import newlib-2000-02-17 snapshot

1 files changed, 142 insertions, 0 deletions

diff --git a/newlib/libc/posix/scandir.c b/newlib/libc/posix/scandir.c
new file mode 100644
index 000000000..895879bac
--- /dev/null
+++ b/newlib/libc/posix/scandir.c
@@ -0,0 +1,142 @@
+#ifndef HAVE_OPENDIR
+
+/*
+ * Copyright (c) 1983 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)scandir.c	5.10 (Berkeley) 2/23/91";
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Scan the directory dirname calling select to make a list of selected
+ * directory entries then sort using qsort and compare routine dcomp.
+ * Returns the number of entries and a pointer to a list of pointers to
+ * struct dirent (through namelist). Returns -1 if there were any errors.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <string.h>
+
+/*
+ * The DIRSIZ macro gives the minimum record length which will hold
+ * the directory entry.  This requires the amount of space in struct dirent
+ * without the d_name field, plus enough space for the name with a terminating
+ * null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
+ */
+#undef DIRSIZ
+#define DIRSIZ(dp) \
+    ((sizeof (struct dirent) - (MAXNAMLEN+1)) + (((dp)->d_namlen+1 + 3) &~ 3))
+
+#ifndef __P
+#define __P(args) ()
+#endif
+
+int
+scandir(dirname, namelist, select, dcomp)
+	const char *dirname;
+	struct dirent ***namelist;
+	int (*select) __P((struct dirent *));
+	int (*dcomp) __P((const void *, const void *));
+{
+	register struct dirent *d, *p, **names;
+	register size_t nitems;
+	struct stat stb;
+	long arraysz;
+	DIR *dirp;
+
+	if ((dirp = opendir(dirname)) == NULL)
+		return(-1);
+	if (fstat(dirp->dd_fd, &stb) < 0)
+		return(-1);
+
+	/*
+	 * estimate the array size by taking the size of the directory file
+	 * and dividing it by a multiple of the minimum size entry. 
+	 */
+	arraysz = (stb.st_size / 24);
+	names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
+	if (names == NULL)
+		return(-1);
+
+	nitems = 0;
+	while ((d = readdir(dirp)) != NULL) {
+		if (select != NULL && !(*select)(d))
+			continue;	/* just selected names */
+		/*
+		 * Make a minimum size copy of the data
+		 */
+		p = (struct dirent *)malloc(DIRSIZ(d));
+		if (p == NULL)
+			return(-1);
+		p->d_ino = d->d_ino;
+		p->d_reclen = d->d_reclen;
+		p->d_namlen = d->d_namlen;
+		bcopy(d->d_name, p->d_name, p->d_namlen + 1);
+		/*
+		 * Check to make sure the array has space left and
+		 * realloc the maximum size.
+		 */
+		if (++nitems >= arraysz) {
+			if (fstat(dirp->dd_fd, &stb) < 0)
+				return(-1);	/* just might have grown */
+			arraysz = stb.st_size / 12;
+			names = (struct dirent **)realloc((char *)names,
+				arraysz * sizeof(struct dirent *));
+			if (names == NULL)
+				return(-1);
+		}
+		names[nitems-1] = p;
+	}
+	closedir(dirp);
+	if (nitems && dcomp != NULL)
+		qsort(names, nitems, sizeof(struct dirent *), dcomp);
+	*namelist = names;
+	return(nitems);
+}
+
+/*
+ * Alphabetic order comparison routine for those who want it.
+ */
+int
+alphasort(d1, d2)
+	const void *d1;
+	const void *d2;
+{
+	return(strcmp((*(struct dirent **)d1)->d_name,
+	    (*(struct dirent **)d2)->d_name));
+}
+
+#endif /* ! HAVE_OPENDIR */