| .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" Permission is granted to make and distribute verbatim copies of this |
| .\" manual provided the copyright notice and this permission notice are |
| .\" preserved on all copies. |
| .\" |
| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
| .\" the use of the information contained herein. The author(s) may not |
| .\" have taken the same level of care in the production of this manual, |
| .\" which is licensed free of charge, as they might when working |
| .\" professionally. |
| .\" |
| .\" Formatted or processed versions of this manual, if unaccompanied by |
| .\" the source, must acknowledge the copyright and authors of this work. |
| .\" %%%LICENSE_END |
| .\" |
| .\" References consulted: |
| .\" Linux libc source code |
| .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) |
| .\" 386BSD man pages |
| .\" Modified Mon Apr 12 12:51:24 1993, David Metcalfe |
| .\" 2006-05-19, Justin Pryzby <pryzbyj@justinpryzby.com> |
| .\" Document strchrnul(3). |
| .\" |
| .TH STRCHR 3 2019-03-06 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| strchr, strrchr, strchrnul \- locate character in string |
| .SH SYNOPSIS |
| .nf |
| .B #include <string.h> |
| .PP |
| .BI "char *strchr(const char *" s ", int " c ); |
| .PP |
| .BI "char *strrchr(const char *" s ", int " c ); |
| |
| .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
| .B #include <string.h> |
| .PP |
| .BI "char *strchrnul(const char *" s ", int " c ); |
| .fi |
| .SH DESCRIPTION |
| The |
| .BR strchr () |
| function returns a pointer to the first occurrence |
| of the character |
| .I c |
| in the string |
| .IR s . |
| .PP |
| The |
| .BR strrchr () |
| function returns a pointer to the last occurrence |
| of the character |
| .I c |
| in the string |
| .IR s . |
| .PP |
| The |
| .BR strchrnul () |
| function is like |
| .BR strchr () |
| except that if |
| .I c |
| is not found in |
| .IR s , |
| then it returns a pointer to the null byte |
| at the end of |
| .IR s , |
| rather than NULL. |
| .PP |
| Here "character" means "byte"; these functions do not work with |
| wide or multibyte characters. |
| .SH RETURN VALUE |
| The |
| .BR strchr () |
| and |
| .BR strrchr () |
| functions return a pointer to |
| the matched character or NULL if the character is not found. |
| The terminating null byte is considered part of the string, |
| so that if |
| .I c |
| is specified as \(aq\e0\(aq, |
| these functions return a pointer to the terminator. |
| .PP |
| The |
| .BR strchrnul () |
| function returns a pointer to the matched character, |
| or a pointer to the null byte at the end of |
| .I s |
| (i.e., |
| .IR "s+strlen(s)" ) |
| if the character is not found. |
| .SH VERSIONS |
| .BR strchrnul () |
| first appeared in glibc in version 2.1.1. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lbw32 lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR strchr (), |
| .BR strrchr (), |
| .BR strchrnul () |
| T} Thread safety MT-Safe |
| .TE |
| .SH CONFORMING TO |
| .BR strchr (), |
| .BR strrchr (): |
| POSIX.1-2001, POSIX.1-2008, C89, C99, SVr4, 4.3BSD. |
| .PP |
| .BR strchrnul () |
| is a GNU extension. |
| .SH SEE ALSO |
| .BR index (3), |
| .BR memchr (3), |
| .BR rindex (3), |
| .BR string (3), |
| .BR strlen (3), |
| .BR strpbrk (3), |
| .BR strsep (3), |
| .BR strspn (3), |
| .BR strstr (3), |
| .BR strtok (3), |
| .BR wcschr (3), |
| .BR wcsrchr (3) |