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-rw-r--r--lib/libc/gen/getttyent.c299
1 files changed, 299 insertions, 0 deletions
diff --git a/lib/libc/gen/getttyent.c b/lib/libc/gen/getttyent.c
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--- /dev/null
+++ b/lib/libc/gen/getttyent.c
@@ -0,0 +1,299 @@
+/*
+ * 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 defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)getttyent.c 8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <ttyent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <dirent.h>
+#include <paths.h>
+
+static char zapchar;
+static FILE *tf;
+static int maxpts = 0;
+static int curpts = 0;
+static int pts_valid = 0;
+static size_t lbsize;
+static char *line;
+
+#define PTS "pts/"
+#define MALLOCCHUNK 100
+
+static char *skip(char *);
+static char *value(char *);
+
+struct ttyent *
+getttynam(tty)
+ const char *tty;
+{
+ struct ttyent *t;
+
+ if (strncmp(tty, "/dev/", 5) == 0)
+ tty += 5;
+ setttyent();
+ while ( (t = getttyent()) )
+ if (!strcmp(tty, t->ty_name))
+ break;
+ endttyent();
+ return (t);
+}
+
+struct ttyent *
+getttyent()
+{
+ static struct ttyent tty;
+ static char devpts_name[] = "pts/4294967295";
+ char *p;
+ int c;
+ size_t i;
+
+ if (!tf && !setttyent())
+ return (NULL);
+ for (;;) {
+ if (!fgets(p = line, lbsize, tf)) {
+ if (pts_valid == 1 && curpts <= maxpts) {
+ sprintf(devpts_name, "pts/%d", curpts++);
+ tty.ty_name = devpts_name;
+ tty.ty_getty = tty.ty_type = NULL;
+ tty.ty_status = TTY_NETWORK;
+ tty.ty_window = NULL;
+ tty.ty_comment = NULL;
+ tty.ty_group = _TTYS_NOGROUP;
+ return (&tty);
+ }
+ return (NULL);
+ }
+ /* extend buffer if line was too big, and retry */
+ while (!index(p, '\n')) {
+ i = strlen(p);
+ lbsize += MALLOCCHUNK;
+ if ((p = realloc(line, lbsize)) == NULL) {
+ (void)endttyent();
+ return (NULL);
+ }
+ line = p;
+ if (!fgets(&line[i], lbsize - i, tf))
+ return (NULL);
+ }
+ while (isspace((unsigned char)*p))
+ ++p;
+ if (*p && *p != '#')
+ break;
+ }
+
+#define scmp(e) !strncmp(p, e, sizeof(e) - 1) && isspace((unsigned char)p[sizeof(e) - 1])
+#define vcmp(e) !strncmp(p, e, sizeof(e) - 1) && p[sizeof(e) - 1] == '='
+
+ zapchar = 0;
+ tty.ty_name = p;
+ tty.ty_status = 0;
+ tty.ty_window = NULL;
+ tty.ty_group = _TTYS_NOGROUP;
+
+ 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 {
+ /* compatibility kludge: handle network/dialup specially */
+ if (scmp(_TTYS_DIALUP))
+ tty.ty_status |= TTY_DIALUP;
+ else if (scmp(_TTYS_NETWORK))
+ tty.ty_status |= TTY_NETWORK;
+ p = skip(p);
+ }
+ }
+
+ 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_INSECURE))
+ tty.ty_status &= ~TTY_SECURE;
+ else if (scmp(_TTYS_DIALUP))
+ tty.ty_status |= TTY_DIALUP;
+ else if (scmp(_TTYS_NETWORK))
+ tty.ty_status |= TTY_NETWORK;
+ else if (vcmp(_TTYS_WINDOW))
+ tty.ty_window = value(p);
+ else if (vcmp(_TTYS_GROUP))
+ tty.ty_group = 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)
+ 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(p)
+ char *p;
+{
+
+ return ((p = index(p, '=')) ? ++p : NULL);
+}
+
+int
+setttyent()
+{
+ DIR *devpts_dir;
+
+ if (line == NULL) {
+ if ((line = malloc(MALLOCCHUNK)) == NULL)
+ return (0);
+ lbsize = MALLOCCHUNK;
+ }
+ devpts_dir = opendir(_PATH_DEV PTS);
+ if (devpts_dir) {
+ struct dirent *dp;
+
+ while ((dp = readdir(devpts_dir))) {
+ if (strcmp(dp->d_name, ".") != 0 &&
+ strcmp(dp->d_name, "..") != 0) {
+ if (atoi(dp->d_name) > maxpts) {
+ maxpts = atoi(dp->d_name);
+ pts_valid = 1;
+ curpts = 0;
+ }
+ }
+ }
+ closedir(devpts_dir);
+ }
+ if (tf) {
+ rewind(tf);
+ return (1);
+ } else if ( (tf = fopen(_PATH_TTYS, "r")) )
+ return (1);
+ return (0);
+}
+
+int
+endttyent()
+{
+ int rval;
+
+ pts_valid = 0;
+ /*
+ * NB: Don't free `line' because getttynam()
+ * may still be referencing it
+ */
+ if (tf) {
+ rval = (fclose(tf) != EOF);
+ tf = NULL;
+ return (rval);
+ }
+ return (1);
+}
+
+static int
+isttystat(tty, flag)
+ const char *tty;
+ int flag;
+{
+ struct ttyent *t;
+
+ return ((t = getttynam(tty)) == NULL) ? 0 : !!(t->ty_status & flag);
+}
+
+
+int
+isdialuptty(tty)
+ const char *tty;
+{
+
+ return isttystat(tty, TTY_DIALUP);
+}
+
+int isnettty(tty)
+ const char *tty;
+{
+
+ return isttystat(tty, TTY_NETWORK);
+}
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