FreeCalypso > hg > themwi-system-sw

annotate libutil/numstring.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents d712d518059e
children
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d712d518059e libutil: add functions for number string parsing/preening
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1 /*
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2 * Utility functions for number string initial parsing or preening.
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3 * grok_number_string() checks whether or not a user-supplied string
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4 * argument is fully numeric (with possibility of allowing hyphens),
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5 * and returns the number of digits. dehyphen_number_string() copies
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6 * a possibly-hyphenated number string to a new buffer with all hyphens
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7 * taken out.
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8 */
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9
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10 #include <ctype.h>
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11
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12 grok_number_string(str, allow_hyphen)
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13 char *str;
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14 {
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15 char *cp;
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16 int c, n, last_hyphen;
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17
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18 n = 0;
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19 last_hyphen = 0;
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20 for (cp = str; *cp; ) {
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21 c = *cp++;
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22 if (isdigit(c)) {
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23 n++;
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24 last_hyphen = 0;
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25 } else if (c == '-') {
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26 if (!allow_hyphen || !n || last_hyphen)
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27 return(-1);
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28 last_hyphen = 1;
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29 } else
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30 return(-1);
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31 }
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32 if (last_hyphen)
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33 return(-1);
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34 return n;
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35 }
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36
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37 dehyphen_number_string(src, dest)
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38 char *src, *dest;
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39 {
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40 char *cp, *dp;
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41 int c;
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42
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43 dp = dest;
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44 for (cp = src; *cp; ) {
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45 c = *cp++;
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46 if (isdigit(c))
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47 *dp++ = c;
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48 }
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49 *dp = '\0';
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50 }