email_database.cxx

LINUX下的收发E-MAIL的程序

#include 	"Email_database.h"

char buffer[20] = "", tempbuf[100];

int add_changelog2db(CHANGELOG * buf, int db_id)
{
    if (db_add_record(db_id, buf, MAXCHLOG) == 0) {
	printf("add record(numchr) to database error!\n");
	return -1;
    }
    return 0;
}


int sort_changelog_database(int db_id)
{
    int key_offset, key_length;
    struct key_field kf;

    get_field_offset_and_length(loginfo, order, key_offset, key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if (db_new_sort(db_id, kf) == 0) {
	printf("sort loginfo error!\n");
	return -1;
    }
    return 0;
}


int del_chlog(int db_id, int order)
{
    int flag, n, db_num;
    struct loginfo *buf;

    buf = (struct loginfo *) malloc(MAXCHLOG);

    db_num = db_get_record_number(changelog_id);
    printf("chlog db_num = %d\n", db_num);
    sort_changelog_database(db_id);

    db_change_current_pos(db_id, order);

    flag = db_delete_current_record(db_id);
    if (flag >= 0 || flag == -1)
	printf("dele log info succeed!\n");

    if (db_num != order + 1) {
	for (;;) {
	    db_get_current_pos(db_id, buf);
	    printf("buf->order: %d; buf->mailid: %d; buf->opid: %d\n",
		   buf->order, buf->mailid, buf->opid);
	    buf->order--;
	    db_modify_current(db_id, buf, MAXCHLOG);
	    if ((n = db_get_next(db_id, buf)) == -1)
		break;
	}
    }
    return 0;
}


int changelog_data_create()
{
    int key_offset, key_length;
    int db_id;
    struct key_field kf;

    get_field_offset_and_length(loginfo, order, key_offset, key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if ((db_id = db_register("chlog", &kf, MAXCHLOG, MAXCHLOG)) == 0) {
	db_create("chlog");
	db_id = db_register("chlog", &kf, MAXCHLOG, MAXCHLOG);
    }
    if (db_id == 0) {
	printf("create/register chlog database error!\n");
	return -1;
    } else
	return db_id;
}


int sort_setnum_database(int db_id)
{
    int key_offset, key_length;
    struct key_field kf;

    get_field_offset_and_length(numberset, chr_num, key_offset,
				key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if (db_new_sort(db_id, kf) == 0) {
	printf("sort numset error!\n");
	return -1;
    }
    return 0;
}


int setnum_data_create()
{
    int key_offset, key_length;
    int db_id;
    struct key_field kf;

    get_field_offset_and_length(numberset, chr_num, key_offset,
				key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if ((db_id = db_register("setnum", &kf, MAXCHRNUM, MAXCHRNUM)) == 0) {
	db_create("setnum");
	db_id = db_register("setnum", &kf, MAXCHRNUM, MAXCHRNUM);
    }
    if (db_id == 0) {
	printf("create/register setnum database error!\n");
	return -1;
    } else
	return db_id;
}


int sort_newmail_database(int db_id)
{
    int key_offset, key_length;
    struct key_field kf;

    get_field_offset_and_length(new_email, mail_line, key_offset,
				key_length);
    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if (db_new_sort(db_id, kf) == 0) {
	printf("sort newmail error!\n");
	return -1;
    }
    return 0;
}


int newmail_data_create()
{
    int key_offset, key_length;
    int db_id;
    struct key_field kf;

    get_field_offset_and_length(new_email, mail_line, key_offset,
				key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    db_id = db_register("newmail", &kf, MAXNEWMAIL, MAXNEWMAIL);
    if (db_id == 0) {
	db_create("newmail");
	db_id = db_register("newmail", &kf, MAXNEWMAIL, MAXNEWMAIL);
    }
    if (db_id == 0) {
	printf("create/register newmail database error!\n");
	return -1;
    } else
	return db_id;
}


int sort_oldmail_database(int db_id)
{
    int key_offset, key_length;
    struct key_field kf;

    get_field_offset_and_length(new_rvmail, mail_line, key_offset,
				key_length);
    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    if (db_new_sort(db_id, kf) == 0) {
	printf("sort oldmail error!\n");
	return -1;
    }
    return 0;
}


int oldmail_data_create()
{
    int key_offset, key_length;
    int db_id;
    struct key_field kf;

    get_field_offset_and_length(new_rvmail, mail_line, key_offset,
				key_length);

    kf.offset = key_offset;
    kf.size = key_length;
    kf.key_type = KEY_INT;

    db_id = db_register("oldmail", &kf, MAXRCVMAIL, MAXRCVMAIL);
    if (db_id == 0) {
	db_create("oldmail");
	db_id = db_register("oldmail", &kf, MAXRCVMAIL, MAXRCVMAIL);
    }

