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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/mg/fileio.c	Lines:	0	318	0.0 %
Date:	2017-11-07	Branches:	0	253	0.0 %


/*	$OpenBSD: fileio.c,v 1.104 2017/05/30 07:05:22 florian Exp $	*/

/* This file is in the public domain. */

/*
 *	POSIX fileio.c
 */

#include <sys/queue.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "def.h"
#include "kbd.h"
#include "pathnames.h"

static char *bkuplocation(const char *);
static int   bkupleavetmp(const char *);

static char *bkupdir;
static int   leavetmp = 0;	/* 1 = leave any '~' files in tmp dir */

/*
 * Open a file for reading.
 */
int
ffropen(FILE ** ffp, const char *fn, struct buffer *bp)
{
	if ((*ffp = fopen(fn, "r")) == NULL) {
		if (errno == ENOENT)
			return (FIOFNF);
		return (FIOERR);
	}

	/* If 'fn' is a directory open it with dired. */
	if (fisdir(fn) == TRUE)
		return (FIODIR);

	ffstat(*ffp, bp);

	return (FIOSUC);
}

/*
 * Update stat/dirty info
 */
void
ffstat(FILE *ffp, struct buffer *bp)
{
	struct stat	sb;

	if (bp && fstat(fileno(ffp), &sb) == 0) {
		/* set highorder bit to make sure this isn't all zero */
		bp->b_fi.fi_mode = sb.st_mode | 0x8000;
		bp->b_fi.fi_uid = sb.st_uid;
		bp->b_fi.fi_gid = sb.st_gid;
		bp->b_fi.fi_mtime = sb.st_mtimespec;
		/* Clear the ignore flag */
		bp->b_flag &= ~(BFIGNDIRTY | BFDIRTY);
	}
}

/*
 * Update the status/dirty info. If there is an error,
 * there's not a lot we can do.
 */
int
fupdstat(struct buffer *bp)
{
	FILE *ffp;

	if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
		if (errno == ENOENT)
			return (FIOFNF);
		return (FIOERR);
	}
	ffstat(ffp, bp);
	(void)ffclose(ffp, bp);
	return (FIOSUC);
}

/*
 * Open a file for writing.
 */
int
ffwopen(FILE ** ffp, const char *fn, struct buffer *bp)
{
	int	fd;
	mode_t	fmode = DEFFILEMODE;

	if (bp && bp->b_fi.fi_mode)
		fmode = bp->b_fi.fi_mode & 07777;

	fd = open(fn, O_RDWR | O_CREAT | O_TRUNC, fmode);
	if (fd == -1) {
		ffp = NULL;
		dobeep();
		ewprintf("Cannot open file for writing : %s", strerror(errno));
		return (FIOERR);
	}

	if ((*ffp = fdopen(fd, "w")) == NULL) {
		dobeep();
		ewprintf("Cannot open file for writing : %s", strerror(errno));
		close(fd);
		return (FIOERR);
	}

	/*
	 * If we have file information, use it.  We don't bother to check for
	 * errors, because there's no a lot we can do about it.  Certainly
	 * trying to change ownership will fail if we aren't root.  That's
	 * probably OK.  If we don't have info, no need to get it, since any
	 * future writes will do the same thing.
	 */
	if (bp && bp->b_fi.fi_mode) {
		fchmod(fd, bp->b_fi.fi_mode & 07777);
		fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
	}
	return (FIOSUC);
}

/*
 * Close a file.
 */
/* ARGSUSED */
int
ffclose(FILE *ffp, struct buffer *bp)
{
	if (fclose(ffp) == 0)
		return (FIOSUC);
	return (FIOERR);
}

/*
 * Write a buffer to the already opened file. bp points to the
 * buffer. Return the status.
 */
int
ffputbuf(FILE *ffp, struct buffer *bp)
{
	struct line   *lp, *lpend;

	lpend = bp->b_headp;
	for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
		if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
			dobeep();
			ewprintf("Write I/O error");
			return (FIOERR);
		}
		if (lforw(lp) != lpend)		/* no implied \n on last line */
			putc('\n', ffp);
	}
	/*
	 * XXX should be variable controlled (once we have variables)
	 */
	if (llength(lback(lpend)) != 0) {
		if (eyorn("No newline at end of file, add one") == TRUE) {
			lnewline_at(lback(lpend), llength(lback(lpend)));
			putc('\n', ffp);
		}
	}
	return (FIOSUC);
}

/*
 * Read a line from a file, and store the bytes
 * in the supplied buffer. Stop on end of file or end of
 * line.  When FIOEOF is returned, there is a valid line
 * of data without the normally implied \n.
 * If the line length exceeds nbuf, FIOLONG is returned.
 */
int
ffgetline(FILE *ffp, char *buf, int nbuf, int *nbytes)
{
	int	c, i;

	i = 0;
	while ((c = getc(ffp)) != EOF && c != '\n') {
		buf[i++] = c;
		if (i >= nbuf)
			return (FIOLONG);
	}
	if (c == EOF && ferror(ffp) != FALSE) {
		dobeep();
		ewprintf("File read error");
		return (FIOERR);
	}
	*nbytes = i;
	return (c == EOF ? FIOEOF : FIOSUC);
}

