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glibc/misc/getttyent.c
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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. | |
*/ | |
#if defined(LIBC_SCCS) && !defined(lint) | |
static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93"; | |
#endif /* LIBC_SCCS and not lint */ | |
#include <ttyent.h> | |
#include <stdio.h> | |
#include <stdio_ext.h> | |
#include <ctype.h> | |
#include <string.h> | |
#define flockfile(s) _IO_flockfile (s) | |
#define funlockfile(s) _IO_funlockfile (s) | |
static char zapchar; | |
static FILE *tf; | |
struct ttyent * | |
__getttynam (const char *tty) | |
{ | |
struct ttyent *t; | |
__setttyent(); | |
while ((t = __getttyent())) | |
if (!strcmp(tty, t->ty_name)) | |
break; | |
__endttyent(); | |
return (t); | |
} | |
weak_alias (__getttynam, getttynam) | |
static char *skip (char *) __THROW internal_function; | |
static char *value (char *) __THROW internal_function; | |
struct ttyent * | |
__getttyent (void) | |
{ | |
static struct ttyent tty; | |
int c; | |
char *p; | |
#define MAXLINELENGTH 100 | |
static char line[MAXLINELENGTH]; | |
if (!tf && !__setttyent()) | |
return (NULL); | |
flockfile (tf); | |
for (;;) { | |
if (!__fgets_unlocked(p = line, sizeof(line), tf)) { | |
funlockfile (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. */ | |
funlockfile(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); | |
} | |
libc_hidden_def (__getttyent) | |
weak_alias (__getttyent, getttyent) | |
#define QUOTED 1 | |
/* | |
* Skip over the current field, removing quotes, and return a pointer to | |
* the next field. | |
*/ | |
static char * | |
internal_function | |
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 * | |
internal_function | |
value (char *p) | |
{ | |
return ((p = index(p, '=')) ? ++p : NULL); | |
} | |
int | |
__setttyent (void) | |
{ | |
if (tf) { | |
(void)rewind(tf); | |
return (1); | |
} else if ((tf = fopen(_PATH_TTYS, "rce"))) { | |
/* We do the locking ourselves. */ | |
__fsetlocking (tf, FSETLOCKING_BYCALLER); | |
return (1); | |
} | |
return (0); | |
} | |
libc_hidden_def (__setttyent) | |
weak_alias (__setttyent, setttyent) | |
int | |
__endttyent (void) | |
{ | |
int rval; | |
if (tf) { | |
rval = !(fclose(tf) == EOF); | |
tf = NULL; | |
return (rval); | |
} | |
return (1); | |
} | |
libc_hidden_def (__endttyent) | |
weak_alias (__endttyent, endttyent) |