/* $NetBSD: getttyent.c,v 1.26 2013/06/30 10:07:43 martin 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 #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 1.26 2013/06/30 10:07:43 martin Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include #include #include #include #include #include #include #include #include #include #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(__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; } /* * Try .$MACHINE (e.g. etc/ttys.amd64) */ { char machine[_SYS_NMLN]; const int mib[] = { [0] = CTL_HW, [1] = HW_MACHINE, }; size_t len = sizeof(machine); if (sysctl(mib, (u_int)__arraycount(mib), machine, &len, NULL, 0) != -1) { char npath[PATH_MAX]; (void)snprintf(npath, sizeof(npath), "%s.%s", path, machine); if ((tf = fopen(npath, "re")) != NULL) return 1; } } if ((tf = fopen(path, "re")) != 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; }