<string.h>(0P) POSIX Programmer's Manual <string.h>(0P)
NAMEstring.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 IEEE Std 1003.1-2001, Sec‐
tion 2.2, The Compilation Environment) to enable the visibility of
these symbols in this header.
The <string.h> header shall define the following:
NULL Null pointer constant.
size_t As described in <stddef.h> .
The following shall be declared as functions and may also be defined as
macros. Function prototypes shall be provided.
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);
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
<stddef.h>, <sys/types.h>, the System Interfaces volume of
IEEE Std 1003.1-2001, memccpy(), memchr(), memcmp(), memcpy(), mem‐
move(), memset(), strcat(), strchr(), strcmp(), strcoll(), strcpy(),
strcspn(), strdup(), strerror(), strlen(), strncat(), strncmp(),
strncpy(), strpbrk(), strrchr(), strspn(), strstr(), strtok(),
strxfrm()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 .
IEEE/The Open Group 2003 <string.h>(0P)
