minix/lib/nbsd_libc/gen/getttyent.c

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/* $NetBSD: getttyent.c,v 1.23 2006/04/17 23:29:21 salo Exp $ */
/*
* 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.
* 3. 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: getttyent.c,v 1.23 2006/04/17 23:29:21 salo Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include "namespace.h"
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <ttyent.h>
#include <errno.h>
#include <err.h>
#include <stdlib.h>
#ifdef __weak_alias
__weak_alias(endttyent,_endttyent)
__weak_alias(getttyent,_getttyent)
__weak_alias(getttynam,_getttynam)
__weak_alias(setttyent,_setttyent)
__weak_alias(setttyentpath,_setttyentpath)
#endif
static FILE *tf;
static size_t lineno = 0;
static char *skip(char *, char *);
static char *value(char *);
struct ttyent *
getttynam(const char *tty)
{
struct ttyent *t;
_DIAGASSERT(tty != NULL);
setttyent();
while ((t = getttyent()) != NULL)
if (!strcmp(tty, t->ty_name))
break;
endttyent();
return (t);
}
struct ttyent *
getttyent(void)
{
static struct ttyent tty;
int c;
char *p;
size_t len;
static char *line = NULL;
char zapchar;
if (line)
free(line);
if (!tf && !setttyent())
return NULL;
for (;;) {
errno = 0;
line = fparseln(tf, &len, &lineno, NULL, FPARSELN_UNESCALL);
if (line == NULL) {
if (errno != 0)
warn("%s", __func__);
return NULL;
}
for (p = line; *p && isspace((unsigned char)*p); p++)
continue;
if (*p && *p != '#')
break;
free(line);
}
tty.ty_name = p;
p = skip(p, &zapchar);
if (*(tty.ty_getty = p) == '\0')
tty.ty_getty = tty.ty_type = NULL;
else {
p = skip(p, &zapchar);
if (*(tty.ty_type = p) == '\0')
tty.ty_type = NULL;
else
p = skip(p, &zapchar);
}
tty.ty_status = 0;
tty.ty_window = NULL;
tty.ty_class = NULL;
#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && (isspace((unsigned char) p[sizeof(e) - 1]) || p[sizeof(e) - 1] == '\0')
#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
for (; *p; p = skip(p, &zapchar)) {
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 (scmp(_TTYS_LOCAL))
tty.ty_status |= TTY_LOCAL;
else if (scmp(_TTYS_RTSCTS))
tty.ty_status |= TTY_RTSCTS;
else if (scmp(_TTYS_DTRCTS))
tty.ty_status |= TTY_DTRCTS;
else if (scmp(_TTYS_SOFTCAR))
tty.ty_status |= TTY_SOFTCAR;
else if (scmp(_TTYS_MDMBUF))
tty.ty_status |= TTY_MDMBUF;
else if (vcmp(_TTYS_WINDOW))
tty.ty_window = value(p);
else if (vcmp(_TTYS_CLASS))
tty.ty_class = value(p);
else
warnx("%s: %s, %lu: unknown option `%s'",
__func__, _PATH_TTYS, (unsigned long)lineno, p);
}
if (zapchar == '#' || *p == '#')
while ((c = *++p) == ' ' || c == '\t')
continue;
tty.ty_comment = p;
if (*p == '\0')
tty.ty_comment = NULL;
if ((p = strchr(p, '\n')) != NULL)
*p = '\0';
return &tty;
}
#define QUOTED 1
/*
* Skip over the current field, removing quotes, and return a pointer to
* the next field.
*/
static char *
skip(char *p, char *zapchar)
{
char *t;
int c, q;
_DIAGASSERT(p != NULL);
*zapchar = '\0';
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';
*--t = '\0';
return p;
}
if (c == '\t' || c == ' ' || c == '\n') {
*zapchar = c;
*p++ = '\0';
while ((c = *p) == '\t' || c == ' ' || c == '\n')
p++;
*--t = '\0';
return p;
}
}
if (t != p)
*t = '\0';
return p;
}
static char *
value(char *p)
{
_DIAGASSERT(p != NULL);
return (p = strchr(p, '=')) != NULL ? ++p : NULL;
}
int
setttyentpath(const char *path)
{
lineno = 0;
if (tf) {
rewind(tf);
return 1;
} else if ((tf = fopen(path, "r")) != NULL)
return 1;
return 0;
}
int
setttyent(void)
{
return setttyentpath(_PATH_TTYS);
}
int
endttyent(void)
{
int rval;
if (tf) {
rval = !(fclose(tf) == EOF);
tf = NULL;
return rval;
}
return 1;
}