/* $OpenBSD: getttyent.c,v 1.12 2009/11/09 00:18:27 kurt 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 #include #include #include static char zapchar; static FILE *tf; static char *skip(char *); static char *value(char *); struct ttyent * getttynam(const char *tty) { struct ttyent *t; setttyent(); while ((t = getttyent())) if (!strcmp(tty, t->ty_name)) break; endttyent(); return (t); } struct ttyent * getttyent(void) { static struct ttyent tty; int c; char *p; #define MAXLINELENGTH 200 static char line[MAXLINELENGTH]; if (!tf && !setttyent()) return (NULL); for (;;) { if (!fgets(p = line, sizeof(line), tf)) return (NULL); /* skip lines that are too big */ if (!strchr(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 (scmp(_TTYS_LOCAL)) tty.ty_status |= TTY_LOCAL; else if (scmp(_TTYS_RTSCTS)) tty.ty_status |= TTY_RTSCTS; 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 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 (tf) { rewind(tf); return (1); } else if ((tf = fopen(_PATH_TTYS, "r"))) return (1); return (0); } int endttyent(void) { int rval; if (tf) { rval = !(fclose(tf) == EOF); tf = NULL; return (rval); } return (1); }