Nils O. Selåsdal
54 lines
1013 B
C
54 lines
1013 B
C
#include <ctype.h>
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#include <stdint.h>
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#include <stddef.h>
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#include "ucore/string.h"
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size_t
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uc_ascii2bcd(const char *restrict ascii, unsigned char *restrict bcdout, unsigned char filler)
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{
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unsigned char *bcdp = bcdout;
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int shift = 0;
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*bcdp = 0;
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for (; *ascii; ascii++) {
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if (*ascii < '0' || *ascii > '9') {
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continue;
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}
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if (shift) {
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*bcdp |= (*ascii - '0') << 4;
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bcdp++;
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} else {
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*bcdp = (*ascii - '0');
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}
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shift = !shift;
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}
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if (shift) {
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*bcdp |= (filler & 0xf) << 4;
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bcdp++;
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}
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return bcdp - bcdout;
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}
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static const char hex[] = "0123456789ABCDEF";
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size_t
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uc_bcd2ascii(const unsigned char *restrict bcd, size_t bcdlen, char *restrict asciiout)
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{
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size_t i;
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size_t idx = 0;
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for (i = 0; i < bcdlen; i++) {
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asciiout[idx++] = hex[bcd[i] & 0xf];
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asciiout[idx++] = hex[(bcd[i] & 0xf0) >> 4];
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}
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asciiout[idx] = 0;
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return idx;
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}
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