/* $OpenBSD: file.c,v 1.100 2016/01/02 10:39:19 lum Exp $ */
/* This file is in the public domain. */
/*
* File commands.
*/
#include <sys/queue.h>
#include <sys/stat.h>
#include <errno.h>
#include <libgen.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "def.h"
size_t xdirname(char *, const char *, size_t);
/*
* Insert a file into the current buffer. Real easy - just call the
* insertfile routine with the file name.
*/
/* ARGSUSED */
int
fileinsert(int f, int n)
{
char fname[NFILEN], *bufp, *adjf;
if (getbufcwd(fname, sizeof(fname)) != TRUE)
fname[0] = '\0';
bufp = eread("Insert file: ", fname, NFILEN,
EFNEW | EFCR | EFFILE | EFDEF);
if (bufp == NULL)
return (ABORT);
else if (bufp[0] == '\0')
return (FALSE);
adjf = adjustname(bufp, TRUE);
if (adjf == NULL)
return (FALSE);
return (insertfile(adjf, NULL, FALSE));
}
/*
* Select a file for editing. If the file is a directory, invoke dired.
* Otherwise, look around to see if you can find the file in another buffer;
* if you can find it, just switch to the buffer. If you cannot find the
* file, create a new buffer, read in the text, and switch to the new buffer.
*/
/* ARGSUSED */
int
filevisit(int f, int n)
{
struct buffer *bp;
char fname[NFILEN], *bufp, *adjf;
int status;
if (getbufcwd(fname, sizeof(fname)) != TRUE)
fname[0] = '\0';
bufp = eread("Find file: ", fname, NFILEN,
EFNEW | EFCR | EFFILE | EFDEF);
if (bufp == NULL)
return (ABORT);
else if (bufp[0] == '\0')
return (FALSE);
adjf = adjustname(fname, TRUE);
if (adjf == NULL)
return (FALSE);
if (fisdir(adjf) == TRUE)
return (do_dired(adjf));
if ((bp = findbuffer(adjf)) == NULL)
return (FALSE);
curbp = bp;
if (showbuffer(bp, curwp, WFFULL) != TRUE)
return (FALSE);
if (bp->b_fname[0] == '\0') {
if ((status = readin(adjf)) != TRUE)
killbuffer(bp);
return (status);
}
return (TRUE);
}
/*
* Replace the current file with an alternate one. Semantics for finding
* the replacement file are the same as 'filevisit', except the current
* buffer is killed before the switch. If the kill fails, or is aborted,
* revert to the original file.
*/
/* ARGSUSED */
int
filevisitalt(int f, int n)
{
char fname[NFILEN], *bufp;
if (getbufcwd(fname, sizeof(fname)) != TRUE)
fname[0] = '\0';
bufp = eread("Find alternate file: ", fname, NFILEN,
EFNEW | EFCR | EFFILE | EFDEF);
if (bufp == NULL)
return (ABORT);
else if (bufp[0] == '\0')
return (FALSE);
return (do_filevisitalt(fname));
}
int
do_filevisitalt(char *fn)
{
struct buffer *bp;
int status;
char *adjf;
status = killbuffer(curbp);
if (status == ABORT || status == FALSE)
return (ABORT);
adjf = adjustname(fn, TRUE);
if (adjf == NULL)
return (FALSE);
if (fisdir(adjf) == TRUE)
return (do_dired(adjf));
if ((bp = findbuffer(adjf)) == NULL)
return (FALSE);
curbp = bp;
if (showbuffer(bp, curwp, WFFULL) != TRUE)
return (FALSE);
if (bp->b_fname[0] == '\0') {
if ((status = readin(adjf)) != TRUE)
killbuffer(bp);
return (status);
}
return (TRUE);
}
int
filevisitro(int f, int n)
{
int error;
error = filevisit(f, n);
if (error != TRUE)
return (error);
curbp->b_flag |= BFREADONLY;
return (TRUE);
}
/*
* Pop to a file in the other window. Same as the last function, but uses
* popbuf instead of showbuffer.
