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Annotation of 3BSD/cmd/ucbmail/ing.local.c, revision 1.1

1.1     ! root        1: #
        !             2: 
        !             3: /*
        !             4:  * Mail -- a mail program
        !             5:  *
        !             6:  * Ingres 11/70.  Unix version 6.0
        !             7:  *
        !             8:  * Local routines that are installation dependent.
        !             9:  * All fiddlers please note:  if you make careful note of
        !            10:  * what you change here, I will incorporate your changes and
        !            11:  * you won't have to remake them each release.
        !            12:  */
        !            13: 
        !            14: #include "rcv.h"
        !            15: #include       <errno.h>
        !            16: 
        !            17: /*
        !            18:  * Locate the user's mailbox file (ie, the place where new, unread
        !            19:  * mail is queued).  At Ingres, it's in /usr/spool/mail/loginname.
        !            20:  */
        !            21: 
        !            22: findmail()
        !            23: {
        !            24:        register char *cp;
        !            25: 
        !            26:        cp = copy("/usr/spool/mail/", mailname);
        !            27:        copy(myname, cp);
        !            28: }
        !            29: 
        !            30: /*
        !            31:  * Get rid of the queued mail.
        !            32:  */
        !            33: 
        !            34: demail()
        !            35: {
        !            36:        if (unlink(mailname) >= 0)
        !            37:                return;
        !            38:        close(creat(mailname, 0666));
        !            39:        alter(mailname);
        !            40: }
        !            41: 
        !            42: /*
        !            43:  * Get an environment variable.  At present, we only support
        !            44:  * "SHELL" and "HOME".  This routine makes use of the getpw
        !            45:  * routine in the neighboring getname.c stuff.
        !            46:  */
        !            47: 
        !            48: char *
        !            49: getenv(name)
        !            50:        char name[];
        !            51: {
        !            52:        char pwline[LINESIZE];
        !            53:        static char val[30];
        !            54:        register char *cp, *dp;
        !            55:        register int cc;
        !            56: 
        !            57:        if (equal(name, "SHELL"))
        !            58:                cc = 6;
        !            59:        else if (equal(name, "HOME"))
        !            60:                cc = 5;
        !            61:        else
        !            62:                return(NOSTR);
        !            63:        if (getpwnam(myname, pwline) < 0)
        !            64:                return(NOSTR);
        !            65:        for (cp = pwline; *cp && cc > 0;)
        !            66:                if (*cp++ == ':')
        !            67:                        cc--;
        !            68:        dp = cp;
        !            69:        while (*cp != ':' && *cp != '\0' && *cp != '\n')
        !            70:                cp++;
        !            71:        *cp = '\0';
        !            72:        if (*dp == '\0')
        !            73:                return(NOSTR);
        !            74:        copy(dp, val);
        !            75:        return(val);
        !            76: }
        !            77: 
        !            78: /*
        !            79:  * Discover user name.  On Ingres, user names are rarely 1-1 with uids,
        !            80:  * so we look for this guy in the utmp file first, then try finding
        !            81:  * him in the passwd file on basis of uid if that fails.
        !            82:  */
        !            83: 
        !            84: struct utmp {
        !            85:        char    u_name[8];              /* User login name. */
        !            86:        char    u_tty;                  /* typewriter character */
        !            87:        char    u_cfill;                /* Unused for now. */
        !            88:        long    u_time;                 /* Login time */
        !            89:        short   u_wfill;                /* Unused also */
        !            90: };
        !            91: 
        !            92: username(uid, namebuf)
        !            93:        char namebuf[];
        !            94: {
        !            95:        struct utmp ubuf;
        !            96:        register char *cp;
        !            97:        register int tty;
        !            98:        register FILE *fwho;
        !            99: 
        !           100:        tty = ttyn(0);
        !           101:        if (tty == 'x')
        !           102:                goto useuid;
        !           103:        
        !           104:        /*
        !           105:         * Dammit, I really do have to search the utmp file!
        !           106:         */
        !           107: 
        !           108:        if ((fwho = fopen("/etc/utmp", "r")) == NULL)
        !           109:                goto useuid;
        !           110:        while (fread(&ubuf, 1, sizeof ubuf, fwho) > 0)
        !           111:                if (ubuf.u_tty == tty) {
        !           112:                        strncpy(namebuf, ubuf.u_name, 8);
        !           113:                        namebuf[8] = 0;
        !           114:                        cp = index(namebuf, ' ');
        !           115:                        if (cp != NOSTR)
        !           116:                                *cp = 0;
        !           117:                        return(0);
        !           118:                }
        !           119:        fclose(fwho);
        !           120: 
        !           121: useuid:
        !           122:        return(getname(uid, namebuf));
        !           123: }
        !           124: 
        !           125: /*
        !           126:  * Unix routine to do an "fopen" on file descriptor
        !           127:  * The mode has to be repeated because you can't query its
        !           128:  * status
        !           129:  */
        !           130: 
        !           131: FILE *
        !           132: fdopen(fd, mode)
        !           133: register char *mode;
        !           134: {
        !           135:        extern int errno;
        !           136:        register FILE *iop;
        !           137:        extern FILE *_lastbuf;
        !           138: 
        !           139:        for (iop = _iob; iop->_flag&(_IOREAD|_IOWRT); iop++)
        !           140:                if (iop >= _lastbuf)
        !           141:                        return(NULL);
        !           142:        iop->_cnt = 0;
        !           143:        iop->_file = fd;
        !           144:        if (*mode != 'r') {
        !           145:                iop->_flag |= _IOWRT;
        !           146:                if (*mode == 'a')
        !           147:                        lseek(fd, 0L, 2);
        !           148:        } else
        !           149:                iop->_flag |= _IOREAD;
        !           150:        return(iop);
        !           151: }
        !           152: 
        !           153: /*
        !           154:  * Copy s2 to s1, truncating or null-padding to always copy n bytes
        !           155:  * return s1
        !           156:  */
        !           157: 
        !           158: char *
        !           159: strncpy(s1, s2, n)
        !           160: register char *s1, *s2;
        !           161: {
        !           162:        register i;
        !           163:        register char *os1;
        !           164: 
        !           165:        os1 = s1;
        !           166:        for (i = 0; i < n; i++)
        !           167:                if ((*s1++ = *s2++) == '\0') {
        !           168:                        while (++i < n)
        !           169:                                *s1++ = '\0';
        !           170:                        return(os1);
        !           171:                }
        !           172:        return(os1);
        !           173: }

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