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29 lines
833 B
C
29 lines
833 B
C
#include "byte.h"
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/* byte_copy copies in[0] to out[0], in[1] to out[1], ... and in[len-1]
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* to out[len-1]. */
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void byte_copy(void* out, unsigned long len, const void* in) {
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register char* s=out;
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register const char* t=in;
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register const char* u=t+len;
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if (len>127) {
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while ((unsigned long)s&(sizeof(unsigned long)-1)) {
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if (t==u) break; *s=*t; ++s; ++t;
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}
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/* s (destination) is now unsigned long aligned */
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#ifndef __i386__
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if (!((unsigned long)t&(sizeof(unsigned long)-1)))
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#endif
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while (t+sizeof(unsigned long)<=u) {
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*(unsigned long*)s=*(unsigned long*)t;
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s+=sizeof(unsigned long); t+=sizeof(unsigned long);
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}
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}
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for (;;) {
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if (t==u) break; *s=*t; ++s; ++t;
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if (t==u) break; *s=*t; ++s; ++t;
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if (t==u) break; *s=*t; ++s; ++t;
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if (t==u) break; *s=*t; ++s; ++t;
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}
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}
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