attachments.cpp.old

一个国外学生做的基于Web浏览器的email程序

#include "attachments.h"

void showattachment(char mailfile[], int mailnum, int attachnum)
{
	FILE * mailbox;
	char data[500];
	int count = 0;
	int attachcount = 0;
	char header[500];
	int attachfound = 0;
	passwd *info;


	mailbox = fopen(mailfile, "r");
	if (mailbox == NULL)
	{
		error("showattachment():can't open data for read.");
		return;
	}	
	if (bothlock(mailbox, 'r')!=0)
	{
		fclose(mailbox);
		error("showattachment():Error locking mailstore");
		return;		
	}
	info=getpwnam(globaluser);

	while (fgets(data, 500, mailbox) != NULL)
	{

		if (strncmp(data, "From ", 5)==0)
		{
			count++;
			if (count > mailnum)
				break;
		}
		if (count == mailnum) //email found
		{
			if (strncmp(data, "begin ", 6)==0) 		
			{ 
				attachcount++;
			}
			if (attachcount == attachnum)
			{
				snprintf(header, 500, "content-type: %s\n\n", guessmime(data));
				attachfound = 1;

				char uudecodepath[500];
				char attachpath[500];
				FILE *uuout;
				char rdata;  //attach data

				snprintf(uudecodepath, 500, "/usr/bin/uudecode -o %s/.webmail/uutmp", info->pw_dir);
				uuout = popen(uudecodepath, "w");
				if (uuout == NULL)
				{
					error("showattachment(): Error opening or piping to uudecode");
					return;
				}
				do
				{
					fputs(data, uuout);
					if (strncmp(data, "end", 3)==0)
					{
						attachcount++; //need to end
						break;
					}
				} while (fgets(data, 500, mailbox) !=NULL);
				pclose(uuout);

				snprintf(attachpath, 500,"%s/.webmail/uutmp", info->pw_dir);
		 		uuout = fopen(attachpath, "r");
			 	if (uuout == NULL) 		
				{
 	 		 		error("showattachment(): Error opening attachment");
	    		 	 	return;
	 	 	 	} 
	 			if (bothlock(uuout, 'r')!=0)
	 	 	 	{
			 		fclose(uuout); 			 	
					error("showattachment():Error locking tmpstore");
					return;
 				}
				cout << header;
 			 	while (fread(&rdata, 1, 1, uuout)>0)
 			 	{
					cout << rdata;
 				}
				bothunlock(uuout);
				fclose(uuout);
				remove(attachpath);
			}
		}
	}

	bothunlock(mailbox);
	fclose(mailbox);

	if (attachfound == 0)
	{
		error("showattachment(): No attachment found");
	}
}