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new module 'c-strcase'


From: Bruno Haible
Subject: new module 'c-strcase'
Date: Mon, 10 Oct 2005 19:26:12 +0200
User-agent: KMail/1.5

Hi,

While locale dependent string comparison and searching functions are
fine for many purposes, in some areas it is more important to have a locale
independent behaviour.

Here is a module for case-insensitive string comparison. Used in GNU gettext
for half a year.

Objections? Comments?


============================= modules/c-strcase =============================
Description:
Case-insensitive string comparison functions in C locale.

Files:
lib/c-strcase.h
lib/c-strcasecmp.c
lib/c-strncasecmp.c

Depends-on:
c-ctype

configure.ac:

Makefile.am:
lib_SOURCES += c-strcase.h c-strcasecmp.c c-strncasecmp.c

Include:
"c-strcase.h"

License:
LGPL

Maintainer:
Bruno Haible

=============================== lib/c-strcase.h ===============================
/* Case-insensitive string comparison functions in C locale.
   Copyright (C) 1995-1996, 2001, 2003, 2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef C_STRCASE_H
#define C_STRCASE_H

#include <stddef.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.  More precisely, one of the string arguments must be an ASCII
   string; the other one can also contain non-ASCII characters (but then
   the comparison result will be nonzero).  */


#ifdef __cplusplus
extern "C" {
#endif


/* Compare strings S1 and S2, ignoring case, returning less than, equal to or
   greater than zero if S1 is lexicographically less than, equal to or greater
   than S2.  */
extern int c_strcasecmp (const char *s1, const char *s2);

/* Compare no more than N characters of strings S1 and S2, ignoring case,
   returning less than, equal to or greater than zero if S1 is
   lexicographically less than, equal to or greater than S2.  */
extern int c_strncasecmp (const char *s1, const char *s2, size_t n);


#ifdef __cplusplus
}
#endif


#endif /* C_STRCASE_H */
============================= lib/c-strcasecmp.c =============================
/* c-strcasecmp.c -- case insensitive string comparator in C locale
   Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include "c-strcase.h"

#include "c-ctype.h"

int
c_strcasecmp (const char *s1, const char *s2)
{
  register const unsigned char *p1 = (const unsigned char *) s1;
  register const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;

  if (p1 == p2)
    return 0;

  do
    {
      c1 = c_tolower (*p1);
      c2 = c_tolower (*p2);

      if (c1 == '\0')
        break;

      ++p1;
      ++p2;
    }
  while (c1 == c2);

  return c1 - c2;
}
============================= lib/c-strncasecmp.c =============================
/* c-strncasecmp.c -- case insensitive string comparator in C locale
   Copyright (C) 1998, 1999, 2005 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

/* Specification.  */
#include "c-strcase.h"

#include "c-ctype.h"

int
c_strncasecmp (const char *s1, const char *s2, size_t n)
{
  register const unsigned char *p1 = (const unsigned char *) s1;
  register const unsigned char *p2 = (const unsigned char *) s2;
  unsigned char c1, c2;

  if (p1 == p2 || n == 0)
    return 0;

  do
    {
      c1 = c_tolower (*p1);
      c2 = c_tolower (*p2);

      if (--n == 0 || c1 == '\0')
        break;

      ++p1;
      ++p2;
    }
  while (c1 == c2);

  return c1 - c2;
}
===============================================================================





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