duktape-1.5.2/src-separate/duk_hbufferobject_misc.c

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#include "duk_internal.h"
 
#if defined(DUK_USE_BUFFEROBJECT_SUPPORT)
DUK_INTERNAL duk_uint_t duk_hbufferobject_clamp_bytelength(duk_hbufferobject *h_bufobj, duk_uint_t len) {
    duk_uint_t buf_size;
    duk_uint_t buf_avail;
 
    DUK_ASSERT(h_bufobj != NULL);
    DUK_ASSERT(h_bufobj->buf != NULL);
 
    buf_size = (duk_uint_t) DUK_HBUFFER_GET_SIZE(h_bufobj->buf);
    if (h_bufobj->offset > buf_size) {
        /* Slice starting point is beyond current length. */
        return 0;
    }
    buf_avail = buf_size - h_bufobj->offset;
 
    return buf_avail >= len ? len : buf_avail;
}
#endif  /* DUK_USE_BUFFEROBJECT_SUPPORT */