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.\" @(#)string.3 8.2 (Berkeley) 12/11/93 31.\" $FreeBSD: src/lib/libc/string/string.3,v 1.14 2007/01/09 00:28:12 imp Exp $ 32.\" 33.Dd February 23, 2018 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 strcpy , 49.Nm strlcpy , 50.Nm strncpy , 51.Nm strerror , 52.Nm strlen , 53.Nm strpbrk , 54.Nm strsep , 55.Nm strspn , 56.Nm strcspn , 57.Nm strstr , 58.Nm strtok , 59.Nm index , 60.Nm rindex 61.Nd string specific functions 62.Sh LIBRARY 63.Lb libc 64.Sh SYNOPSIS 65.In string.h 66.Ft char * 67.Fn stpcpy "char * restrict dst" "const char * restrict src" 68.Ft char * 69.Fn stpncpy "char * restrict dst" "const char * restrict src" "size_t count" 70.Ft char * 71.Fn strcat "char * restrict s" "const char * restrict append" 72.Ft size_t 73.Fn strlcat "char * restrict dst" "const char * restrict src" "size_t count" 74.Ft char * 75.Fn strncat "char * restrict s" "const char * restrict append" "size_t count" 76.Ft char * 77.Fn strchr "const char *s" "int c" 78.Ft char * 79.Fn strrchr "const char *s" "int c" 80.Ft int 81.Fn strcmp "const char *s1" "const char *s2" 82.Ft int 83.Fn strncmp "const char *s1" "const char *s2" "size_t count" 84.Ft int 85.Fn strcasecmp "const char *s1" "const char *s2" 86.Ft int 87.Fn strncasecmp "const char *s1" "const char *s2" "size_t count" 88.Ft char * 89.Fn strcpy "char * restrict dst" "const char * restrict src" 90.Ft size_t 91.Fn strlcpy "char * restrict dst" "const char * restrict src" "size_t count" 92.Ft char * 93.Fn strncpy "char * restrict dst" "const char * restrict src" "size_t count" 94.Ft char * 95.Fn strerror "int errno" 96.Ft size_t 97.Fn strlen "const char *s" 98.Ft char * 99.Fn strpbrk "const char *s" "const char *charset" 100.Ft char * 101.Fn strsep "char **stringp" "const char *delim" 102.Ft size_t 103.Fn strspn "const char *s" "const char *charset" 104.Ft size_t 105.Fn strcspn "const char *s" "const char *charset" 106.Ft char * 107.Fn strstr "const char *big" "const char *little" 108.Ft char * 109.Fn strtok "char * restrict s" "const char *restrict delim" 110.Ft char * 111.Fn strtok_r "char * restrict s" "const char *restrict delim" "char ** restrict last" 112.Ft char * 113.Fn index "const char *s" "int c" 114.Ft char * 115.Fn rindex "const char *s" "int c" 116.Sh DESCRIPTION 117The string 118functions manipulate strings terminated by a 119null byte. 120.Pp 121See the specific manual pages for more information. 122For manipulating variable length generic objects as byte 123strings (without the null byte check), see 124.Xr bstring 3 . 125.Pp 126Except as noted in their specific manual pages, 127the string functions do not test the destination 128for size limitations. 129.Sh SEE ALSO 130.Xr bstring 3 , 131.Xr index 3 , 132.Xr rindex 3 , 133.Xr stpcpy 3 , 134.Xr stpncpy 3 , 135.Xr strcasecmp 3 , 136.Xr strcat 3 , 137.Xr strchr 3 , 138.Xr strcmp 3 , 139.Xr strcpy 3 , 140.Xr strcspn 3 , 141.Xr strerror 3 , 142.Xr strlcat 3 , 143.Xr strlcpy 3 , 144.Xr strlen 3 , 145.Xr strpbrk 3 , 146.Xr strrchr 3 , 147.Xr strsep 3 , 148.Xr strspn 3 , 149.Xr strstr 3 , 150.Xr strtok 3 , 151.Xr strtok_r 3 152.Sh STANDARDS 153The 154.Fn strcat , 155.Fn strncat , 156.Fn strchr , 157.Fn strrchr , 158.Fn strcmp , 159.Fn strncmp , 160.Fn strcpy , 161.Fn strncpy , 162.Fn strerror , 163.Fn strlen , 164.Fn strpbrk , 165.Fn strspn , 166.Fn strcspn , 167.Fn strstr , 168and 169.Fn strtok 170functions 171conform to 172.St -isoC . 173