asn_sequence_of.c

来自「H.248协议编解码协议栈」· C语言 代码 · 共 42 行

/*-
 * Copyright (c) 2003, 2004 Lev Walkin <[e-mail]>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <asn_SEQUENCE_OF.h>

typedef A_SEQUENCE_OF(void) asn_sequence;

void
asn_sequence_del(void *asn_sequence_of_x, int number, int _do_free) {
	asn_sequence *as = (asn_sequence *)asn_sequence_of_x;

	if(as) {
		void *ptr;
		int n;

		if(number < 0 || number >= as->count)
			return;	/* Nothing to delete */

		if(_do_free && as->free) {
			ptr = as->array[number];
		} else {
			ptr = 0;
		}

		/*
		 * Shift all elements to the left to hide the gap.
		 */
		--as->count;
		for(n = number; n < as->count; n++)
			as->array[n] = as->array[n+1];

		/*
		 * Invoke the third-party function only when the state
		 * of the parent structure is consistent.
		 */
		if(ptr) as->free(ptr);
	}
}