Import Tcl 8.5.15 (as of svn r89086)

compat/opendir.c

@@ -0,0 +1,110 @@
+/* 
+ * 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.
+ */
+
+#include "tclInt.h"
+
+#undef DIRSIZ
+#define DIRSIZ(dp) \
+    ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
+
+/*
+ * open a directory.
+ */
+
+DIR *
+opendir(
+    char *name)
+{
+    register DIR *dirp;
+    register int fd;
+    char *myname;
+
+    myname = ((*name == '\0') ? "." : name);
+    if ((fd = open(myname, 0, 0)) == -1) {
+	return NULL;
+    }
+    dirp = (DIR *) ckalloc(sizeof(DIR));
+    if (dirp == NULL) {
+	/* unreachable? */
+	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(
+    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] = '\0'; /* insure null termination */
+	dir.d_namlen = strlen(dir.d_name);
+	dir.d_reclen = DIRSIZ(&dir);
+	return &dir;
+    }
+}
+
+/*
+ * close a directory.
+ */
+
+void
+closedir(
+    register DIR *dirp)
+{
+    close(dirp->dd_fd);
+    dirp->dd_fd = -1;
+    dirp->dd_loc = 0;
+    ckfree((char *) dirp);
+}