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SWAB(3) Linux Programmer's Manual SWAB(3)
NAME
swab - swap adjacent bytes
SYNOPSIS
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
void swab(const void *restrict from, void *restrict to, ssize_t n);
DESCRIPTION
The swab() function copies n bytes from the array pointed to by from to the array pointed to by to, exchanging adjacent even and odd bytes. This function is
used to exchange data between machines that have different low/high byte ordering.
This function does nothing when n is negative. When n is positive and odd, it handles n-1 bytes as above, and does something unspecified with the last byte.
(In other words, n should be even.)
RETURN VALUE
The swab() function returns no value.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
│swab() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
SEE ALSO
bstring(3)
2021-03-22 SWAB(3)