diff --git a/library/GNUmakefile.68k b/library/GNUmakefile.68k
index b1eb9a9..b5bb3cb 100644
--- a/library/GNUmakefile.68k
+++ b/library/GNUmakefile.68k
@@ -1,5 +1,5 @@
 #
-# $Id: GNUmakefile.68k,v 1.52 2005-05-08 08:51:29 obarthel Exp $
+# $Id: GNUmakefile.68k,v 1.53 2005-05-11 20:15:24 obarthel Exp $
 #
 # :ts=8
 #
@@ -127,6 +127,7 @@ C_LIB = \
 	ctype_isalnum.o \
 	ctype_isalpha.o \
 	ctype_isascii.o \
+	ctype_isblank.o \
 	ctype_iscntrl.o \
 	ctype_isdigit.o \
 	ctype_isgraph.o \
diff --git a/library/GNUmakefile.os4 b/library/GNUmakefile.os4
index aa7aeec..c68b4aa 100644
--- a/library/GNUmakefile.os4
+++ b/library/GNUmakefile.os4
@@ -1,5 +1,5 @@
 #
-# $Id: GNUmakefile.os4,v 1.55 2005-05-08 08:51:29 obarthel Exp $
+# $Id: GNUmakefile.os4,v 1.56 2005-05-11 20:15:25 obarthel Exp $
 #
 # :ts=8
 #
@@ -125,6 +125,7 @@ C_LIB = \
 	ctype_isalnum.o \
 	ctype_isalpha.o \
 	ctype_isascii.o \
+	ctype_isblank.o \
 	ctype_iscntrl.o \
 	ctype_isdigit.o \
 	ctype_isgraph.o \
diff --git a/library/changes b/library/changes
index a5f714c..34b74d3 100644
--- a/library/changes
+++ b/library/changes
@@ -60,6 +60,8 @@
 
 - mktime() now handles one leap second gracefully.
 
+- Added isblank().
+
 
 c.lib 1.191 (9.4.2005)
 
diff --git a/library/ctype_isblank.c b/library/ctype_isblank.c
new file mode 100644
index 0000000..f445631
--- /dev/null
+++ b/library/ctype_isblank.c
@@ -0,0 +1,52 @@
+/*
+ * $Id: ctype_isblank.c,v 1.1 2005-05-11 20:15:25 obarthel Exp $
+ *
+ * :ts=4
+ *
+ * Portable ISO 'C' (1994) runtime library for the Amiga computer
+ * Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *   - Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *   - Neither the name of Olaf Barthel nor the names of contributors
+ *     may be used to endorse or promote products derived from this
+ *     software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifndef _CTYPE_HEADERS_H
+#include "ctype_headers.h"
+#endif /* _CTYPE_HEADERS_H */
+
+/****************************************************************************/
+
+#undef isspace
+
+/****************************************************************************/
+
+int
+isblank(int c)
+{
+	int result;
+
+	result = (c == '\t' || c == ' ');
+
+	return(result);
+}
diff --git a/library/include/ctype.h b/library/include/ctype.h
index 8fd6589..163f44e 100644
--- a/library/include/ctype.h
+++ b/library/include/ctype.h
@@ -1,5 +1,5 @@
 /*
- * $Id: ctype.h,v 1.5 2005-01-09 15:20:33 obarthel Exp $
+ * $Id: ctype.h,v 1.6 2005-05-11 20:15:28 obarthel Exp $
  *
  * :ts=4
  *
@@ -57,6 +57,7 @@ extern int islower(int c);
 extern int isupper(int c);
 
 extern int isspace(int c);
+extern int isblank(int c);
 
 extern int tolower(int c);
 extern int toupper(int c);
@@ -99,6 +100,7 @@ extern const unsigned char __ctype_table[];
 #define islower(c)	((__ctype_table[(c) & 255] & __CTYPE_LOWER_CASE) != 0)
 #define isupper(c)	((__ctype_table[(c) & 255] & __CTYPE_UPPER_CASE) != 0)
 #define isspace(c)	((__ctype_table[(c) & 255] & __CTYPE_WHITE_SPACE) != 0)
+#define isblank(c)	((c) == ' ' || (c) == '\t')
 
 /****************************************************************************/
 
diff --git a/library/include/stdio.h b/library/include/stdio.h
index 0f6d0f8..87b9ca4 100644
--- a/library/include/stdio.h
+++ b/library/include/stdio.h
@@ -1,5 +1,5 @@
 /*
- * $Id: stdio.h,v 1.13 2005-05-08 17:02:16 obarthel Exp $
+ * $Id: stdio.h,v 1.14 2005-05-11 20:15:28 obarthel Exp $
  *
  * :ts=4
  *
@@ -377,7 +377,6 @@ extern int putchar_unlocked(int c);
 extern FILE * fdopen(int file_descriptor, const char * type);
 extern int fileno(FILE * file);
 extern int asprintf(char **ret, const char *format, ...);
-extern int snprintf(char *s,size_t size,const char *format,...);
 extern int vsnprintf(char *s,size_t size,const char *format,va_list arg);
 extern int pclose(FILE *stream);
 extern FILE * popen(const char *command, const char *type);
@@ -426,6 +425,7 @@ extern int __vasprintf(const char *file,int line,char **ret,const char *format,v
 extern int vfscanf(FILE *stream, const char *format, va_list arg);
 extern int vsscanf(const char *s, const char *format, va_list arg);
 extern int vscanf(const char *format,va_list arg);
+extern int snprintf(char *s,size_t size,const char *format,...);
 
 /****************************************************************************/
 
diff --git a/library/smakefile b/library/smakefile
index 7150dad..225c713 100644
--- a/library/smakefile
+++ b/library/smakefile
@@ -1,5 +1,5 @@
 #
-# $Id: smakefile,v 1.40 2005-05-08 08:51:29 obarthel Exp $
+# $Id: smakefile,v 1.41 2005-05-11 20:15:25 obarthel Exp $
 #
 # :ts=8
 #
@@ -104,6 +104,7 @@ CTYPE_OBJ = \
 	ctype_isalnum.o \
 	ctype_isalpha.o \
 	ctype_isascii.o \
+	ctype_isblank.o \
 	ctype_iscntrl.o \
 	ctype_isdigit.o \
 	ctype_isgraph.o \