    if (db_id == 0) {
	printf("create/register oldmail database error!\n");
	return -1;
    } else
	return db_id;
}


int unreg_database(int num_id, int new_id, int old_id, int ch_id)
{
    int unreg;
    int db_num;
    struct loginfo *buf;

    if ((unreg = db_unregister(num_id)) == 0) {
	printf("unregister setnum database error!\n");
	return -1;
    }
    if ((unreg = db_unregister(new_id)) == 0) {
	printf("unregister newmail database error!\n");
	return -1;
    }
    if ((unreg = db_unregister(old_id)) == 0) {
	printf("unregister oldmail database error!\n");
	return -1;
    }

    buf = (struct loginfo *) malloc(MAXCHLOG);
    db_num = db_get_record_number(ch_id);
    buf->order = db_num;
    buf->mailid = total_mailid;
    buf->opid = 0;
    strncpy(buf->user, USERNAME, 20);
    add_changelog2db(buf, ch_id);
    free(buf);

    if ((unreg = db_unregister(ch_id)) == 0) {
	printf("unregister changelog database error!\n");
	return -1;
    }

    return 0;
}


char *read_fromdatabase(char *buf, int d, int com, int new_id, int old_id)
{
    int db_id = 0;
    int i, db_num, current, equal;

    if (com == SEND) {
	db_id = new_id;
	sort_newmail_database(db_id);
    } else if (com == RECEIVE) {
	db_id = old_id;
	sort_oldmail_database(db_id);
    }

    db_num = db_get_record_number(db_id);

    for (i = 0, current = 0; i < db_num; i++) {
	db_change_current_pos(db_id, i);
	db_get_current_pos(db_id, buf);

	if (com == SEND)
	    equal = strcmp(((struct new_email *) buf)->user, USERNAME);
	else
	    equal = strcmp(((struct new_rvmail *) buf)->user, USERNAME);
	if (!equal) {
	    current++;
	}
	if (current == d) {
	    return buf;
	}
    }
    return NULL;
}


/******************************************************************
cp add 2001.7.5
when AP closed in accident ,this function can show 
the email save in database
******************************************************************/

char *tran(char *p, int n)
{
    int i, len;

    if (p == NULL) {
	return buffer;
    }

    len = strlen(p);

    if (len < n - 2) {
	snprintf(buffer, 20, p);
	for (i = len; i < n - 1; i++)
	    buffer[i] = ' ';
	buffer[i] = '\0';
    } else {
	for (i = 0; i < n - 4; i++)
	    buffer[i] = *p++;
	for (; i < n - 1; i++)
	    buffer[i] = '.';
	buffer[i] = '\0';
    }
    return buffer;
}


char *format(char *p0, char *p1, char *p2)
{
    char br[3][32];

    snprintf(br[0], 32, tran(p0, 13));
    snprintf(br[1], 32, tran(p1, 13));
    snprintf(br[2], 32, tran(p2, 14));

    snprintf(tempbuf, 100, "%s    %s    %s", br[0], br[1], br[2]);
    return tempbuf;
}


int get_mail_fdb(int NS, int db_id)
{
    int i;
    char *buf = NULL;
    int db_num, current;

    if ((db_num = db_get_record_number(db_id)) == -1) {
	printf("get record number error!\n");
	return -1;
    }

    printf("there is %d mails\n", db_num);

    if (NS == RECVMAIL) {
	sort_oldmail_database(db_id);
	buf = (char *) malloc(MAXRCVMAIL);

	for (i = 0, current = 0; i < db_num; i++) {
	    if (db_search_key(db_id, &i, buf, sizeof(int)) == 0) {
		printf("search the record error!\n");
		return -1;
	    }

	    if (!strcmp(USERNAME, ((RCV *) buf)->user)) {
		current++;
		Rm_browser->insert(current, format(((RCV *) buf)->sender,
						   ((RCV *) buf)->date,
						   ((RCV *) buf)->
						   subject));
		Rm_browser->redraw();
	    }
	}
    } else {
	sort_newmail_database(db_id);
	buf = (char *) malloc(MAXNEWMAIL);

	for (i = 0, current = 0; i < db_num; i++) {
	    if (db_search_key(db_id, &i, buf, sizeof(int)) == 0) {
		printf("search the record error!\n");
		return -1;
	    }

	    if (!strcmp(USERNAME, ((NEW *) buf)->user)) {
		current++;
		Sm_browser->insert(current, format(((NEW *) buf)->from,
						   ((NEW *) buf)->to,
						   ((NEW *) buf)->
						   subject));
		Sm_browser->redraw();
	    }
	}
    }

    free(buf);

    return 0;
}


int get_the_datanum(int db_id)
{
    int db_num;

    if ((db_num = db_get_record_number(db_id)) == -1) {

	printf("get the datanum error!\n");
	return -1;
    } else
	return db_num;
}