*/
/* ARGSUSED */
int
poptofile(int f, int n)
{
struct buffer *bp;
struct mgwin *wp;
char fname[NFILEN], *adjf, *bufp;
int status;
if (getbufcwd(fname, sizeof(fname)) != TRUE)
fname[0] = '\0';
if ((bufp = eread("Find file in other window: ", fname, NFILEN,
EFNEW | EFCR | EFFILE | EFDEF)) == NULL)
return (ABORT);
else if (bufp[0] == '\0')
return (FALSE);
adjf = adjustname(fname, TRUE);
if (adjf == NULL)
return (FALSE);
if (fisdir(adjf) == TRUE)
return (do_dired(adjf));
if ((bp = findbuffer(adjf)) == NULL)
return (FALSE);
if (bp == curbp)
return (splitwind(f, n));
if ((wp = popbuf(bp, WNONE)) == NULL)
return (FALSE);
curbp = bp;
curwp = wp;
if (bp->b_fname[0] == '\0') {
if ((status = readin(adjf)) != TRUE)
killbuffer(bp);
return (status);
}
return (TRUE);
}
/*
* Read the file "fname" into the current buffer. Make all of the text
* in the buffer go away, after checking for unsaved changes. This is
* called by the "read" command, the "visit" command, and the mainline
* (for "mg file").
*/
int
readin(char *fname)
{
struct mgwin *wp;
struct stat statbuf;
int status, i, ro = FALSE;
PF *ael;
char dp[NFILEN];
/* might be old */
if (bclear(curbp) != TRUE)
return (TRUE);
/* Clear readonly. May be set by autoexec path */
curbp->b_flag &= ~BFREADONLY;
if ((status = insertfile(fname, fname, TRUE)) != TRUE) {
dobeep();
ewprintf("File is not readable: %s", fname);
return (FALSE);
}
for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
if (wp->w_bufp == curbp) {
wp->w_dotp = wp->w_linep = bfirstlp(curbp);
wp->w_doto = 0;
wp->w_markp = NULL;
wp->w_marko = 0;
}
}
/*
* Call auto-executing function if we need to.
*/
if ((ael = find_autoexec(fname)) != NULL) {
for (i = 0; ael[i] != NULL; i++)
(*ael[i])(0, 1);
free(ael);
}
/* no change */
curbp->b_flag &= ~BFCHG;
/*
* Set the buffer READONLY flag if any of following are true:
* 1. file is a directory.
* 2. file is read-only.
* 3. file doesn't exist and directory is read-only.
*/
if (fisdir(fname) == TRUE) {
ro = TRUE;
} else if ((access(fname, W_OK) == -1)) {
if (errno != ENOENT) {
ro = TRUE;
} else if (errno == ENOENT) {
(void)xdirname(dp, fname, sizeof(dp));
(void)strlcat(dp, "/", sizeof(dp));
/* Missing directory; keep buffer rw, like emacs */
if (stat(dp, &statbuf) == -1 && errno == ENOENT) {
if (eyorn("Missing directory, create") == TRUE)
(void)do_makedir(dp);
} else if (access(dp, W_OK) == -1 && errno == EACCES) {
ewprintf("File not found and directory"
" write-protected");
ro = TRUE;
}
}
}
if (ro == TRUE)
curbp->b_flag |= BFREADONLY;
if (startrow) {
gotoline(FFARG, startrow);
startrow = 0;
}
undo_add_modified();
return (status);
}
/*
* NB, getting file attributes is done here under control of a flag
* rather than in readin, which would be cleaner. I was concerned
* that some operating system might require the file to be open
* in order to get the information. Similarly for writing.
*/
/*
* Insert a file in the current buffer, after dot. If file is a directory,
* and 'replacebuf' is TRUE, invoke dired mode, else die with an error.
* If file is a regular file, set mark at the end of the text inserted;
* point at the beginning. Return a standard status. Print a summary
* (lines read, error message) out as well. This routine also does the
* read end of backup processing. The BFBAK flag, if set in a buffer,
* says that a backup should be taken. It is set when a file is read in,
* but not on a new file. You don't need to make a backup copy of nothing.