/*
 * Make a backup copy of "fname".  On Unix the backup has the same
 * name as the original file, with a "~" on the end; this seems to
 * be newest of the new-speak. The error handling is all in "file.c".
 * We do a copy instead of a rename since otherwise another process
 * with an open fd will get the backup, not the new file.  This is
 * a problem when using mg with things like crontab and vipw.
 */
int
fbackupfile(const char *fn)
{
	struct stat	 sb;
	struct timespec	 new_times[2];
	int		 from, to, serrno;
	ssize_t		 nread;
	char		 buf[BUFSIZ];
	char		*nname, *tname, *bkpth;

	if (stat(fn, &sb) == -1) {
		dobeep();
		ewprintf("Can't stat %s : %s", fn, strerror(errno));
		return (FALSE);
	}

	if ((bkpth = bkuplocation(fn)) == NULL)
		return (FALSE);

	if (asprintf(&nname, "%s~", bkpth) == -1) {
		dobeep();
		ewprintf("Can't allocate backup file name : %s", strerror(errno));
		free(bkpth);
		return (ABORT);
	}
	if (asprintf(&tname, "%s.XXXXXXXXXX", bkpth) == -1) {
		dobeep();
		ewprintf("Can't allocate temp file name : %s", strerror(errno));
		free(bkpth);
		free(nname);
		return (ABORT);
	}
	free(bkpth);

	if ((from = open(fn, O_RDONLY)) == -1) {
		free(nname);
		free(tname);
		return (FALSE);
	}
	to = mkstemp(tname);
	if (to == -1) {
		serrno = errno;
		close(from);
		free(nname);
		free(tname);
		errno = serrno;
		return (FALSE);
	}
	while ((nread = read(from, buf, sizeof(buf))) > 0) {
		if (write(to, buf, (size_t)nread) != nread) {
			nread = -1;
			break;
		}
	}
	serrno = errno;
	(void) fchmod(to, (sb.st_mode & 0777));

	/* copy the mtime to the backupfile */
	new_times[0] = sb.st_atim;
	new_times[1] = sb.st_mtim;
	futimens(to, new_times);

	close(from);
	close(to);
	if (nread == -1) {
		if (unlink(tname) == -1)
			ewprintf("Can't unlink temp : %s", strerror(errno));
	} else {
		if (rename(tname, nname) == -1) {
			ewprintf("Can't rename temp : %s", strerror(errno));
			(void) unlink(tname);
			nread = -1;
		}
	}
	free(nname);
	free(tname);
	errno = serrno;

	return (nread == -1 ? FALSE : TRUE);
}

/*
 * Convert "fn" to a canonicalized absolute filename, replacing
 * a leading ~/ with the user's home dir, following symlinks, and
 * remove all occurrences of /./ and /../
 */
char *
adjustname(const char *fn, int slashslash)
{
	static char	 fnb[PATH_MAX];
	const char	*cp, *ep = NULL;
	char		*path;

	if (slashslash == TRUE) {
		cp = fn + strlen(fn) - 1;
		for (; cp >= fn; cp--) {
			if (ep && (*cp == '/')) {
				fn = ep;
				break;
			}
			if (*cp == '/' || *cp == '~')
				ep = cp;
			else
				ep = NULL;
		}
	}
	if ((path = expandtilde(fn)) == NULL)
		return (NULL);

	if (realpath(path, fnb) == NULL)
		(void)strlcpy(fnb, path, sizeof(fnb));

	free(path);
	return (fnb);
}

/*
 * Find a startup file for the user and return its name. As a service
 * to other pieces of code that may want to find a startup file (like
 * the terminal driver in particular), accepts a suffix to be appended
 * to the startup file name.
 */
char *
startupfile(char *suffix)
{
	static char	 file[NFILEN];
	char		*home;
	int		 ret;

	if ((home = getenv("HOME")) == NULL || *home == '\0')
		goto nohome;

	if (suffix == NULL) {
		ret = snprintf(file, sizeof(file), _PATH_MG_STARTUP, home);
		if (ret < 0 || ret >= sizeof(file))
			return (NULL);
	} else {
		ret = snprintf(file, sizeof(file), _PATH_MG_TERM, home, suffix);
		if (ret < 0 || ret >= sizeof(file))
			return (NULL);
	}

	if (access(file, R_OK) == 0)
		return (file);
nohome:
#ifdef STARTUPFILE
	if (suffix == NULL) {
		ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
		if (ret < 0 || ret >= sizeof(file))
			return (NULL);
	} else {
		ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
		    suffix);
		if (ret < 0 || ret >= sizeof(file))
			return (NULL);
	}

	if (access(file, R_OK) == 0)
		return (file);
#endif /* STARTUPFILE */
	return (NULL);
}

int
copy(char *frname, char *toname)
{
	int	ifd, ofd;
	char	buf[BUFSIZ];
	mode_t	fmode = DEFFILEMODE;	/* XXX?? */
	struct	stat orig;
	ssize_t	sr;

	if ((ifd = open(frname, O_RDONLY)) == -1)
		return (FALSE);
	if (fstat(ifd, &orig) == -1) {
		dobeep();
		ewprintf("fstat: %s", strerror(errno));
		close(ifd);
		return (FALSE);
	}

	if ((ofd = open(toname, O_WRONLY|O_CREAT|O_TRUNC, fmode)) == -1) {
		close(ifd);
		return (FALSE);
	}
	while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
		if (write(ofd, buf, (size_t)sr) != sr) {
			ewprintf("write error : %s", strerror(errno));
			break;
		}
	}
	if (fchmod(ofd, orig.st_mode) == -1)
		ewprintf("Cannot set original mode : %s", strerror(errno));

	if (sr == -1) {
		ewprintf("Read error : %s", strerror(errno));
		close(ifd);
		close(ofd);
		return (FALSE);
	}
	/*
	 * It is "normal" for this to fail since we can't guarantee that
	 * we will be running as root.
	 */
	if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
		ewprintf("Cannot set owner : %s", strerror(errno));

