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 IEEE Std 1003.1-2001,
       Section 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(),  memmove(),  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>(P)