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| author | Bruno Haible <bruno@clisp.org> | 2003-01-28 20:55:20 +0000 |
|---|---|---|
| committer | Bruno Haible <bruno@clisp.org> | 2003-01-28 20:55:20 +0000 |
| commit | a57f5d745451ad9028faf70a7df4e8f0407326b4 (patch) | |
| tree | 7e97ef0012a2dd061a2c680a0e6823a7e3c3253d /lib/c-ctype.h | |
| parent | f02c0a8f143140d93e855ed7ccd31779e707381d (diff) | |
| download | gnulib-a57f5d745451ad9028faf70a7df4e8f0407326b4.tar.gz | |
Optimization and comments.
Diffstat (limited to 'lib/c-ctype.h')
| -rw-r--r-- | lib/c-ctype.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/lib/c-ctype.h b/lib/c-ctype.h index 0f69e1071f..990997bee5 100644 --- a/lib/c-ctype.h +++ b/lib/c-ctype.h @@ -27,6 +27,14 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <stdbool.h> +/* The functions defined in this file assume the "C" locale and a character + set without diacritics (ASCII-US or EBCDIC-US or something like that). + Even if the "C" locale on a particular system is an extension of the ASCII + character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it + is ISO-8859-1), the functions in this file recognize only the ASCII + characters. */ + + /* Check whether the ASCII optimizations apply. */ /* ANSI C89 (and ISO C99 5.2.1.3 too) already guarantees that @@ -82,8 +90,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ && ('s' == 115) && ('t' == 116) && ('u' == 117) && ('v' == 118) \ && ('w' == 119) && ('x' == 120) && ('y' == 121) && ('z' == 122) \ && ('{' == 123) && ('|' == 124) && ('}' == 125) && ('~' == 126) -/* The character set is ISO646-US, not EBCDIC. - The test of '$' is important to distinguish it from other ISO646 variants. +/* The character set is ASCII or one of its variants or extensions, not EBCDIC. Testing the value of '\n' and '\r' is not relevant. */ #define C_CTYPE_ASCII 1 #endif @@ -116,7 +123,7 @@ extern int c_toupper (int c); #define c_isascii(c) \ ({ int __c = (c); \ - ((__c & ~0x7f) == 0); \ + (__c >= 0x00 && __c <= 0x7f); \ }) #if C_CTYPE_CONSECUTIVE_DIGITS \ |