freebsd-dev/lib/libc/gen/getttyent.c
Ed Schouten b3608ae18f Replace index() and rindex() calls with strchr() and strrchr().
The index() and rindex() functions were marked LEGACY in the 2001
revision of POSIX and were subsequently removed from the 2008 revision.
The strchr() and strrchr() functions are part of the C standard.

This makes the source code a lot more consistent, as most of these C
files also call into other str*() routines. In fact, about a dozen
already perform strchr() calls.
2012-01-03 18:51:58 +00:00

258 lines
5.6 KiB
C

/*
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <ttyent.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
static char zapchar;
static FILE *tf;
static size_t lbsize;
static char *line;
#define MALLOCCHUNK 100
static char *skip(char *);
static char *value(char *);
struct ttyent *
getttynam(const char *tty)
{
struct ttyent *t;
if (strncmp(tty, "/dev/", 5) == 0)
tty += 5;
setttyent();
while ( (t = getttyent()) )
if (!strcmp(tty, t->ty_name))
break;
endttyent();
return (t);
}
struct ttyent *
getttyent(void)
{
static struct ttyent tty;
char *p;
int c;
size_t i;
if (!tf && !setttyent())
return (NULL);
for (;;) {
if (!fgets(p = line, lbsize, tf))
return (NULL);
/* extend buffer if line was too big, and retry */
while (!strchr(p, '\n') && !feof(tf)) {
i = strlen(p);
lbsize += MALLOCCHUNK;
if ((p = realloc(line, lbsize)) == NULL) {
(void)endttyent();
return (NULL);
}
line = p;
if (!fgets(&line[i], lbsize - i, tf))
return (NULL);
}
while (isspace((unsigned char)*p))
++p;
if (*p && *p != '#')
break;
}
#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1])
#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
zapchar = 0;
tty.ty_name = p;
tty.ty_status = 0;
tty.ty_window = NULL;
tty.ty_group = _TTYS_NOGROUP;
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 {
/* compatibility kludge: handle network/dialup specially */
if (scmp(_TTYS_DIALUP))
tty.ty_status |= TTY_DIALUP;
else if (scmp(_TTYS_NETWORK))
tty.ty_status |= TTY_NETWORK;
p = skip(p);
}
}
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 (scmp(_TTYS_INSECURE))
tty.ty_status &= ~TTY_SECURE;
else if (scmp(_TTYS_DIALUP))
tty.ty_status |= TTY_DIALUP;
else if (scmp(_TTYS_NETWORK))
tty.ty_status |= TTY_NETWORK;
else if (vcmp(_TTYS_WINDOW))
tty.ty_window = value(p);
else if (vcmp(_TTYS_GROUP))
tty.ty_group = value(p);
else
break;
}
if (zapchar == '#' || *p == '#')
while ((c = *++p) == ' ' || c == '\t')
;
tty.ty_comment = p;
if (*p == 0)
tty.ty_comment = 0;
if ((p = strchr(p, '\n')))
*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 *t;
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(char *p)
{
return ((p = strchr(p, '=')) ? ++p : NULL);
}
int
setttyent(void)
{
if (line == NULL) {
if ((line = malloc(MALLOCCHUNK)) == NULL)
return (0);
lbsize = MALLOCCHUNK;
}
if (tf) {
rewind(tf);
return (1);
} else if ( (tf = fopen(_PATH_TTYS, "r")) )
return (1);
return (0);
}
int
endttyent(void)
{
int rval;
/*
* NB: Don't free `line' because getttynam()
* may still be referencing it
*/
if (tf) {
rval = (fclose(tf) != EOF);
tf = NULL;
return (rval);
}
return (1);
}
static int
isttystat(const char *tty, int flag)
{
struct ttyent *t;
return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag);
}
int
isdialuptty(const char *tty)
{
return isttystat(tty, TTY_DIALUP);
}
int
isnettty(const char *tty)
{
return isttystat(tty, TTY_NETWORK);
}