The Tor Browser: nsprpub/lib/libc/src/strstr.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #include "plstr.h"

     7 #include <string.h>

     9 PR_IMPLEMENT(char *)

    10 PL_strstr(const char *big, const char *little)

    11 {

    12     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;

    13     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;

    15     return strstr(big, little);

    16 }

    18 PR_IMPLEMENT(char *)

    19 PL_strrstr(const char *big, const char *little)

    20 {

    21     const char *p;

    22     size_t ll;

    23     size_t bl;

    25     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;

    26     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;

    28     ll = strlen(little);

    29     bl = strlen(big);

    30     if( bl < ll ) return (char *)0;

    31     p = &big[ bl - ll ];

    33     for( ; p >= big; p-- )

    34         if( *little == *p )

    35             if( 0 == strncmp(p, little, ll) )

    36                 return (char *)p;

    38     return (char *)0;

    39 }

    41 PR_IMPLEMENT(char *)

    42 PL_strnstr(const char *big, const char *little, PRUint32 max)

    43 {

    44     size_t ll;

    46     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;

    47     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;

    49     ll = strlen(little);

    50     if( ll > (size_t)max ) return (char *)0;

    51     max -= (PRUint32)ll;

    52     max++;

    54     for( ; max && *big; big++, max-- )

    55         if( *little == *big )

    56             if( 0 == strncmp(big, little, ll) )

    57                 return (char *)big;

    59     return (char *)0;

    60 }

    62 PR_IMPLEMENT(char *)

    63 PL_strnrstr(const char *big, const char *little, PRUint32 max)

    64 {

    65     const char *p;

    66     size_t ll;

    68     if( ((const char *)0 == big) || ((const char *)0 == little) ) return (char *)0;

    69     if( ((char)0 == *big) || ((char)0 == *little) ) return (char *)0;

    71     ll = strlen(little);

    73     for( p = big; max && *p; p++, max-- )

    74         ;

    76     p -= ll;

    77     if( p < big ) return (char *)0;

    79     for( ; p >= big; p-- )

    80         if( *little == *p )

    81             if( 0 == strncmp(p, little, ll) )

    82                 return (char *)p;

    84     return (char *)0;

    85 }

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