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Annotation of 42BSD/lib/libc/gen/ttyname.c, revision 1.1

1.1     ! root        1: /* @(#)ttyname.c       4.3 (Berkeley) 5/7/82 */
        !             2: /*
        !             3:  * ttyname(f): return "/dev/ttyXX" which the the name of the
        !             4:  * tty belonging to file f.
        !             5:  *  NULL if it is not a tty
        !             6:  */
        !             7: 
        !             8: #define        NULL    0
        !             9: #include <sys/param.h>
        !            10: #include <sys/dir.h>
        !            11: #include <sys/stat.h>
        !            12: 
        !            13: static char    dev[]   = "/dev/";
        !            14: char   *strcpy();
        !            15: char   *strcat();
        !            16: 
        !            17: char *
        !            18: ttyname(f)
        !            19: {
        !            20:        struct stat fsb;
        !            21:        struct stat tsb;
        !            22:        register struct direct *db;
        !            23:        register DIR *df;
        !            24:        static char rbuf[32];
        !            25: 
        !            26:        if (isatty(f)==0)
        !            27:                return(NULL);
        !            28:        if (fstat(f, &fsb) < 0)
        !            29:                return(NULL);
        !            30:        if ((fsb.st_mode&S_IFMT) != S_IFCHR)
        !            31:                return(NULL);
        !            32:        if ((df = opendir(dev)) == NULL)
        !            33:                return(NULL);
        !            34:        while ((db = readdir(df)) != NULL) {
        !            35:                if (db->d_ino != fsb.st_ino)
        !            36:                        continue;
        !            37:                strcpy(rbuf, dev);
        !            38:                strcat(rbuf, db->d_name);
        !            39:                if (stat(rbuf, &tsb) < 0)
        !            40:                        continue;
        !            41:                if (tsb.st_dev == fsb.st_dev && tsb.st_ino == fsb.st_ino) {
        !            42:                        closedir(df);
        !            43:                        return(rbuf);
        !            44:                }
        !            45:        }
        !            46:        closedir(df);
        !            47:        return(NULL);
        !            48: }

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