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#include "str.h"
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size_t str_copy(char *out,const char *in) {
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register char* s=out;
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register const char* t=in;
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for (;;) {
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if (!(*s=*t)) break;
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++s; ++t;
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if (!(*s=*t)) break;
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++s; ++t;
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if (!(*s=*t)) break;
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++s; ++t;
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if (!(*s=*t)) break;
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++s; ++t;
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}
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return (size_t)(s-out);
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}
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