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Annotation of 43BSD/contrib/icon/rt/cvpos.c, revision 1.1.1.1

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * cvpos - convert position to strictly positive position
                      5:  *  given string or list length.
                      6:  */
                      7: 
                      8: cvpos(pos, len)
                      9: long pos;
                     10: register int len;
                     11:    {
                     12:    DclSave
                     13:    register int p;
                     14: 
                     15:    /*
                     16:     * Fail if the position isn't in the range of an int. (?)
                     17:     */
                     18:    if ((long)(p = pos) != pos)
                     19:       fail();
                     20:    /*
                     21:     * Fail if the position is off either end of the string.
                     22:     */
                     23:    if (p < -len || p > len + 1)
                     24:       fail();
                     25:    /*
                     26:     * If the position is greater than zero, just return it.  Otherwise,
                     27:     *  convert the zero/negative position.
                     28:     */
                     29:    if (pos > 0)
                     30:       return (p);
                     31:    return (len + p + 1);
                     32:    }

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