backport: memmove for overlapping mem copies.
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@ -376,7 +376,7 @@ buffer_gets( buffer_t * b, char **s )
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n = b->bytes - start;
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if (n)
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memcpy( b->buf, b->buf + start, n );
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memmove( b->buf, b->buf + start, n );
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b->offset -= start;
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b->bytes = n;
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start = 0;
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