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file.c
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C/C++ Source or Header
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1990-05-23
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14KB
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542 lines
/*
* File commands.
*/
#include "no_backup.h"
#include "makebackup.h"
#include "def.h"
#include "line.h"
#include "buffer.h"
#include "window.h"
#ifdef ANSI
#include <string.h>
#include <stdlib.h>
#endif
struct buffer *findbuffer();
VOID
makename(), upmodes();
static char *itos();
#ifndef NO_PROTO
static char *itos
PROTO((char *bufp, unsigned int num));
#endif
/*
* insert a file into the current buffer. Real easy - just call the
* insertfile routine with the file name.
*/
/* ARGSUSED */
fileinsert(f, n)
{
register int s;
char fname[NFILEN];
if ((s = ereply("Insert file: ", fname, NFILEN)) != TRUE)
return (s);
return insertfile(adjustname(fname), (char *) NULL);
/* don't set buffer name */
}
/*
* Select a file for editing. Look around to see if you can find the fine 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 */
filevisit(f, n)
{
register struct buffer *bp;
int s;
char fname[NFILEN];
char *adjf;
if ((s = ereply("Find file: ", fname, NFILEN)) != 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); /* Read it in. */
return TRUE;
}
/*
* Pop to a file in the other window. Same as last function, just popbuf
* instead of showbuffer.
*/
/* ARGSUSED */
poptofile(f, n)
{
register struct buffer *bp;
register struct window *wp;
int s;
char fname[NFILEN];
char *adjf;
if ((s = ereply("Find file in other window: ", fname, NFILEN)) != 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); /* Read it in. */
return TRUE;
}
/*
* reads the file being edited back into the buffer, throwing away changes.
*/
revertbuffer(f, n)
{
int s;
char prompt[NLINE];
if (curbp->b_fname[0] == '\0') {
ewprintf("Buffer does not seem to be associated with any file");
return TRUE;
}
strcpy(prompt, "Revert buffer from file ");
strcat(prompt, curbp->b_fname);
if ((s = eyesno(prompt)) != TRUE)
return s;
curbp->b_flag &= ~BFCHG;/* Don't ask, just chung it */
readin(curbp->b_fname);
}
/*
* given a file name, either find the buffer it uses, or create a new empty
* buffer to put it in.
*/
struct buffer *
findbuffer(fname)
char *fname;
{
register struct buffer *bp;
char bname[NBUFN], *cp;
unsigned count = 0;
for (bp = bheadp; bp != NULL; bp = bp->b_bufp) {
if (fncmp(bp->b_fname, fname) == 0)
return bp;
}
makename(bname, fname); /* New buffer name. */
cp = bname + strlen(bname);
while (bfind(bname, FALSE) != NULL) {
*cp = '<'; /* add "<count>" to then name */
(VOID) strcpy(itos(cp, count += 1) + 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 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").
*/
readin(fname)
char *fname;
{
register int status;
register struct window *wp;
if (bclear(curbp) != TRUE) /* Might be old. */
return TRUE;
status = insertfile(fname, fname);
#ifdef FOOB
curbp->b_foob = getfoob(fname);
#endif
curbp->b_flag &= ~BFCHG;/* No change. */
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;
}
/*
* 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).
*/
insertfile(fname, newname)
char fname[], newname[];
{
register struct line *lp1;
register struct line *lp2;
register struct window *wp;
int nbytes;
struct line *olp; /* Line we started at */
int opos; /* and offset into it */
int s, nline;
struct buffer *bp;
char line[NLINE];
bp = curbp; /* Cheap. */
if (newname != (char *) NULL)
(VOID) strcpy(bp->b_fname, newname);
if ((s = ffropen(fname)) == FIOERR) /* Hard file open. */
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);
}
nline = 0; /* Don't count fake line at end */
while ((s = ffgetline(line, NLINE, &nbytes)) != FIOERR) {
switch (s) {
case FIOSUC:
++nline;
/* and continue */
case FIOEOF: /* the last line of the file */
if ((lp1 = lalloc(nbytes)) == NULL) {
s = FIOERR; /* Keep message on the */
goto endoffile; /* display. */
}
bcopy(line, <ext(lp1)[0], nbytes);
lineread: 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 to long to fit in our buffer */
char *cp;
char *cp2 = 0; /* For lint */
int i;
nbytes = 0;
for (;;) {
if ((cp = (char *) malloc((unsigned) (nbytes + NLINE))) == NULL) {
ewprintf("Could not allocate %d bytes",
nbytes + NLINE);
s = FIOERR;
if (nbytes)
free(cp2);
goto endoffile;
}
if (nbytes) {
bcopy(cp2, cp, nbytes);
free(cp2);
}
bcopy(line, cp + nbytes, NLINE);
nbytes += NLINE;
switch (s = ffgetline(line, NLINE, &i)) {
case FIOERR:
free(cp);
goto endoffile;
case FIOLONG:
cp2 = cp;
break;
case FIOEOF:
case FIOSUC:
if ((lp1 = lalloc(nbytes + i)) == NULL) {
s = FIOERR;
free(cp);
goto endoffile;
}
bcopy(cp, <ext(lp1)[0], nbytes);
bcopy(line, <ext(lp1)[nbytes], i);
goto lineread;
}
}
}
default:
ewprintf("Unknown code %d reading file", s);
s = FIOERR;
break;
}
}
endoffile:
(VOID) ffclose(); /* Ignore errors. */
if (s == FIOEOF) { /* Don't zap an error. */
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
bp->b_flag |= BFCHG;
#endif
/*
* 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 {
(VOID) ldelnewline(); /* delete extranious newline */
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 s != FIOERR; /* False if error. */
}
/*
* Take a file name, and from it fabricate a buffer name. This routine knows
* about the syntax of file names on the target system. BDC1 left
* scan delimiter. BDC2 optional second left scan delimiter. BDC3
* ptional right scan delimiter.