	(void) close(ifd);
	(void) close(ofd);

	return (TRUE);
}

/*
 * return list of file names that match the name in buf.
 */
struct list *
make_file_list(char *buf)
{
	char		*dir, *file, *cp;
	size_t		 len, preflen;
	int		 ret;
	DIR		*dirp;
	struct dirent	*dent;
	struct list	*last, *current;
	char		 fl_name[NFILEN + 2];
	char		 prefixx[NFILEN + 1];

	/*
	 * We need three different strings:

	 * dir - the name of the directory containing what the user typed.
	 *  Must be a real unix file name, e.g. no ~user, etc..
	 *  Must not end in /.
	 * prefix - the portion of what the user typed that is before the
	 *  names we are going to find in the directory.  Must have a
	 * trailing / if the user typed it.
	 * names from the directory - We open dir, and return prefix
	 * concatenated with names.
	 */

	/* first we get a directory name we can look up */
	/*
	 * Names ending in . are potentially odd, because adjustname will
	 * treat foo/bar/.. as a foo/, whereas we are
	 * interested in names starting with ..
	 */
	len = strlen(buf);
	if (len && buf[len - 1] == '.') {
		buf[len - 1] = 'x';
		dir = adjustname(buf, TRUE);
		buf[len - 1] = '.';
	} else
		dir = adjustname(buf, TRUE);
	if (dir == NULL)
		return (NULL);
	/*
	 * If the user typed a trailing / or the empty string
	 * he wants us to use his file spec as a directory name.
	 */
	if (len && buf[len - 1] != '/') {
		file = strrchr(dir, '/');
		if (file) {
			*file = '\0';
			if (*dir == '\0')
				dir = "/";
		} else
			return (NULL);
	}
	/* Now we get the prefix of the name the user typed. */
	if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
		return (NULL);
	cp = strrchr(prefixx, '/');
	if (cp == NULL)
		prefixx[0] = '\0';
	else
		cp[1] = '\0';

	preflen = strlen(prefixx);
	/* cp is the tail of buf that really needs to be compared. */
	cp = buf + preflen;
	len = strlen(cp);

	/*
	 * Now make sure that file names will fit in the buffers allocated.
	 * SV files are fairly short.  For BSD, something more general would
	 * be required.
	 */
	if (preflen > NFILEN - MAXNAMLEN)
		return (NULL);

	/* loop over the specified directory, making up the list of files */

	/*
	 * Note that it is worth our time to filter out names that don't
	 * match, even though our caller is going to do so again, and to
	 * avoid doing the stat if completion is being done, because stat'ing
	 * every file in the directory is relatively expensive.
	 */

	dirp = opendir(dir);
	if (dirp == NULL)
		return (NULL);
	last = NULL;

	while ((dent = readdir(dirp)) != NULL) {
		int isdir;
		if (strncmp(cp, dent->d_name, len) != 0)
			continue;
		isdir = 0;
		if (dent->d_type == DT_DIR) {
			isdir = 1;
		} else if (dent->d_type == DT_LNK ||
			    dent->d_type == DT_UNKNOWN) {
			struct stat	statbuf;

			if (fstatat(dirfd(dirp), dent->d_name, &statbuf, 0) < 0)
				continue;
			if (S_ISDIR(statbuf.st_mode))
				isdir = 1;
		}

		if ((current = malloc(sizeof(struct list))) == NULL) {
			free_file_list(last);
			closedir(dirp);
			return (NULL);
		}
		ret = snprintf(fl_name, sizeof(fl_name),
		    "%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
		if (ret < 0 || ret >= sizeof(fl_name)) {
			free(current);
			continue;
		}
		current->l_next = last;
		current->l_name = strdup(fl_name);
		last = current;
	}
	closedir(dirp);

	return (last);
}

/*
 * Test if a supplied filename refers to a directory
 * Returns ABORT on error, TRUE if directory. FALSE otherwise
 */
int
fisdir(const char *fname)
{
	struct stat	statbuf;

	if (stat(fname, &statbuf) != 0)
		return (ABORT);

	if (S_ISDIR(statbuf.st_mode))
		return (TRUE);

	return (FALSE);
}

/*
 * Check the mtime of the supplied filename.
 * Return TRUE if last mtime matches, FALSE if not,
 * If the stat fails, return TRUE and try the save anyway
 */
int
fchecktime(struct buffer *bp)
{
	struct stat sb;

	if (stat(bp->b_fname, &sb) == -1)
		return (TRUE);

	if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec ||
	    bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
		return (FALSE);

	return (TRUE);

}

/*
 * Location of backup file. This function creates the correct path.
 */
static char *
bkuplocation(const char *fn)
{
	struct stat sb;
	char *ret;

	if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
	    S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
		char fname[NFILEN];
		const char *c;
		int i = 0, len;

		c = fn;
		len = strlen(bkupdir);

		while (*c != '\0') {
			/* Make sure we don't go over combined:
		 	* strlen(bkupdir + '/' + fname + '\0')
		 	*/
			if (i >= NFILEN - len - 1)
				return (NULL);
			if (*c == '/') {
				fname[i] = '!';
			} else if (*c == '!') {
				if (i >= NFILEN - len - 2)
					return (NULL);
				fname[i++] = '!';
				fname[i] = '!';
			} else
				fname[i] = *c;
			i++;
			c++;
		}
		fname[i] = '\0';
		if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
			return (NULL);

