeof(*d));
        if (d == NULL) {
                errno = ENOMEM;
                return NULL;
        }
        d->fd = open(dname, O_RDONLY);
        if (d->fd == -1) {
                free(d);
                return NULL;
        }
        if (fstat(d->fd, &sb) < 0) {
                close(d->fd);
                free(d);
                return NULL;
        }
        if (!S_ISDIR(sb.st_mode)) {
                close(d->fd);
                free(d);   
                errno = ENOTDIR;
                return NULL;
        }
        d->ofs = 0;
        d->seekpos = 0;
        d->nbytes = 0;
        return (DIR *)d;
}

struct dirent* readdir

(

DIR *

dir

)

repdir_getdirentries.c の 101 行で定義されています。

参照先 dir_buf::buf・dir_buf::fd・dir_buf::nbytes・dir_buf::ofs・dir_buf::seekpos.

{
        struct dir_buf *d = (struct dir_buf *)dir;
        struct dirent *de;

        if (d->ofs >= d->nbytes) {
                long pos;
                d->nbytes = getdirentries(d->fd, d->buf, DIR_BUF_SIZE, &pos);
                d->seekpos = pos;
                d->ofs = 0;
        }
        if (d->ofs >= d->nbytes) {
                return NULL;
        }
        de = (struct dirent *)&d->buf[d->ofs];
        d->ofs += de->d_reclen;
        return de;
}

long telldir

(

const DIR *

dir

)

repdir_getdirentries.c の 121 行で定義されています。

参照先 dir_buf::fd・dir_buf::nbytes・dir_buf::ofs・dir_buf::seekpos.

{
        struct dir_buf *d = (struct dir_buf *)dir;
        if (d->ofs >= d->nbytes) {
                d->seekpos = lseek(d->fd, 0, SEEK_CUR);
                d->ofs = 0;
                d->nbytes = 0;
        }
        /* this relies on seekpos always being a multiple of
           DIR_BUF_SIZE. Is that always true on BSD systems? */
        if (d->seekpos & (DIR_BUF_SIZE-1)) {
                abort();
        }
        return d->seekpos + d->ofs;
}

int seekdir	(	DIR *	dir,
		long	ofs
	)

---