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|
/* $NetBSD: termcap.c,v 1.36 2000/06/03 07:14:55 blymn Exp $ */
/*
* Copyright (c) 1980, 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.
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)termcap.c 8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: termcap.c,v 1.36 2000/06/03 07:14:55 blymn Exp $");
#endif
#endif /* not lint */
#define PBUFSIZ 512 /* max length of filename path */
#define PVECSIZ 32 /* max number of names in path */
#include <assert.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termcap.h>
#include <errno.h>
#include "pathnames.h"
#include "termcap_private.h"
/*
* termcap - routines for dealing with the terminal capability data base
*
* BUG: Should use a "last" pointer in tbuf, so that searching
* for capabilities alphabetically would not be a n**2/2
* process when large numbers of capabilities are given.
* Note: If we add a last pointer now we will screw up the
* tc capability. We really should compile termcap.
*
* Essentially all the work here is scanning and decoding escapes
* in string capabilities. We don't use stdio because the editor
* doesn't, and because living w/o it is not hard.
*/
static char *tbuf; /* termcap buffer */
static struct tinfo *fbuf; /* untruncated termcap buffer */
/*
* Set the termcap entry to the arbitrary string passed in, this can
* be used to provide a "dummy" termcap entry if a real one does not
* exist. This function will malloc the buffer and space for the
* string. If an error occurs return -1 otherwise return 0.
*/
int
t_setinfo(struct tinfo **bp, const char *entry)
{
char capability[256], *cap_ptr;
size_t limit;
if ((*bp = malloc(sizeof(struct tinfo))) == NULL)
return -1;
if (((*bp)->info = (char *) malloc(strlen(entry) + 1)) == NULL)
return -1;
strcpy((*bp)->info, entry);
cap_ptr = capability;
limit = 255;
(*bp)->up = t_getstr(*bp, "up", &cap_ptr, &limit);
cap_ptr = capability;
limit = 255;
(*bp)->bc = t_getstr(*bp, "bc", &cap_ptr, &limit);
return 0;
}
/*
* Get an extended entry for the terminal name. This differs from
* tgetent only in a) the buffer is malloc'ed for the caller and
* b) the termcap entry is not truncated to 1023 characters.
*/
int
t_getent(bp, name)
struct tinfo **bp;
const char *name;
{
char *p;
char *cp;
char **fname;
char *home;
int i, did_getset;
size_t limit;
char pathbuf[PBUFSIZ]; /* holds raw path of filenames */
char *pathvec[PVECSIZ]; /* to point to names in pathbuf */
char *termpath;
char capability[256], *cap_ptr;
_DIAGASSERT(bp != NULL);
_DIAGASSERT(name != NULL);
if ((*bp = malloc(sizeof(struct tinfo))) == NULL) return 0;
fname = pathvec;
p = pathbuf;
cp = getenv("TERMCAP");
/*
* TERMCAP can have one of two things in it. It can be the
* name of a file to use instead of
* /usr/share/misc/termcap. In this case it better start with
* a "/". Or it can be an entry to use so we don't have to
* read the file. In this case cgetset() withh crunch out the
* newlines. If TERMCAP does not hold a file name then a path
* of names is searched instead. The path is found in the
* TERMPATH variable, or becomes _PATH_DEF ("$HOME/.termcap
* /usr/share/misc/termcap") if no TERMPATH exists.
