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POSIX 1003.1 - man page for string.h (posix section 0p)

<string.h>(P)				      POSIX Programmer's Manual 				<string.h>(P)

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(), mem- cmp(), 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 Speci- fications 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)


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