- /*
- * opendir.c --
- *
- * This file provides dirent-style directory-reading procedures
- * for V7 Unix systems that don't have such procedures. The
- * origin of this code is unclear, but it seems to have come
- * originally from Larry Wall.
- *
- *
- * RCS: @(#) $Id: opendir.c,v 1.2 1998/09/14 18:39:44 stanton Exp $
- */
- #include "tclInt.h"
- #include "tclPort.h"
- #undef DIRSIZ
- #define DIRSIZ(dp)
- ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
- /*
- * open a directory.
- */
- DIR *
- opendir(name)
- char *name;
- {
- register DIR *dirp;
- register int fd;
- char *myname;
- myname = ((*name == ' ') ? "." : name);
- if ((fd = open(myname, 0, 0)) == -1)
- return NULL;
- if ((dirp = (DIR *)ckalloc(sizeof(DIR))) == NULL) {
- close (fd);
- return NULL;
- }
- dirp->dd_fd = fd;
- dirp->dd_loc = 0;
- return dirp;
- }
- /*
- * read an old style directory entry and present it as a new one
- */
- #ifndef pyr
- #define ODIRSIZ 14
- struct olddirect {
- ino_t od_ino;
- char od_name[ODIRSIZ];
- };
- #else /* a Pyramid in the ATT universe */
- #define ODIRSIZ 248
- struct olddirect {
- long od_ino;
- short od_fill1, od_fill2;
- char od_name[ODIRSIZ];
- };
- #endif
- /*
- * get next entry in a directory.
- */
- struct dirent *
- readdir(dirp)
- register DIR *dirp;
- {
- register struct olddirect *dp;
- static struct dirent dir;
- for (;;) {
- if (dirp->dd_loc == 0) {
- dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf,
- DIRBLKSIZ);
- if (dirp->dd_size <= 0)
- return NULL;
- }
- if (dirp->dd_loc >= dirp->dd_size) {
- dirp->dd_loc = 0;
- continue;
- }
- dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc);
- dirp->dd_loc += sizeof(struct olddirect);
- if (dp->od_ino == 0)
- continue;
- dir.d_ino = dp->od_ino;
- strncpy(dir.d_name, dp->od_name, ODIRSIZ);
- dir.d_name[ODIRSIZ] = ' '; /* insure null termination */
- dir.d_namlen = strlen(dir.d_name);
- dir.d_reclen = DIRSIZ(&dir);
- return (&dir);
- }
- }
- /*
- * close a directory.
- */
- void
- closedir(dirp)
- register DIR *dirp;
- {
- close(dirp->dd_fd);
- dirp->dd_fd = -1;
- dirp->dd_loc = 0;
- ckfree((char *) dirp);
- }