[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
new module 'c-strcasestr'
From: |
Bruno Haible |
Subject: |
new module 'c-strcasestr' |
Date: |
Mon, 10 Oct 2005 19:26:26 +0200 |
User-agent: |
KMail/1.5 |
Likewise, here is a module for case-insensitive string search. Also needed
by GNU gettext.
Objections? Comments?
============================= modules/c-strcasestr =============================
Description:
Case-insensitive searching in a string in C locale.
Files:
lib/c-strcasestr.h
lib/c-strcasestr.c
Depends-on:
c-ctype
configure.ac:
Makefile.am:
lib_SOURCES += c-strcasestr.h c-strcasestr.c
Include:
"c-strcasestr.h"
License:
LGPL
Maintainer:
Bruno Haible
============================= lib/c-strcasestr.h =============================
/* Case-insensitive searching in a string in C locale.
Copyright (C) 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_STRCASESTR_H
#define C_STRCASESTR_H
#ifdef __cplusplus
extern "C" {
#endif
/* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
comparison. */
extern char *c_strcasestr (const char *haystack, const char *needle);
#ifdef __cplusplus
}
#endif
#endif /* C_STRCASESTR_H */
============================= lib/c-strcasestr.c =============================
/* c-strcasestr.c -- case insensitive substring search in C locale
Copyright (C) 2005 Free Software Foundation, Inc.
Written by Bruno Haible <address@hidden>, 2005.
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-strcasestr.h"
#include <stddef.h>
#include "c-ctype.h"
/* Find the first occurrence of NEEDLE in HAYSTACK, using case-insensitive
comparison.
Note: This function may, in multibyte locales, return success even if
strlen (haystack) < strlen (needle) ! */
char *
c_strcasestr (const char *haystack, const char *needle)
{
/* Be careful not to look at the entire extent of haystack or needle
until needed. This is useful because of these two cases:
- haystack may be very long, and a match of needle found early,
- needle may be very long, and not even a short initial segment of
needle may be found in haystack. */
if (*needle != '\0')
{
/* Speed up the following searches of needle by caching its first
character. */
unsigned char b = c_tolower ((unsigned char) *needle);
needle++;
for (;; haystack++)
{
if (*haystack == '\0')
/* No match. */
return NULL;
if (c_tolower ((unsigned char) *haystack) == b)
/* The first character matches. */
{
const char *rhaystack = haystack + 1;
const char *rneedle = needle;
for (;; rhaystack++, rneedle++)
{
if (*rneedle == '\0')
/* Found a match. */
return (char *) haystack;
if (*rhaystack == '\0')
/* No match. */
return NULL;
if (c_tolower ((unsigned char) *rhaystack)
!= c_tolower ((unsigned char) *rneedle))
/* Nothing in this round. */
break;
}
}
}
}
else
return (char *) haystack;
}
===============================================================================
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- new module 'c-strcasestr',
Bruno Haible <=