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Man Pages


Manual Reference Pages  -  MEMSWAP (3)

NAME

memswap - swap the contents of two memory blocks

CONTENTS

Synopsis
Description
Example
Bugs
Author

SYNOPSIS

#include <publib.h>
void memswap(void *block1, void *block2, size_t n);

DESCRIPTION

memswap will swap the contents of the two blocks pointed by its first two arguments. The last argument gives the size of the memory blocks.

EXAMPLE

To swap two structs, one might do the following.



struct tm tm1, tm2;

memswap(&tm1, &tm2, sizeof(struct tm));

BUGS

Using memswap to swap small portions of memory is inefficient. It is not worth it to use it to swap variables of any of the basic types, for instance. Use inline code for such cases. However, for large portions of memory, e.g., arrays, it is convenient.

memswap can’t swap variables whose address can’t be taken. This excludes variables with the register specifier and bitfields in structs. But then, there is no way to write a function (or macro) that can handle any kind of arguments. Life is hard.

SEE ALSO

publib(3)

AUTHOR

Lars Wirzenius (lars.wirzenius@helsinki.fi)
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Publib MEMSWAP (3) C Programmer's Manual

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