Placing values inside stings

[darfader]

Hi,

how do I incorporate a value inside a string ?

      strncpy(buffer, input.usernbr, USERNBR_LEN);
      buffer[USERNBR_LEN] = '\0';

      if(!isdigit(buffer) || is_all_spaces(input.usernbr, USERNBR_LEN))
      {
         strcpy(error_message, "EQ USERNBR INVALID - buffer\n");
         write_log_file(curtime,

/* OUTPUT */
---------------------------------------------------------------
Progname: eq_recon_mtn_cnx_format_eq
Started: 2003/10/15 09:57:15 GMT
File: R3AP200310_EQRSNACNXX_00001_20031014125499.SND
---------------------------------------------------------------

---> Number of Records Read: 1
---> Number of Records Written: 0

EQ USERNBR INVALID - buffer

---------------------------------------------------------------
Ended: 2003/10/15 09:57:15 GMT
---------------------------------------------------------------



what I should be getting is

EQ USERNBR INVALID - 85756999


strcpy does not seem to accept format specifiers, so presumably I have to pass the value though anther function first ?


tia,

[velius]

You would want to use sprintf() to write a formatted string to an array of chars. It works like this sprint(buffer, Formatted_string, arg_list). It is like printf only it requires a pointer to char as well.

[darfader]

your right,

this has done it for me

#define ERROR_MESSAGE       "EQ USERNBR INVALID - %s\n"


   if(error_value)
   {
      fprintf(fp, ERROR_MESSAGE, error_value);
      fprintf(fp, SPACES_ROW);
   }

/* OUTPUT */
---------------------------------------------------------------
Progname: eq_recon_mtn_cnx_format_eq
Started: 2003/10/15 11:37:27 GMT
File: R3AP200310_EQRSNACNXX_00001_20031014125499.SND
---------------------------------------------------------------

---> Number of Records Read: 7
---> Number of Records Written: 6

EQ USERNBR INVALID - ZZZZZZZZ

---------------------------------------------------------------
Ended: 2003/10/15 11:37:27 GMT
---------------------------------------------------------------



thanks velius