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Annotation of 43BSD/lib/libc/gen/ttyname.c, revision 1.1.1.1

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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