string.h(0P)		   POSIX Programmer's Manual		  string.h(0P)

PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the corresponding
       Linux manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       string.h — string operations

SYNOPSIS
       #include <string.h>

DESCRIPTION
       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 POSIX.1‐2017, Section 2.2,
       The Compilation Environment) to enable the visibility of these symbols
       in this header.

       The <string.h> header shall define NULL and size_t as described in
       <stddef.h>.

       The <string.h> header shall define the locale_t type as described in
       <locale.h>.

       The following shall be declared as functions and may also be defined as
       macros. Function prototypes shall be provided for use with ISO C
       standard compilers.


	   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	   *stpcpy(char *restrict, const char *restrict);
	   char	   *stpncpy(char *restrict, const char *restrict, 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 *);
	   int	    strcoll_l(const char *, const char *, locale_t);
	   char	   *strcpy(char *restrict, const char *restrict);
	   size_t   strcspn(const char *, const char *);
	   char	   *strdup(const char *);
	   char	   *strerror(int);
	   char	   *strerror_l(int, locale_t);
	   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	   *strndup(const char *, size_t);
	   size_t   strnlen(const char *, size_t);
	   char	   *strpbrk(const char *, const char *);
	   char	   *strrchr(const char *, int);
	   char	   *strsignal(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 *restrict, const char *restrict, char **restrict);
	   size_t   strxfrm(char *restrict, const char *restrict, size_t);
	   size_t   strxfrm_l(char *restrict, const char *restrict,
			size_t, locale_t);

       Inclusion of the <string.h> header may also make visible all symbols
       from <stddef.h>.

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       <locale.h>, <stddef.h>, <sys_types.h>

       The System Interfaces volume of POSIX.1‐2017, Section 2.2, The
       Compilation Environment, memccpy(), memchr(), memcmp(), memcpy(),
       memmove(), memset(), strcat(), strchr(), strcmp(), strcoll(), strcpy(),
       strcspn(), strdup(), strerror(), strlen(), strncat(), strncmp(),
       strncpy(), strpbrk(), strrchr(), strsignal(), strspn(), strstr(),
       strtok(), strxfrm()

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group		     2017			  string.h(0P)