simgear/metar/Antoi.cpp

   1 #include <stdlib.h>
   2
   3 /********************************************************************/
   4 /*                                                                  */
   5 /*  Title:         antoi                                            */
   6 /*  Date:          Jan 28, 1991                                     */
   7 /*  Organization:  W/OSO242 - Graphics and Display Section          */
   8 /*  Programmer:    Allan Darling                                    */
   9 /*  Language:      C/370                                            */
  10 /*                                                                  */
  11 /*  Abstract:      This function will convert a character array     */
  12 /*                 (string) of length (len) into an integer.        */
  13 /*                 The integer is created via a call to the         */
  14 /*                 function atoi.  This function extends the        */
  15 /*                 functionality of atoi by removing the            */
  16 /*                 requirement for a sentinal delimited string      */
  17 /*                 as input.                                        */
  18 /*                                                                  */
  19 /*  Input: - Pointer to an array of characters.                     */
  20 /*         - Integer indicating the number of character to include  */
  21 /*           in the conversion.                                     */
  22 /*                                                                  */
  23 /*  Output:- An integer corresponding to the value in the character */
  24 /*           array or INT32_MIN (-2147483647-1) if the function is  */
  25 /*           unable to acquire system storage.                      */
  26 /*                                                                  */
  27 /*  Modification History:                                           */
  28 /*                 None                                             */
  29 /*                                                                  */
  30 /********************************************************************/
  31
  32 #ifdef HAVE_STDINT_H
  33 #  include <stdint.h>
  34 #endif
  35
  36 #ifndef INT32_MIN
  37 #  define INT32_MIN (-2147483647-1)
  38 #endif
  39
  40 int antoi(char * string, int len)
  41 {
  42
  43     /*******************/
  44     /* local variables */
  45     /*******************/
  46
  47     char * tmpstr;
  48     int i,
  49         retval;
  50
  51
  52     /*****************/
  53     /* function body */
  54     /*****************/
  55
  56     tmpstr = (char *)malloc((len+1) * sizeof(char));
  57
  58     if (tmpstr == NULL) return INT32_MIN;
  59
  60     for (i = 0; i < len; i++)
  61        tmpstr[i] = string[i];
  62
  63     tmpstr[len] = '\0';
  64
  65     retval = atoi(tmpstr);
  66
  67     free(tmpstr);
  68
  69     return(retval);
  70
  71 } /* end antoi */
  72