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Add new strnstr() function
Taken from FreeBSD.
This commit is contained in:
Guillem Jover
parent
ff0d700df0
commit
1be0bdb2c9
4
COPYING
4
COPYING
@ -97,6 +97,7 @@ The rest of the licenses apply to code and/or man pages.
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Copyright © 1980, 1982, 1986, 1989-1994
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The Regents of the University of California. All rights reserved.
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Copyright © 2001 Mike Barcroft <mike@FreeBSD.org>
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Some code is derived from software contributed to Berkeley by
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the American National Standards Committee X3, on Information
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@ -114,6 +115,9 @@ The rest of the licenses apply to code and/or man pages.
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Some code is derived from software contributed to Berkeley by
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Paul Vixie.
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Some code is derived from software contributed to Berkeley by
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Chris Torek.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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@ -39,6 +39,7 @@
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__BEGIN_DECLS
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size_t strlcpy(char *dst, const char *src, size_t siz);
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size_t strlcat(char *dst, const char *src, size_t siz);
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char *strnstr(const char *str, const char *find, size_t str_len);
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void strmode(mode_t mode, char *str);
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__END_DECLS
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@ -45,6 +45,7 @@ dist_man_MANS = \
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sradixsort.3 \
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strlcat.3 \
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strlcpy.3 \
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strnstr.3 \
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strmode.3 \
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strtonum.3 \
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tree.3 \
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110
man/strnstr.3
Normal file
110
man/strnstr.3
Normal file
@ -0,0 +1,110 @@
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.\" Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Chris Torek and the American National Standards Committee X3,
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.\" on Information Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)strstr.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd October 11, 2001
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.Dt STRSTR 3
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.Os
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.Sh NAME
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.Nm strnstr
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.Nd locate a substring in a string
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.Sh LIBRARY
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.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
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.Lb libbsd
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.Sh SYNOPSIS
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.In bsd/string.h
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.Ft char *
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.Fn strnstr "const char *big" "const char *little" "size_t len"
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.Sh DESCRIPTION
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The
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.Fn strnstr
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function
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locates the first occurrence of the null-terminated string
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.Fa little
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in the string
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.Fa big ,
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where not more than
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.Fa len
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characters are searched.
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Characters that appear after a
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.Ql \e0
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character are not searched.
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Since the
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.Fn strnstr
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function is a
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.Fx
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specific API, it should only be used when portability is not a concern.
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.Sh RETURN VALUES
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If
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.Fa little
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is an empty string,
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.Fa big
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is returned;
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if
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.Fa little
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occurs nowhere in
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.Fa big ,
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.Dv NULL
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is returned;
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otherwise a pointer to the first character of the first occurrence of
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.Fa little
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is returned.
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.Sh EXAMPLES
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The following sets the pointer
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.Va ptr
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to
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.Dv NULL ,
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because only the first 4 characters of
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.Va largestring
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are searched:
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.Bd -literal -offset indent
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const char *largestring = "Foo Bar Baz";
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const char *smallstring = "Bar";
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char *ptr;
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ptr = strnstr(largestring, smallstring, 4);
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.Ed
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.Sh SEE ALSO
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.Xr strstr 3 ,
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.Xr strcasestr 3 ,
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.Xr memchr 3 ,
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.Xr memmem 3 ,
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.Xr strchr 3 ,
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.Xr strcspn 3 ,
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.Xr strpbrk 3 ,
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.Xr strrchr 3 ,
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.Xr strsep 3 ,
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.Xr strspn 3 ,
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.Xr strtok 3 ,
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.Xr wcsstr 3
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@ -65,6 +65,7 @@ libbsd_la_SOURCES = \
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strlcat.c \
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strlcpy.c \
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strmode.c \
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strnstr.c \
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strtonum.c \
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unvis.c \
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vis.c \
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@ -96,6 +96,8 @@ LIBBSD_0.4 {
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} LIBBSD_0.3;
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LIBBSD_0.5 {
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strnstr;
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wcslcat;
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wcslcpy;
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} LIBBSD_0.4;
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65
src/strnstr.c
Normal file
65
src/strnstr.c
Normal file
@ -0,0 +1,65 @@
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/*-
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* Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)strstr.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <string.h>
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/*
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* Find the first occurrence of find in s, where the search is limited to the
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* first slen characters of s.
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*/
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char *
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strnstr(const char *s, const char *find, size_t slen)
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{
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char c, sc;
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size_t len;
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if ((c = *find++) != '\0') {
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len = strlen(find);
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do {
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do {
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if (slen-- < 1 || (sc = *s++) == '\0')
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return (NULL);
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} while (sc != c);
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if (len > slen)
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return (NULL);
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} while (strncmp(s, find, len) != 0);
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s--;
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}
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return ((char *)s);
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}
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