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/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#define _GNU_SOURCE
#include <features.h>
#include <ttyent.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#ifdef __UCLIBC_HAS_THREADS__
#include <pthread.h>
#endif
static char zapchar;
static FILE *tf;
static struct ttyent tty;
struct ttyent * getttynam(const char *tty)
{
register struct ttyent *t;
setttyent();
while ((t = getttyent()))
if (!strcmp(tty, t->ty_name))
break;
endttyent();
return (t);
}
/* Skip over the current field, removing quotes, and return
* a pointer to the next field.
*/
#define QUOTED 1
static char * skip(register char *p)
{
register char *t;
register int c, q;
for (q = 0, t = p; (c = *p) != '\0'; p++) {
if (c == '"') {
q ^= QUOTED; /* obscure, but nice */
continue;
}
if (q == QUOTED && *p == '\\' && *(p+1) == '"')
p++;
*t++ = *p;
if (q == QUOTED)
continue;
if (c == '#') {
zapchar = c;
*p = 0;
break;
}
if (c == '\t' || c == ' ' || c == '\n') {
zapchar = c;
*p++ = 0;
while ((c = *p) == '\t' || c == ' ' || c == '\n')
p++;
break;
}
}
*--t = '\0';
return (p);
}
static char * value(register char *p)
{
return ((p = index(p, '=')) ? ++p : NULL);
}
struct ttyent * getttyent(void)
{
register int c;
register char *p;
static char *line = NULL;
if (!tf && !setttyent())
return (NULL);
if (!line) {
line = malloc(BUFSIZ);
if (!line)
abort();
}
__STDIO_ALWAYS_THREADLOCK(tf);
for (;;) {
if (!fgets_unlocked(p = line, BUFSIZ, tf)) {
__STDIO_ALWAYS_THREADUNLOCK(tf);
return (NULL);
}
/* skip lines that are too big */
if (!index(p, '\n')) {
while ((c = getc_unlocked(tf)) != '\n' && c != EOF)
;
continue;
}
while (isspace(*p))
++p;
if (*p && *p != '#')
break;
}
zapchar = 0;
tty.ty_name = p;
p = skip(p);
if (!*(tty.ty_getty = p))
tty.ty_getty = tty.ty_type = NULL;
else {
p = skip(p);
if (!*(tty.ty_type = p))
tty.ty_type = NULL;
else
p = skip(p);
}
tty.ty_status = 0;
tty.ty_window = NULL;
#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace(p[sizeof(e) - 1])
#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
for (; *p; p = skip(p)) {
if (scmp(_TTYS_OFF))
tty.ty_status &= ~TTY_ON;
else if (scmp(_TTYS_ON))
tty.ty_status |= TTY_ON;
else if (scmp(_TTYS_SECURE))
tty.ty_status |= TTY_SECURE;
else if (vcmp(_TTYS_WINDOW))
tty.ty_window = value(p);
else
break;
}
/* We can release the lock only here since `zapchar' is global. */
__STDIO_ALWAYS_THREADUNLOCK(tf);
if (zapchar == '#' || *p == '#')
while ((c = *++p) == ' ' || c == '\t')
;
tty.ty_comment = p;
if (*p == 0)
tty.ty_comment = 0;
if ((p = index(p, '\n')))
*p = '\0';
return (&tty);
}
int setttyent(void)
{
if (tf) {
rewind(tf);
return (1);
} else if ((tf = fopen(_PATH_TTYS, "r"))) {
/* We do the locking ourselves. */
#ifdef __UCLIBC_HAS_THREADS__
__fsetlocking (tf, FSETLOCKING_BYCALLER);
#endif
return (1);
}
return (0);
}
int endttyent(void)
{
int rval;
if (tf) {
rval = !(fclose(tf) == EOF);
tf = NULL;
return (rval);
}
return (1);
}
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