77b3625763
A GNU extension that returns dst + size instead of dst. It's a nice shortcut when copying strings with a known size or back-to-back blocks and you have to do it often. May of course be called directly or alternately through __builtin_mempcpy in some compiler versions. For ASM on native targets, it is implemented as an alternate entrypoint to memcpy which adds minimal code and overhead. Change-Id: I4cbb3483f6df3c1007247fe0a95fd7078737462b
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/*
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FUNCTION
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<<mempcpy>>---copy memory regions and return end pointer
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ANSI_SYNOPSIS
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#include <string.h>
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void* mempcpy(void *<[out]>, const void *<[in]>, size_t <[n]>);
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TRAD_SYNOPSIS
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void *mempcpy(<[out]>, <[in]>, <[n]>
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void *<[out]>;
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void *<[in]>;
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size_t <[n]>;
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DESCRIPTION
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This function copies <[n]> bytes from the memory region
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pointed to by <[in]> to the memory region pointed to by
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<[out]>.
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If the regions overlap, the behavior is undefined.
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RETURNS
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<<mempcpy>> returns a pointer to the byte following the
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last byte copied to the <[out]> region.
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PORTABILITY
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<<mempcpy>> is a GNU extension.
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<<mempcpy>> requires no supporting OS subroutines.
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*/
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#include "config.h"
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#include "_ansi.h" /* for _DEFUN */
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#include <string.h>
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/* This may be conjoined with memcpy in <cpu>/memcpy.S to get it nearly for
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free */
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_PTR
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_DEFUN (mempcpy, (dst0, src0, len0),
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_PTR dst0 _AND
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_CONST _PTR src0 _AND
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size_t len0)
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{
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return memcpy(dst0, src0, len0) + len0;
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}
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