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authorjkh <jkh@FreeBSD.org>1994-08-26 05:32:15 +0000
committerjkh <jkh@FreeBSD.org>1994-08-26 05:32:15 +0000
commitc1a91349de5c24c9662144f74850afac9a9bbd61 (patch)
treee3870fec6dd6949d635f27ac6b1441ec339a5504 /libexec/getty
parent8028c13dae4a2bd05f83b1db733d96fa46868952 (diff)
downloadFreeBSD-src-c1a91349de5c24c9662144f74850afac9a9bbd61.zip
FreeBSD-src-c1a91349de5c24c9662144f74850afac9a9bbd61.tar.gz
Whoops - forgot to add this guy.
Reviewed by: Submitted by: jkh
Diffstat (limited to 'libexec/getty')
-rw-r--r--libexec/getty/gettytab.c339
1 files changed, 339 insertions, 0 deletions
diff --git a/libexec/getty/gettytab.c b/libexec/getty/gettytab.c
new file mode 100644
index 0000000..a864529
--- /dev/null
+++ b/libexec/getty/gettytab.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (c) 1983 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)gettytab.c 5.5 (Berkeley) 2/25/91";
+#endif /* not lint */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+#include "pathnames.h"
+
+#define TABBUFSIZ 512
+
+static char *tbuf;
+int hopcount; /* detect infinite loops in termcap, init 0 */
+static char *skip();
+char *getstr();
+static char *decode();
+
+/*
+ * Get an entry for terminal name in buffer bp,
+ * from the termcap file. Parse is very rudimentary;
+ * we just notice escaped newlines.
+ */
+getent(bp, name)
+ char *bp, *name;
+{
+ register char *cp;
+ register int c;
+ register int i = 0, cnt = 0;
+ char ibuf[TABBUFSIZ];
+ char *cp2;
+ int tf;
+
+ tbuf = bp;
+ tf = open(_PATH_GETTYTAB, O_RDONLY, 0);
+ if (tf < 0)
+ return (-1);
+ for (;;) {
+ cp = bp;
+ for (;;) {
+ if (i == cnt) {
+ cnt = read(tf, ibuf, TABBUFSIZ);
+ if (cnt <= 0) {
+ close(tf);
+ return (0);
+ }
+ i = 0;
+ }
+ c = ibuf[i++];
+ if (c == '\n') {
+ if (cp > bp && cp[-1] == '\\'){
+ cp--;
+ continue;
+ }
+ break;
+ }
+ if (cp >= bp+TABBUFSIZ) {
+ write(2,"Gettytab entry too long\n", 24);
+ break;
+ } else
+ *cp++ = c;
+ }
+ *cp = 0;
+
+ /*
+ * The real work for the match.
+ */
+ if (namatch(name)) {
+ close(tf);
+ return(nchktc());
+ }
+ }
+}
+
+/*
+ * tnchktc: check the last entry, see if it's tc=xxx. If so,
+ * recursively find xxx and append that entry (minus the names)
+ * to take the place of the tc=xxx entry. This allows termcap
+ * entries to say "like an HP2621 but doesn't turn on the labels".
+ * Note that this works because of the left to right scan.
+ */
+#define MAXHOP 32
+nchktc()
+{
+ register char *p, *q;
+ char tcname[16]; /* name of similar terminal */
+ char tcbuf[TABBUFSIZ];
+ char *holdtbuf = tbuf;
+ int l;
+
+ p = tbuf + strlen(tbuf) - 2; /* before the last colon */
+ while (*--p != ':')
+ if (p<tbuf) {
+ write(2, "Bad gettytab entry\n", 19);
+ return (0);
+ }
+ p++;
+ /* p now points to beginning of last field */
+ if (p[0] != 't' || p[1] != 'c')
+ return(1);
+ strcpy(tcname,p+3);
+ q = tcname;
+ while (q && *q != ':')
+ q++;
+ *q = 0;
+ if (++hopcount > MAXHOP) {
+ write(2, "Getty: infinite tc= loop\n", 25);
+ return (0);
+ }
+ if (getent(tcbuf, tcname) != 1)
+ return(0);
+ for (q=tcbuf; *q != ':'; q++)
+ ;
+ l = p - holdtbuf + strlen(q);
+ if (l > TABBUFSIZ) {
+ write(2, "Gettytab entry too long\n", 24);
+ q[TABBUFSIZ - (p-tbuf)] = 0;
+ }
+ strcpy(p, q+1);
+ tbuf = holdtbuf;
+ return(1);
+}
+
+/*
+ * Tnamatch deals with name matching. The first field of the termcap
+ * entry is a sequence of names separated by |'s, so we compare
+ * against each such name. The normal : terminator after the last
+ * name (before the first field) stops us.
