Imported Upstream version 60upstream/60

1 files changed, 55 insertions, 0 deletions

diff --git a/src/lib9/getwd.c b/src/lib9/getwd.c
new file mode 100644
index 000000000..3c8cafb3a
--- /dev/null
+++ b/src/lib9/getwd.c
@@ -0,0 +1,55 @@
+/*
+Plan 9 from User Space src/lib9/getwd.c
+http://code.swtch.com/plan9port/src/tip/src/lib9/getwd.c
+
+Copyright 2001-2007 Russ Cox.  All Rights Reserved.
+Portions Copyright 2011 The Go Authors.  All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+#include <u.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <libc.h>
+
+#undef getwd
+
+char*
+p9getwd(char *s, int ns)
+{
+	char *pwd;
+	struct stat st1, st2;
+
+	// Clumsy but widespread kludge:
+	// if $PWD is set and matches ".", use it.
+	// Matches glibc's get_current_dir_name and Go's os.Getwd.
+	pwd = getenv("PWD");  // note: getenv, not p9getenv, so no free
+	if(pwd != nil && pwd[0] &&
+			stat(pwd, &st1) >= 0 && stat(".", &st2) >= 0 &&
+			st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) {
+		if(strlen(pwd) >= ns) {
+			errno = ERANGE;
+			return nil;
+		}
+		strcpy(s, pwd);
+		return s;
+	}
+
+	return getcwd(s, ns);
+}