lib/c-strcase.h

   1 /* Case-insensitive string comparison functions in C locale.
   2    Copyright (C) 1995-1996, 2001, 2003, 2005, 2009-2024 Free Software
   3    Foundation, Inc.
   4
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9
  10    This file is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #ifndef C_STRCASE_H
  19 #define C_STRCASE_H
  20
  21 /* This file uses _GL_ATTRIBUTE_PURE.  */
  22 #if !_GL_CONFIG_H_INCLUDED
  23  #error "Please include config.h first."
  24 #endif
  25
  26 #include <stddef.h>
  27
  28
  29 /* The functions defined in this file assume the "C" locale and a character
  30    set without diacritics (ASCII-US or EBCDIC-US or something like that).
  31    Even if the "C" locale on a particular system is an extension of the ASCII
  32    character set (like on BeOS, where it is UTF-8, or on AmigaOS, where it
  33    is ISO-8859-1), the functions in this file recognize only the ASCII
  34    characters.  More precisely, one of the string arguments must be an ASCII
  35    string; the other one can also contain non-ASCII characters (but then
  36    the comparison result will be nonzero).  */
  37
  38
  39 #ifdef __cplusplus
  40 extern "C" {
  41 #endif
  42
  43
  44 /* Compare strings S1 and S2, ignoring case, returning less than, equal to or
  45    greater than zero if S1 is lexicographically less than, equal to or greater
  46    than S2.  */
  47 extern int c_strcasecmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
  48
  49 /* Compare no more than N characters of strings S1 and S2, ignoring case,
  50    returning less than, equal to or greater than zero if S1 is
  51    lexicographically less than, equal to or greater than S2.  */
  52 extern int c_strncasecmp (const char *s1, const char *s2, size_t n)
  53   _GL_ATTRIBUTE_PURE;
  54
  55
  56 #ifdef __cplusplus
  57 }
  58 #endif
  59
  60
  61 #endif /* C_STRCASE_H */