	} else if ((ret = strndup(fn, NFILEN)) == NULL)
		return (NULL);

	return (ret);
}

int
backuptohomedir(int f, int n)
{
	const char	*c = _PATH_MG_DIR;
	char		*p;

	if (bkupdir == NULL) {
		p = adjustname(c, TRUE);
		bkupdir = strndup(p, NFILEN);
		if (bkupdir == NULL)
			return(FALSE);

		if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
			free(bkupdir);
			bkupdir = NULL;
		}
	} else {
		free(bkupdir);
		bkupdir = NULL;
	}

	return (TRUE);
}

/*
 * For applications that use mg as the editor and have a desire to keep
 * '~' files in /tmp, toggle the location: /tmp | ~/.mg.d
 */
int
toggleleavetmp(int f, int n)
{
	leavetmp = !leavetmp;

	return (TRUE);
}

/*
 * Returns TRUE if fn is located in the temp directory and we want to save
 * those backups there.
 */
int
bkupleavetmp(const char *fn)
{
	if (!leavetmp)
		return(FALSE);

	if (strncmp(fn, "/tmp", 4) == 0)
		return (TRUE);

	return (FALSE);
}

/*
 * Expand file names beginning with '~' if appropriate:
 *   1, if ./~fn exists, continue without expanding tilde.
 *   2, else, if username 'fn' exists, expand tilde with home directory path.
 *   3, otherwise, continue and create new buffer called ~fn.
 */
char *
expandtilde(const char *fn)
{
	struct passwd	*pw;
	struct stat	 statbuf;
	const char	*cp;
	char		 user[LOGIN_NAME_MAX], path[NFILEN];
	char		*un, *ret;
	size_t		 ulen, plen;

	path[0] = '\0';

	if (fn[0] != '~' || stat(fn, &statbuf) == 0) {
		if ((ret = strndup(fn, NFILEN)) == NULL)
			return (NULL);
		return(ret);
	}
	cp = strchr(fn, '/');
	if (cp == NULL)
		cp = fn + strlen(fn); /* point to the NUL byte */
	ulen = cp - &fn[1];
	if (ulen >= sizeof(user)) {
		if ((ret = strndup(fn, NFILEN)) == NULL)
			return (NULL);
		return(ret);
	}
	if (ulen == 0) { /* ~/ or ~ */
		if ((un = getlogin()) != NULL)
			(void)strlcpy(user, un, sizeof(user));
		else
			user[0] = '\0';
	} else { /* ~user/ or ~user */
		memcpy(user, &fn[1], ulen);
		user[ulen] = '\0';
	}
	pw = getpwnam(user);
	if (pw != NULL) {
		plen = strlcpy(path, pw->pw_dir, sizeof(path));
		if (plen == 0 || path[plen - 1] != '/') {
			if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
				dobeep();
				ewprintf("Path too long");
				return (NULL);
			}
		}
		fn = cp;
		if (*fn == '/')
			fn++;
	}
	if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
		dobeep();
		ewprintf("Path too long");
		return (NULL);
	}
	if ((ret = strndup(path, NFILEN)) == NULL)
		return (NULL);

