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#include "case.h"
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void case_lowerb(void *S,size_t len) {
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char* s=(char*)S;
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unsigned char x;
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while (len > 0) {
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--len;
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x = *s - 'A';
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if (x <= 'Z' - 'A') *s = x + 'a';
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++s;
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}
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}
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