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Annotation of 40BSD/cmd/users.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)users.c     4.1 (Berkeley) 10/1/80";
        !             2: /*
        !             3:  * users
        !             4:  */
        !             5: char   *malloc();
        !             6: 
        !             7: #include <stdio.h>
        !             8: #include <utmp.h>
        !             9: 
        !            10: #define NMAX sizeof(utmp.ut_name)
        !            11: #define LMAX sizeof(utmp.ut_line)
        !            12: 
        !            13: struct utmp utmp;
        !            14: 
        !            15: main(argc, argv)
        !            16: char **argv;
        !            17: {
        !            18:        register char *tp, *s;
        !            19:        register FILE *fi;
        !            20: 
        !            21:        s = "/etc/utmp";
        !            22:        if(argc == 2)
        !            23:                s = argv[1];
        !            24:        if ((fi = fopen(s, "r")) == NULL) {
        !            25:                puts("who: cannot open utmp");
        !            26:                exit(1);
        !            27:        }
        !            28:        while (fread((char *)&utmp, sizeof(utmp), 1, fi) == 1) {
        !            29:                if(utmp.ut_name[0] == '\0')
        !            30:                        continue;
        !            31:                putline();
        !            32:        }
        !            33:        summary();
        !            34: }
        !            35: 
        !            36: char   *names[128];
        !            37: char   **namp = names;
        !            38: putline()
        !            39: {
        !            40:        char temp[NMAX+1];
        !            41:        strncpy(temp, utmp.ut_name, NMAX);
        !            42:        temp[NMAX] = 0;
        !            43:        *namp = malloc(strlen(temp) + 1);
        !            44:        strcpy(*namp++, temp);
        !            45: }
        !            46: 
        !            47: scmp(p, q)
        !            48: char **p, **q;
        !            49: {
        !            50:        return(strcmp(*p, *q));
        !            51: }
        !            52: summary()
        !            53: {
        !            54:        register char **p;
        !            55: 
        !            56:        qsort(names, namp - names, sizeof names[0], scmp);
        !            57:        for (p=names; p < namp; p++) {
        !            58:                if (p != names)
        !            59:                        printf(" ");
        !            60:                printf("%s", *p);
        !            61:        }
        !            62:        printf("\n");
        !            63: }

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