1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. 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.\" from: @(#)string.3 8.2 (Berkeley) 12/11/93 31.\" $NetBSD: string.3,v 1.17 2016/07/14 18:36:57 abhinav Exp $ 32.\" 33.Dd May 1, 2009 34.Dt STRING 3 35.Os 36.Sh NAME 37.Nm stpcpy , 38.Nm stpncpy , 39.Nm strcat , 40.Nm strlcat , 41.Nm strncat , 42.Nm strchr , 43.Nm strrchr , 44.Nm strcmp , 45.Nm strncmp , 46.Nm strcasecmp , 47.Nm strncasecmp , 48.Nm strcoll , 49.Nm strcpy , 50.Nm strlcpy , 51.Nm strncpy , 52.Nm strerror , 53.Nm strerror_r , 54.Nm strlen , 55.Nm strnlen , 56.Nm strpbrk , 57.Nm strsep , 58.Nm stresep , 59.Nm strspn , 60.Nm strcspn , 61.Nm strdup , 62.Nm strndup , 63.Nm strstr , 64.Nm strcasestr , 65.Nm strtok , 66.Nm strtok_r , 67.Nm strxfrm 68.Nd string specific functions 69.Sh LIBRARY 70.Lb libc 71.Sh SYNOPSIS 72.In string.h 73.Ft char * 74.Fn stpcpy "char *dst" "const char *src" 75.Ft char * 76.Fn stpncpy "char *dst" "const char *src" "size_t count" 77.Ft char * 78.Fn strcat "char *s" "const char * append" 79.Ft size_t 80.Fn strlcat "char *dst" "const char *src" "size_t size" 81.Ft char * 82.Fn strncat "char *s" "const char *append" "size_t count" 83.Ft char * 84.Fn strchr "const char *s" "int c" 85.Ft char * 86.Fn strrchr "const char *s" "int c" 87.Ft int 88.Fn strcmp "const char *s1" "const char *s2" 89.Ft int 90.Fn strncmp "const char *s1" "const char *s2" "size_t count" 91.Ft int 92.Fn strcasecmp "const char *s1" "const char *s2" 93.Ft int 94.Fn strncasecmp "const char *s1" "const char *s2" "size_t count" 95.Ft int 96.Fn strcoll "const char *s1" "const char *s2" 97.Ft char * 98.Fn strcpy "char *dst" "const char *src" 99.Ft size_t 100.Fn strlcpy "char *dst" "const char *src" "size_t size" 101.Ft char * 102.Fn strncpy "char *dst" "const char *src" "size_t count" 103.Ft char * 104.Fn strerror "int errno" 105.Ft int 106.Fn strerror_r "int errnum" "char *strerrbuf" "size_t buflen" 107.Ft size_t 108.Fn strlen "const char *s" 109.Ft size_t 110.Fn strnlen "const char *s" "size_t count" 111.Ft char * 112.Fn strpbrk "const char *s" "const char *charset" 113.Ft char * 114.Fn strsep "char **stringp" "const char *delim" 115.Ft char * 116.Fn stresep "char **stringp" "const char *delim" "int escape" 117.Ft size_t 118.Fn strspn "const char *s" "const char *charset" 119.Ft size_t 120.Fn strcspn "const char *s" "const char *charset" 121.Ft char * 122.Fn strdup "const char *str" 123.Ft char * 124.Fn strndup "const char *str" "size_t len" 125.Ft char * 126.Fn strstr "const char *big" "const char *little" 127.Ft char * 128.Fn strcasestr "const char *big" "const char *little" 129.Ft char * 130.Fn strtok "char *s" "const char *delim" 131.Ft char * 132.Fn strtok_r "char *s" "const char *delim" "char **lasts" 133.Ft size_t 134.Fn strxfrm "char *dst" "const char *src" "size_t n" 135.Sh DESCRIPTION 136The string 137functions manipulate strings terminated by a 138nul byte. 139.Pp 140See the specific manual pages for more information. 141For manipulating variable length generic objects as byte 142strings (without the nul byte check), see 143.Xr bstring 3 . 144.Pp 145Except as noted in their specific manual pages, 146the string functions do not test the destination 147for size limitations. 148.Sh SEE ALSO 149.Xr bstring 3 , 150.Xr strcat 3 , 151.Xr strchr 3 , 152.Xr strcmp 3 , 153.Xr strcoll 3 , 154.Xr strcpy 3 , 155.Xr strcspn 3 , 156.Xr strdup 3 , 157.Xr strerror 3 , 158.Xr strings 3 , 159.Xr strlcat 3 , 160.Xr strlen 3 , 161.Xr strpbrk 3 , 162.Xr strrchr 3 , 163.Xr strsep 3 , 164.Xr strspn 3 , 165.Xr strstr 3 , 166.Xr strtok 3 , 167.Xr strxfrm 3 168.Sh STANDARDS 169The 170.Fn strcat , 171.Fn strncat , 172.Fn strchr , 173.Fn strrchr , 174.Fn strcmp , 175.Fn strncmp , 176.Fn strcpy , 177.Fn strncpy , 178.Fn strcoll , 179.Fn strerror , 180.Fn strlen , 181.Fn strpbrk , 182.Fn strsep , 183.Fn strspn , 184.Fn strcspn , 185.Fn strstr , 186.Fn strtok , 187and 188.Fn strxfrm 189functions conform to 190.St -ansiC . 191.Pp 192The 193.Fn strtok_r 194function conforms to 195.St -p1003.1c-95 . 196.Pp 197The 198.Fn strerror_r 199function conforms to 200.St -p1003.1-2001 . 201