*/
if (!cp || *cp != '/') { /* no TERMCAP or it holds an entry */
if ((termpath = getenv("TERMPATH")) != NULL)
strncpy(pathbuf, termpath, PBUFSIZ);
else {
if ((home = getenv("HOME")) != NULL) {
/* set up default */
p += strlen(home); /* path, looking in */
(void)strncpy(pathbuf, home,
sizeof(pathbuf) - 1); /* $HOME first */
*p++ = '/';
} /* if no $HOME look in current directory */
strncpy(p, _PATH_DEF, PBUFSIZ - (size_t)(p - pathbuf));
}
}
else /* user-defined name in TERMCAP */
strncpy(pathbuf, cp, PBUFSIZ); /* still can be tokenized */
*fname++ = pathbuf; /* tokenize path into vector of names */
while (*++p)
if (*p == ' ' || *p == ':') {
*p = '\0';
while (*++p)
if (*p != ' ' && *p != ':')
break;
if (*p == '\0')
break;
*fname++ = p;
if (fname >= pathvec + PVECSIZ) {
fname--;
break;
}
}
*fname = (char *) 0; /* mark end of vector */
/*
* try ignoring TERMCAP if it has a ZZ in it, we do this
* because a TERMCAP with ZZ in it indicates the entry has been
* exported by another program using the "old" interface, the
* termcap entry has been truncated and ZZ points to an address
* in the exporting programs memory space which is of no use
* here - anyone who is exporting the termcap entry and then
* reading it back again in the same program deserves to be
* taken out, beaten up, dragged about, shot and then hurt some
* more.
*/
did_getset = 0;
if (cp && *cp && *cp != '/' && strstr(cp, ":ZZ") == NULL) {
did_getset = 1;
if (cgetset(cp) < 0)
return (-2);
}
/*
* XXX potential security hole here in a set-id program if the
* user had setup name to be built from a path they can not
* normally read.
*/
(*bp)->info = NULL;
i = cgetent(&((*bp)->info), pathvec, name);
/*
* if we get an error and we skipped doing the cgetset before
* we try with TERMCAP in place - we may be using a truncated
* termcap entry but what else can one do?
*/
if ((i < 0) && (did_getset == 0)) {
if (cp && *cp && *cp != '/')
if (cgetset(cp) < 0)
return (-2);
i = cgetent(&((*bp)->info), pathvec, name);
}
/* no tc reference loop return code in libterm XXX */
if (i == -3)
return (-1);
/* fill in t_goto capabilities - this prevents memory leaks
* and is more efficient than fetching these capabilities
* every time t_goto is called.
*/
if (i >= 0) {
cap_ptr = capability;
limit = 255;
(*bp)->up = t_getstr(*bp, "up", &cap_ptr, &limit);
cap_ptr = capability;
limit = 255;
(*bp)->bc = t_getstr(*bp, "bc", &cap_ptr, &limit);
}
return (i + 1);
}
/*
* Get an entry for terminal name in buffer bp from the termcap file.
*/
int
tgetent(bp, name)
char *bp;
const char *name;
{
int i, plen, elen, c;
char *ptrbuf = NULL;
i = t_getent(&fbuf, name);
if (i == 1) {
/*
* stash the full buffer pointer as the ZZ capability
* in the termcap buffer passed.
*/
plen = asprintf(&ptrbuf, ":ZZ=%p", fbuf->info);
strncpy(bp, fbuf->info, 1024);
bp[1023] = '\0';
elen = strlen(bp);
/*
* backup over the entry if the addition of the full
* buffer pointer will overflow the buffer passed. We
* want to truncate the termcap entry on a capability
* boundary.
*/
if ((elen + plen) > 1023) {
bp[1023 - plen] = '\0';
for (c = (elen - plen); c > 0; c--) {
if (bp[c] == ':') {
bp[c] = '\0';
break;
}
}
}
strcat(bp, ptrbuf);
tbuf = bp;
}
return i;
}
/*
* 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.
*/
int
t_getnum(info, id)
struct tinfo *info;
const char *id;
{
long num;
_DIAGASSERT(info != NULL);
_DIAGASSERT(id != NULL);
if (cgetnum(info->info, id, &num) == 0)
return (int)(num);
else
return (-1);
}
int
tgetnum(id)
const char *id;
{
return t_getnum(fbuf, id);
}
/*
* 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.
*/
int t_getflag(info, id)
struct tinfo *info;
const char *id;
{
_DIAGASSERT(info != NULL);
_DIAGASSERT(id != NULL);
return (cgetcap(info->info, id, ':') != NULL);
}
int
tgetflag(id)
const char *id;
{
return t_getflag(fbuf, id);
}
/*
* 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.
