Fresh Fish 5/FreshFish_July-August1994.bin/bbs/util/llp-1.0.lha/LLP-1.0/LOUT.C

C/C++ Source or Header | 1994-05-17 | 5.1 KB | 180 lines

//---------------------------------------------------------------------------
// LOGOUT                                        (c) Laurence Vanhelsuwe 1994
// ------
// This program is part of a group of 3 complimentary programs to log the
// usage of a stand-alone machine. (LOGIN, LOGOUT, PASSWORD)
//
// This program has been written in ANSI C to make it fully portable across
// different hardware platforms.
//
// Original development and testing was carried out on a Commodore Amiga 3000.
//
// History
// -------
// 01-JAN-94: Design and initial file creation.
//
//
//---------------------------------------------------------------------------

//#define        DEBUG            1

#include    "stdio.h"
#include    "stdlib.h"
#include    "string.h"
#include    "fcntl.h"
#include    "time.h"

#define        MAX_NAME_LEN    (10)
#define        ENTRY_LEN        (65)

#ifdef    AMIGA
#define        LFILE            "DEVS:USERLOG.DAT"
#define        PFILE            "DEVS:PASSWORDS.DAT"
#define        HELP            "?"
#define        OPEN_MODE        (O_RDWR)

#else

#define        LFILE            "C:/DOS/USERLOG.DAT"
#define        PFILE            "C:/DOS/PASSWOR.DAT"
#define        HELP            "/?"
#define        OPEN_MODE        (O_RDWR | O_BINARY)

#endif

//---------------------------------------------------------------------------
// Function Prototypes
// -------------------
//---------------------------------------------------------------------------

void get_log_entry(void);
void change_log_entry(void);

//---------------------------------------------------------------------------
// Globals
// -------
//---------------------------------------------------------------------------

char *entry_buffer="X AAAAAAAAAA DDD MMM dd hh:mm:ss YYYY - DDD MMM dd hh:mm:ss YYYY\r";
char name[MAX_NAME_LEN+2];

long int file_size, log_pos;
int error, num_entries;

int logfile, passwfile;            // LEVEL 1 ANSI C File Handles

time_t    systime;
struct tm *tim;

//---------------------------------------------------------------------------
//---------------------------------------------------------------------------

main(int argc, char **argv) {

char *ptr, ch;
int len;

    if(argc > 1 ) {
        printf("LOGIN V1.0  (Copyright (c) Jan 1994 L. Vanhelsuwe)\n\n");
        printf("Programmed by Laurence Vanhelsuwe in C on an Amiga 3000.\n");
        printf("Ported to IBM PC environment by L. Vanhelsuwe.\n\n");
        printf("USAGE: LOGOUT [%s]\n\n", HELP);
    }

    if ((passwfile = open(PFILE, OPEN_MODE)) == -1L) {
        fprintf(stderr, "Passwords file does not exist !\n");
        exit(10);
    }
    close(passwfile);

    if ((  logfile = open(LFILE, OPEN_MODE)) == -1L) {
        fprintf(stderr, "Log file does not exist !\n");
        exit(10);
    }

    get_log_entry();                    // get last log entry in entry_buffer

    if (entry_buffer[0] == 'I') {
        entry_buffer[0]  = 'O';            // set entry to correctly logged off

        time(&systime);                        // get machine local time
        tim = localtime(&systime);            // convert to universal time format
        strncpy(&entry_buffer[40], asctime(tim), 24);    // copy to log file line

        ptr = &entry_buffer[3];            // find length of user's name
        len = 1;
        while (len < MAX_NAME_LEN) {
            if (*ptr++ != ' ') len++;
            else break;
        }

        strncpy(name, &entry_buffer[2], len);    // maximum MAX_NAME_LEN chars

        printf("\n");
        printf("User '%s' Logging out...\n\n", name);

        printf("Session duration:\n");    ch = entry_buffer[37]; entry_buffer[37]=0;
        printf("LOGIN  : %s\n", &entry_buffer[13]);
        printf("LOGOUT : %s\n", &entry_buffer[40]);
        printf("\n"); entry_buffer[37] = ch;

        change_log_entry();

    } else {
        printf("\n");
        printf("  -- WARNING --\n\n");
        printf("No user currently logged in ! (Please use LOGIN)\n");
    }
}

//---------------------------------------------------------------------------
// Seek to the last entry and read it in our fixed buffer.
//---------------------------------------------------------------------------
void get_log_entry(void) {
int chars,i;

    lseek(logfile, 0L, SEEK_END); file_size = tell(logfile);

    num_entries = file_size/ENTRY_LEN;
    log_pos = (num_entries-1)*ENTRY_LEN;

#ifdef DEBUG
    printf("File size = %ld, Num Entries = %d, LOG Position = %d, ENTRY_LEN = %d\n",
             file_size, num_entries, log_pos, ENTRY_LEN);
#endif

    lseek(logfile, log_pos, SEEK_SET);
    chars = read (logfile, (void*) entry_buffer, ENTRY_LEN);

#ifdef DEBUG
    for (i=0; i< 16; i++)
    printf("buf[i] = '%c'    buf[i+16] = '%c'    buf[i+32] = '%c'    buf[i+48] = '%c'\n",
     entry_buffer[i],
     entry_buffer[i+16],
     entry_buffer[i+32],
     entry_buffer[i+48]);
    printf("BUF[64]='%c'    BUF[65]='%c'\n", entry_buffer[64], entry_buffer[65]);

    if (chars != ENTRY_LEN) {
        printf("ERROR: get_log_entry() read didn't read %d chars (but %d!)\n", ENTRY_LEN, chars);
        exit(10);
    }
#endif

    entry_buffer[12] = 0;            // zero-terminate user field
}
//---------------------------------------------------------------------------
// Seek back to the start of the last entry and overwrite it with the updated
// log entry.
//---------------------------------------------------------------------------
void change_log_entry(void) {

    entry_buffer[12] = ' ';            // restore space after name

    lseek(logfile, log_pos, SEEK_SET);
    write(logfile, (void*) entry_buffer, ENTRY_LEN);
    close(logfile);
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------