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306 lines
8.3 KiB
C
306 lines
8.3 KiB
C
/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)termcap.c 8.1 (Berkeley) 6/4/93";
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#endif /* not lint */
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#define PBUFSIZ 512 /* max length of filename path */
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#define PVECSIZ 32 /* max number of names in path */
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#define TBUFSIZ 1024 /* max length of tgetent buffer */
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <termios.h>
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#include <signal.h>
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#include <errno.h>
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#include <sys/syscall.h>
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#include "termcap.h"
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#include "pathnames.h"
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/*
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* termcap - routines for dealing with the terminal capability data base
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*
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* BUG: Should use a "last" pointer in tbuf, so that searching
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* for capabilities alphabetically would not be a n**2/2
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* process when large numbers of capabilities are given.
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* Note: If we add a last pointer now we will screw up the
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* tc capability. We really should compile termcap.
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*
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* Essentially all the work here is scanning and decoding escapes
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* in string capabilities. We don't use stdio because the editor
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* doesn't, and because living w/o it is not hard.
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*/
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static char *tbuf; /* termcap buffer */
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static int use_issetugid = 1; /* 0 = not present, 1 = try it, 2 = exists */
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/*
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* Get an entry for terminal name in buffer bp from the termcap file.
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*/
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int
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tgetent(char *bp, const char *name)
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{
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register char *p;
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register char *cp;
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char *dummy;
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char **fname;
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char *home;
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int i;
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char pathbuf[PBUFSIZ]; /* holds raw path of filenames */
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char *pathvec[PVECSIZ]; /* to point to names in pathbuf */
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char **pvec; /* holds usable tail of path vector */
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char *termpath;
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struct termios tty;
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dummy = NULL;
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fname = pathvec;
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pvec = pathvec;
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tbuf = bp;
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p = pathbuf;
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cp = getenv("TERMCAP");
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/*
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* TERMCAP can have one of two things in it. It can be the
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* name of a file to use instead of /etc/termcap. In this
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* case it better start with a "/". Or it can be an entry to
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* use so we don't have to read the file. In this case it
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* has to already have the newlines crunched out. If TERMCAP
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* does not hold a file name then a path of names is searched
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* instead. The path is found in the TERMPATH variable, or
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* becomes "$HOME/.termcap /etc/termcap" if no TERMPATH exists.
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*/
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if (!cp || *cp != '/') { /* no TERMCAP or it holds an entry */
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if ( (termpath = getenv("TERMPATH")) )
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strncpy(pathbuf, termpath, PBUFSIZ);
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else {
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if ( (home = getenv("HOME")) ) {/* set up default */
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strncpy(pathbuf, home, PBUFSIZ - 1); /* $HOME first */
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pathbuf[PBUFSIZ - 2] = '\0'; /* -2 because we add a slash */
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p += strlen(pathbuf); /* path, looking in */
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*p++ = '/';
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} /* if no $HOME look in current directory */
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strncpy(p, _PATH_DEF, PBUFSIZ - (p - pathbuf));
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}
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}
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else /* user-defined name in TERMCAP */
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strncpy(pathbuf, cp, PBUFSIZ); /* still can be tokenized */
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pathbuf[PBUFSIZ - 1] = '\0';
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#ifdef SYS_issetugid
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/*
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* This stuff is to try and detect the presence of the issetugid()
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* syscall without breaking dynamic linking during compiles.. Sigh.
