Support getttyent and friends so ncurses will compile

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);
+}