1/* getutline.c: A replacement for the getutline() function 2 3%%% copyright-cmetz-96 4This software is Copyright 1996-2001 by Craig Metz, All Rights Reserved. 5The Inner Net License Version 3 applies to this software. 6You should have received a copy of the license with this software. If 7you didn't get a copy, you may request one from <license@inner.net>. 8 9 History: 10 11 Modified by cmetz for OPIE 2.32. Fixed check for fread() return 12 value. 13 Modified by cmetz for OPIE 2.31. If the OS won't tell us where 14 _PATH_UTMP is, play the SVID game, then use 15 Autoconf-discovered values. 16 Created by cmetz for OPIE 2.3. 17*/ 18 19#include "opie_cfg.h" 20#include <stdio.h> 21#include <utmp.h> 22#include "opie.h" 23 24static struct utmp u; 25 26#ifndef _PATH_UTMP 27#ifdef UTMP_FILE 28#define _PATH_UTMP UTMP_FILE 29#else /* UTMP_FILE */ 30#define _PATH_UTMP PATH_UTMP_AC 31#endif /* UTMP_FILE */ 32#endif /* _PATH_UTMP */ 33 34struct utmp *getutline FUNCTION((utmp), struct utmp *utmp) 35{ 36 FILE *f; 37 int i; 38 39 if (!(f = __opieopen(_PATH_UTMP, 0, 0644))) 40 return 0; 41 42#if HAVE_TTYSLOT 43 if (i = ttyslot()) { 44 if (fseek(f, i * sizeof(struct utmp), SEEK_SET) < 0) 45 goto ret; 46 if (fread(&u, sizeof(struct utmp), 1, f) != 1) 47 goto ret; 48 fclose(f); 49 return &u; 50 } 51#endif /* HAVE_TTYSLOT */ 52 53 while(fread(&u, sizeof(struct utmp), 1, f) == 1) { 54 if (!strncmp(utmp->ut_line, u.ut_line, sizeof(u.ut_line) - 1)) { 55 fclose(f); 56 return &u; 57 } 58 } 59 60ret: 61 fclose(f); 62 return NULL; 63} 64