* limit is the number of characters allowed to be put into
* area, this is updated.
*
* returns dynamically allocated region, passed from cgetstr().
*/
char *
t_getstr(info, id, area, limit)
struct tinfo *info;
const char *id;
char **area;
size_t *limit;
{
char *s;
int i;
_DIAGASSERT(info != NULL);
_DIAGASSERT(id != NULL);
/* area may be NULL */
if ((i = cgetstr(info->info, id, &s)) < 0) {
errno = ENOENT;
if ((area == NULL) && (limit != NULL))
*limit = 0;
return NULL;
}
if (area != NULL) {
/*
* check if there is room for the new entry to be put into
* area
*/
if (limit != NULL && (*limit < i)) {
errno = E2BIG;
free(s);
return NULL;
}
strcpy(*area, s);
*area += i + 1;
if (limit != NULL) *limit -= i;
return (s);
} else {
_DIAGASSERT(limit != NULL);
*limit = i;
free(s);
return NULL;
}
}
/*
* 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 *
tgetstr(id, area)
const char *id;
char **area;
{
struct tinfo dummy;
char ids[3];
_DIAGASSERT(id != NULL);
/*
* XXX
* This is for all the boneheaded programs that relied on tgetstr
* to look only at the first 2 characters of the string passed...
*/
ids[0] = id[0];
ids[1] = id[1];
ids[2] = '\0';
if ((id[0] == 'Z') && (id[1] == 'Z')) {
dummy.info = tbuf;
return t_getstr(&dummy, ids, area, NULL);
}
else
return t_getstr(fbuf, ids, area, NULL);
}
/*
* Get a string valued option specified by id and append it to the
* given buffer. If bufptr is NULL then a new buffer is allocated, if
* bufptr is non-NULL then extend the memory allocation to allow the
* new string to be appended to the buffer. The pointer area is
* updated to point to the start of the new entry and this address is
* also returned to the caller. If the string is not found or a
* memory allocation fails then NULL is returned and bufptr and area
* are unchanged.
*/
char *
t_agetstr(struct tinfo *info, const char *id, char **bufptr, char **area)
{
size_t new_size, offset;
char *new_buf;
_DIAGASSERT(info != NULL);
_DIAGASSERT(id != NULL);
_DIAGASSERT(bufptr != NULL);
_DIAGASSERT(area != NULL);
t_getstr(info, id, NULL, &new_size);
/* either the string is empty or the capability does not exist. */
if (new_size == 0)
return NULL;
/* check if we have a buffer, if not malloc one and fill it in. */
if (*bufptr == NULL) {
if ((new_buf = (char *) malloc(new_size)) == NULL)
return NULL;
*bufptr = new_buf;
*area = new_buf;
} else {
offset = *area - *bufptr;
if ((new_buf = realloc(*bufptr, offset + new_size)) == NULL)
return NULL;
*bufptr = new_buf;
*area = *bufptr + offset; /* we need to do this just in case
realloc shifted the buffer. */
}
return t_getstr(info, id, area, NULL);
}
/*
* Free the buffer allocated by t_getent
*
*/
void
t_freent(info)
struct tinfo *info;
{
_DIAGASSERT(info != NULL);
free(info->info);
if (info->up != NULL)
free(info->up);
if (info->bc != NULL)
free(info->bc);
free(info);
}
/*
* Get the terminal name string from the termcap entry.
*
*/
int
t_getterm(info, area, limit)
struct tinfo *info;
char **area;
size_t *limit;
{
char *endp;
size_t count;
_DIAGASSERT(info != NULL);
if ((endp = strchr(info->info, ':')) == NULL) {
errno = EINVAL;
return -1;
}
count = endp - info->info + 1;
if (area == NULL) {
_DIAGASSERT(limit != NULL);
*limit = count;
return 0;
} else {
if ((limit != NULL) && (count > *limit)) {
errno = E2BIG;
return -1;
}
strncpy(*area, info->info, count);
(*area)[count] = '\0';
if (limit != NULL)
*limit -= count;
}
return 0;
}
|