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authorIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
committerIgor Pashev <pashev.igor@gmail.com>2012-06-24 22:28:35 +0000
commit3950ffe2a485479f6561c27364d3d7df5a21d124 (patch)
tree468c6e14449d1b1e279222ec32f676b0311917d2 /src/lib/libast/comp/dirname.c
downloadksh-upstream.tar.gz
Imported Upstream version 93u+upstream
Diffstat (limited to 'src/lib/libast/comp/dirname.c')
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diff --git a/src/lib/libast/comp/dirname.c b/src/lib/libast/comp/dirname.c
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+++ b/src/lib/libast/comp/dirname.c
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+/***********************************************************************
+* *
+* This software is part of the ast package *
+* Copyright (c) 1985-2011 AT&T Intellectual Property *
+* and is licensed under the *
+* Eclipse Public License, Version 1.0 *
+* by AT&T Intellectual Property *
+* *
+* A copy of the License is available at *
+* http://www.eclipse.org/org/documents/epl-v10.html *
+* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
+* *
+* Information and Software Systems Research *
+* AT&T Research *
+* Florham Park NJ *
+* *
+* Glenn Fowler <gsf@research.att.com> *
+* David Korn <dgk@research.att.com> *
+* Phong Vo <kpv@research.att.com> *
+* *
+***********************************************************************/
+#pragma prototyped
+/*
+ * dirname(3) implementation
+ */
+
+#include <ast_std.h>
+
+#if defined(__EXPORT__)
+#define extern __EXPORT__
+#endif
+
+extern char *dirname(register char *pathname)
+{
+ register char *last;
+ /* go to end of path */
+ for(last=pathname; *last; last++);
+ /* back over trailing '/' */
+ while(last>pathname && *--last=='/');
+ /* back over non-slash chars */
+ for(;last>pathname && *last!='/';last--);
+ if(last==pathname)
+ {
+ /* all '/' or "" */
+ if(*last!='/')
+ *last = '.';
+ /* preserve // */
+ else if(last[1]=='/')
+ last++;
+ }
+ else
+ {
+ /* back over trailing '/' */
+ for(;*last=='/' && last > pathname; last--);
+ /* preserve // */
+ if(last==pathname && *pathname=='/' && pathname[1]=='/')
+ last++;
+ }
+ *(last + 1) = 0;
+ return(pathname);
+}