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/* dev_hash.c
*
* code that looks up device names from numbers */
#include "config.h"
/* AIX requires this to be the first thing in the file. */
#ifdef __GNUC__
# define alloca __builtin_alloca
#else
# if HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
char *alloca ();
# endif
# endif
# endif
#endif
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <pwd.h>
#include "common.h"
#include "hashtab.h"
#include "dev_hash.h"
#if HAVE_DIRENT_H
# include <dirent.h>
# define NAMLEN(dirent) strlen((dirent)->d_name)
#else
# define dirent direct
# define NAMLEN(dirent) (dirent)->d_namlen
# if HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# if HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
# if HAVE_NDIR_H
# include <ndir.h>
# endif
#endif
/* globals */
struct hashtab *dev_table = NULL;
struct dev_data {
char *name; /* name of the device */
};
/* Read the DIRNAME directory entries and make a linked list of ttys
(so we can search through it later) */
static
void
setup_devices (char *dirname)
{
DIR *dirp; /* the directory itself */
struct dirent *dp; /* directory entry structure */
struct stat sp; /* file information structure */
extern int debugging_enabled;
if (debugging_enabled)
fprintf (stddebug, "device devnum\n-----------------\n");
if ((dirp = opendir (dirname)) == NULL)
return; /* skip it silently */
for (dp = readdir (dirp); dp != NULL; dp = readdir (dirp))
{
char *fullname = (char *) alloca ((strlen (dirname)
+ NAMLEN (dp)
+ 1) * sizeof (char));
sprintf (fullname, "%s/%s", dirname, dp->d_name);
stat (fullname, &sp);
if ((sp.st_mode & S_IFMT) != S_IFCHR) /* skip if not a tty */
continue;
if (debugging_enabled)
fprintf (stddebug, "%-8.8d %s\n", (int) sp.st_rdev, dp->d_name);
/* entry OK, so put it into the list */
{
struct hashtab_elem *he;
struct dev_data dd;
long dev_num;
dev_num = sp.st_rdev;
dd.name = (char *) xmalloc (sizeof (char) * (NAMLEN (dp) + 1));
strcpy (dd.name, dp->d_name);
he = hashtab_create (dev_table, (void *) &dev_num, sizeof (dev_num));
hashtab_set_value (he, &dd, sizeof (dd));
}
}
closedir (dirp);
}
/* Return the name of the device associated with DEV_NUM. The
argument passed was originally a dev_t, but that data type is too
limited on some systems (won't let us pass -1 because it's an
unsigned short or other). */
char *
devname (long dev_num)
{
struct hashtab_elem *he;
/* special case */
if (dev_num == -1)
return "__";
if (dev_table == NULL)
{
dev_table = hashtab_init (sizeof (long));
setup_devices ("/dev"); /* most certainly */
setup_devices ("/dev/pty"); /* perhaps */
setup_devices ("/dev/ptym"); /* perhaps */
}
he = hashtab_find (dev_table, (void *) &dev_num, sizeof (dev_num));
if (he != NULL)
{
struct dev_data *dd = hashtab_get_value (he);
return dd->name;
}
/* didn't find it */
return "??";
}
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