FreeCalypso > hg > fc-pcsc-tools

annotate libutil/hexread.c @ 178:cd6a884b8657

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data: grcard2-blank-state captured
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 02 Mar 2021 05:10:12 +0000
parents f064dbcc5f41
children fc1635333d81
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1 /*
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2 * This module contains the function for reading hex files,
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3 * to be used in the implementation of manual write commands.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <ctype.h>
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10
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11 extern FILE *open_script_input_file();
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12
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13 read_hex_data_file(filename, databuf, maxlen)
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14 char *filename;
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15 u_char *databuf;
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16 unsigned maxlen;
0
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17 {
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18 FILE *inf;
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19 unsigned count;
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20 int c, c2;
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21
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22 inf = open_script_input_file(filename);
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23 if (!inf) {
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24 perror(filename);
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25 return(-1);
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26 }
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27 for (count = 0; ; count++) {
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28 do
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29 c = getc(inf);
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30 while (isspace(c));
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31 if (c < 0)
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32 break;
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33 if (!isxdigit(c)) {
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34 inv_input: fprintf(stderr, "%s: invalid hex file input\n",
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35 filename);
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36 fclose(inf);
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37 return(-1);
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38 }
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39 c2 = getc(inf);
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40 if (!isxdigit(c2))
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41 goto inv_input;
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42 if (count >= maxlen) {
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43 fprintf(stderr, "%s: hex input data is too long\n",
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44 filename);
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45 fclose(inf);
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46 return(-1);
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47 }
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48 databuf[count] = (decode_hex_digit(c) << 4) |
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49 decode_hex_digit(c2);
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50 }
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51 fclose(inf);
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52 if (!count) {
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53 fprintf(stderr, "%s: no hex data input found\n", filename);
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54 return(-1);
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55 }
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56 return(count);
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57 }