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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /misc/getttyent.c
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initial import
Diffstat (limited to 'misc/getttyent.c')
-rw-r--r--misc/getttyent.c199
1 files changed, 199 insertions, 0 deletions
diff --git a/misc/getttyent.c b/misc/getttyent.c
new file mode 100644
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+++ b/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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 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 <ctype.h>
+#include <string.h>
+
+static char zapchar;
+static FILE *tf;
+
+struct ttyent *
+getttynam(tty)
+ const char *tty;
+{
+ register struct ttyent *t;
+
+ setttyent();
+ while (t = getttyent())
+ if (!strcmp(tty, t->ty_name))
+ break;
+ endttyent();
+ return (t);
+}
+
+struct ttyent *
+getttyent()
+{
+ static struct ttyent tty;
+ register int c;
+ register char *p;
+#define MAXLINELENGTH 100
+ static char line[MAXLINELENGTH];
+ static char *skip(), *value();
+
+ if (!tf && !setttyent())
+ return (NULL);
+ for (;;) {
+ if (!fgets(p = line, sizeof(line), tf))
+ return (NULL);
+ /* skip lines that are too big */
+ if (!index(p, '\n')) {
+ while ((c = getc(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;
+ }
+
+ 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);
+}
+
+#define QUOTED 1
+
+/*
+ * Skip over the current field, removing quotes, and return a pointer to
+ * the next field.
+ */
+static char *
+skip(p)
+ register char *p;
+{
+ register char *t;
+ register 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(p)
+ register char *p;
+{
+
+ return ((p = index(p, '=')) ? ++p : NULL);
+}
+
+int
+setttyent()
+{
+
+ if (tf) {
+ (void)rewind(tf);
+ return (1);
+ } else if (tf = fopen(_PATH_TTYS, "r"))
+ return (1);
+ return (0);
+}
+
+int
+endttyent()
+{
+ int rval;
+
+ if (tf) {
+ rval = !(fclose(tf) == EOF);
+ tf = NULL;
+ return (rval);
+ }
+ return (1);
+}