summaryrefslogtreecommitdiff
path: root/libc/misc/ttyent/getttyent.c
diff options
context:
space:
mode:
Diffstat (limited to 'libc/misc/ttyent/getttyent.c')
-rw-r--r--libc/misc/ttyent/getttyent.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/libc/misc/ttyent/getttyent.c b/libc/misc/ttyent/getttyent.c
new file mode 100644
index 000000000..7784a6ab4
--- /dev/null
+++ b/libc/misc/ttyent/getttyent.c
@@ -0,0 +1,198 @@
+/*
+ * 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 0
+static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
+#endif
+
+#include <ttyent.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <ctype.h>
+#include <string.h>
+
+static char zapchar;
+static FILE *tf;
+
+struct ttyent *
+getttynam(const char *tty)
+{
+ register struct ttyent *t;
+
+ setttyent();
+ while ((t = getttyent()))
+ if (!strcmp(tty, t->ty_name))
+ break;
+ endttyent();
+ return (t);
+}
+
+static char *skip __P((char *));
+static char *value __P((char *));
+
+struct ttyent * getttyent()
+{
+ static struct ttyent tty;
+ register int c;
+ register 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);
+}
+
+#define QUOTED 1
+
+/*
+ * Skip over the current field, removing quotes, and return a pointer to
+ * the next field.
+ */
+static char * skip(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(register char *p)
+{
+
+ return ((p = index(p, '=')) ? ++p : NULL);
+}
+
+int setttyent(void)
+{
+
+ if (tf) {
+ rewind(tf);
+ return (1);
+ } else if ((tf = fopen(_PATH_TTYS, "r"))) {
+ /* We do the locking ourselves. */
+ __fsetlocking (tf, FSETLOCKING_BYCALLER);
+ return (1);
+ }
+ return (0);
+}
+
+int endttyent(void)
+{
+ int rval;
+
+ if (tf) {
+ rval = !(fclose(tf) == EOF);
+ tf = NULL;
+ return (rval);
+ }
+ return (1);
+}