	return (ret);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: fileio.c,v 1.104 2017/05/30 07:05:22 florian Exp $ */
2
3			/* This file is in the public domain. */
4
5			/*
6			* POSIX fileio.c
7			*/
8
9			#include <sys/queue.h>
10			#include <sys/resource.h>
11			#include <sys/stat.h>
12			#include <sys/time.h>
13			#include <sys/types.h>
14			#include <sys/wait.h>
15			#include <dirent.h>
16			#include <errno.h>
17			#include <fcntl.h>
18			#include <limits.h>
19			#include <pwd.h>
20			#include <signal.h>
21			#include <stdio.h>
22			#include <stdlib.h>
23			#include <string.h>
24			#include <unistd.h>
25
26			#include "def.h"
27			#include "kbd.h"
28			#include "pathnames.h"
29
30			static char bkuplocation(const char );
31			static int bkupleavetmp(const char *);
32
33			static char *bkupdir;
34			static int leavetmp = 0; /* 1 = leave any '~' files in tmp dir */
35
36			/*
37			* Open a file for reading.
38			*/
39			int
40			ffropen(FILE ** ffp, const char fn, struct buffer bp)
41			{
42			if ((*ffp = fopen(fn, "r")) == NULL) {
43			if (errno == ENOENT)
44			return (FIOFNF);
45			return (FIOERR);
46			}
47
48			/* If 'fn' is a directory open it with dired. */
49			if (fisdir(fn) == TRUE)
50			return (FIODIR);
51
52			ffstat(*ffp, bp);
53
54			return (FIOSUC);
55			}
56
57			/*
58			* Update stat/dirty info
59			*/
60			void
61			ffstat(FILE ffp, struct buffer bp)
62			{
63			struct stat sb;
64
65			if (bp && fstat(fileno(ffp), &sb) == 0) {
66			/* set highorder bit to make sure this isn't all zero */
67			bp->b_fi.fi_mode = sb.st_mode \| 0x8000;
68			bp->b_fi.fi_uid = sb.st_uid;
69			bp->b_fi.fi_gid = sb.st_gid;
70			bp->b_fi.fi_mtime = sb.st_mtimespec;
71			/* Clear the ignore flag */
72			bp->b_flag &= ~(BFIGNDIRTY \| BFDIRTY);
73			}
74			}
75
76			/*
77			* Update the status/dirty info. If there is an error,
78			* there's not a lot we can do.
79			*/
80			int
81			fupdstat(struct buffer *bp)
82			{
83			FILE *ffp;
84
85			if ((ffp = fopen(bp->b_fname, "r")) == NULL) {
86			if (errno == ENOENT)
87			return (FIOFNF);
88			return (FIOERR);
89			}
90			ffstat(ffp, bp);
91			(void)ffclose(ffp, bp);
92			return (FIOSUC);
93			}
94
95			/*
96			* Open a file for writing.
97			*/
98			int
99			ffwopen(FILE ** ffp, const char fn, struct buffer bp)
100			{
101			int fd;
102			mode_t fmode = DEFFILEMODE;
103
104			if (bp && bp->b_fi.fi_mode)
105			fmode = bp->b_fi.fi_mode & 07777;
106
107			fd = open(fn, O_RDWR \| O_CREAT \| O_TRUNC, fmode);
108			if (fd == -1) {
109			ffp = NULL;
110			dobeep();
111			ewprintf("Cannot open file for writing : %s", strerror(errno));
112			return (FIOERR);
113			}
114
115			if ((*ffp = fdopen(fd, "w")) == NULL) {
116			dobeep();
117			ewprintf("Cannot open file for writing : %s", strerror(errno));
118			close(fd);
119			return (FIOERR);
120			}
121
122			/*
123			* If we have file information, use it. We don't bother to check for
124			* errors, because there's no a lot we can do about it. Certainly
125			* trying to change ownership will fail if we aren't root. That's
126			* probably OK. If we don't have info, no need to get it, since any
127			* future writes will do the same thing.
128			*/
129			if (bp && bp->b_fi.fi_mode) {
130			fchmod(fd, bp->b_fi.fi_mode & 07777);
131			fchown(fd, bp->b_fi.fi_uid, bp->b_fi.fi_gid);
132			}
133			return (FIOSUC);
134			}
135
136			/*
137			* Close a file.
138			*/
139			/* ARGSUSED */
140			int
141			ffclose(FILE ffp, struct buffer bp)
142			{
143			if (fclose(ffp) == 0)
144			return (FIOSUC);
145			return (FIOERR);
146			}
147
148			/*
149			* Write a buffer to the already opened file. bp points to the
150			* buffer. Return the status.
151			*/
152			int
153			ffputbuf(FILE ffp, struct buffer bp)
154			{
155			struct line lp, lpend;
156
157			lpend = bp->b_headp;
158			for (lp = lforw(lpend); lp != lpend; lp = lforw(lp)) {
159			if (fwrite(ltext(lp), 1, llength(lp), ffp) != llength(lp)) {
160			dobeep();
161			ewprintf("Write I/O error");
162			return (FIOERR);
163			}
164			if (lforw(lp) != lpend) /* no implied \n on last line */
165			putc('\n', ffp);
166			}
167			/*
168			* XXX should be variable controlled (once we have variables)
169			*/
170			if (llength(lback(lpend)) != 0) {
171			if (eyorn("No newline at end of file, add one") == TRUE) {
172			lnewline_at(lback(lpend), llength(lback(lpend)));
173			putc('\n', ffp);
174			}
175			}
176			return (FIOSUC);
177			}
178
179			/*
180			* Read a line from a file, and store the bytes
181			* in the supplied buffer. Stop on end of file or end of
182			* line. When FIOEOF is returned, there is a valid line
183			* of data without the normally implied \n.
184			* If the line length exceeds nbuf, FIOLONG is returned.
185			*/
186			int
187			ffgetline(FILE ffp, char buf, int nbuf, int *nbytes)
188			{
189			int c, i;
190
191			i = 0;
192			while ((c = getc(ffp)) != EOF && c != '\n') {
193			buf[i++] = c;
