.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
.TH "<string.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
.\" <string.h> 
.SH NAME
string.h \- string operations
.SH SYNOPSIS
.LP
\fB#include <string.h>\fP
.SH DESCRIPTION
.LP
Some of the functionality described on this reference page extends
the ISO\ C standard. Applications shall define
the appropriate feature test macro (see the System Interfaces volume
of IEEE\ Std\ 1003.1-2001, Section 2.2, The Compilation Environment)
to enable the visibility of these symbols in this
header. 
.LP
The \fI<string.h>\fP header shall define the following:
.TP 7
NULL
Null pointer constant.
.TP 7
\fBsize_t\fP
As described in \fI<stddef.h>\fP .
.sp
.LP
The following shall be declared as functions and may also be defined
as macros. Function prototypes shall be provided.
.sp
.RS
.nf

\fB
void    *memccpy(void *restrict, const void *restrict, int, size_t);

void    *memchr(const void *, int, size_t);
int      memcmp(const void *, const void *, size_t);
void    *memcpy(void *restrict, const void *restrict, size_t);
void    *memmove(void *, const void *, size_t);
void    *memset(void *, int, size_t);
char    *strcat(char *restrict, const char *restrict);
char    *strchr(const char *, int);
int      strcmp(const char *, const char *);
int      strcoll(const char *, const char *);
char    *strcpy(char *restrict, const char *restrict);
size_t   strcspn(const char *, const char *);

char    *strdup(const char *);

char    *strerror(int);

int     *strerror_r(int, char *, size_t);

size_t   strlen(const char *);
char    *strncat(char *restrict, const char *restrict, size_t);
int      strncmp(const char *, const char *, size_t);
char    *strncpy(char *restrict, const char *restrict, size_t);
char    *strpbrk(const char *, const char *);
char    *strrchr(const char *, int);
size_t   strspn(const char *, const char *);
char    *strstr(const char *, const char *);
char    *strtok(char *restrict, const char *restrict);

char    *strtok_r(char *, const char *, char **);

size_t   strxfrm(char *restrict, const char *restrict, size_t);
\fP
.fi
.RE
.LP
Inclusion of the \fI<string.h>\fP header may also make visible all
symbols from \fI<stddef.h>\fP. 
.LP
\fIThe following sections are informative.\fP
.SH APPLICATION USAGE
.LP
None.
.SH RATIONALE
.LP
None.
.SH FUTURE DIRECTIONS
.LP
None.
.SH SEE ALSO
.LP
\fI<stddef.h>\fP , \fI<sys/types.h>\fP , the System
Interfaces volume of IEEE\ Std\ 1003.1-2001, \fImemccpy\fP(), \fImemchr\fP(),
\fImemcmp\fP(), \fImemcpy\fP(), \fImemmove\fP(), \fImemset\fP(), \fIstrcat\fP(),
\fIstrchr\fP(), \fIstrcmp\fP(), \fIstrcoll\fP(), \fIstrcpy\fP(), \fIstrcspn\fP(),
\fIstrdup\fP(), \fIstrerror\fP(), \fIstrlen\fP(), \fIstrncat\fP(),
\fIstrncmp\fP(), \fIstrncpy\fP(), \fIstrpbrk\fP(), \fIstrrchr\fP(),
\fIstrspn\fP(), \fIstrstr\fP(), \fIstrtok\fP(), \fIstrxfrm\fP()
.SH COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .