The Open Group Base Specifications Issue 8
IEEE Std 1003.1-2024
Copyright © 2001-2024 The IEEE and The Open Group

NAME

memmove — copy bytes in memory with overlapping areas

SYNOPSIS

#include <string.h>

void *memmove(void *
s1, const void *s2, size_t n);

DESCRIPTION

[CX] [Option Start] The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard. [Option End]

The memmove() function shall copy n bytes from the object pointed to by s2 into the object pointed to by s1. Copying takes place as if the n bytes from the object pointed to by s2 are first copied into a temporary array of n bytes that does not overlap the objects pointed to by s1 and s2, and then the n bytes from the temporary array are copied into the object pointed to by s1.

[CX] [Option Start] The memmove() function shall not change the setting of errno on valid input. [Option End]

RETURN VALUE

The memmove() function shall return s1; no return value is reserved to indicate an error.

ERRORS

No errors are defined.


The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

XBD <string.h>

CHANGE HISTORY

First released in Issue 4. Derived from the ANSI C standard.

Issue 8

Austin Group Defect 448 is applied, adding a requirement that memmove() does not change the setting of errno on valid input.

End of informative text.

 

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