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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 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: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)lastcomm.c 5.11 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: /*
        !            31:  * last command
        !            32:  */
        !            33: #include <sys/param.h>
        !            34: #include <sys/acct.h>
        !            35: #include <sys/file.h>
        !            36: #include <sys/stat.h>
        !            37: #include <utmp.h>
        !            38: #include <struct.h>
        !            39: #include <ctype.h>
        !            40: #include <stdio.h>
        !            41: #include "pathnames.h"
        !            42: 
        !            43: struct acct buf[DEV_BSIZE / sizeof (struct acct)];
        !            44: 
        !            45: time_t expand();
        !            46: char   *flagbits();
        !            47: char   *getdev();
        !            48: 
        !            49: main(argc, argv)
        !            50:        int argc;
        !            51:        char *argv[];
        !            52: {
        !            53:        extern int optind;
        !            54:        extern char *optarg;
        !            55:        register struct acct *acp;
        !            56:        register int bn, cc;
        !            57:        struct stat sb;
        !            58:        int ch, fd;
        !            59:        char *acctfile, *ctime(), *strcpy(), *user_from_uid();
        !            60:        long lseek();
        !            61: 
        !            62:        acctfile = _PATH_ACCT;
        !            63:        while ((ch = getopt(argc, argv, "f:")) != EOF)
        !            64:                switch((char)ch) {
        !            65:                case 'f':
        !            66:                        acctfile = optarg;
        !            67:                        break;
        !            68:                case '?':
        !            69:                default:
        !            70:                        fputs("lastcomm [ -f file ]\n", stderr);
        !            71:                        exit(1);
        !            72:                }
        !            73:        argv += optind;
        !            74: 
        !            75:        fd = open(acctfile, O_RDONLY);
        !            76:        if (fd < 0) {
        !            77:                perror(acctfile);
        !            78:                exit(1);
        !            79:        }
        !            80:        (void)fstat(fd, &sb);
        !            81:        setpassent(1);
        !            82:        for (bn = btodb(sb.st_size); bn >= 0; bn--) {
        !            83:                (void)lseek(fd, (off_t)dbtob(bn), L_SET);
        !            84:                cc = read(fd, buf, DEV_BSIZE);
        !            85:                if (cc < 0) {
        !            86:                        perror("read");
        !            87:                        break;
        !            88:                }
        !            89:                acp = buf + (cc / sizeof (buf[0])) - 1;
        !            90:                for (; acp >= buf; acp--) {
        !            91:                        register char *cp;
        !            92:                        time_t x;
        !            93: 
        !            94:                        if (acp->ac_comm[0] == '\0')
        !            95:                                (void)strcpy(acp->ac_comm, "?");
        !            96:                        for (cp = &acp->ac_comm[0];
        !            97:                             cp < &acp->ac_comm[fldsiz(acct, ac_comm)] && *cp;
        !            98:                             cp++)
        !            99:                                if (!isascii(*cp) || iscntrl(*cp))
        !           100:                                        *cp = '?';
        !           101:                        if (*argv && !ok(argv, acp))
        !           102:                                continue;
        !           103:                        x = expand(acp->ac_utime) + expand(acp->ac_stime);
        !           104:                        printf("%-*.*s %s %-*s %-*s %6.2f secs %.16s\n",
        !           105:                                fldsiz(acct, ac_comm), fldsiz(acct, ac_comm),
        !           106:                                acp->ac_comm, flagbits(acp->ac_flag),
        !           107:                                UT_NAMESIZE, user_from_uid(acp->ac_uid, 0),
        !           108:                                UT_LINESIZE, getdev(acp->ac_tty),
        !           109:                                x / (double)AHZ, ctime(&acp->ac_btime));
        !           110:                }
        !           111:        }
        !           112: }
        !           113: 
        !           114: time_t
        !           115: expand (t)
        !           116:        unsigned t;
        !           117: {
        !           118:        register time_t nt;
        !           119: 
        !           120:        nt = t & 017777;
        !           121:        t >>= 13;
        !           122:        while (t) {
        !           123:                t--;
        !           124:                nt <<= 3;
        !           125:        }
        !           126:        return (nt);
        !           127: }
        !           128: 
        !           129: char *
        !           130: flagbits(f)
        !           131:        register int f;
        !           132: {
        !           133:        static char flags[20];
        !           134:        char *p, *strcpy();
        !           135: 
        !           136: #define        BIT(flag, ch)   if (f & flag) *p++ = ch;
        !           137:        p = strcpy(flags, "-    ");
        !           138:        BIT(ASU, 'S');
        !           139:        BIT(AFORK, 'F');
        !           140:        BIT(ACOMPAT, 'C');
        !           141:        BIT(ACORE, 'D');
        !           142:        BIT(AXSIG, 'X');
        !           143:        return (flags);
        !           144: }
