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    Length: 2195 (0x893)
    Types: TextFile
    Names: »backup.c«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─ ⟦this⟧ »EUUGD11/euug-87hel/sec8/mcp/src/backup.c« 

TextFile

/**************************************************************************\
* 									   *
* 	backup.c							   *
* 									   *
* Before the account files are modified mcp back them up.  THe files are   *
* backed up only once per mcp session; if you save-changes more than once  *
* the backups will still contain the files as they were when the mcp	   *
* session started, NOT the result of the last save-changes.		   *
* 									   *
\**************************************************************************/

#include <sys/file.h>
#include <stdio.h>
#include "sysdep.h"
#include "mem.h"
#include "save.h"

static	int BackedUp = 0;
extern	char *sprintf();

/*
 * Will only backup one file per call!  Don't pass all of ModBits to this
 * routine at once.
 */
backup(flag)
int flag;

{
	char *old, *new;

	if (BackedUp & flag)
	    return 1;
	switch (flag) {
	case AC:
	    old = ACFILE;
	    new = ACBAK;
	    break;
#ifdef SENDMAIL
	case AL:
	    if (copyfile(ALBIND, ALBINDBAK) == 0)
		return 0;
	    old = ALIASFILE;
	    new = ALIASBAK;
	    break;
#endif
	case CS:
	    old = CSFILE;
	    new = CSBAK;
	    break;
	case GR:
	    old = GRPFILE;
	    new = GRPBAK;
	    break;
	case PW:
	    old = PWDFILE;
	    new = PWDBAK;
	    break;
	case RG:
	    old = RANGEFILE;
	    new = RANGEBAK;
	    break;
	case SG:
	    old = SIGFILE;
	    new = SIGBAK;
	    break;
	case VG:
	    old = VIGFILE;
	    new = VIGBAK;
	    break;
	default:
	    break;
	}
	if (copyfile(old, new) != 0) {
		BackedUp |= flag;
		return 1;
	}
	return 0;
}

copyfile(from, to)
char *from, *to;

{
	char buf[BUFSIZ+1];
	int n, fromfd, tofd;
	char errmsg[LONG_BUF];

	if ((fromfd = open(from, O_RDONLY)) < 0) {
	    perr(from);
	    err2("copy %s -> %s failed", from, to);
	    return 0;
	}
	if ((tofd = open(to, O_WRONLY | O_CREAT | O_TRUNC, 0666)) < 0) {
	    perr(from);
	    err2("copy %s -> %s failed", from, to);
	    return 0;
	}
	while ((n = read(fromfd, buf, BUFSIZ)) > 0)
	    if (write(tofd, buf, n) != n) {
		(void) sprintf(errmsg, "write of %d bytes to %s failed", n,
				to);
		perr(errmsg);
		err2("copy %s -> %s failed", from, to);
	    }
	(void) close(fromfd);
	(void) close(tofd);
	return 1;
}