mirror of https://github.com/mkerrisk/man-pages
84 lines
2.8 KiB
Groff
84 lines
2.8 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Mon Apr 12 12:51:24 1993, David Metcalfe
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.\" 2006-05-19, Justin Pryzby <pryzbyj@justinpryzby.com>
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.\" Document strchrnul(3).
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.\"
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.TH STRCHR 3 2006-05-19 "GNU" "Linux Programmer's Manual"
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.SH NAME
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strchr, strrchr, strchrnul \- locate character in string
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.SH SYNOPSIS
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.nf
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.B #include <string.h>
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.sp
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.BI "char *strchr(const char *" s ", int " c );
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.sp
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.BI "char *strrchr(const char *" s ", int " c );
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.sp
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.B #define _GNU_SOURCE
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.B #include <string.h>
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.sp
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.BI "char *strchrnul(const char *" s ", int " c );
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.fi
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.SH DESCRIPTION
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The \fBstrchr\fP() function returns a pointer to the first occurrence
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of the character \fIc\fP in the string \fIs\fP.
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.PP
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The \fBstrrchr\fP() function returns a pointer to the last occurrence
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of the character \fIc\fP in the string \fIs\fP.
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.PP
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The \fBstrchrnul\fP() function is like \fBstrchr\fP()
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except that if \fIc\fP is not found in \fIs\fP,
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then it returns a pointer to the null byte
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at the end of \fIs\fP, rather than NULL.
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.PP
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Here "character" means "byte"; these functions do not work with
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wide or multi-byte characters.
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.SH "RETURN VALUE"
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The \fBstrchr\fP() and \fBstrrchr\fP() functions return a pointer to
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the matched character or NULL if the character is not found.
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The \fBstrchrnul\fP() function returns a pointer to
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the matched character,
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or a pointer to the null
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byte at the end of \fIs\fP (i.e., \fIs+strlen(s)\fP)
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if the character is not found.
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.SH "CONFORMING TO"
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SVID 3, POSIX, 4.3BSD, ISO 9899
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.SH "SEE ALSO"
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.BR index (3),
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.BR memchr (3),
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.BR rindex (3),
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.BR strlen (3),
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.BR strpbrk (3),
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.BR strsep (3),
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.BR strspn (3),
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.BR strstr (3),
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.BR strtok (3),
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.BR wcschr (3),
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.BR wcsrchr (3)
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