        !           145: 
        !           146: ok(argv, acp)
        !           147:        register char *argv[];
        !           148:        register struct acct *acp;
        !           149: {
        !           150:        register char *cp;
        !           151:        char *user_from_uid();
        !           152: 
        !           153:        do {
        !           154:                cp = user_from_uid(acp->ac_uid, 0);
        !           155:                if (!strcmp(cp, *argv)) 
        !           156:                        return(1);
        !           157:                if ((cp = getdev(acp->ac_tty)) && !strcmp(cp, *argv))
        !           158:                        return(1);
        !           159:                if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
        !           160:                        return(1);
        !           161:        } while (*++argv);
        !           162:        return(0);
        !           163: }
        !           164: 
        !           165: #include <sys/dir.h>
        !           166: 
        !           167: #define N_DEVS         43              /* hash value for device names */
        !           168: #define NDEVS          500             /* max number of file names in /dev */
        !           169: 
        !           170: struct devhash {
        !           171:        dev_t   dev_dev;
        !           172:        char    dev_name [UT_LINESIZE + 1];
        !           173:        struct  devhash * dev_nxt;
        !           174: };
        !           175: struct devhash *dev_hash[N_DEVS];
        !           176: struct devhash *dev_chain;
        !           177: #define HASH(d)        (((int) d) % N_DEVS)
        !           178: 
        !           179: setupdevs()
        !           180: {
        !           181:        register DIR * fd;
        !           182:        register struct devhash * hashtab;
        !           183:        register ndevs = NDEVS;
        !           184:        struct direct * dp;
        !           185:        char *malloc();
        !           186: 
        !           187:        /*NOSTRICT*/
        !           188:        hashtab = (struct devhash *)malloc(NDEVS * sizeof(struct devhash));
        !           189:        if (hashtab == (struct devhash *)0) {
        !           190:                fputs("No mem for dev table\n", stderr);
        !           191:                return;
        !           192:        }
        !           193:        if ((fd = opendir(_PATH_DEV)) == NULL) {
        !           194:                perror(_PATH_DEV);
        !           195:                return;
        !           196:        }
        !           197:        while (dp = readdir(fd)) {
        !           198:                if (dp->d_ino == 0)
        !           199:                        continue;
        !           200:                if (dp->d_name[0] != 't' && strcmp(dp->d_name, "console"))
        !           201:                        continue;
        !           202:                (void)strncpy(hashtab->dev_name, dp->d_name, UT_LINESIZE);
        !           203:                hashtab->dev_name[UT_LINESIZE] = 0;
        !           204:                hashtab->dev_nxt = dev_chain;
        !           205:                dev_chain = hashtab;
        !           206:                hashtab++;
        !           207:                if (--ndevs <= 0)
        !           208:                        break;
        !           209:        }
        !           210:        closedir(fd);
        !           211: }
        !           212: 
        !           213: char *
        !           214: getdev(dev)
        !           215:        dev_t dev;
        !           216: {
        !           217:        register struct devhash *hp, *nhp;
        !           218:        struct stat statb;
        !           219:        char name[fldsiz(devhash, dev_name) + 6];
        !           220:        static dev_t lastdev = (dev_t) -1;
        !           221:        static char *lastname;
        !           222:        static int init = 0;
        !           223:        char *strcpy(), *strcat();
        !           224: 
        !           225:        if (dev == NODEV)
        !           226:                return ("__");
        !           227:        if (dev == lastdev)
        !           228:                return (lastname);
        !           229:        if (!init) {
        !           230:                setupdevs();
        !           231:                init++;
        !           232:        }
        !           233:        for (hp = dev_hash[HASH(dev)]; hp; hp = hp->dev_nxt)
        !           234:                if (hp->dev_dev == dev) {
        !           235:                        lastdev = dev;
        !           236:                        return (lastname = hp->dev_name);
        !           237:                }
        !           238:        for (hp = dev_chain; hp; hp = nhp) {
        !           239:                nhp = hp->dev_nxt;
        !           240:                (void)strcpy(name, _PATH_DEV);
        !           241:                strcat(name, hp->dev_name);
        !           242:                if (stat(name, &statb) < 0)     /* name truncated usually */
        !           243:                        continue;
        !           244:                if ((statb.st_mode & S_IFMT) != S_IFCHR)
        !           245:                        continue;
        !           246:                hp->dev_dev = statb.st_rdev;
        !           247:                hp->dev_nxt = dev_hash[HASH(hp->dev_dev)];
        !           248:                dev_hash[HASH(hp->dev_dev)] = hp;
        !           249:                if (hp->dev_dev == dev) {
        !           250:                        dev_chain = nhp;
        !           251:                        lastdev = dev;
        !           252:                        return (lastname = hp->dev_name);
        !           253:                }
        !           254:        }
        !           255:        dev_chain = (struct devhash *) 0;
        !           256:        return ("??");
        !           257: }

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