4.3BSD - /usr/src/new/icon/functions/upto.c

   1: #include "../h/rt.h"
   2: 
   3: /*
   4:  * upto(c,s,i,j) - find each occurrence in s[i:j] of a character in c.
   5:  * Generates successive positions.
   6:  */
   7: 
   8: Xupto(nargs, arg4, arg3, arg2, arg1, arg0)
   9: int nargs;
  10: struct descrip arg4, arg3, arg2, arg1, arg0;
  11:    {
  12:    register int i, j;
  13:    int t;
  14:    long l1, l2;
  15:    int *cs, csbuf[CSETSIZE];
  16:    char sbuf[MAXSTRING];
  17: 
  18:    /*
  19:     * c must be a cset.  s defaults to &subject; i defaults to &pos if
  20:     *  s defaulted, 1 otherwise; j defaults to 0.
  21:     */
  22:    if (cvcset(&arg1, &cs, csbuf) == NULL)
  23:       runerr(104, &arg1);
  24:    if (defstr(&arg2, sbuf, &k_subject))
  25:       defint(&arg3, &l1, k_pos);
  26:    else
  27:       defint(&arg3, &l1, 1);
  28:    defint(&arg4, &l2, 0);
  29: 
  30:    /*
  31:     * Convert i and j to positions in s and order them.
  32:     */
  33:    i = cvpos(l1, STRLEN(arg2));
  34:    j = cvpos(l2, STRLEN(arg2));
  35:    if (i > j) {
  36:       t = i;
  37:       i = j;
  38:       j = t;
  39:       }
  40: 
  41:    /*
  42:     * Look through s[i:j] and suspend position of each occurrence of
  43:     *  of a character in c.
  44:     */
  45:    while (i < j) {
  46:       if (tstb(STRLOC(arg2)[i-1], cs)) {
  47:          arg0.type = D_INTEGER;
  48:          INTVAL(arg0) = i;
  49:          suspend();
  50:          }
  51:       i++;
  52:       }
  53:    /*
  54:     * Eventually fail.
  55:     */
  56:    fail();
  57:    }
  58: 
  59: Procblock(upto,4)

Defined functions