diff options
Diffstat (limited to 'gnulib/lib/c-ctype.h')
| -rw-r--r-- | gnulib/lib/c-ctype.h | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/gnulib/lib/c-ctype.h b/gnulib/lib/c-ctype.h index 1bd76a0f0..2bce9d105 100644 --- a/gnulib/lib/c-ctype.h +++ b/gnulib/lib/c-ctype.h @@ -5,7 +5,7 @@ <ctype.h> functions' behaviour depends on the current locale set via setlocale. - Copyright (C) 2000-2003, 2006 Free Software Foundation, Inc. + Copyright (C) 2000-2003, 2006, 2008 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by @@ -103,6 +103,21 @@ extern "C" { /* Function declarations. */ +/* Unlike the functions in <ctype.h>, which require an argument in the range + of the 'unsigned char' type, the functions here operate on values that are + in the 'unsigned char' range or in the 'char' range. In other words, + when you have a 'char' value, you need to cast it before using it as + argument to a <ctype.h> function: + + const char *s = ...; + if (isalpha ((unsigned char) *s)) ... + + but you don't need to cast it for the functions defined in this file: + + const char *s = ...; + if (c_isalpha (*s)) ... + */ + extern bool c_isascii (int c); /* not locale dependent */ extern bool c_isalnum (int c); |