*/
static char *line = NULL;
static int linesize = 0;
int
insertfile(char *fname, char *newname, int replacebuf)
{
struct buffer *bp;
struct line *lp1, *lp2;
struct line *olp; /* line we started at */
struct mgwin *wp;
int nbytes, s, nline = 0, siz, x, x2;
int opos; /* offset we started at */
int oline; /* original line number */
FILE *ffp;
if (replacebuf == TRUE)
x = undo_enable(FFRAND, 0);
else
x = undo_enabled();
lp1 = NULL;
if (line == NULL) {
line = malloc(NLINE);
if (line == NULL)
panic("out of memory");
linesize = NLINE;
}
/* cheap */
bp = curbp;
if (newname != NULL) {
(void)strlcpy(bp->b_fname, newname, sizeof(bp->b_fname));
(void)xdirname(bp->b_cwd, newname, sizeof(bp->b_cwd));
(void)strlcat(bp->b_cwd, "/", sizeof(bp->b_cwd));
}
/* hard file open */
if ((s = ffropen(&ffp, fname, (replacebuf == TRUE) ? bp : NULL))
== FIOERR)
goto out;
if (s == FIOFNF) {
/* file not found */
if (newname != NULL)
ewprintf("(New file)");
else
ewprintf("(File not found)");
goto out;
} else if (s == FIODIR) {
/* file was a directory */
if (replacebuf == FALSE) {
dobeep();
ewprintf("Cannot insert: file is a directory, %s",
fname);
goto cleanup;
}
killbuffer(bp);
bp = dired_(fname);
undo_enable(FFRAND, x);
if (bp == NULL)
return (FALSE);
curbp = bp;
return (showbuffer(bp, curwp, WFFULL | WFMODE));
} else {
(void)xdirname(bp->b_cwd, fname, sizeof(bp->b_cwd));
(void)strlcat(bp->b_cwd, "/", sizeof(bp->b_cwd));
}
opos = curwp->w_doto;
oline = curwp->w_dotline;
/*
* Open a new line at dot and start inserting after it.
* We will delete this newline after insertion.
* Disable undo, as we create the undo record manually.
*/
x2 = undo_enable(FFRAND, 0);
(void)lnewline();
olp = lback(curwp->w_dotp);
undo_enable(FFRAND, x2);
nline = 0;
siz = 0;
while ((s = ffgetline(ffp, line, linesize, &nbytes)) != FIOERR) {
retry:
siz += nbytes + 1;
switch (s) {
case FIOSUC:
/* FALLTHRU */
case FIOEOF:
++nline;
if ((lp1 = lalloc(nbytes)) == NULL) {
/* keep message on the display */
s = FIOERR;
undo_add_insert(olp, opos,
siz - nbytes - 1 - 1);
goto endoffile;
}
bcopy(line, <ext(lp1)[0], nbytes);
lp2 = lback(curwp->w_dotp);
lp2->l_fp = lp1;
lp1->l_fp = curwp->w_dotp;
lp1->l_bp = lp2;
curwp->w_dotp->l_bp = lp1;
if (s == FIOEOF) {
undo_add_insert(olp, opos, siz - 1);
goto endoffile;
}
break;
case FIOLONG: {
/* a line too long to fit in our buffer */
char *cp;
int newsize;
newsize = linesize * 2;
if (newsize < 0 ||
(cp = malloc(newsize)) == NULL) {
dobeep();
ewprintf("Could not allocate %d bytes",
newsize);
s = FIOERR;
goto endoffile;
}
bcopy(line, cp, linesize);
free(line);
line = cp;
s = ffgetline(ffp, line + linesize, linesize,
&nbytes);
nbytes += linesize;
linesize = newsize;
if (s == FIOERR)
goto endoffile;
goto retry;
}
default:
dobeep();
ewprintf("Unknown code %d reading file", s);
s = FIOERR;
break;
}
}
endoffile:
/* ignore errors */
(void)ffclose(ffp, NULL);
/* don't zap an error */
if (s == FIOEOF) {
if (nline == 1)
ewprintf("(Read 1 line)");
else
ewprintf("(Read %d lines)", nline);
}
/* set mark at the end of the text */
curwp->w_dotp = curwp->w_markp = lback(curwp->w_dotp);
curwp->w_marko = llength(curwp->w_markp);
curwp->w_markline = oline + nline + 1;
/*
* if we are at the end of the file, ldelnewline is a no-op,
* but we still need to decrement the line and markline counts
* as we've accounted for this fencepost in our arithmetic
*/
if (lforw(curwp->w_dotp) == curwp->w_bufp->b_headp) {
curwp->w_bufp->b_lines--;
curwp->w_markline--;
} else
(void)ldelnewline();
curwp->w_dotp = olp;
curwp->w_doto = opos;
curwp->w_dotline = oline;
if (olp == curbp->b_headp)
curwp->w_dotp = lforw(olp);
if (newname != NULL)
bp->b_flag |= BFCHG | BFBAK; /* Need a backup. */
else
bp->b_flag |= BFCHG;
/*
* If the insert was at the end of buffer, set lp1 to the end of
* buffer line, and lp2 to the beginning of the newly inserted text.
