FreeCalypso > hg > themwi-ota-tools

annotate libutil/hexstdin.c @ 1:b149db92cb0e

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libutil started
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Feb 2021 19:08:14 +0000
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1 /*
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2 * This module contains the function for reading hex data from stdin.
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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 #include <stdlib.h>
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9
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10 read_hex_from_stdin(databuf, maxlen)
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11 u_char *databuf;
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12 unsigned maxlen;
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13 {
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14 unsigned count;
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15 int c, c2;
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16
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17 for (count = 0; ; count++) {
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18 do
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19 c = getchar();
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20 while (isspace(c));
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21 if (c < 0)
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22 break;
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23 if (!isxdigit(c)) {
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24 inv_input: fprintf(stderr, "error: invalid hex input on stdin\n");
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25 return(-1);
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26 }
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27 c2 = getchar();
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28 if (!isxdigit(c2))
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29 goto inv_input;
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30 if (count >= maxlen) {
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31 fprintf(stderr, "error: stdin hex data is too long\n");
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32 return(-1);
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33 }
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34 databuf[count] = (decode_hex_digit(c) << 4) |
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35 decode_hex_digit(c2);
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36 }
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37 if (!count) {
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38 fprintf(stderr, "error: no hex data given on stdin\n");
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39 return(-1);
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40 }
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41 return(count);
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42 }