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Annotation of 41BSD/libc/gen/ttyname.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * ttyname(f): return "/dev/ttyXX" which the the name of the
        !             3:  * tty belonging to file f.
        !             4:  *  NULL if it is not a tty
        !             5:  */
        !             6: 
        !             7: #define        NULL    0
        !             8: #include <sys/types.h>
        !             9: #include <sys/dir.h>
        !            10: #include <sys/stat.h>
        !            11: 
        !            12: static char    dev[]   = "/dev/";
        !            13: char   *strcpy();
        !            14: char   *strcat();
        !            15: 
        !            16: char *
        !            17: ttyname(f)
        !            18: {
        !            19:        struct stat fsb;
        !            20:        struct stat tsb;
        !            21:        struct direct db;
        !            22:        static char rbuf[32];
        !            23:        register df;
        !            24: 
        !            25:        if (isatty(f)==0)
        !            26:                return(NULL);
        !            27:        if (fstat(f, &fsb) < 0)
        !            28:                return(NULL);
        !            29:        if ((fsb.st_mode&S_IFMT) != S_IFCHR)
        !            30:                return(NULL);
        !            31:        if ((df = open(dev, 0)) < 0)
        !            32:                return(NULL);
        !            33:        while (read(df, (char *)&db, sizeof(db)) == sizeof(db)) {
        !            34:                if (db.d_ino == 0)
        !            35:                        continue;
        !            36:                if (db.d_ino != fsb.st_ino)
        !            37:                        continue;
        !            38:                strcpy(rbuf, dev);
        !            39:                strcat(rbuf, db.d_name);
        !            40:                if (stat(rbuf, &tsb) < 0)
        !            41:                        continue;
        !            42:                if (tsb.st_dev==fsb.st_dev && tsb.st_ino==fsb.st_ino) {
        !            43:                        close(df);
        !            44:                        return(rbuf);
        !            45:                }
        !            46:        }
        !            47:        close(df);
        !            48:        return(NULL);
        !            49: }

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