FreeCalypso > hg > fc-pcsc-tools

annotate libcommon/hexstr.c @ 83:07e395fddfe1

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lnd-write command implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 17 Feb 2021 06:08:28 +0000
parents f7145c77b7fb
children
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1 /*
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2 * This module contains the function for decoding hex strings.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <ctype.h>
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7 #include <string.h>
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8 #include <strings.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11
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12 decode_hex_digit(c)
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13 {
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14 if (c >= '0' && c <= '9')
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15 return(c - '0');
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16 if (c >= 'A' && c <= 'F')
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17 return(c - 'A' + 10);
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18 if (c >= 'a' && c <= 'f')
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19 return(c - 'a' + 10);
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20 return(-1);
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21 }
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22
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23 decode_hex_data_from_string(arg, databuf, minlen, maxlen)
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24 char *arg;
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25 u_char *databuf;
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26 unsigned minlen, maxlen;
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27 {
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28 unsigned count;
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29
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30 for (count = 0; ; count++) {
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31 while (isspace(*arg))
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32 arg++;
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33 if (!*arg)
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34 break;
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35 if (!isxdigit(arg[0]) || !isxdigit(arg[1])) {
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36 fprintf(stderr, "error: invalid hex string input\n");
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37 return(-1);
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38 }
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39 if (count >= maxlen) {
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40 fprintf(stderr, "error: hex string is too long\n");
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41 return(-1);
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42 }
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43 databuf[count] = (decode_hex_digit(arg[0]) << 4) |
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44 decode_hex_digit(arg[1]);
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45 arg += 2;
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46 }
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47 if (count < minlen) {
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48 fprintf(stderr, "error: hex string is too short\n");
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49 return(-1);
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50 }
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51 return(count);
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52 }