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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. void replace_callID ( char* msg,  char* newVal);
  6. main()
  7. {
  8.     char msg[100];
  9.     strcpy(msg, "test\r\nCall-Id: 1234\r\ntest");
  10.     replace_callID (msg,  "1112458254");
  11.     puts(msg);
  12. }
  13.  
  14. void strupr(char *string)
  15. {
  16.    while(*string)
  17.    {
  18.        if ( *string >= 'a' && *string <= 'z' )
  19.        {
  20.           *string = *string - 32;
  21.        }
  22.        string++;
  23.    }
  24. }
  25.  
  26. void replace_callID ( char* msg,  char* newVal)
  27. {
  28.     // assuming that the msg will allow to hold the bigger buffer if the newVal is greater than the existing Call-ID value
  29.     const char* callIdToken = "CALL-ID: ";
  30.     char *upper = strdup(msg);
  31.     strupr(upper);
  32.     char *callId = strstr(upper, callIdToken);
  33.     // find the CALL-ID (using the UPPER CASE message to find a case insensitive string)
  34.     if(callId)
  35.     {
  36.  
  37.         char *callIdEol = strstr(callId, "\r\n");
  38.         if(callIdEol)
  39.         {
  40.             // store the remaining part of the message in a variable
  41.             char *theRest = strdup(msg + (callIdEol - upper));
  42.             // terminate the msg string straight after the Call-ID
  43.             msg[(callId - upper) + strlen(callIdToken)] = 0;
  44.             // append new value
  45.             strcat(msg, newVal);
  46.             //append the remaining message
  47.             strcat(msg, theRest);
  48.             // free memory
  49.             free(theRest);
  50.         }
  51.     }
  52.     // free memory
  53.     free(upper);
  54. }
  55.  
Runtime error #stdin #stdout 0s 2424KB
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stdin
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Standard input is empty
stdout
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test
Call-Id: 1112458254
test
https://ideone.com/0DMwRx
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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