1 /* c-ctype.h: ASCII-safe versions of the <ctype.h> macros. 2 3 Copyright 1992, 1994, 2008, 2010, 2011 Karl Berry. 4 Copyright 1998, 2000, 2005 Olaf Weber. 5 6 This library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 This library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public License 17 along with this library; if not, see <http://www.gnu.org/licenses/>. */ 18 19 #ifndef KPATHSEA_C_CTYPE_H 20 #define KPATHSEA_C_CTYPE_H 21 22 #include <ctype.h> 23 24 /* Be sure we have `isascii', even if wrong. */ 25 #ifndef WIN32 26 #ifndef isascii 27 #define isascii(c) 1 28 #endif 29 #endif 30 31 #define ISALNUM(c) (isascii (c) && isalnum(c)) 32 #define ISALPHA(c) (isascii (c) && isalpha(c)) 33 #define ISASCII isascii 34 #define ISCNTRL(c) (isascii (c) && iscntrl(c)) 35 #define ISDIGIT(c) (isascii (c) && isdigit (c)) 36 #define ISGRAPH(c) (isascii (c) && isgraph(c)) 37 #define ISLOWER(c) (isascii (c) && islower(c)) 38 #define ISPRINT(c) (isascii (c) && isprint(c)) 39 #define ISPUNCT(c) (isascii (c) && ispunct(c)) 40 #define ISSPACE(c) (isascii (c) && isspace(c)) 41 #define ISUPPER(c) (isascii (c) && isupper(c)) 42 #define ISXDIGIT(c) (isascii (c) && isxdigit(c)) 43 #define TOASCII toascii 44 #define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c)) 45 #define TOUPPER(c) (ISLOWER (c) ? toupper (c) : (c)) 46 47 /* This isn't part of the usual <ctype.h>, but it's useful sometimes. */ 48 #ifndef isblank 49 #define isblank(c) ((c) == ' ' || (c) == '\t') 50 #endif 51 52 #define ISBLANK(c) (isascii (c) && isblank (c)) 53 54 55 /* Here's why this mess is necessary: 56 57 From: meyering@cs.utexas.edu (Jim Meyering) 58 Date: Wed, 25 Nov 1992 09:52:33 -0600 59 Subject: ss-921123: using isascii with <ctype.h> macros 60 61 Yesterday some cursory regression testing found that GNU od 62 (in an upcoming release of textutils) generated incorrect output 63 when run on an SGI indigo because isprint ('\377') returned true. 64 Of course, '\377' is not a printing character; the problem lay 65 in using isprint without first making sure its integer argument 66 corresponded to an ascii code. 67 68 MORAL: always guard uses of ctype macros with isascii if it's available. 69 An obvious alternative is to avoid <ctype.h> and define and use your 70 own versions of the ctype macros. 71 72 A pretty clean approach to using <ctype.h> and isascii was 73 suggested by David MacKenzie: 74 75 #ifndef isascii 76 #define isascii(c) 1 77 #endif 78 79 #define ISDIGIT(c) (isascii (c) && isdigit (c)) 80 #define ISPRINT(c) (isascii (c) && isprint (c)) 81 ... 82 83 then, use ISDIGIT, etc. instead of isdigit, etc. */ 84 85 #endif /* not KPATHSEA_C_CTYPE_H */ 86