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Diffstat (limited to 'Build/source/texk/kpathsea/c-ctype.h')
-rw-r--r-- | Build/source/texk/kpathsea/c-ctype.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/c-ctype.h b/Build/source/texk/kpathsea/c-ctype.h new file mode 100644 index 00000000000..5e453e08fbb --- /dev/null +++ b/Build/source/texk/kpathsea/c-ctype.h @@ -0,0 +1,85 @@ +/* c-ctype.h: ASCII-safe versions of the <ctype.h> macros. + + Copyright 1992, 1994, 2008, 2010, 2011, 2015 Karl Berry. + Copyright 1998, 2000, 2005 Olaf Weber. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this library; if not, see <http://www.gnu.org/licenses/>. */ + +#ifndef KPATHSEA_C_CTYPE_H +#define KPATHSEA_C_CTYPE_H + +#include <ctype.h> + +/* Be sure we have `isascii'. */ +#ifndef WIN32 +#if !(defined(HAVE_DECL_ISASCII) && HAVE_DECL_ISASCII) +#define isascii(c) (((c) & ~0x7f) == 0) +#endif +#endif + +#define ISALNUM(c) (isascii (c) && isalnum((unsigned char)c)) +#define ISALPHA(c) (isascii (c) && isalpha((unsigned char)c)) +#define ISASCII isascii +#define ISCNTRL(c) (isascii (c) && iscntrl((unsigned char)c)) +#define ISDIGIT(c) (isascii (c) && isdigit ((unsigned char)c)) +#define ISGRAPH(c) (isascii (c) && isgraph((unsigned char)c)) +#define ISLOWER(c) (isascii (c) && islower((unsigned char)c)) +#define ISPRINT(c) (isascii (c) && isprint((unsigned char)c)) +#define ISPUNCT(c) (isascii (c) && ispunct((unsigned char)c)) +#define ISSPACE(c) (isascii (c) && isspace((unsigned char)c)) +#define ISUPPER(c) (isascii (c) && isupper((unsigned char)c)) +#define ISXDIGIT(c) (isascii (c) && isxdigit((unsigned char)c)) +#define TOASCII toascii +#define TOLOWER(c) (ISUPPER (c) ? tolower ((unsigned char)c) : (c)) +#define TOUPPER(c) (ISLOWER (c) ? toupper ((unsigned char)c) : (c)) + +/* This isn't part of the usual <ctype.h>, but it's useful sometimes. */ +#ifndef isblank +#define isblank(c) ((c) == ' ' || (c) == '\t') +#endif + +#define ISBLANK(c) (isascii (c) && isblank ((unsigned char)c)) + + +/* Here's why this mess is necessary: + +From: meyering@cs.utexas.edu (Jim Meyering) +Date: Wed, 25 Nov 1992 09:52:33 -0600 +Subject: ss-921123: using isascii with <ctype.h> macros + + Yesterday some cursory regression testing found that GNU od + (in an upcoming release of textutils) generated incorrect output + when run on an SGI indigo because isprint ('\377') returned true. + Of course, '\377' is not a printing character; the problem lay + in using isprint without first making sure its integer argument + corresponded to an ascii code. + + MORAL: always guard uses of ctype macros with isascii if it's available. + An obvious alternative is to avoid <ctype.h> and define and use your + own versions of the ctype macros. + + A pretty clean approach to using <ctype.h> and isascii was + suggested by David MacKenzie: + + #ifndef isascii + #define isascii(c) 1 + #endif + + #define ISDIGIT(c) (isascii (c) && isdigit (c)) + #define ISPRINT(c) (isascii (c) && isprint (c)) + ... + + then, use ISDIGIT, etc. instead of isdigit, etc. */ + +#endif /* not KPATHSEA_C_CTYPE_H */ |