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

   1: #include "../h/rt.h"
   2: 
   3: /*
   4:  * repl(s,n) - concatenate n copies of string s.
   5:  */
   6: Xrepl(nargs, arg2, arg1, arg0)
   7: int nargs;
   8: struct descrip arg2, arg1, arg0;
   9:    {
  10:    register int cnt;
  11:    register char *sloc;
  12:    long l1;
  13:    char sbuf[MAXSTRING];
  14:    extern char *alcstr();
  15: 
  16:    /*
  17:     * Make sure that s is a string.
  18:     */
  19:    if (cvstr(&arg1, sbuf) == NULL)
  20:       runerr(103, &arg1);
  21:    /*
  22:     * Make sure that n is a (non-long) integer.
  23:     */
  24:    switch (cvint(&arg2, &l1)) {
  25:       case T_INTEGER:
  26:          if ((cnt = (int)l1) >= 0)
  27:             break;
  28: #ifdef LONGS
  29:       case T_LONGINT:
  30: #endif LONGS
  31:             runerr(205, &arg2);
  32:       default:
  33:             runerr(101, &arg2);
  34:       }
  35: 
  36:    /*
  37:     * Be sure that resulting string won't be too long. (This is bogus
  38:     *  on the VAX as MAXSHORT is 32k.)
  39:     */
  40:    if ((l1 * STRLEN(arg1)) > MAXSHORT)
  41:       runerr(302, NULL);
  42:    /*
  43:     * Return a empty string if n == 0.
  44:     */
  45:    if (cnt == 0) {
  46:       arg0.type = D_NULL;
  47:       INTVAL(arg0) = 1;
  48:       }
  49:    else {
  50:       /*
  51:        * Ensure enough space for the replicated string and allocate a copy
  52:        *  of s.  Then allocate and copy s n-1 times.
  53:        */
  54:       sneed(cnt * STRLEN(arg1));
  55:       sloc = alcstr(STRLOC(arg1), STRLEN(arg1));
  56:       cnt--;
  57:       while (cnt--)
  58:          alcstr(STRLOC(arg1), STRLEN(arg1));
  59:       /*
  60:        * Make arg0 a descriptor for the replicated string.
  61:        */
  62:       STRLEN(arg0) = (int)l1 * STRLEN(arg1);
  63:       STRLOC(arg0) = sloc;
  64:       }
  65:    }
  66: 
  67: Procblock(repl,2)

Defined functions