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annotate serial/baud_parse.c @ 40:8f505d413815

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serial: full baud/spenh argument parsing implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 20 Mar 2021 20:23:24 +0000
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40
8f505d413815 serial: full baud/spenh argument parsing implemented
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module handles the parsing of the baud rate and speed enhancement
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3 * command line argument.
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4 */
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5
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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 unsigned baud_base, baud_spenh, spenh_host_max;
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11
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12 void
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13 parse_baud_spenh_arg(arg)
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14 char *arg;
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15 {
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16 char *cp;
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17
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18 if (!isdigit(*arg)) {
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19 inv: fprintf(stderr,
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20 "error: invalid baud/spenh selection argument \"%s\"\n",
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21 arg);
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22 exit(1);
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23 }
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24 baud_base = strtoul(arg, &cp, 10);
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25 if (!*cp)
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26 return;
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27 if (*cp++ != ',')
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28 goto inv;
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29 if (!isdigit(*cp))
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30 goto inv;
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31 baud_spenh = strtoul(cp, &cp, 10);
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32 if (!*cp) {
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33 spenh_host_max = 1;
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34 return;
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35 }
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36 if (*cp++ != ',')
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37 goto inv;
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38 if (!isdigit(*cp) || cp[1])
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39 goto inv;
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40 spenh_host_max = *cp - '0';
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41 switch (spenh_host_max) {
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42 case 1:
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43 case 2:
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44 case 4:
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45 case 8:
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46 break;
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47 default:
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48 fprintf(stderr,
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49 "error: speed enhancement multiplier can only be 1, 2, 4 or 8\n");
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50 exit(1);
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51 }
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52 }