FreeCalypso > hg > themwi-system-sw

annotate libutil/imsi_entry.c @ 194:05d01e810217

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libutil: add TFO message gen function based on Osmocom crc8gen
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 17 Mar 2023 16:52:21 -0800
parents 40e5097437fa
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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40e5097437fa libutil: add grok_imsi_user_arg()
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * The library function implemented in this module supports IMSI entry
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3 * at UI level, either in the standard form (long string of digits)
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4 * or in the shorthand notation introduced in fc-sim-tools.
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5 */
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6
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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
40e5097437fa libutil: add grok_imsi_user_arg()
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11 grok_imsi_user_arg(arg, dest)
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12 char *arg, *dest;
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13 {
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14 char *cp, *dp;
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15 int n, tail_len, remain;
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16
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17 if (!isdigit(*arg))
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18 return(-1);
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19 cp = arg;
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20 dp = dest;
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21 n = 0;
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22 while (isdigit(*cp)) {
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23 if (n >= 15)
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24 return(-1);
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25 *dp++ = *cp++;
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26 n++;
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27 }
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28 if (!*cp) {
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29 if (n < 6)
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30 return(-1);
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31 *dp = '\0';
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32 return(0);
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33 }
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34 if (*cp != '-')
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35 return(-1);
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36 cp++;
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37 tail_len = strlen(cp);
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38 if (!tail_len)
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39 return(-1);
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40 remain = 15 - n;
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41 if (remain < tail_len + 1)
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42 return(-1);
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43 while (remain > tail_len) {
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44 *dp++ = '0';
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45 remain--;
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46 }
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47 while (*cp) {
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48 if (!isdigit(*cp))
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49 return(-1);
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50 *dp++ = *cp++;
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51 }
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52 *dp = '\0';
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53 return(0);
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54 }