attr_copy.c

操作系统SunOS 4.1.3版本的源码

#ifndef lint
#ifdef sccs
static	char sccsid[] = "@(#)attr_copy.c 1.1 92/07/30 Copyr 1985 Sun Micro";
#endif
#endif

#include <sys/types.h>
#include <sunwindow/attr.h>

/*
 *	attr_copy:	copy an attribute list, returning the size in bytes
 */
int
attr_copy(source, dest)
    Attr_attribute    **source, **dest;
{
    unsigned            attr;
    unsigned            result, size;

    size = 0;
    do {
	attr = **source;
	result = copy_1_attr(attr, source, dest);
	if (result == -1)
	    return -1;
	size += result;
    } while (attr != 0);
    return size;
}

static int
copy_1_attr(attr, source, dest)
    Attr_attribute      attr, **source, **dest;
{
    int                 result, size;

    *source += 1;
    **dest = attr;
    *dest += 1;
    size = sizeof attr;
    if (attr == 0 || ATTR_BASE_TYPE(attr) == ATTR_BASE_NO_VALUE)
	return size;

    switch (ATTR_LIST_TYPE(attr)) {
      case ATTR_NONE:
	result = copy_singleton(attr, source, dest);
	break;
      case ATTR_NULL:
	result = copy_null_list(attr, source, dest);
	break;
      case ATTR_COUNTED:
	result = copy_counted_list(attr, source, dest);
	break;
      case ATTR_RECURSIVE:
	result = attr_copy(source, dest);
	break;
      default:
	return -1;
    }
    if (result == -1)
	return -1;
    else
	return size + result;
}

static int
copy_counted_list(attr, source, dest)
    Attr_attribute      attr, **source, **dest;
{
    register unsigned   count, n;
    register Attr_attribute *srcp, *destp;

    (void)ATTR_CARDINALITY(attr);
    srcp = *source;
    destp = *dest;
    count = *srcp++;
    *destp++ = count;
    for (n = count; n--;) {
	*destp++ = *srcp++;
    }
    *source = srcp;
    *dest = destp;
    return count + 1;

}

static int
copy_singleton(attr, source, dest)
    Attr_attribute      attr, **source, **dest;
{
    register int        count, size;
    register Attr_attribute *srcp, *destp;

    count = ATTR_CARDINALITY(attr);
    size = count * 4;
    srcp = *source;
    destp = *dest;
    while (count-- > 0) {
	*destp++ = *srcp++;
    }
    *source = srcp;
    *dest = destp;
    return size;
}

static int
copy_null_list(attr, source, dest)
    Attr_attribute      attr, **source, **dest;
{
    register int        count, size;
    register Attr_attribute *srcp, *destp;

    count = 0;
    size = ATTR_CARDINALITY(attr);
    srcp = *source;
    destp = *dest;
    while (*srcp != 0) {
	register int        i;

	for (i = size; i--;) {
	    *destp++ = *srcp++;
	    count++;
	}
    }
    *destp++ = *srcp++;
    count++;
    *source = srcp;
    *dest = destp;
    return count * sizeof attr;
}