4.3BSD - /usr/src/new/icon/rt/cvint.c

   1: #include "../h/rt.h"
   2: 
   3: /*
   4:  * cvint - convert the value represented by d into an integer and write
   5:  *  the value into the location referenced by i.  cvint returns one of
   6:  *  T_INTEGER, T_LONGINT, and NULL depending on the outcome of the conversion.
   7:  */
   8: 
   9: cvint(d, i)
  10: register struct descrip *d;
  11: long *i;
  12:    {
  13:    DclSave
  14:    union numeric result;
  15: 
  16:    /*
  17:     * Use cvnum to attempt the conversion into "result".
  18:     */
  19:    switch (cvnum(d, &result)) {
  20:       case T_LONGINT:
  21:          /*
  22:           * The value converted into an integer.  Assign the value to *i.
  23:           *  On systems with longs, distinguish between integer and long
  24:           *  integer results via the return value.
  25:           */
  26:          *i = result.integer;
  27: #ifdef LONGS
  28:          if (*i < (long)(int)MINSHORT || *i > (long)(int)MAXSHORT)
  29:             return (T_LONGINT);
  30: #endif LONGS
  31:          return (T_INTEGER);
  32: 
  33:       case T_REAL:
  34:          /*
  35:           * The value converted into a real number.  If it's not in the
  36:           *  range of an integer, return a 0, otherwise convert the
  37:           *  real value into an integer.  As before, distinguish between
  38:           *  integers and long integers if necessary.
  39:           */
  40:          if (result.real > MAXLONG || result.real < MINLONG)
  41:             return (NULL);
  42:          *i = (long)result.real;
  43: #ifdef LONGS
  44:          if (*i < MINSHORT || *i > MAXSHORT)
  45:             return (T_LONGINT);
  46: #endif LONGS
  47:          return (T_INTEGER);
  48: 
  49:       default:
  50:          return (NULL);
  51:       }
  52:    }

Defined functions