FreeCalypso > hg > themwi-system-sw
annotate libsip/to_tag.c @ 178:b259e2722485
README: update for current status
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 09 Mar 2023 13:08:31 -0800 |
parents | 9ca6f0708237 |
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libsip: add extract_to_tag() function
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1 /* |
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2 * The function implemented in this module extracts the tag |
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3 * from the To header of a SIP destination server's response. |
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4 */ |
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5 |
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6 #include <ctype.h> |
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7 #include <string.h> |
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8 #include <strings.h> |
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9 #include <stdio.h> |
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10 #include <stdlib.h> |
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11 #include "parse.h" |
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12 |
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13 extern char *get_single_header(); |
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14 |
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15 char * |
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16 extract_to_tag(msg, expect_uri) |
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17 struct sip_pkt_rx *msg; |
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18 char *expect_uri; |
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19 { |
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20 char *cp, *tag; |
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21 int bracketed, c; |
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22 unsigned expect_uri_len; |
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23 |
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24 cp = get_single_header(msg, "To", "t", (int *) 0); |
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25 if (!cp) |
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26 return 0; |
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27 if (*cp == '<') { |
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28 cp++; |
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29 bracketed = 1; |
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30 } else |
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31 bracketed = 0; |
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32 expect_uri_len = strlen(expect_uri); |
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33 if (strncasecmp(cp, expect_uri, expect_uri_len)) |
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34 return 0; |
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35 cp += expect_uri_len; |
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36 if (bracketed) { |
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37 if (*cp++ != '>') |
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38 return 0; |
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39 } |
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40 while (isspace(*cp)) |
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41 cp++; |
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42 if (*cp++ != ';') |
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43 return 0; |
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44 while (isspace(*cp)) |
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45 cp++; |
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46 if (strncasecmp(cp, "tag", 3)) |
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47 return 0; |
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48 cp += 3; |
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49 while (isspace(*cp)) |
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50 cp++; |
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51 if (*cp++ != '=') |
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52 return 0; |
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53 while (isspace(*cp)) |
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54 cp++; |
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55 tag = cp; |
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56 for (; c = *cp; cp++) { |
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57 switch (c) { |
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58 case '-': |
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59 case '.': |
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60 case '!': |
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61 case '%': |
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62 case '*': |
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63 case '_': |
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64 case '+': |
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65 case '`': |
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66 case '\'': |
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67 case '~': |
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68 continue; |
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69 default: |
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70 if (isalnum(c)) |
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71 continue; |
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72 return 0; |
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73 } |
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74 } |
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75 return tag; |
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76 } |