1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Chris Torek. 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" $OpenBSD: string.3,v 1.11 2005/02/25 03:12:44 cloder Exp $ 31.\" 32.Dd April 19, 1991 33.Dt STRING 3 34.Os 35.Sh NAME 36.Nm string 37.Nd string specific functions 38.Sh SYNOPSIS 39.Fd #include <string.h> 40.Ft char * 41.Fn strcat "char *s" "const char *append" 42.Ft char * 43.Fn strlcat "char *s" "const char *append" "size_t size" 44.Ft char * 45.Fn strncat "char *s" "const char *append" "size_t count" 46.Ft char * 47.Fn strchr "const char *s" "int c" 48.Ft char * 49.Fn strrchr "const char *s" "int c" 50.Ft int 51.Fn strcmp "const char *s1" "const char *s2" 52.Ft int 53.Fn strncmp "const char *s1" "const char *s2" "size_t count" 54.Ft int 55.Fn strcasecmp "const char *s1" "const char *s2" 56.Ft int 57.Fn strncasecmp "const char *s1" "const char *s2" "size_t count" 58.Ft char * 59.Fn strcpy "char *dst" "const char *src" 60.Ft char * 61.Fn strlcpy "char *dst" "const char *src" "size_t size" 62.Ft char * 63.Fn strncpy "char *dst" "const char *src" "size_t count" 64.Ft char * 65.Fn strerror "int errno" 66.Ft size_t 67.Fn strlen "const char *s" 68.Ft char * 69.Fn strpbrk "const char *s" "const char *charset" 70.Ft char * 71.Fn strsep "char **stringp" "const char *delim" 72.Ft size_t 73.Fn strspn "const char *s" "const char *charset" 74.Ft size_t 75.Fn strcspn "const char *s" "const char *charset" 76.Ft char * 77.Fn strstr "const char *big" "const char *little" 78.Ft char * 79.Fn strtok "char *s" "const char *delim" 80.Ft char * 81.Fn index "const char *s" "int c" 82.Ft char * 83.Fn rindex "const char *s" "int c" 84.Sh DESCRIPTION 85The string functions 86manipulate strings terminated by a 87NUL byte. 88.Pp 89See the specific manual pages for more information. 90For manipulating variable length generic objects as byte 91strings (without the NUL-byte check), see 92.Xr bstring 3 . 93.Pp 94Except as noted in their specific manual pages, 95the string functions do not test the destination 96for size limitations. 97.Sh SEE ALSO 98.Xr bstring 3 , 99.Xr index 3 , 100.Xr rindex 3 , 101.Xr strcasecmp 3 , 102.Xr strcat 3 , 103.Xr strchr 3 , 104.Xr strcmp 3 , 105.Xr strcpy 3 , 106.Xr strcspn 3 , 107.Xr strerror 3 , 108.Xr strlcat 3 , 109.Xr strlcpy 3 , 110.Xr strlen 3 , 111.Xr strpbrk 3 , 112.Xr strrchr 3 , 113.Xr strsep 3 , 114.Xr strspn 3 , 115.Xr strstr 3 , 116.Xr strtok 3 117.Sh STANDARDS 118The 119.Fn strcat , 120.Fn strncat , 121.Fn strchr , 122.Fn strrchr , 123.Fn strcmp , 124.Fn strncmp , 125.Fn strcpy , 126.Fn strncpy , 127.Fn strerror , 128.Fn strlen , 129.Fn strpbrk , 130.Fn strspn , 131.Fn strcspn , 132.Fn strstr , 133and 134.Fn strtok 135functions conform to 136.St -ansiC . 137