The Tor Browser: nsprpub/lib/libc/src/strchr.c@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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_strchr(const char *s, char c)

    11 {

    12     if( (const char *)0 == s ) return (char *)0;

    14     return strchr(s, c);

    15 }

    17 PR_IMPLEMENT(char *)

    18 PL_strrchr(const char *s, char c)

    19 {

    20     if( (const char *)0 == s ) return (char *)0;

    22     return strrchr(s, c);

    23 }

    25 PR_IMPLEMENT(char *)

    26 PL_strnchr(const char *s, char c, PRUint32 n)

    27 {

    28     if( (const char *)0 == s ) return (char *)0;

    30     for( ; n && *s; s++, n-- )

    31         if( *s == c )

    32             return (char *)s;

    34     if( ((char)0 == c) && (n > 0) && ((char)0 == *s) ) return (char *)s;

    36     return (char *)0;

    37 }

    39 PR_IMPLEMENT(char *)

    40 PL_strnrchr(const char *s, char c, PRUint32 n)

    41 {

    42     const char *p;

    44     if( (const char *)0 == s ) return (char *)0;

    46     for( p = s; n && *p; p++, n-- )

    47         ;

    49     if( ((char)0 == c) && (n > 0) && ((char)0 == *p) ) return (char *)p;

    51     for( p--; p >= s; p-- )

    52         if( *p == c )

    53             return (char *)p;

    55     return (char *)0;

    56 }

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