2012-01-??  Yaakov Selkowitz  <yselkowitz@...>

	* libc/stdio/sprintf.c: Document 'm' conversion specifier.
	* libc/stdio/swprintf.c: Ditto.
	* libc/stdio/vfprintf.c (_VFPRINTF_R) [__CYGWIN__]: Handle 'm'
	conversion specifier.
	* libc/stdio/vfwprintf.c (_VFWPRINTF_R) [__CYGWIN__]: Ditto.

Index: libc/stdio/sprintf.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/stdio/sprintf.c,v
retrieving revision 1.14
diff -u -p -r1.14 sprintf.c
--- libc/stdio/sprintf.c	12 Mar 2009 10:27:10 -0000	1.14
+++ libc/stdio/sprintf.c	6 Jan 2012 06:27:49 -0000
@@ -518,6 +518,10 @@ DESCRIPTION
 			implementation is similar to <<%#tx>>), except
 			that <<0x>> appears even for the NULL pointer.
 
+		o m
+			Prints the output of <<strerror(errno)>>; no
+			argument is required.  A GNU extension.
+
 		o-
 	O-
 
Index: libc/stdio/swprintf.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/stdio/swprintf.c,v
retrieving revision 1.2
diff -u -p -r1.2 swprintf.c
--- libc/stdio/swprintf.c	12 Mar 2009 10:27:10 -0000	1.2
+++ libc/stdio/swprintf.c	6 Jan 2012 06:27:49 -0000
@@ -498,6 +498,10 @@ DESCRIPTION
 			implementation is similar to <<%#tx>>), except
 			that <<0x>> appears even for the NULL pointer.
 
+		o m
+			Prints the output of <<strerror(errno)>>; no
+			argument is required.  A GNU extension.
+
 		o-
 	O-
 
Index: libc/stdio/vfprintf.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/stdio/vfprintf.c,v
retrieving revision 1.79
diff -u -p -r1.79 vfprintf.c
--- libc/stdio/vfprintf.c	15 Feb 2010 16:10:28 -0000	1.79
+++ libc/stdio/vfprintf.c	6 Jan 2012 06:27:49 -0000
@@ -1225,6 +1225,15 @@ reswitch:	switch (ch) {
 				sign = '-';
 			break;
 #endif /* FLOATING_POINT */
+#if defined(__CYGWIN__)
+		case 'm':  /* extension */
+			{
+				int dummy;
+				cp = _strerror_r (data, data->_errno, 1, &dummy);
+			}
+			flags &= ~LONGINT;
+			goto string;
+#endif
 		case 'n':
 #ifndef _NO_LONGLONG
 			if (flags & QUADINT)
@@ -1272,8 +1281,11 @@ reswitch:	switch (ch) {
 #ifdef _WANT_IO_C99_FORMATS
 		case 'S':
 #endif
-			sign = '\0';
 			cp = GET_ARG (N, ap, char_ptr_t);
+#if defined(__CYGWIN__)
+string:
+#endif
+			sign = '\0';
 #ifndef __OPTIMIZE_SIZE__
 			/* Behavior is undefined if the user passed a
 			   NULL string when precision is not 0.
Index: libc/stdio/vfwprintf.c
===================================================================
RCS file: /cvs/src/src/newlib/libc/stdio/vfwprintf.c,v
retrieving revision 1.6
diff -u -p -r1.6 vfwprintf.c
--- libc/stdio/vfwprintf.c	15 Jul 2011 17:20:16 -0000	1.6
+++ libc/stdio/vfwprintf.c	6 Jan 2012 06:27:49 -0000
@@ -1074,6 +1074,15 @@ reswitch:	switch (ch) {
 				sign = L'-';
 			break;
 #endif /* FLOATING_POINT */
+#if defined(__CYGWIN__)
+		case L'm':  /* GNU extension */
+			{
+				int dummy;
+				cp = (wchar_t *) _strerror_r (data, data->_errno, 1, &dummy);
+			}
+			flags &= ~LONGINT;
+			goto string;
+#endif
 		case L'n':
 #ifndef _NO_LONGLONG
 			if (flags & QUADINT)
@@ -1118,8 +1127,11 @@ reswitch:	switch (ch) {
 #ifdef _WANT_IO_C99_FORMATS
 		case L'S':	/* POSIX extension */
 #endif
-			sign = '\0';
 			cp = GET_ARG (N, ap, wchar_ptr_t);
+#if defined(__CYGWIN__)
+string:
+#endif
+			sign = '\0';
 #ifndef __OPTIMIZE_SIZE__
 			/* Behavior is undefined if the user passed a
 			   NULL string when precision is not 0.
@@ -1132,7 +1144,7 @@ reswitch:	switch (ch) {
 			else
 #endif /* __OPTIMIZE_SIZE__ */
 #ifdef _MB_CAPABLE
-			if (ch == L's' && !(flags & LONGINT)) {
+			if (ch != L'S' && !(flags & LONGINT)) {
 				char *arg = (char *) cp;
 				size_t insize = 0, nchars = 0, nconv = 0;
 				mbstate_t ps;