FreeCalypso > hg > fc-pcsc-tools

annotate libutil/hexstr.c @ 189:123dc7370581

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top Makefile: install scripts
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 Mar 2021 21:11:21 +0000
parents 3698c8192d2d
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 <stdio.h>
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8
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9 decode_hex_data_from_string(arg, databuf, minlen, maxlen)
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10 char *arg;
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11 u_char *databuf;
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12 unsigned minlen, maxlen;
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13 {
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14 unsigned count;
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15
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16 for (count = 0; ; count++) {
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17 while (isspace(*arg))
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18 arg++;
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19 if (!*arg)
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20 break;
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21 if (!isxdigit(arg[0]) || !isxdigit(arg[1])) {
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22 fprintf(stderr, "error: invalid hex string input\n");
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23 return(-1);
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24 }
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25 if (count >= maxlen) {
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26 fprintf(stderr, "error: hex string is too long\n");
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27 return(-1);
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28 }
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29 databuf[count] = (decode_hex_digit(arg[0]) << 4) |
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30 decode_hex_digit(arg[1]);
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31 arg += 2;
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32 }
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33 if (count < minlen) {
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34 fprintf(stderr, "error: hex string is too short\n");
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35 return(-1);
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36 }
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37 return(count);
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38 }