* (Otherwise lp2 is set to NULL.) This is used below to set
* pointers in other windows correctly if they are also at the end of
* buffer.
*/
lp1 = bp->b_headp;
if (curwp->w_markp == lp1) {
lp2 = curwp->w_dotp;
} else {
/* delete extraneous newline */
(void)ldelnewline();
out: lp2 = NULL;
}
for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
if (wp->w_bufp == curbp) {
wp->w_rflag |= WFMODE | WFEDIT;
if (wp != curwp && lp2 != NULL) {
if (wp->w_dotp == lp1)
wp->w_dotp = lp2;
if (wp->w_markp == lp1)
wp->w_markp = lp2;
if (wp->w_linep == lp1)
wp->w_linep = lp2;
}
}
}
bp->b_lines += nline;
cleanup:
undo_enable(FFRAND, x);
/* return FALSE if error */
return (s != FIOERR);
}
/*
* Ask for a file name and write the contents of the current buffer to that
* file. Update the remembered file name and clear the buffer changed flag.
* This handling of file names is different from the earlier versions and
* is more compatible with Gosling EMACS than with ITS EMACS.
*/
/* ARGSUSED */
int
filewrite(int f, int n)
{
struct stat statbuf;
int s;
char fname[NFILEN], bn[NBUFN], tmp[NFILEN + 25];
char *adjfname, *bufp;
FILE *ffp;
if (getbufcwd(fname, sizeof(fname)) != TRUE)
fname[0] = '\0';
if ((bufp = eread("Write file: ", fname, NFILEN,
EFDEF | EFNEW | EFCR | EFFILE)) == NULL)
return (ABORT);
else if (bufp[0] == '\0')
return (FALSE);
adjfname = adjustname(fname, TRUE);
if (adjfname == NULL)
return (FALSE);
/* Check if file exists; write checks done later */
if (stat(adjfname, &statbuf) == 0) {
if (S_ISDIR(statbuf.st_mode)) {
dobeep();
ewprintf("%s is a directory", adjfname);
return (FALSE);
}
snprintf(tmp, sizeof(tmp), "File `%s' exists; overwrite",
adjfname);
if ((s = eyorn(tmp)) != TRUE)
return (s);
}
/* old attributes are no longer current */
bzero(&curbp->b_fi, sizeof(curbp->b_fi));
if ((s = writeout(&ffp, curbp, adjfname)) == TRUE) {
(void)strlcpy(curbp->b_fname, adjfname, sizeof(curbp->b_fname));
if (getbufcwd(curbp->b_cwd, sizeof(curbp->b_cwd)) != TRUE)
(void)strlcpy(curbp->b_cwd, "/", sizeof(curbp->b_cwd));
if (augbname(bn, curbp->b_fname, sizeof(bn))
== FALSE)
return (FALSE);
free(curbp->b_bname);
if ((curbp->b_bname = strdup(bn)) == NULL)
return (FALSE);
(void)fupdstat(curbp);
curbp->b_flag &= ~(BFBAK | BFCHG);
upmodes(curbp);
undo_add_boundary(FFRAND, 1);
undo_add_modified();
}
return (s);
}
/*
* Save the contents of the current buffer back into its associated file.
*/
static int makebackup = TRUE;
/* ARGSUSED */
int
filesave(int f, int n)
{
if (curbp->b_fname[0] == '\0')
return (filewrite(f, n));
else
return (buffsave(curbp));
}
/*
* Save the contents of the buffer argument into its associated file. Do
* nothing if there have been no changes (is this a bug, or a feature?).
* Error if there is no remembered file name. If this is the first write
* since the read or visit, then a backup copy of the file is made.
* Allow user to select whether or not to make backup files by looking at
* the value of makebackup.
