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based on an earlier version of the Wolfram Language.
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MathLink C Function


MLMARK MLSeekToMark(MLINK link, MLMARK mark, int n)
goes to the position n expressions after the specified mark on a link.
  • MLSeekToMark() returns (MLMARK)0 in the event of an error and mark otherwise.
  • MLSeekToMark() is declared in the MathLink header file mathlink.h.
#include "mathlink.h"

/* look ahead in the expression stream on a link and reset */

void f(MLINK lp)
    MLMARK mark;
    mark = MLCreateMark(lp);
    if(mark (MLMARK)0)
        { /* unable to create mark in the stream on lp */ }

    /* now peek ahead and see what is coming */
        case MLTKINT:
            /* integer data */
        case MLTKREAL:
            /* floating-point data */

    /* now restore to the original point */
    mark = MLSeekToMark(lp, mark, 0);
    if(mark (MLMARK)0)
        { /* unable to seek to the mark position in lp */ }

    MLDestroyMark(lp, mark);