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1 /* c-ctype.h: ASCII-safe versions of the <ctype.h> macros. |
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2 |
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3 Copyright (C) 1992 Free Software Foundation, Inc. |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Library General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Library General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Library General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
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18 |
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19 #ifndef KPATHSEA_C_CTYPE_H |
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20 #define KPATHSEA_C_CTYPE_H |
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21 |
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22 #include <ctype.h> |
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23 |
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24 /* Be sure we have `isascii'. */ |
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25 #ifndef isascii |
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26 #define isascii(c) 1 |
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27 #endif |
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28 |
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29 #define ISALNUM(c) (isascii (c) && isalnum(c)) |
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30 #define ISALPHA(c) (isascii (c) && isalpha(c)) |
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31 #define ISASCII isascii |
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32 #define ISCNTRL(c) (isascii (c) && iscntrl(c)) |
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33 #define ISDIGIT(c) (isascii (c) && isdigit (c)) |
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34 #define ISGRAPH(c) (isascii (c) && isgraph(c)) |
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35 #define ISLOWER(c) (isascii (c) && islower(c)) |
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36 #define ISPRINT(c) (isascii (c) && isprint(c)) |
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37 #define ISPUNCT(c) (isascii (c) && ispunct(c)) |
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38 #define ISSPACE(c) (isascii (c) && isspace(c)) |
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39 #define ISUPPER(c) (isascii (c) && isupper(c)) |
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40 #define ISXDIGIT(c) (isascii (c) && isxdigit(c)) |
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41 #define TOASCII toascii |
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42 #define TOLOWER(c) (ISUPPER (c) ? tolower (c) : (c)) |
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43 #define TOUPPER(c) (ISLOWER (c) ? toupper (c) : (c)) |
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44 |
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45 /* This isn't part of the usual <ctype.h>, but it's useful sometimes. */ |
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46 #ifndef isblank |
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47 #define isblank(c) ((c) == ' ' || (c) == '\t') |
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48 #endif |
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49 |
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50 |
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51 /* Here's why this mess is necessary: |
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52 |
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53 From: meyering@cs.utexas.edu (Jim Meyering) |
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54 Date: Wed, 25 Nov 1992 09:52:33 -0600 |
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55 Subject: ss-921123: using isascii with <ctype.h> macros |
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56 |
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57 Yesterday some cursory regression testing found that GNU od |
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58 (in an upcoming release of textutils) generated incorrect output |
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59 when run on an SGI indigo because isprint ('\377') returned true. |
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60 Of course, '\377' is not a printing character; the problem lay |
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61 in using isprint without first making sure its integer argument |
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62 corresponded to an ascii code. |
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63 |
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64 MORAL: always guard uses of ctype macros with isascii if it's available. |
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65 An obvious alternative is to avoid <ctype.h> and define and use your |
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66 own versions of the ctype macros. |
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67 |
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68 A pretty clean approach to using <ctype.h> and isascii was |
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69 suggested by David MacKenzie: |
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70 |
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71 #ifndef isascii |
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72 #define isascii(c) 1 |
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73 #endif |
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74 |
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75 #define ISDIGIT(c) (isascii (c) && isdigit (c)) |
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76 #define ISPRINT(c) (isascii (c) && isprint (c)) |
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77 ... |
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78 |
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79 then, use ISDIGIT, etc. instead of isdigit, etc. */ |
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80 |
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81 #endif /* not KPATHSEA_C_CTYPE_H */ |
