X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrrchr.c;h=89c4ebf25e4aaacd879b1180aa94ce8de8f2db8c;hb=12e17136786afb1775c9dc946cbe41f5e230c24a;hp=4f1e2b5cb58fbd230de5b04776d5050f62cc14f0;hpb=c8f799d852e3698468a78954d82588e841cc0b70;p=pdclib.old diff --git a/functions/string/strrchr.c b/functions/string/strrchr.c index 4f1e2b5..89c4ebf 100644 --- a/functions/string/strrchr.c +++ b/functions/string/strrchr.c @@ -1,26 +1,43 @@ -/* ---------------------------------------------------------------------------- - * $Id$ - * ---------------------------------------------------------------------------- - * Public Domain C Library - http://pdclib.sourceforge.net - * This code is Public Domain. Use, modify, and redistribute at will. - * --------------------------------------------------------------------------*/ +/* $Id$ */ -#include <__NULL.h> +/* Release $Name$ */ -char * strrchr( const char * src, int c ) +/* strrchr( const char *, int c ) + + This file is part of the Public Domain C Library (PDCLib). + Permission is granted to use, modify, and / or redistribute at will. +*/ + +#include + +#ifndef REGTEST + +char * strrchr( const char * s, int c ) { - const char * p = src; - while ( *p != '\0' ) - { - ++p; - } - while ( p >= src ) + size_t i = 0; + while ( s[i++] ); + do { - if ( *p == (char) c ) + if ( s[--i] == (char) c ) { - return (char *) p; + return (char *) s + i; } - --p; - } + } while ( i ); return NULL; } + +#endif + +#ifdef TEST +#include <_PDCLIB_test.h> + +int main( void ) +{ + char abccd[] = "abccd"; + TESTCASE( strrchr( abcde, '\0' ) == &abcde[5] ); + TESTCASE( strrchr( abcde, 'e' ) == &abcde[4] ); + TESTCASE( strrchr( abcde, 'a' ) == &abcde[0] ); + TESTCASE( strrchr( abccd, 'c' ) == &abccd[3] ); + return TEST_RESULTS; +} +#endif