date and time created 84/04/27 10:25:32 by ralph

[unix-history] / usr / src / lib / libc / gen / getttyent.c

/* @(#)getttyent.c      4.1 (Berkeley) %G% */

#include <stdio.h>
#include <ttyent.h>

static char TTYFILE[] = "/etc/ttys";
static char EMPTY[] = "";
static FILE *tf = NULL;
static char line[BUFSIZ+1];
static struct ttyent tty;

setttyent()
{
       if (tf == NULL)
               tf = fopen(TTYFILE, "r");
       else
               rewind(tf);
}

endttyent()
{
       if (tf != NULL) {
               (void) fclose(tf);
               tf = NULL;
       }
}

static char *
skip(p)
register char *p;
{
       register int c;

       while ((c = *p) != '\0') {
               if (c == '#') {
                       *p = '\0';
                       break;
               }
               if (c == '\t' || c == ' ' || c == '\n') {
                       *p++ = '\0';
                       while ((c = *p) == '\t' || c == ' ' || c == '\n')
                               p++;
                       break;
               }
               p++;
       }
       return (p);
}

struct ttyent *
getttyent()
{
       register char *p, *cp;
       register int c;

       if (tf == NULL) {
               if ((tf = fopen(TTYFILE, "r")) == NULL)
                       return (NULL);
       }
       do {
               p = fgets(line, BUFSIZ, tf);
               if (p == NULL)
                       return (NULL);
               while ((c = *p) == '\t' || c == ' ' || c == '\n')
                       p++;
       } while (c == '\0' || c == '#');
       tty.ty_name = p;
       p = skip(p);
       tty.ty_getty = p;
       p = skip(p);
       tty.ty_type = p;
       tty.ty_status = 0;
       for (p = skip(p); *p; p = cp) {
               cp = skip(p);
               if (strcmp(p, "on") == 0)
                       tty.ty_status |= TTY_ON;
               else if (strcmp(p, "off") == 0)
                       tty.ty_status &= ~TTY_ON;
               else if (strcmp(p, "secure") == 0)
                       tty.ty_status |= TTY_SECURE;
       }
       tty.ty_comment = EMPTY;
       return (&tty);
}