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Annotation of 43BSDReno/usr.bin/who/who.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * Michael Fischbein.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #ifndef lint
        !            24: char copyright[] =
        !            25: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
        !            26:  All rights reserved.\n";
        !            27: #endif /* not lint */
        !            28: 
        !            29: #ifndef lint
        !            30: static char sccsid[] = "@(#)who.c      5.11 (Berkeley) 6/1/90";
        !            31: #endif /* not lint */
        !            32: 
        !            33: #include <sys/types.h>
        !            34: #include <sys/file.h>
        !            35: #include <sys/time.h>
        !            36: #include <pwd.h>
        !            37: #include <utmp.h>
        !            38: #include <stdio.h>
        !            39: 
        !            40: main(argc, argv)
        !            41:        int argc;
        !            42:        char **argv;
        !            43: {
        !            44:        register char *p;
        !            45:        struct utmp usr;
        !            46:        struct passwd *pw;
        !            47:        FILE *ufp, *file();
        !            48:        char *t, *rindex(), *strcpy(), *strncpy(), *ttyname();
        !            49:        time_t time();
        !            50: 
        !            51:        switch (argc) {
        !            52:        case 1:                                 /* who */
        !            53:                ufp = file(_PATH_UTMP);
        !            54:                /* only entries with both name and line fields */
        !            55:                while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
        !            56:                        if (*usr.ut_name && *usr.ut_line)
        !            57:                                output(&usr);
        !            58:                break;
        !            59:        case 2:                                 /* who utmp_file */
        !            60:                ufp = file(argv[1]);
        !            61:                /* all entries */
        !            62:                while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
        !            63:                        output(&usr);
        !            64:                break;
        !            65:        case 3:                                 /* who am i */
        !            66:                ufp = file(_PATH_UTMP);
        !            67: 
        !            68:                /* search through the utmp and find an entry for this tty */
        !            69:                if (p = ttyname(0)) {
        !            70:                        /* strip any directory component */
        !            71:                        if (t = rindex(p, '/'))
        !            72:                                p = t + 1;
        !            73:                        while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1)
        !            74:                                if (usr.ut_name && !strcmp(usr.ut_line, p)) {
        !            75:                                        output(&usr);
        !            76:                                        exit(0);
        !            77:                                }
        !            78:                        /* well, at least we know what the tty is */
        !            79:                        (void)strncpy(usr.ut_line, p, UT_LINESIZE);
        !            80:                } else
        !            81:                        (void)strcpy(usr.ut_line, "tty??");
        !            82:                pw = getpwuid(getuid());
        !            83:                (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE);
        !            84:                (void)time(&usr.ut_time);
        !            85:                *usr.ut_host = '\0';
        !            86:                output(&usr);
        !            87:                break;
        !            88:        default:
        !            89:                (void)fprintf(stderr, "usage: who [ file ]\n       who am i\n");
        !            90:                exit(1);
        !            91:        }
        !            92:        exit(0);
        !            93: }
        !            94: 
        !            95: output(up)
        !            96:        struct utmp *up;
        !            97: {
        !            98:        char *ctime();
        !            99: 
        !           100:        (void)printf("%-*.*s %-*.*s", UT_NAMESIZE, UT_NAMESIZE, up->ut_name,
        !           101:            UT_LINESIZE, UT_LINESIZE, up->ut_line);
        !           102:        (void)printf("%.12s", ctime(&up->ut_time) + 4);
        !           103:        if (*up->ut_host)
        !           104:                printf("\t(%.*s)", UT_HOSTSIZE, up->ut_host);
        !           105:        (void)putchar('\n');
        !           106: }
        !           107: 
        !           108: FILE *
        !           109: file(name)
        !           110:        char *name;
        !           111: {
        !           112:        extern int errno;
        !           113:        FILE *ufp;
        !           114:        char *strerror();
        !           115: 
        !           116:        if (!(ufp = fopen(name, "r"))) {
        !           117:                (void)fprintf(stderr, "who: %s: %s.\n", name, strerror(errno));
        !           118:                exit(1);
        !           119:        }
        !           120:        return(ufp);
        !           121: }

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