File: [local] / src / usr.bin / mg / file.c (download)
Revision 1.5, Mon Jan 29 01:58:07 2001 UTC (23 years, 3 months ago) by niklas
Branch: MAIN
CVS Tags: OPENBSD_2_9_BASE, OPENBSD_2_9 Changes since 1.4: +2 -0 lines
$OpenBSD$
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/* $OpenBSD: file.c,v 1.5 2001/01/29 01:58:07 niklas Exp $ */
/*
* File commands.
*/
#include "def.h"
static char *itos __P((char *, unsigned int));
/*
* Insert a file into the current buffer. Real easy - just call the
* insertfile routine with the file name.
*/
/* ARGSUSED */
int
fileinsert(f, n)
int f, n;
{
int s;
char fname[NFILEN];
s = eread("Insert file: ", fname, NFILEN, EFNEW | EFCR | EFFILE);
if (s != TRUE)
return (s);
return insertfile(adjustname(fname), (char *)NULL, FALSE);
/* don't set buffer name */
}
/*
* Select a file for editing. 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(f, n)
int f, n;
{
BUFFER *bp;
int s;
char fname[NFILEN];
char *adjf;
s = eread("Find file: ", fname, NFILEN, EFNEW | EFCR | EFFILE);
if (s != TRUE)
return s;
adjf = adjustname(fname);
if ((bp = findbuffer(adjf)) == NULL)
return FALSE;
curbp = bp;
if (showbuffer(bp, curwp, WFHARD) != TRUE)
return FALSE;
if (bp->b_fname[0] == 0)
return readin(adjf);
return TRUE;
}
/*
* Pop to a file in the other window. Same as the last function, but uses
* popbuf instead of showbuffer.
*/
/* ARGSUSED */
int
poptofile(f, n)
int f, n;
{
BUFFER *bp;
MGWIN *wp;
int s;
char fname[NFILEN];
char *adjf;
if ((s = eread("Find file in other window: ", fname, NFILEN,
EFNEW | EFCR | EFFILE)) != TRUE)
return s;
adjf = adjustname(fname);
if ((bp = findbuffer(adjf)) == NULL)
return FALSE;
if ((wp = popbuf(bp)) == NULL)
return FALSE;
curbp = bp;
curwp = wp;
if (bp->b_fname[0] == 0)
return readin(adjf);
return TRUE;
}
/*
* given a file name, either find the buffer it uses, or create a new
* empty buffer to put it in.
*/
BUFFER *
findbuffer(fname)
char *fname;
{
BUFFER *bp;
char bname[NBUFN], *cp;
unsigned int count = 1;
for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
if (fncmp(bp->b_fname, fname) == 0)
return bp;
}
/* new buffer name */
makename(bname, fname);
cp = bname + strlen(bname);
while (bfind(bname, FALSE) != NULL) {
/* add "<count>" to the name */
*cp = '<';
(VOID)strcpy(itos(cp, ++count) + 1, ">");
}
return bfind(bname, TRUE);
}
/*
* Put the decimal representation of num into a buffer. Hacked to be
* faster, smaller, and less general.
*/
static char *
itos(bufp, num)
char *bufp;
unsigned int num;
{
if (num >= 10) {
bufp = itos(bufp, num / 10);
num %= 10;
}
*++bufp = '0' + num;
return bufp;
}
/*
* 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 "uemacs file").
*/
int
readin(fname)
char *fname;
{
MGWIN *wp;
int status;
/* might be old */
if (bclear(curbp) != TRUE)
return TRUE;
status = insertfile(fname, fname, TRUE);
/* no change */
curbp->b_flag &= ~BFCHG;
for (wp = wheadp; wp != NULL; wp = wp->w_wndp) {
if (wp->w_bufp == curbp) {
wp->w_dotp = wp->w_linep = lforw(curbp->b_linep);
wp->w_doto = 0;
wp->w_markp = NULL;
wp->w_marko = 0;
}
}
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. 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. If the BACKUP
* conditional is set, then 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(fname, newname, needinfo)
char *fname, *newname;
int needinfo;
{
BUFFER *bp;
LINE *lp1, *lp2;
LINE *olp; /* line we started at */
MGWIN *wp;
int nbytes, s, nline;
int opos; /* and offset into it */
lp1 = NULL;
if (line == NULL) {
line = malloc(NLINE);
linesize = NLINE;
}
/* cheap */
bp = curbp;
if (newname != (char *)NULL)
(VOID)strcpy(bp->b_fname, newname);
/* hard file open */
if ((s = ffropen(fname, needinfo ? bp : (BUFFER *) NULL)) == FIOERR)
goto out;
if (s == FIOFNF) {
/* file not found */
if (newname != NULL)
ewprintf("(New file)");
else
ewprintf("(File not found)");
goto out;
}
opos = curwp->w_doto;
/* open a new line, at point, and start inserting after it */
(VOID)lnewline();
olp = lback(curwp->w_dotp);
if (olp == curbp->b_linep) {
/* if at end of buffer, create a line to insert before */
(VOID)lnewline();
curwp->w_dotp = lback(curwp->w_dotp);
}
/* don't count fake lines at the end */
nline = 0;
while ((s = ffgetline(line, linesize, &nbytes)) != FIOERR) {
doneread:
switch (s) {
case FIOSUC:
++nline;
/* and continue */
case FIOEOF:
/* the last line of the file */
if ((lp1 = lalloc(nbytes)) == NULL) {
/* keep message on the display */
s = FIOERR;
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)
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((unsigned)newsize)) == NULL) {
ewprintf("Could not allocate %d bytes",
newsize);
s = FIOERR;
goto endoffile;
}
bcopy(line, cp, linesize);
free(line);
line = cp;
s = ffgetline(line + linesize, linesize,
&nbytes);
nbytes += linesize;
linesize = newsize;
if (s == FIOERR)
goto endoffile;
goto doneread;
}
default:
ewprintf("Unknown code %d reading file", s);
s = FIOERR;
break;
}
}
endoffile:
/* ignore errors */
(VOID)ffclose((BUFFER *)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);
(VOID)ldelnewline();
curwp->w_dotp = olp;
curwp->w_doto = opos;
if (olp == curbp->b_linep)
curwp->w_dotp = lforw(olp);
#ifndef NO_BACKUP
if (newname != NULL)
bp->b_flag |= BFCHG | BFBAK; /* Need a backup. */
else
bp->b_flag |= BFCHG;
#else /* !NO_BACKUP */
bp->b_flag |= BFCHG;
#endif /* !NO_BACKUP */
/*
* 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_linep;
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_flag |= 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;
}
}
}
/* return false if error */
return s != FIOERR;
}
/*
* Fabriacte a buffer name from a given filename. This routing knows
* about the syntax of file names on the target system.