194			if (i >= nbuf)
195			return (FIOLONG);
196			}
197			if (c == EOF && ferror(ffp) != FALSE) {
198			dobeep();
199			ewprintf("File read error");
200			return (FIOERR);
201			}
202			*nbytes = i;
203			return (c == EOF ? FIOEOF : FIOSUC);
204			}
205
206			/*
207			* Make a backup copy of "fname". On Unix the backup has the same
208			* name as the original file, with a "~" on the end; this seems to
209			* be newest of the new-speak. The error handling is all in "file.c".
210			* We do a copy instead of a rename since otherwise another process
211			* with an open fd will get the backup, not the new file. This is
212			* a problem when using mg with things like crontab and vipw.
213			*/
214			int
215			fbackupfile(const char *fn)
216			{
217			struct stat sb;
218			struct timespec new_times[2];
219			int from, to, serrno;
220			ssize_t nread;
221			char buf[BUFSIZ];
222			char nname, tname, *bkpth;
223
224			if (stat(fn, &sb) == -1) {
225			dobeep();
226			ewprintf("Can't stat %s : %s", fn, strerror(errno));
227			return (FALSE);
228			}
229
230			if ((bkpth = bkuplocation(fn)) == NULL)
231			return (FALSE);
232
233			if (asprintf(&nname, "%s~", bkpth) == -1) {
234			dobeep();
235			ewprintf("Can't allocate backup file name : %s", strerror(errno));
236			free(bkpth);
237			return (ABORT);
238			}
239			if (asprintf(&tname, "%s.XXXXXXXXXX", bkpth) == -1) {
240			dobeep();
241			ewprintf("Can't allocate temp file name : %s", strerror(errno));
242			free(bkpth);
243			free(nname);
244			return (ABORT);
245			}
246			free(bkpth);
247
248			if ((from = open(fn, O_RDONLY)) == -1) {
249			free(nname);
250			free(tname);
251			return (FALSE);
252			}
253			to = mkstemp(tname);
254			if (to == -1) {
255			serrno = errno;
256			close(from);
257			free(nname);
258			free(tname);
259			errno = serrno;
260			return (FALSE);
261			}
262			while ((nread = read(from, buf, sizeof(buf))) > 0) {
263			if (write(to, buf, (size_t)nread) != nread) {
264			nread = -1;
265			break;
266			}
267			}
268			serrno = errno;
269			(void) fchmod(to, (sb.st_mode & 0777));
270
271			/* copy the mtime to the backupfile */
272			new_times[0] = sb.st_atim;
273			new_times[1] = sb.st_mtim;
274			futimens(to, new_times);
275
276			close(from);
277			close(to);
278			if (nread == -1) {
279			if (unlink(tname) == -1)
280			ewprintf("Can't unlink temp : %s", strerror(errno));
281			} else {
282			if (rename(tname, nname) == -1) {
283			ewprintf("Can't rename temp : %s", strerror(errno));
284			(void) unlink(tname);
285			nread = -1;
286			}
287			}
288			free(nname);
289			free(tname);
290			errno = serrno;
291
292			return (nread == -1 ? FALSE : TRUE);
293			}
294
295			/*
296			* Convert "fn" to a canonicalized absolute filename, replacing
297			* a leading ~/ with the user's home dir, following symlinks, and
298			* remove all occurrences of /./ and /../
299			*/
300			char *
301			adjustname(const char *fn, int slashslash)
302			{
303			static char fnb[PATH_MAX];
304			const char cp, ep = NULL;
305			char *path;
306
307			if (slashslash == TRUE) {
308			cp = fn + strlen(fn) - 1;
309			for (; cp >= fn; cp--) {
310			if (ep && (*cp == '/')) {
311			fn = ep;
312			break;
313			}
314			if (cp == '/' \|\| cp == '~')
315			ep = cp;
316			else
317			ep = NULL;
318			}
319			}
320			if ((path = expandtilde(fn)) == NULL)
321			return (NULL);
322
323			if (realpath(path, fnb) == NULL)
324			(void)strlcpy(fnb, path, sizeof(fnb));
325
326			free(path);
327			return (fnb);
328			}
329
330			/*
331			* Find a startup file for the user and return its name. As a service
332			* to other pieces of code that may want to find a startup file (like
333			* the terminal driver in particular), accepts a suffix to be appended
334			* to the startup file name.
335			*/
336			char *
337			startupfile(char *suffix)
338			{
339			static char file[NFILEN];
340			char *home;
341			int ret;
342
343			if ((home = getenv("HOME")) == NULL \|\| *home == '\0')
344			goto nohome;
345
346			if (suffix == NULL) {
347			ret = snprintf(file, sizeof(file), _PATH_MG_STARTUP, home);
348			if (ret < 0 \|\| ret >= sizeof(file))
349			return (NULL);
350			} else {
351			ret = snprintf(file, sizeof(file), _PATH_MG_TERM, home, suffix);
352			if (ret < 0 \|\| ret >= sizeof(file))
353			return (NULL);
354			}
355
356			if (access(file, R_OK) == 0)
357			return (file);
358			nohome:
359			#ifdef STARTUPFILE
360			if (suffix == NULL) {
361			ret = snprintf(file, sizeof(file), "%s", STARTUPFILE);
362			if (ret < 0 \|\| ret >= sizeof(file))
363			return (NULL);
364			} else {
365			ret = snprintf(file, sizeof(file), "%s%s", STARTUPFILE,
366			suffix);
367			if (ret < 0 \|\| ret >= sizeof(file))
368			return (NULL);
369			}
370
371			if (access(file, R_OK) == 0)
372			return (file);
373			#endif /* STARTUPFILE */
374			return (NULL);
375			}
376
377			int
378			copy(char frname, char toname)
379			{
380			int ifd, ofd;
