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annotate lib/memmove.c @ 40186:8964917f9574

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author Karl Berry <karl@freefriends.org>
date Mon, 18 Feb 2019 08:02:49 -0800
parents e8d2c6fc33ad
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Jim Meyering <jim@meyering.net>
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1 /* memmove.c -- copy memory.
Jim Meyering <jim@meyering.net>
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2 Copy LENGTH bytes from SOURCE to DEST. Does not null-terminate.
Jim Meyering <jim@meyering.net>
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3 In the public domain.
Jim Meyering <jim@meyering.net>
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4 By David MacKenzie <djm@gnu.ai.mit.edu>. */
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5
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6 #include <config.h>
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7
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8 #include <stddef.h>
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9
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10 void *
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11 memmove (void *dest0, void const *source0, size_t length)
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12 {
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13 char *dest = dest0;
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14 char const *source = source0;
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15 if (source < dest)
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16 /* Moving from low mem to hi mem; start at end. */
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17 for (source += length, dest += length; length; --length)
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18 *--dest = *--source;
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19 else if (source != dest)
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20 {
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21 /* Moving from hi mem to low mem; start at beginning. */
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22 for (; length; --length)
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23 *dest++ = *source++;
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24 }
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25 return dest0;
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26 }