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Annotation of 43BSD/lib/libc/gen/ttyname.c, revision 1.1

1.1     ! root        1: #if defined(LIBC_SCCS) && !defined(lint)
        !             2: static char sccsid[] = "@(#)ttyname.c  5.2 (Berkeley) 3/9/86";
        !             3: #endif LIBC_SCCS and not lint
        !             4: 
        !             5: /*
        !             6:  * ttyname(f): return "/dev/ttyXX" which the the name of the
        !             7:  * tty belonging to file f.
        !             8:  *  NULL if it is not a tty
        !             9:  */
        !            10: 
        !            11: #define        NULL    0
        !            12: #include <sys/param.h>
        !            13: #include <sys/dir.h>
        !            14: #include <sys/stat.h>
        !            15: 
        !            16: static char    dev[]   = "/dev/";
        !            17: char   *strcpy();
        !            18: char   *strcat();
        !            19: 
        !            20: char *
        !            21: ttyname(f)
        !            22: {
        !            23:        struct stat fsb;
        !            24:        struct stat tsb;
        !            25:        register struct direct *db;
        !            26:        register DIR *df;
        !            27:        static char rbuf[32];
        !            28: 
        !            29:        if (isatty(f)==0)
        !            30:                return(NULL);
        !            31:        if (fstat(f, &fsb) < 0)
        !            32:                return(NULL);
        !            33:        if ((fsb.st_mode&S_IFMT) != S_IFCHR)
        !            34:                return(NULL);
        !            35:        if ((df = opendir(dev)) == NULL)
        !            36:                return(NULL);
        !            37:        while ((db = readdir(df)) != NULL) {
        !            38:                if (db->d_ino != fsb.st_ino)
        !            39:                        continue;
        !            40:                strcpy(rbuf, dev);
        !            41:                strcat(rbuf, db->d_name);
        !            42:                if (stat(rbuf, &tsb) < 0)
        !            43:                        continue;
        !            44:                if (tsb.st_dev == fsb.st_dev && tsb.st_ino == fsb.st_ino) {
        !            45:                        closedir(df);
        !            46:                        return(rbuf);
        !            47:                }
        !            48:        }
        !            49:        closedir(df);
        !            50:        return(NULL);
        !            51: }

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