381			char buf[BUFSIZ];
382			mode_t fmode = DEFFILEMODE; /* XXX?? */
383			struct stat orig;
384			ssize_t sr;
385
386			if ((ifd = open(frname, O_RDONLY)) == -1)
387			return (FALSE);
388			if (fstat(ifd, &orig) == -1) {
389			dobeep();
390			ewprintf("fstat: %s", strerror(errno));
391			close(ifd);
392			return (FALSE);
393			}
394
395			if ((ofd = open(toname, O_WRONLY\|O_CREAT\|O_TRUNC, fmode)) == -1) {
396			close(ifd);
397			return (FALSE);
398			}
399			while ((sr = read(ifd, buf, sizeof(buf))) > 0) {
400			if (write(ofd, buf, (size_t)sr) != sr) {
401			ewprintf("write error : %s", strerror(errno));
402			break;
403			}
404			}
405			if (fchmod(ofd, orig.st_mode) == -1)
406			ewprintf("Cannot set original mode : %s", strerror(errno));
407
408			if (sr == -1) {
409			ewprintf("Read error : %s", strerror(errno));
410			close(ifd);
411			close(ofd);
412			return (FALSE);
413			}
414			/*
415			* It is "normal" for this to fail since we can't guarantee that
416			* we will be running as root.
417			*/
418			if (fchown(ofd, orig.st_uid, orig.st_gid) && errno != EPERM)
419			ewprintf("Cannot set owner : %s", strerror(errno));
420
421			(void) close(ifd);
422			(void) close(ofd);
423
424			return (TRUE);
425			}
426
427			/*
428			* return list of file names that match the name in buf.
429			*/
430			struct list *
431			make_file_list(char *buf)
432			{
433			char dir, file, *cp;
434			size_t len, preflen;
435			int ret;
436			DIR *dirp;
437			struct dirent *dent;
438			struct list last, current;
439			char fl_name[NFILEN + 2];
440			char prefixx[NFILEN + 1];
441
442			/*
443			* We need three different strings:
444
445			* dir - the name of the directory containing what the user typed.
446			* Must be a real unix file name, e.g. no ~user, etc..
447			* Must not end in /.
448			* prefix - the portion of what the user typed that is before the
449			* names we are going to find in the directory. Must have a
450			* trailing / if the user typed it.
451			* names from the directory - We open dir, and return prefix
452			* concatenated with names.
453			*/
454
455			/* first we get a directory name we can look up */
456			/*
457			* Names ending in . are potentially odd, because adjustname will
458			* treat foo/bar/.. as a foo/, whereas we are
459			* interested in names starting with ..
460			*/
461			len = strlen(buf);
462			if (len && buf[len - 1] == '.') {
463			buf[len - 1] = 'x';
464			dir = adjustname(buf, TRUE);
465			buf[len - 1] = '.';
466			} else
467			dir = adjustname(buf, TRUE);
468			if (dir == NULL)
469			return (NULL);
470			/*
471			* If the user typed a trailing / or the empty string
472			* he wants us to use his file spec as a directory name.
473			*/
474			if (len && buf[len - 1] != '/') {
475			file = strrchr(dir, '/');
476			if (file) {
477			*file = '\0';
478			if (*dir == '\0')
479			dir = "/";
480			} else
481			return (NULL);
482			}
483			/* Now we get the prefix of the name the user typed. */
484			if (strlcpy(prefixx, buf, sizeof(prefixx)) >= sizeof(prefixx))
485			return (NULL);
486			cp = strrchr(prefixx, '/');
487			if (cp == NULL)
488			prefixx[0] = '\0';
489			else
490			cp[1] = '\0';
491
492			preflen = strlen(prefixx);
493			/* cp is the tail of buf that really needs to be compared. */
494			cp = buf + preflen;
495			len = strlen(cp);
496
497			/*
498			* Now make sure that file names will fit in the buffers allocated.
499			* SV files are fairly short. For BSD, something more general would
500			* be required.
501			*/
502			if (preflen > NFILEN - MAXNAMLEN)
503			return (NULL);
504
505			/* loop over the specified directory, making up the list of files */
506
507			/*
508			* Note that it is worth our time to filter out names that don't
509			* match, even though our caller is going to do so again, and to
510			* avoid doing the stat if completion is being done, because stat'ing
511			* every file in the directory is relatively expensive.
512			*/
513
514			dirp = opendir(dir);
515			if (dirp == NULL)
516			return (NULL);
517			last = NULL;
518
519			while ((dent = readdir(dirp)) != NULL) {
520			int isdir;
521			if (strncmp(cp, dent->d_name, len) != 0)
522			continue;
523			isdir = 0;
524			if (dent->d_type == DT_DIR) {
525			isdir = 1;
526			} else if (dent->d_type == DT_LNK \|\|
527			dent->d_type == DT_UNKNOWN) {
528			struct stat statbuf;
529
530			if (fstatat(dirfd(dirp), dent->d_name, &statbuf, 0) < 0)
531			continue;
532			if (S_ISDIR(statbuf.st_mode))
533			isdir = 1;
534			}
535
536			if ((current = malloc(sizeof(struct list))) == NULL) {
537			free_file_list(last);
538			closedir(dirp);
539			return (NULL);
540			}
541			ret = snprintf(fl_name, sizeof(fl_name),
542			"%s%s%s", prefixx, dent->d_name, isdir ? "/" : "");
543			if (ret < 0 \|\| ret >= sizeof(fl_name)) {
544			free(current);
545			continue;
546			}
547			current->l_next = last;
548			current->l_name = strdup(fl_name);