*/
int
buffsave(struct buffer *bp)
{
int s;
FILE *ffp;
/* return, no changes */
if ((bp->b_flag & BFCHG) == 0) {
ewprintf("(No changes need to be saved)");
return (TRUE);
}
/* must have a name */
if (bp->b_fname[0] == '\0') {
dobeep();
ewprintf("No file name");
return (FALSE);
}
/* Ensure file has not been modified elsewhere */
/* We don't use the ignore flag here */
if (fchecktime(bp) != TRUE) {
if ((s = eyesno("File has changed on disk since last save. "
"Save anyway")) != TRUE)
return (s);
}
if (makebackup && (bp->b_flag & BFBAK)) {
s = fbackupfile(bp->b_fname);
/* hard error */
if (s == ABORT)
return (FALSE);
/* softer error */
if (s == FALSE &&
(s = eyesno("Backup error, save anyway")) != TRUE)
return (s);
}
if ((s = writeout(&ffp, bp, bp->b_fname)) == TRUE) {
(void)fupdstat(bp);
bp->b_flag &= ~(BFCHG | BFBAK);
upmodes(bp);
undo_add_boundary(FFRAND, 1);
undo_add_modified();
}
return (s);
}
/*
* Since we don't have variables (we probably should) this is a command
* processor for changing the value of the make backup flag. If no argument
* is given, sets makebackup to true, so backups are made. If an argument is
* given, no backup files are made when saving a new version of a file.
*/
/* ARGSUSED */
int
makebkfile(int f, int n)
{
if (f & FFARG)
makebackup = n > 0;
else
makebackup = !makebackup;
ewprintf("Backup files %sabled", makebackup ? "en" : "dis");
return (TRUE);
}
/*
* NB: bp is passed to both ffwopen and ffclose because some
* attribute information may need to be updated at open time
* and others after the close. This is OS-dependent. Note
* that the ff routines are assumed to be able to tell whether
* the attribute information has been set up in this buffer
* or not.
*/
/*
* This function performs the details of file writing; writing the file
* in buffer bp to file fn. Uses the file management routines in the
* "fileio.c" package. Most of the grief is checking of some sort.
* You may want to call fupdstat() after using this function.
*/
int
writeout(FILE ** ffp, struct buffer *bp, char *fn)
{
struct stat statbuf;
int s;
char dp[NFILEN];
if (stat(fn, &statbuf) == -1 && errno == ENOENT) {
errno = 0;
(void)xdirname(dp, fn, sizeof(dp));
(void)strlcat(dp, "/", sizeof(dp));
if (access(dp, W_OK) && errno == EACCES) {
dobeep();
ewprintf("Directory %s write-protected", dp);
return (FIOERR);
} else if (errno == ENOENT) {
dobeep();
ewprintf("%s: no such directory", dp);
return (FIOERR);
}
}
/* open writes message */
if ((s = ffwopen(ffp, fn, bp)) != FIOSUC)
return (FALSE);
s = ffputbuf(*ffp, bp);
if (s == FIOSUC) {
/* no write error */
s = ffclose(*ffp, bp);
if (s == FIOSUC)
ewprintf("Wrote %s", fn);
} else {
/* print a message indicating write error */
(void)ffclose(*ffp, bp);
dobeep();
ewprintf("Unable to write %s", fn);
}
return (s == FIOSUC);
}
/*
* Tag all windows for bp (all windows if bp == NULL) as needing their
* mode line updated.
*/
void
upmodes(struct buffer *bp)
{
struct mgwin *wp;
for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
if (bp == NULL || curwp->w_bufp == bp)
wp->w_rflag |= WFMODE;
}
/*
* dirname using strlcpy semantic.
* Like dirname() except an empty string is returned in
* place of "/". This means we can always add a trailing
* slash and be correct.
* Address portability issues by copying argument
* before using. Some implementations modify the input string.
*/
size_t
xdirname(char *dp, const char *path, size_t dplen)
{
char ts[NFILEN];
size_t len;
(void)strlcpy(ts, path, NFILEN);
len = strlcpy(dp, dirname(ts), dplen);
if (dplen > 0 && dp[0] == '/' && dp[1] == '\0') {
dp[0] = '\0';
len = 0;
}
return (len);
}
/*
* basename using strlcpy/strlcat semantic.
* Address portability issue by copying argument
* before using: some implementations modify the input string.
*/
size_t
xbasename(char *bp, const char *path, size_t bplen)
{
char ts[NFILEN];
(void)strlcpy(ts, path, NFILEN);
return (strlcpy(bp, basename(ts), bplen));
}
/*
* The adjusted file name refers to a directory, so open dired mode.
*/
int
do_dired(char *adjf)
{
struct buffer *bp;
if ((bp = dired_(adjf)) == FALSE)
return (FALSE);
curbp = bp;
return (showbuffer(bp, curwp, WFFULL | WFMODE));
}