115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
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/*
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Copyright (C) 2009-2016 David Anderson. All Rights Reserved.
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Portions Copyright 2012 SN Systems Ltd. All rights reserved.
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This program is free software; you can redistribute it and/or modify it
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under the terms of version 2 of the GNU General Public License as
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published by the Free Software Foundation.
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This program is distributed in the hope that it would be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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Further, this software is distributed without any warranty that it is
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free of the rightful claim of any third person regarding infringement
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or the like. Any license provided herein, whether implied or
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otherwise, applies only to this software file. Patent licenses, if
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any, provided herein do not apply to combinations of this program with
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other software, or any other product whatsoever.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street - Fifth Floor, Boston MA 02110-1301, USA.
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*/
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/*
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This tries to find the string 'contained' in the
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string 'container'. it returns true if found, else false.
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The comparisons are independent of case.
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Regrettably there is no generally accepted version that
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does this job, though GNU Linux has strcasestr() which
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does what we need. Our code here do not behave like
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strstr or strcasestr in the case of
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an empty 'contained' argument: we return FALSE (this
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case is not interesting for dwarfdump).
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There is a public domain stristr(). But given that dwarfdump is GPL,
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it would seem (IANAL) that we cannot mix public domain code
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into the release.
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The software here is independently written and indeed trivial.
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The POSIX function tolower() is only properly defined on unsigned char, hence
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the ugly casts.
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strstrnocase.c
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*/
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#include <ctype.h>
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#include <stdio.h>
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#include <globals.h>
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boolean
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is_strstrnocase(const char * container, const char * contained)
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{
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const unsigned char *ct = (const unsigned char *)container;
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for (; *ct; ++ct )
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{
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const unsigned char * cntnd = (const unsigned char *)contained;
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for (; *cntnd && *ct ; ++cntnd,++ct)
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{
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unsigned char lct = tolower(*ct);
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unsigned char tlc = tolower(*cntnd);
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if (lct != tlc) {
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break;
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}
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}
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if (!*cntnd) {
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/* We matched all the way to end of contained */
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/* ASSERT: innerwrong = FALSE */
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return TRUE;
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}
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if (!*ct) {
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/* Ran out of container before contained,
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so no future match of contained
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is possible. */
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return FALSE;
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}
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/* No match so far.
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See if there is more in container to check. */
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}
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return FALSE;
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}
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#ifdef TEST
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static void
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test(const char *t1, const char *t2,int resexp)
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{
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boolean res = is_strstrnocase(t1,t2);
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if (res == resexp) {
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return;
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}
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printf("Error,mismatch %s and %s. Expected %d got %d\n",
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t1,t2,resexp,res);
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}
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int main()
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{
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test("aaaaa","a",1);
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test("aaaaa","b",0);
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test("abaaba","ba",1);
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test("abaaxa","x",1);
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test("abaabA","Ba",1);
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test("a","ab",0);
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test("b","c",0);
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test("b","",0);
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test("","c",0);
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test("","",0);
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test("aaaaa","aaaaaaaa",0);
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}
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#endif
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