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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1988, 1990 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: char copyright[] =
        !            20: "@(#) Copyright (c) 1988 Regents of the University of California.\n\
        !            21:  All rights reserved.\n";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #ifndef lint
        !            25: static char sccsid[] = "@(#)wall.c     5.12 (Berkeley) 6/29/90";
        !            26: #endif /* not lint */
        !            27: 
        !            28: /*
        !            29:  * This program is not related to David Wall, whose Stanford Ph.D. thesis
        !            30:  * is entitled "Mechanisms for Broadcast and Selective Broadcast".
        !            31:  */
        !            32: 
        !            33: #include <sys/param.h>
        !            34: #include <sys/stat.h>
        !            35: #include <sys/time.h>
        !            36: #include <sys/uio.h>
        !            37: #include <utmp.h>
        !            38: #include <pwd.h>
        !            39: #include <stdio.h>
        !            40: #include <paths.h>
        !            41: 
        !            42: #define        IGNOREUSER      "sleeper"
        !            43: 
        !            44: int nobanner;
        !            45: int mbufsize;
        !            46: char *mbuf;
        !            47: 
        !            48: /* ARGSUSED */
        !            49: main(argc, argv)
        !            50:        int argc;
        !            51:        char **argv;
        !            52: {
        !            53:        extern int optind;
        !            54:        int ch;
        !            55:        struct iovec iov;
        !            56:        struct utmp utmp;
        !            57:        FILE *fp;
        !            58:        char *p, *ttymsg();
        !            59: 
        !            60:        while ((ch = getopt(argc, argv, "n")) != EOF)
        !            61:                switch (ch) {
        !            62:                case 'n':
        !            63:                        /* undoc option for shutdown: suppress banner */
        !            64:                        if (geteuid() == 0)
        !            65:                                nobanner = 1;
        !            66:                        break;
        !            67:                case '?':
        !            68:                default:
        !            69: usage:
        !            70:                        (void)fprintf(stderr, "usage: wall [file]\n");
        !            71:                        exit(1);
        !            72:                }
        !            73:        argc -= optind;
        !            74:        argv += optind;
        !            75:        if (argc > 1)
        !            76:                goto usage;
        !            77: 
        !            78:        makemsg(*argv);
        !            79: 
        !            80:        if (!(fp = fopen(_PATH_UTMP, "r"))) {
        !            81:                (void)fprintf(stderr, "wall: cannot read %s.\n", _PATH_UTMP);
        !            82:                exit(1);
        !            83:        }
        !            84:        iov.iov_base = mbuf;
        !            85:        iov.iov_len = mbufsize;
        !            86:        /* NOSTRICT */
        !            87:        while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) {
        !            88:                if (!utmp.ut_name[0] ||
        !            89:                    !strncmp(utmp.ut_name, IGNOREUSER, sizeof(utmp.ut_name)))
        !            90:                        continue;
        !            91:                if (p = ttymsg(&iov, 1, utmp.ut_line))
        !            92:                        (void)fprintf(stderr, "wall: %s\n", p);
        !            93:        }
        !            94:        exit(0);
        !            95: }
        !            96: 
        !            97: makemsg(fname)
        !            98:        char *fname;
        !            99: {
        !           100:        register int ch, cnt;
        !           101:        struct tm *lt;
        !           102:        struct passwd *pw, *getpwuid();
        !           103:        struct stat sbuf;
        !           104:        time_t now, time();
        !           105:        FILE *fp;
        !           106:        int fd;
        !           107:        char *p, *whom, hostname[MAXHOSTNAMELEN], lbuf[100], tmpname[15];
        !           108:        char *getlogin(), *malloc(), *strcpy(), *ttyname();
        !           109: 
        !           110:        (void)strcpy(tmpname, _PATH_TMP);
        !           111:        (void)strcat(tmpname, "/wall.XXXXXX");
        !           112:        if (!(fd = mkstemp(tmpname)) || !(fp = fdopen(fd, "r+"))) {
        !           113:                (void)fprintf(stderr, "wall: can't open temporary file.\n");
        !           114:                exit(1);
        !           115:        }
        !           116:        (void)unlink(tmpname);
        !           117: 
        !           118:        if (!nobanner) {
        !           119:                if (!(whom = getlogin()))
        !           120:                        whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
        !           121:                (void)gethostname(hostname, sizeof(hostname));
        !           122:                (void)time(&now);
        !           123:                lt = localtime(&now);
        !           124: 
        !           125:                /*
        !           126:                 * all this stuff is to blank out a square for the message;
        !           127:                 * we wrap message lines at column 79, not 80, because some
        !           128:                 * terminals wrap after 79, some do not, and we can't tell.
        !           129:                 * Which means that we may leave a non-blank character
        !           130:                 * in column 80, but that can't be helped.
        !           131:                 */
        !           132:                (void)fprintf(fp, "\r%79s\r\n", " ");
        !           133:                (void)sprintf(lbuf, "Broadcast Message from %s@%s",
        !           134:                    whom, hostname);
        !           135:                (void)fprintf(fp, "%-79.79s\007\007\r\n", lbuf);
        !           136:                (void)sprintf(lbuf, "        (%s) at %d:%02d ...", ttyname(2),
        !           137:                    lt->tm_hour, lt->tm_min);
        !           138:                (void)fprintf(fp, "%-79.79s\r\n", lbuf);
        !           139:        }
        !           140:        (void)fprintf(fp, "%79s\r\n", " ");
        !           141: 
        !           142:        if (*fname && !(freopen(fname, "r", stdin))) {
        !           143:                (void)fprintf(stderr, "wall: can't read %s.\n", fname);
        !           144:                exit(1);
        !           145:        }
        !           146:        while (fgets(lbuf, sizeof(lbuf), stdin))
        !           147:                for (cnt = 0, p = lbuf; ch = *p; ++p, ++cnt) {
        !           148:                        if (cnt == 79 || ch == '\n') {
        !           149:                                for (; cnt < 79; ++cnt)
        !           150:                                        putc(' ', fp);
        !           151:                                putc('\r', fp);
        !           152:                                putc('\n', fp);
        !           153:                                cnt = 0;
        !           154:                        } else
        !           155:                                putc(ch, fp);
        !           156:                }
        !           157:        (void)fprintf(fp, "%79s\r\n", " ");
        !           158:        rewind(fp);
        !           159: 
        !           160:        if (fstat(fd, &sbuf)) {
        !           161:                (void)fprintf(stderr, "wall: can't stat temporary file.\n");
        !           162:                exit(1);
        !           163:        }
        !           164:        mbufsize = sbuf.st_size;
        !           165:        if (!(mbuf = malloc((u_int)mbufsize))) {
        !           166:                (void)fprintf(stderr, "wall: out of memory.\n");
        !           167:                exit(1);
        !           168:        }
        !           169:        if (fread(mbuf, sizeof(*mbuf), mbufsize, fp) != mbufsize) {
        !           170:                (void)fprintf(stderr, "wall: can't read temporary file.\n");
        !           171:                exit(1);
        !           172:        }
        !           173:        (void)close(fd);
        !           174: }

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