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*/
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othersyscall:
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if (use_issetugid) {
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struct sigaction sa, osa;
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int sigsys_installed = 0;
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int unsafe;
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if (use_issetugid == 1) {
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bzero(&sa, sizeof(sa));
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sa.sa_handler = SIG_IGN;
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if (sigaction(SIGSYS, &sa, &osa) >= 0)
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sigsys_installed = 1;
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}
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errno = 0;
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unsafe = syscall(SYS_issetugid);
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if (sigsys_installed == 1) {
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int oerrno = errno;
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sigaction(SIGSYS, &osa, NULL);
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errno = oerrno;
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}
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if (errno == ENOSYS || errno == EINVAL) {
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use_issetugid = 0;
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goto othersyscall;
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} else if (sigsys_installed == 1)
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sigsys_installed = 2;
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if (unsafe)
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strcpy(pathbuf, _PATH_DEF_SEC);
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} else
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#endif /* SYS_issetugid */
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/* issetugid() not in kernel or undefined - try second best */
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if (getuid() != geteuid() || getgid() != getegid())
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strcpy(pathbuf, _PATH_DEF_SEC);
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*fname++ = pathbuf; /* tokenize path into vector of names */
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while (*++p)
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if (*p == ' ' || *p == ':') {
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*p = '\0';
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while (*++p)
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if (*p != ' ' && *p != ':')
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break;
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if (*p == '\0')
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break;
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*fname++ = p;
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if (fname >= pathvec + PVECSIZ) {
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fname--;
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break;
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}
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}
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*fname = (char *) 0; /* mark end of vector */
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if (cp && *cp && *cp != '/')
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if (cgetset(cp) < 0)
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return(-2);
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i = cgetent(&dummy, pathvec, (char *)name);
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if (i == 0) {
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char *pd, *ps, *tok, *s, *tcs;
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size_t len;
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pd = bp;
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ps = dummy;
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if ((tok = strchr(ps, ':')) == NULL) {
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len = strlen(ps);
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if (len >= TBUFSIZ)
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i = -1;
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else
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strcpy(pd, ps);
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goto done;
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}
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len = tok - ps + 1;
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if (pd + len + 1 - bp >= TBUFSIZ) {
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i = -1;
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goto done;
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}
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memcpy(pd, ps, len);
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ps += len;
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pd += len;
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*pd = '\0';
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tcs = pd - 1;
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for (;;) {
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while ((tok = strsep(&ps, ":")) != NULL &&
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(*tok == '\0' || *tok == '\\' || !isgraph(*tok)))
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;
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if (tok == NULL)
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break;
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for (s = tcs; s != NULL && s[1] != '\0'; s = strchr(s, ':')) {
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s++;
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if (s[0] == tok[0] && s[1] == tok[1])
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goto skip_it;
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}
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len = strlen(tok);
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if (pd + len + 1 - bp >= TBUFSIZ) {
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i = -1;
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break;
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}
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memcpy(pd, tok, len);
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pd += len;
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*pd++ = ':';
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*pd = '\0';
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skip_it: ;
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}
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}
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done:
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if ( i == 0
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&& ( tcgetattr(STDERR_FILENO, &tty) != -1
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|| tcgetattr(STDOUT_FILENO, &tty) != -1
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)
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)
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__set_ospeed(cfgetospeed(&tty));
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if (dummy)
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free(dummy);
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/* no tc reference loop return code in libterm XXX */
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if (i == -3)
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return(-1);
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return(i + 1);
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}
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/*
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* Return the (numeric) option id.
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* Numeric options look like
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* li#80
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* i.e. the option string is separated from the numeric value by
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* a # character. If the option is not found we return -1.
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* Note that we handle octal numbers beginning with 0.
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*/
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int
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tgetnum(const char *id)
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{
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long num;
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if (cgetnum(tbuf, (char *)id, &num) == 0)
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return(num);
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else
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return(-1);
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}
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/*
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* Handle a flag option.
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* Flag options are given "naked", i.e. followed by a : or the end
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* of the buffer. Return 1 if we find the option, or 0 if it is
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* not given.
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*/
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int
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tgetflag(const char *id)
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{
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return(cgetcap(tbuf, (char *)id, ':') != NULL);
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}
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/*
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* Get a string valued option.
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* These are given as
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* cl=^Z
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* Much decoding is done on the strings, and the strings are
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* placed in area, which is a ref parameter which is updated.
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* No checking on area overflow.
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*/
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char *
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tgetstr(const char *id, char **area)
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{
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char ids[3];
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char *s;
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int i;
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/*
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* XXX
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* This is for all the boneheaded programs that relied on tgetstr
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* to look only at the first 2 characters of the string passed...
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*/
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*ids = *id;
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ids[1] = id[1];
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ids[2] = '\0';
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if ((i = cgetstr(tbuf, ids, &s)) < 0)
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return NULL;
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strcpy(*area, s);
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*area += i + 1;
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return(s);
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}
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