string: add GNU basename(3)

* libc/include/libgen.h (_BASENAME_DEFINED): Define.
* libc/include/string.h (basename): Declare.
* libc/string/Makefile.am (ELIX_4_SOURCES): Add gnu_basename.c.
* libc/string/Makefile.in: Regenerate.
* libc/string/gnu_basename.c: New file.

newlib/ChangeLog

@@ -1,3 +1,11 @@
+2015-03-30  Yaakov Selkowitz  <yselkowi@redhat.com>
+
+	* libc/include/libgen.h (_BASENAME_DEFINED): Define.
+	* libc/include/string.h (basename): Declare.
+	* libc/string/Makefile.am (ELIX_4_SOURCES): Add gnu_basename.c.
+	* libc/string/Makefile.in: Regenerate.
+	* libc/string/gnu_basename.c: New file.
+
 2015-03-23  Sebastian Huber  <sebastian.huber@embedded-brains.de>
 
 	* libc/include/sys/tree.h: New file.

newlib/libc/include/libgen.h

@@ -13,6 +13,7 @@ extern "C" {
 #endif
 
 char      *_EXFUN(basename,     (char *));
+#define _BASENAME_DEFINED
 char      *_EXFUN(dirname,     (char *));
 
 #ifdef __cplusplus

newlib/libc/include/string.h

@@ -163,6 +163,20 @@ int	_EXFUN(strtosigno, (const char *__name));
 			 (char *) memcpy (__out, __in, __len-1);}))
 #endif /* _GNU_SOURCE && __GNUC__ */
 
+/* There are two common basename variants.  If you #include <libgen.h>
+   first, you get the POSIX version; otherwise you get the GNU version.
+   POSIX requires that #undef basename will still let you
+   invoke the underlying function, but that requires gcc support.  */
+#if __GNU_VISIBLE && !defined(_BASENAME_DEFINED)
+# ifdef __GNUC__
+char	*_EXFUN(basename,(const char *))
+             __asm__ (__ASMNAME ("__gnu_basename")) __nonnull(1);
+# else
+char	*_EXFUN(__gnu_basename,(const char *));
+# define basename __gnu_basename
+# endif
+#endif
+
 #include <sys/string.h>
 
 _END_STD_C

newlib/libc/string/Makefile.am

@@ -102,6 +102,7 @@ if ELIX_LEVEL_3
 ELIX_4_SOURCES =
 else
 ELIX_4_SOURCES = \
+	gnu_basename.c \
 	memmem.c \
 	memrchr.c \
 	rawmemchr.c \

newlib/libc/string/Makefile.in

@@ -118,7 +118,8 @@ am__objects_1 = lib_a-bcopy.$(OBJEXT) lib_a-bzero.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@	lib_a-wcpcpy.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@	lib_a-wcpncpy.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@	lib_a-wcsdup.$(OBJEXT)
-@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_3 = lib_a-memmem.$(OBJEXT) \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_3 = lib_a-gnu_basename.$(OBJEXT) \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-memmem.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-memrchr.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-rawmemchr.$(OBJEXT) \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	lib_a-wcscasecmp.$(OBJEXT) \
@@ -145,7 +146,8 @@ am__objects_4 = bcopy.lo bzero.lo index.lo memchr.lo memcmp.lo \
 @ELIX_LEVEL_1_FALSE@	stpcpy.lo stpncpy.lo strndup.lo \
 @ELIX_LEVEL_1_FALSE@	strcasestr.lo strchrnul.lo strndup_r.lo \
 @ELIX_LEVEL_1_FALSE@	wcpcpy.lo wcpncpy.lo wcsdup.lo
-@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_6 = memmem.lo \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@am__objects_6 = gnu_basename.lo \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	memmem.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	memrchr.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	rawmemchr.lo \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	wcscasecmp.lo \
@@ -410,6 +412,7 @@ GENERAL_SOURCES = \
 
 @ELIX_LEVEL_1_TRUE@ELIX_2_SOURCES = 
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@ELIX_4_SOURCES = \
+@ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	gnu_basename.c \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	memmem.c \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	memrchr.c \
 @ELIX_LEVEL_1_FALSE@@ELIX_LEVEL_2_FALSE@@ELIX_LEVEL_3_FALSE@	rawmemchr.c \
@@ -998,6 +1001,12 @@ lib_a-wcsdup.o: wcsdup.c
 lib_a-wcsdup.obj: wcsdup.c
 	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-wcsdup.obj `if test -f 'wcsdup.c'; then $(CYGPATH_W) 'wcsdup.c'; else $(CYGPATH_W) '$(srcdir)/wcsdup.c'; fi`
 
+lib_a-gnu_basename.o: gnu_basename.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-gnu_basename.o `test -f 'gnu_basename.c' || echo '$(srcdir)/'`gnu_basename.c
+
+lib_a-gnu_basename.obj: gnu_basename.c
+	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-gnu_basename.obj `if test -f 'gnu_basename.c'; then $(CYGPATH_W) 'gnu_basename.c'; else $(CYGPATH_W) '$(srcdir)/gnu_basename.c'; fi`
+
 lib_a-memmem.o: memmem.c
 	$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(lib_a_CFLAGS) $(CFLAGS) -c -o lib_a-memmem.o `test -f 'memmem.c' || echo '$(srcdir)/'`memmem.c
 

newlib/libc/string/gnu_basename.c

@@ -0,0 +1,26 @@
+#ifndef _NO_BASENAME
+/* Copyright 2015 Red Hat, Inc.
+ * Permission to use, copy, modify, and distribute this software
+ * is freely granted, provided that this notice is preserved.
+ */
+
+/* The differences with the POSIX version (unix/basename.c):
+ * - declared in <string.h> (instead of <libgen.h>);
+ * - the argument is never modified, and therefore is marked const;
+ * - the empty string is returned if path is an empty string, "/", or ends
+ *   with a trailing slash.
+ */
+
+#include <string.h>
+
+char *
+_DEFUN (__gnu_basename, (path),
+	const char *path)
+{
+  char *p;
+  if ((p = strrchr (path, '/')))
+    return p + 1;
+  return path;
+}
+
+#endif /* !_NO_BASENAME  */