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

1.1     ! root        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)

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