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Annotation of 43BSD/contrib/icon/functions/repl.c, revision 1.1

1.1     ! root        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)

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