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nsprpub/lib/libc/src/strstr.c@44a2da4a2ab2 (annotated)

nsprpub/lib/libc/src/strstr.c

Fri, 16 Jan 2015 04:50:19 +0100

author

Michael Schloh von Bennewitz <michael@schloh.com>

date

Fri, 16 Jan 2015 04:50:19 +0100

branch

TOR_BUG_9701

changeset 13

44a2da4a2ab2

permissions

-rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

michael@0	1	/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0	2	/* This Source Code Form is subject to the terms of the Mozilla Public
michael@0	3	* License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0	4	* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0	5
michael@0	6	#include "plstr.h"
michael@0	7	#include <string.h>
michael@0	8
michael@0	9	PR_IMPLEMENT(char *)
michael@0	10	PL_strstr(const char *big, const char *little)
michael@0	11	{
michael@0	12	if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
michael@0	13	if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
michael@0	14
michael@0	15	return strstr(big, little);
michael@0	16	}
michael@0	17
michael@0	18	PR_IMPLEMENT(char *)
michael@0	19	PL_strrstr(const char *big, const char *little)
michael@0	20	{
michael@0	21	const char *p;
michael@0	22	size_t ll;
michael@0	23	size_t bl;
michael@0	24
michael@0	25	if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
michael@0	26	if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
michael@0	27
michael@0	28	ll = strlen(little);
michael@0	29	bl = strlen(big);
michael@0	30	if( bl < ll ) return (char *)0;
michael@0	31	p = &big[ bl - ll ];
michael@0	32
michael@0	33	for( ; p >= big; p-- )
michael@0	34	if( *little == *p )
michael@0	35	if( 0 == strncmp(p, little, ll) )
michael@0	36	return (char *)p;
michael@0	37
michael@0	38	return (char *)0;
michael@0	39	}
michael@0	40
michael@0	41	PR_IMPLEMENT(char *)
michael@0	42	PL_strnstr(const char *big, const char *little, PRUint32 max)
michael@0	43	{
michael@0	44	size_t ll;
michael@0	45
michael@0	46	if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
michael@0	47	if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
michael@0	48
michael@0	49	ll = strlen(little);
michael@0	50	if( ll > (size_t)max ) return (char *)0;
michael@0	51	max -= (PRUint32)ll;
michael@0	52	max++;
michael@0	53
michael@0	54	for( ; max && *big; big++, max-- )
michael@0	55	if( *little == *big )
michael@0	56	if( 0 == strncmp(big, little, ll) )
michael@0	57	return (char *)big;
michael@0	58
michael@0	59	return (char *)0;
michael@0	60	}
michael@0	61
michael@0	62	PR_IMPLEMENT(char *)
michael@0	63	PL_strnrstr(const char *big, const char *little, PRUint32 max)
michael@0	64	{
michael@0	65	const char *p;
michael@0	66	size_t ll;
michael@0	67
michael@0	68	if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;
michael@0	69	if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;
michael@0	70
michael@0	71	ll = strlen(little);
michael@0	72
michael@0	73	for( p = big; max && *p; p++, max-- )
michael@0	74	;
michael@0	75
michael@0	76	p -= ll;
michael@0	77	if( p < big ) return (char *)0;
michael@0	78
michael@0	79	for( ; p >= big; p-- )
michael@0	80	if( *little == *p )
michael@0	81	if( 0 == strncmp(p, little, ll) )
michael@0	82	return (char *)p;
michael@0	83
michael@0	84	return (char *)0;
michael@0	85	}