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