Return to getttyent.c CVS log | Up to [cvs.NetBSD.org] / src / lib / libc / gen |
File: [cvs.NetBSD.org] / src / lib / libc / gen / getttyent.c (download)
Revision 1.23, Mon Apr 17 23:29:21 2006 UTC (17 years, 11 months ago) by salo
Add setttyentpath(), functionally equivalent to setttyent() but takes an additional argument to read the ttys information from an alternate path istead of _PATH_TTYS. Required for upcoming init(8) changes. Mostly from <apb>. Bump libc minor. |
/* $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(__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; }