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annotate libcommon/hexread.c @ 64:8cd4771bdd79

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doc/User-oriented-commands: document started
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Feb 2021 19:01:04 +0000
parents f7145c77b7fb
children 94d87d05f6c5
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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 <string.h>
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9 #include <strings.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12
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13 read_hex_data_file(filename, databuf)
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14 char *filename;
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15 u_char *databuf;
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16 {
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17 FILE *inf;
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18 unsigned count;
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19 int c, c2;
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20
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21 inf = fopen(filename, "r");
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22 if (!inf) {
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23 perror(filename);
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24 return(-1);
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25 }
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26 for (count = 0; ; count++) {
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27 do
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28 c = getc(inf);
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29 while (isspace(c));
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30 if (c < 0)
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31 break;
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32 if (!isxdigit(c)) {
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33 inv_input: fprintf(stderr, "%s: invalid hex file input\n",
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34 filename);
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35 fclose(inf);
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36 return(-1);
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37 }
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38 c2 = getc(inf);
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39 if (!isxdigit(c2))
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40 goto inv_input;
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41 if (count >= 255) {
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42 fprintf(stderr, "%s: hex input data is too long\n",
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43 filename);
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44 fclose(inf);
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45 return(-1);
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46 }
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47 databuf[count] = (decode_hex_digit(c) << 4) |
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48 decode_hex_digit(c2);
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49 }
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50 fclose(inf);
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51 if (!count) {
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52 fprintf(stderr, "%s: no hex data input found\n", filename);
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53 return(-1);
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54 }
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55 return(count);
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56 }