fetch.c

来自「用Ｃ语言编的邮件系统（毕业论文）」· C语言 代码 · 共 26 行

#include	"mail.h"

/* Fetch a specified record.
 * We return a pointer to the null-terminated data. */

char *
mail_fetch(MAIL *mail, struct message *msg)
{
	char	*ptr;

	if (_mail_find(mail,msg->messageid , 0) < 0) {
		ptr = NULL;
                printf("error in _mail_find()");				/* error, record not found */
		mail->cnt_fetcherr++;
	} else {
		ptr = _mail_readdat(mail);	/* return pointer to data */
		mail->cnt_fetchok++;
	}
			/* Unlock the hash chain that _mail_find() locked */
	if (un_lock(mail->idxfd, mail->chainoff, SEEK_SET, 1) < 0)
		err_dump("un_lock error");
	return(ptr);
}