549			last = current;
550			}
551			closedir(dirp);
552
553			return (last);
554			}
555
556			/*
557			* Test if a supplied filename refers to a directory
558			* Returns ABORT on error, TRUE if directory. FALSE otherwise
559			*/
560			int
561			fisdir(const char *fname)
562			{
563			struct stat statbuf;
564
565			if (stat(fname, &statbuf) != 0)
566			return (ABORT);
567
568			if (S_ISDIR(statbuf.st_mode))
569			return (TRUE);
570
571			return (FALSE);
572			}
573
574			/*
575			* Check the mtime of the supplied filename.
576			* Return TRUE if last mtime matches, FALSE if not,
577			* If the stat fails, return TRUE and try the save anyway
578			*/
579			int
580			fchecktime(struct buffer *bp)
581			{
582			struct stat sb;
583
584			if (stat(bp->b_fname, &sb) == -1)
585			return (TRUE);
586
587			if (bp->b_fi.fi_mtime.tv_sec != sb.st_mtimespec.tv_sec \|\|
588			bp->b_fi.fi_mtime.tv_nsec != sb.st_mtimespec.tv_nsec)
589			return (FALSE);
590
591			return (TRUE);
592
593			}
594
595			/*
596			* Location of backup file. This function creates the correct path.
597			*/
598			static char *
599			bkuplocation(const char *fn)
600			{
601			struct stat sb;
602			char *ret;
603
604			if (bkupdir != NULL && (stat(bkupdir, &sb) == 0) &&
605			S_ISDIR(sb.st_mode) && !bkupleavetmp(fn)) {
606			char fname[NFILEN];
607			const char *c;
608			int i = 0, len;
609
610			c = fn;
611			len = strlen(bkupdir);
612
613			while (*c != '\0') {
614			/* Make sure we don't go over combined:
615			* strlen(bkupdir + '/' + fname + '\0')
616			*/
617			if (i >= NFILEN - len - 1)
618			return (NULL);
619			if (*c == '/') {
620			fname[i] = '!';
621			} else if (*c == '!') {
622			if (i >= NFILEN - len - 2)
623			return (NULL);
624			fname[i++] = '!';
625			fname[i] = '!';
626			} else
627			fname[i] = *c;
628			i++;
629			c++;
630			}
631			fname[i] = '\0';
632			if (asprintf(&ret, "%s/%s", bkupdir, fname) == -1)
633			return (NULL);
634
635			} else if ((ret = strndup(fn, NFILEN)) == NULL)
636			return (NULL);
637
638			return (ret);
639			}
640
641			int
642			backuptohomedir(int f, int n)
643			{
644			const char *c = _PATH_MG_DIR;
645			char *p;
646
647			if (bkupdir == NULL) {
648			p = adjustname(c, TRUE);
649			bkupdir = strndup(p, NFILEN);
650			if (bkupdir == NULL)
651			return(FALSE);
652
653			if (mkdir(bkupdir, 0700) == -1 && errno != EEXIST) {
654			free(bkupdir);
655			bkupdir = NULL;
656			}
657			} else {
658			free(bkupdir);
659			bkupdir = NULL;
660			}
661
662			return (TRUE);
663			}
664
665			/*
666			* For applications that use mg as the editor and have a desire to keep
667			* '~' files in /tmp, toggle the location: /tmp \| ~/.mg.d
668			*/
669			int
670			toggleleavetmp(int f, int n)
671			{
672			leavetmp = !leavetmp;
673
674			return (TRUE);
675			}
676
677			/*
678			* Returns TRUE if fn is located in the temp directory and we want to save
679			* those backups there.
680			*/
681			int
682			bkupleavetmp(const char *fn)
683			{
684			if (!leavetmp)
685			return(FALSE);
686
687			if (strncmp(fn, "/tmp", 4) == 0)
688			return (TRUE);
689
690			return (FALSE);
691			}
692
693			/*
694			* Expand file names beginning with '~' if appropriate:
695			* 1, if ./~fn exists, continue without expanding tilde.
696			* 2, else, if username 'fn' exists, expand tilde with home directory path.
697			* 3, otherwise, continue and create new buffer called ~fn.
698			*/
699			char *
700			expandtilde(const char *fn)
701			{
702			struct passwd *pw;
703			struct stat statbuf;
704			const char *cp;
705			char user[LOGIN_NAME_MAX], path[NFILEN];
706			char un, ret;
707			size_t ulen, plen;
708
709			path[0] = '\0';
710
711			if (fn[0] != '~' \|\| stat(fn, &statbuf) == 0) {
712			if ((ret = strndup(fn, NFILEN)) == NULL)
713			return (NULL);
714			return(ret);
715			}
716			cp = strchr(fn, '/');
717			if (cp == NULL)
718			cp = fn + strlen(fn); /* point to the NUL byte */
719			ulen = cp - &fn[1];
720			if (ulen >= sizeof(user)) {
721			if ((ret = strndup(fn, NFILEN)) == NULL)
722			return (NULL);
723			return(ret);
724			}
725			if (ulen == 0) { /* ~/ or ~ */
726			if ((un = getlogin()) != NULL)
727			(void)strlcpy(user, un, sizeof(user));
728			else
729			user[0] = '\0';
730			} else { /* ~user/ or ~user */
731			memcpy(user, &fn[1], ulen);
732			user[ulen] = '\0';
733			}
734			pw = getpwnam(user);
735			if (pw != NULL) {
736			plen = strlcpy(path, pw->pw_dir, sizeof(path));
737			if (plen == 0 \|\| path[plen - 1] != '/') {
738			if (strlcat(path, "/", sizeof(path)) >= sizeof(path)) {
739			dobeep();
740			ewprintf("Path too long");
741			return (NULL);
742			}
743			}
744			fn = cp;
745			if (*fn == '/')
746			fn++;
747			}
748			if (strlcat(path, fn, sizeof(path)) >= sizeof(path)) {
749			dobeep();
750			ewprintf("Path too long");
751			return (NULL);
752			}
753			if ((ret = strndup(path, NFILEN)) == NULL)
754			return (NULL);
755
756			return (ret);
757			}