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annotate serial/hexinput.c @ 43:be27d1c85861

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serial: main function implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Mar 2021 21:49:59 +0000
parents pcsc/main.c@60fd23186e2e
children
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45ea06eaa9fd fc-pcsc-backend main program put together
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1 #include <sys/types.h>
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2 #include <ctype.h>
1
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3 #include <stdio.h>
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4
3
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5 static
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6 decode_hex_digit(c)
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7 {
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8 if (isdigit(c))
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9 return c - '0';
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10 else if (islower(c))
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11 return c - 'a' + 10;
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12 else
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13 return c - 'A' + 10;
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14 }
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16 parse_hex_input(inbuf, outbuf)
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17 char *inbuf;
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18 u_char *outbuf;
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19 {
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20 char *cp;
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21 unsigned count;
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22
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23 count = 0;
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24 for (cp = inbuf; ; ) {
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25 while (isspace(*cp))
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26 cp++;
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27 if (!*cp)
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28 break;
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29 if (!isxdigit(cp[0]) || !isxdigit(cp[1])) {
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30 printf("error: invalid hex APDU input\n");
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31 return(-1);
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32 }
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33 if (count >= 260) {
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34 printf("error: command APDU is too long\n");
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35 return(-1);
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36 }
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37 outbuf[count++] = (decode_hex_digit(cp[0]) << 4) |
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38 decode_hex_digit(cp[1]);
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39 cp += 2;
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40 }
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41 return count;
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42 }