* BDC1 left scan delimiter.
* BDC2 optional second left scan delimiter.
* BDC3 optional right scan delimiter.
*/
VOID
makename(bname, fname)
char *bname, *fname;
{
char *cp1, *cp2;
cp1 = &fname[0];
while (*cp1 != 0)
++cp1;
/* insure at least 1 character */
--cp1;
#ifdef BDC2
while (cp1 != &fname[0] && cp1[-1] != BDC1 && cp1[-1] != BDC2)
--cp1;
#else /* BDC2 */
while (cp1 != &fname[0] && cp1[-1] != BDC1)
--cp1;
#endif /* BDC2 */
cp2 = &bname[0];
#ifdef BDC3
while (cp2 != &bname[NBUFN - 1] && *cp1 != 0 && *cp1 != BDC3)
*cp2++ = *cp1++;
#else /* BDC3 */
while (cp2 != &bname[NBUFN - 1] && *cp1 != 0)
*cp2++ = *cp1++;
#endif /* BDC3 */
*cp2 = 0;
}
/*
* 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 compatable with Gosling EMACS than with ITS EMACS.
*/
/* ARGSUSED */
int
filewrite(f, n)
int f, n;
{
int s;
char fname[NFILEN];
char *adjfname;
if ((s = eread("Write file: ", fname, NFILEN,
EFNEW | EFCR | EFFILE)) != TRUE)
return (s);
adjfname = adjustname(fname);
/* old attributes are no longer current */
bzero(&curbp->b_fi, sizeof(curbp->b_fi));
if ((s = writeout(curbp, adjfname)) == TRUE) {
(VOID)strcpy(curbp->b_fname, adjfname);
#ifndef NO_BACKUP
curbp->b_flag &= ~(BFBAK | BFCHG);
#else /* !NO_BACKUP */
curbp->b_flag &= ~BFCHG;
#endif /* !NO_BACKUP */
upmodes(curbp);
}
return s;
}
/*
* Save the contents of the current buffer back into its associated file.
*/
#ifndef NO_BACKUP
#ifndef MAKEBACKUP
#define MAKEBACKUP TRUE
#endif /* !MAKEBACKUP */
static int makebackup = MAKEBACKUP;
#endif /* !NO_BACKUP */
/* ARGSUSED */
int
filesave(f, n)
int f, n;
{
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(bp)
BUFFER *bp;
{
int s;
/* 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') {
ewprintf("No file name");
return (FALSE);
}
#ifndef NO_BACKUP
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;
}
#endif /* !NO_BACKUP */
if ((s = writeout(bp, bp->b_fname)) == TRUE) {
#ifndef NO_BACKUP
bp->b_flag &= ~(BFCHG | BFBAK);
#else /* !NO_BACKUP */
bp->b_flag &= ~BFCHG;
#endif /* !NO_BACKUP */
upmodes(bp);
}
return s;
}
#ifndef NO_BACKUP
/*
* 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. Only
* used when BACKUP is #defined.
*/
/* ARGSUSED */
int
makebkfile(f, n)
int f, n;
{
if (f & FFARG)
makebackup = n > 0;
else
makebackup = !makebackup;
ewprintf("Backup files %sabled", makebackup ? "en" : "dis");
return TRUE;
}
#endif /* !NO_BACKUP */
/*
* 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.
*/
int
writeout(bp, fn)
BUFFER *bp;
char *fn;
{
int s;
/* open writes message */
if ((s = ffwopen(fn, bp)) != FIOSUC)
return (FALSE);
s = ffputbuf(bp);
if (s == FIOSUC) {
/* no write error */
s = ffclose(bp);
if (s == FIOSUC)
ewprintf("Wrote %s", fn);
} else
/* ignore close error if it is a write error */
(VOID)ffclose(bp);
return s == FIOSUC;
}
/*
* Tag all windows for bp (all windows if bp == NULL) as needing their
* mode line updated.
*/
VOID
upmodes(bp)
BUFFER *bp;
{
MGWIN *wp;
for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
if (bp == NULL || curwp->w_bufp == bp)
wp->w_flag |= WFMODE;
}