+ */
+namatch(np)
+ char *np;
+{
+ register char *Np, *Bp;
+
+ Bp = tbuf;
+ if (*Bp == '#')
+ return(0);
+ for (;;) {
+ for (Np = np; *Np && *Bp == *Np; Bp++, Np++)
+ continue;
+ if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0))
+ return (1);
+ while (*Bp && *Bp != ':' && *Bp != '|')
+ Bp++;
+ if (*Bp == 0 || *Bp == ':')
+ return (0);
+ Bp++;
+ }
+}
+
+/*
+ * Skip to the next field. Notice that this is very dumb, not
+ * knowing about \: escapes or any such. If necessary, :'s can be put
+ * into the termcap file in octal.
+ */
+static char *
+skip(bp)
+ register char *bp;
+{
+
+ while (*bp && *bp != ':')
+ bp++;
+ if (*bp == ':')
+ bp++;
+ return (bp);
+}
+
+/*
+ * Return the (numeric) option id.
+ * Numeric options look like
+ * li#80
+ * i.e. the option string is separated from the numeric value by
+ * a # character. If the option is not found we return -1.
+ * Note that we handle octal numbers beginning with 0.
+ */
+long
+getnum(id)
+ char *id;
+{
+ register long i, base;
+ register char *bp = tbuf;
+
+ for (;;) {
+ bp = skip(bp);
+ if (*bp == 0)
+ return (-1);
+ if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
+ continue;
+ if (*bp == '@')
+ return(-1);
+ if (*bp != '#')
+ continue;
+ bp++;
+ base = 10;
+ if (*bp == '0')
+ base = 8;
+ i = 0;
+ while (isdigit(*bp))
+ i *= base, i += *bp++ - '0';
+ return (i);
+ }
+}
+
+/*
+ * Handle a flag option.
+ * Flag options are given "naked", i.e. followed by a : or the end
+ * of the buffer. Return 1 if we find the option, or 0 if it is
+ * not given.
+ */
+getflag(id)
+ char *id;
+{
+ register char *bp = tbuf;
+
+ for (;;) {
+ bp = skip(bp);
+ if (!*bp)
+ return (-1);
+ if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) {
+ if (!*bp || *bp == ':')
+ return (1);
+ else if (*bp == '!')
+ return (0);
+ else if (*bp == '@')
+ return(-1);
+ }
+ }
+}
+
+/*
+ * Get a string valued option.
+ * These are given as
+ * cl=^Z
+ * Much decoding is done on the strings, and the strings are
+ * placed in area, which is a ref parameter which is updated.
+ * No checking on area overflow.
+ */
+char *
+getstr(id, area)
+ char *id, **area;
+{
+ register char *bp = tbuf;
+
+ for (;;) {
+ bp = skip(bp);
+ if (!*bp)
+ return (0);
+ if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1])
+ continue;
+ if (*bp == '@')
+ return(0);
+ if (*bp != '=')
+ continue;
+ bp++;
+ return (decode(bp, area));
+ }
+}
+
+/*
+ * Tdecode does the grung work to decode the
+ * string capability escapes.
+ */
+static char *
+decode(str, area)
+ register char *str;
+ char **area;
+{
+ register char *cp;
+ register int c;
+ register char *dp;
+ int i;
+
+ cp = *area;
+ while ((c = *str++) && c != ':') {
+ switch (c) {
+
+ case '^':
+ c = *str++ & 037;
+ break;
+
+ case '\\':
+ dp = "E\033^^\\\\::n\nr\rt\tb\bf\f";
+ c = *str++;
+nextc:
+ if (*dp++ == c) {
+ c = *dp++;
+ break;
+ }
+ dp++;
+ if (*dp)
+ goto nextc;
+ if (isdigit(c)) {
+ c -= '0', i = 2;
+ do
+ c <<= 3, c |= *str++ - '0';
+ while (--i && isdigit(*str));
+ }
+ break;
+ }
+ *cp++ = c;
+ }
+ *cp++ = 0;
+ str = *area;
+ *area = cp;
+ return (str);
+}
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