1 files changed, 55 insertions, 0 deletions
diff --git a/newlib/libc/ctype/tolower.c b/newlib/libc/ctype/tolower.c
new file mode 100644
index 00000000000..e43fa6c9d1c
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+++ b/newlib/libc/ctype/tolower.c
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+/*
+FUNCTION
+	<<tolower>>---translate characters to lower case
+
+INDEX
+	tolower
+INDEX
+	_tolower
+
+ANSI_SYNOPSIS
+	#include <ctype.h>
+	int tolower(int <[c]>);
+	int _tolower(int <[c]>);
+
+TRAD_SYNOPSIS
+	#include <ctype.h>
+	int tolower(<[c]>);
+	int _tolower(<[c]>);
+
+
+DESCRIPTION
+<<tolower>> is a macro which converts upper-case characters to lower
+case, leaving all other characters unchanged.  It is only defined when
+<[c]> is an integer in the range <<EOF>> to <<255>>.
+
+You can use a compiled subroutine instead of the macro definition by
+undefining this macro using `<<#undef tolower>>'.
+
+<<_tolower>> performs the same conversion as <<tolower>>, but should
+only be used when <[c]> is known to be an uppercase character (<<A>>--<<Z>>).
+
+RETURNS
+<<tolower>> returns the lower-case equivalent of <[c]> when it is a
+character between <<A>> and <<Z>>, and <[c]> otherwise.
+
+<<_tolower>> returns the lower-case equivalent of <[c]> when it is a
+character between <<A>> and <<Z>>.  If <[c]> is not one of these
+characters, the behaviour of <<_tolower>> is undefined.
+
+PORTABILITY
+<<tolower>> is ANSI C.  <<_tolower>> is not recommended for portable
+programs.
+
+No supporting OS subroutines are required.
+*/ 
+
+#include <_ansi.h>
+#include <ctype.h>
+
+#undef tolower
+int
+_DEFUN(tolower,(c),int c)
+{
+	return isupper(c) ? (c) - 'A' + 'a' : c;
+}