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

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * many(c,s,i,j) - find longest prefix of s[i:j] of characters in c.
        !             5:  */
        !             6: 
        !             7: Xmany(nargs, arg4, arg3, arg2, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg4, arg3, arg2, arg1, arg0;
        !            10:    {
        !            11:    register int i, j;
        !            12:    int t, *cs, csbuf[CSETSIZE];
        !            13:    long l1, l2;
        !            14:    char sbuf[MAXSTRING];
        !            15: 
        !            16:    /*
        !            17:     * c must be a cset.  s defaults to &subject;  i defaults to &pos if s
        !            18:     *  defaulted, 1 otherwise;  j defaults to 0.
        !            19:     */
        !            20:    if (cvcset(&arg1, &cs, csbuf) == NULL)
        !            21:       runerr(104, &arg1);
        !            22:    if (defstr(&arg2, sbuf, &k_subject))
        !            23:       defint(&arg3, &l1, k_pos);
        !            24:    else
        !            25:       defint(&arg3, &l1, 1);
        !            26:    defint(&arg4, &l2, 0);
        !            27: 
        !            28:    /*
        !            29:     * Convert i and j to absolute positions and order them.  If i == j,
        !            30:     *  then the specified substring of s is the empty string and many
        !            31:     *  fails.
        !            32:     */
        !            33:    i = cvpos(l1, STRLEN(arg2));
        !            34:    j = cvpos(l2, STRLEN(arg2));
        !            35:    if (i == j)
        !            36:       fail();
        !            37:    if (i > j) {
        !            38:       t = i;
        !            39:       i = j;
        !            40:       j = t;
        !            41:       }
        !            42: 
        !            43:    /*
        !            44:     * Fail if first character of s[i:j] isn't in c.
        !            45:     */
        !            46:    if (!tstb(STRLOC(arg2)[i-1], cs))
        !            47:       fail();
        !            48: 
        !            49:    /*
        !            50:     * Move i along s[i:j] until a character that is not in c is found or
        !            51:     *  the end of the string is reached.
        !            52:     */
        !            53:    i++;
        !            54:    while (i < j && tstb(STRLOC(arg2)[i-1], cs))
        !            55:       i++;
        !            56: 
        !            57:    /*
        !            58:     * Return the position of the first character not in c.
        !            59:     */
        !            60:    arg0.type = D_INTEGER;
        !            61:    INTVAL(arg0) = i;
        !            62:    }
        !            63: 
        !            64: Procblock(many,4)

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