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annotate libtest/tw5reader.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 4d2cccaeb4a7
children
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1 /*
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2 * Here we implement our twts005_read_frame() function.
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3 */
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4
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5 #include <ctype.h>
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "tw5reader.h"
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12 static int decode_hex_digit(char c)
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13 {
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14 if (isdigit(c))
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15 return c - '0';
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16 else if (isupper(c))
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17 return c - 'A' + 10;
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18 else
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19 return c - 'a' + 10;
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20 }
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22 int twts005_read_frame(FILE *hexf, unsigned *lineno, uint8_t *frame,
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23 unsigned *lenp)
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24 {
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25 char linebuf[81];
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26 char *cp, *np;
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27 uint8_t *dp;
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28 unsigned len;
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29
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30 for (;;) {
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31 if (!fgets(linebuf, sizeof linebuf, hexf))
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32 return 0;
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33 (*lineno)++;
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34 if (!index(linebuf, '\n'))
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35 return -2;
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36 for (cp = linebuf; isspace(*cp); cp++)
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37 ;
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38 if (*cp != '\0' && *cp != '#')
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39 break;
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40 }
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41 for (np = cp; *cp && !isspace(*cp); cp++)
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42 ;
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43 if (*cp)
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44 *cp++ = '\0';
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45 while (isspace(*cp))
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46 cp++;
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47 if (*cp != '\0' && *cp != '#')
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48 return -1;
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49 if (!strcasecmp(np, "NULL")) {
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50 *lenp = 0;
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51 return 1;
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52 }
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54 dp = frame;
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55 len = 0;
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56 for (cp = np; *cp; cp += 2) {
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57 if (!isxdigit(cp[0]) || !isxdigit(cp[1]))
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58 return -1;
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59 *dp++ = (decode_hex_digit(cp[0]) << 4) |
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60 decode_hex_digit(cp[1]);
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61 len++;
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62 }
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63 *lenp = len;
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64 return 1;
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65 }