write_entry.c

ncurses-5.4

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 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
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/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <[e-mail]> 1992,1995               *
 *     and: Eric S. Raymond <[e-mail]>                         *
 ****************************************************************************/

/*
 *	write_entry.c -- write a terminfo structure onto the file system
 */

#include <curses.priv.h>

#include <sys/stat.h>

#include <tic.h>
#include <term_entry.h>

#ifndef S_ISDIR
#define S_ISDIR(mode) ((mode & S_IFMT) == S_IFDIR)
#endif

#if 0
#define TRACE_OUT(p) DEBUG(2, p)
#else
#define TRACE_OUT(p)		/*nothing */
#endif

MODULE_ID("$Id: write_entry.c,v 1.58 2002/04/21 20:35:08 tom Exp $")

static int total_written;

static int write_object(FILE *, TERMTYPE *);

static void
write_file(char *filename, TERMTYPE * tp)
{
    FILE *fp = (_nc_access(filename, W_OK) == 0) ? fopen(filename, "wb") : 0;
    if (fp == 0) {
	perror(filename);
	_nc_syserr_abort("can't open %s/%s", _nc_tic_dir(0), filename);
    }
    DEBUG(1, ("Created %s", filename));

    if (write_object(fp, tp) == ERR) {
	_nc_syserr_abort("error writing %s/%s", _nc_tic_dir(0), filename);
    }
    fclose(fp);
}

/*
 *	make_directory(char *path)
 *
 *	Make a directory if it doesn't exist.
 */
static int
make_directory(const char *path)
{
    int rc;
    struct stat statbuf;
    char fullpath[PATH_MAX];
    const char *destination = _nc_tic_dir(0);

    if (path == destination || *path == '/') {
	if (strlen(path) + 1 > sizeof(fullpath))
	    return (-1);
	(void) strcpy(fullpath, path);
    } else {
	if (strlen(destination) + strlen(path) + 2 > sizeof(fullpath))
	    return (-1);
	(void) sprintf(fullpath, "%s/%s", destination, path);
    }

    if ((rc = stat(path, &statbuf)) < 0) {
	rc = mkdir(path, 0777);
    } else {
	if (_nc_access(path, R_OK | W_OK | X_OK) < 0) {
	    rc = -1;		/* permission denied */
	} else if (!(S_ISDIR(statbuf.st_mode))) {
	    rc = -1;		/* not a directory */
	}
    }
    return rc;
}

NCURSES_EXPORT(void)
_nc_set_writedir(char *dir)
/* set the write directory for compiled entries */
{
    const char *destination;
    char actual[PATH_MAX];

    if (dir == 0
	&& use_terminfo_vars())
	dir = getenv("TERMINFO");

    if (dir != 0)
	(void) _nc_tic_dir(dir);

    destination = _nc_tic_dir(0);
    if (make_directory(destination) < 0) {
	char *home = _nc_home_terminfo();

	if (home != 0) {
	    destination = home;
	    if (make_directory(destination) < 0)
		_nc_err_abort("%s: permission denied (errno %d)",
			      destination, errno);
	}
    }

    /*
     * Note: because of this code, this logic should be exercised
     * *once only* per run.
     */
    if (chdir(_nc_tic_dir(destination)) < 0
	|| getcwd(actual, sizeof(actual)) == 0)
	_nc_err_abort("%s: not a directory", destination);
    _nc_keep_tic_dir(strdup(actual));
}

/*
 *	check_writeable(char code)
 *
 *	Miscellaneous initialisations
 *
 *	Check for access rights to destination directories
 *	Create any directories which don't exist.
 *	Note: there's no reason to return the result of make_directory(), since
 *	this function is called only in instances where that has to succeed.
 *
 */

static void
check_writeable(int code)
{
    static const char dirnames[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
    static bool verified[sizeof(dirnames)];

    char dir[2];
    char *s = 0;

    if (code == 0 || (s = strchr(dirnames, code)) == 0)
	_nc_err_abort("Illegal terminfo subdirectory \"%c\"", code);

    if (verified[s - dirnames])
	return;

    dir[0] = code;
    dir[1] = '\0';
    if (make_directory(dir) < 0) {
	_nc_err_abort("%s/%s: permission denied", _nc_tic_dir(0), dir);
    }

    verified[s - dirnames] = TRUE;
}

/*
 *	_nc_write_entry()
 *
 *	Save the compiled version of a description in the filesystem.
 *
 *	make a copy of the name-list
 *	break it up into first-name and all-but-last-name
 *	creat(first-name)
 *	write object information to first-name
 *	close(first-name)
 *      for each name in all-but-last-name
 *	    link to first-name
 *
 *	Using 'time()' to obtain a reference for file timestamps is unreliable,
 *	e.g., with NFS, because the filesystem may have a different time
 *	reference.  We check for pre-existence of links by latching the first
 *	timestamp from a file that we create.
 *
 *	The _nc_warning() calls will report a correct line number only if
 *	_nc_curr_line is properly set before the write_entry() call.
 */

void
_nc_write_entry(TERMTYPE * const tp)
{
    struct stat statbuf;
    char name_list[MAX_TERMINFO_LENGTH];
    char *first_name, *other_names;
    char *ptr;
    char filename[PATH_MAX];
    char linkname[PATH_MAX];
#if USE_SYMLINKS
    char symlinkname[PATH_MAX];
#if !HAVE_LINK
#undef HAVE_LINK
#define HAVE_LINK 1
#endif
#endif /* USE_SYMLINKS */
    static int call_count;
    static time_t start_time;	/* time at start of writes */

    if (call_count++ == 0) {
	start_time = 0;
    }

    (void) strcpy(name_list, tp->term_names);
    DEBUG(7, ("Name list = '%s'", name_list));

    first_name = name_list;

    ptr = &name_list[strlen(name_list) - 1];
    other_names = ptr + 1;

    while (ptr > name_list && *ptr != '|')
	ptr--;

    if (ptr != name_list) {
	*ptr = '\0';

	for (ptr = name_list; *ptr != '\0' && *ptr != '|'; ptr++)
	    continue;

	if (*ptr == '\0')
	    other_names = ptr;
	else {
	    *ptr = '\0';
	    other_names = ptr + 1;
	}
    }

    DEBUG(7, ("First name = '%s'", first_name));
    DEBUG(7, ("Other names = '%s'", other_names));

    _nc_set_type(first_name);

    if (strlen(first_name) > sizeof(filename) - 3)
	_nc_warning("terminal name too long.");

    sprintf(filename, "%c/%s", first_name[0], first_name);

    /*
     * Has this primary name been written since the first call to
     * write_entry()?  If so, the newer write will step on the older,
     * so warn the user.
     */
    if (start_time > 0 &&
	stat(filename, &statbuf) >= 0
	&& statbuf.st_mtime >= start_time) {
	_nc_warning("name multiply defined.");
    }

    check_writeable(first_name[0]);
    write_file(filename, tp);

    if (start_time == 0) {
	if (stat(filename, &statbuf) < 0
	    || (start_time = statbuf.st_mtime) == 0) {
	    _nc_syserr_abort("error obtaining time from %s/%s",
			     _nc_tic_dir(0), filename);
	}
    }
    while (*other_names != '\0') {
	ptr = other_names++;
	while (*other_names != '|' && *other_names != '\0')
	    other_names++;

	if (*other_names != '\0')
	    *(other_names++) = '\0';

	if (strlen(ptr) > sizeof(linkname) - 3) {
	    _nc_warning("terminal alias %s too long.", ptr);
	    continue;
	}