string.h man page

Prolog

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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.1‐2008, 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.

See Also

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

The System Interfaces volume of POSIX.1‐2008, 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()

Info

2013 IEEE/The Open Group POSIX Programmer's Manual