*/
VOID
makename(bname, fname)
char bname[];
char fname[];
{
register char *cp1;
register char *cp2;
cp1 = &fname[0];
while (*cp1 != 0)
++cp1;
--cp1; /* insure at least 1 character ! */
#ifdef BDC2
while (cp1 != &fname[0] && cp1[-1] != BDC1 && cp1[-1] != BDC2)
--cp1;
#else
while (cp1 != &fname[0] && cp1[-1] != BDC1)
--cp1;
#endif
cp2 = &bname[0];
#ifdef BDC3
while (cp2 != &bname[NBUFN - 1] && *cp1 != 0 && *cp1 != BDC3)
*cp2++ = *cp1++;
#else
while (cp2 != &bname[NBUFN - 1] && *cp1 != 0)
*cp2++ = *cp1++;
#endif
*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 */
filewrite(f, n)
{
register int s, count = 0;
char fname[NFILEN], bname[NBUFN];
register char *adjfname, *cp;
if ((s = ereply("Write file: ", fname, NFILEN)) != TRUE)
return (s);
adjfname = adjustname(fname);
if ((s = writeout(curbp, adjfname)) == TRUE) {
(VOID) strcpy(curbp->b_fname, adjfname);
makename(bname, fname);
cp = bname + strlen(bname);
while (bfind(bname, FALSE) != NULL) {
*cp = '<';
strcpy(itos(cp, count += 1) + 1, ">");
}
if ((cp = (char *) malloc(strlen(bname) + 1)) == NULL)
ewprintf("Couldn't get %d bytes", strlen(bname) + 1);
else {
free(curbp->b_bname);
strcpy(cp, bname);
curbp->b_bname = cp;
}
#ifndef NO_BACKUP
curbp->b_flag &= ~(BFBAK | BFCHG);
#else
curbp->b_flag &= ~BFCHG;
#endif
upmodes(curbp);
}
return s;
}
/*
* Save the contents of the current buffer back into its associated file.
*/
#ifndef NO_BACKUP
static int makebackup = MAKEBACKUP;
#endif
/* ARGSUSED */
filesave(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.
*/
buffsave(bp)
struct buffer *bp;
{
register int s;
if ((bp->b_flag & BFCHG) == 0) { /* Return, no changes. */
ewprintf("(No changes need to be saved)");
return TRUE;
}
if (bp->b_fname[0] == '\0') { /* Must have a name. */
ewprintf("No file name");
return (FALSE);
}
#ifndef NO_BACKUP
if (makebackup && (bp->b_flag & BFBAK)) {
s = fbackupfile(bp->b_fname);
if (s == ABORT) /* Hard error. */
return FALSE;
if (s == FALSE /* Softer error. */
&& (s = eyesno("Backup error, save anyway")) != TRUE)
return s;
}
#endif
if ((s = writeout(bp, bp->b_fname)) == TRUE) {
#ifndef NO_BACKUP
bp->b_flag &= ~(BFCHG | BFBAK);
#else
bp->b_flag &= ~BFCHG;
#endif
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 */
makebkfile(f, n)
{
if (f & FFARG)
makebackup = n > 0;
else
makebackup = !makebackup;
ewprintf("Backup files %sabled", makebackup ? "en" : "dis");
return TRUE;
}
#endif
/*
* 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.
*/
writeout(bp, fn)
register struct buffer *bp;
char *fn;
{
register int s;
if ((s = ffwopen(fn)) != FIOSUC) /* Open writes message. */
return (FALSE);
s = ffputbuf(bp);
if (s == FIOSUC) { /* No write error. */
s = ffclose();
if (s == FIOSUC)
ewprintf("Wrote %s", fn);
} else /* Ignore close error */
(VOID) ffclose(); /* if a write error. */
#ifdef FOOB
putfoob(fn, bp->b_foob);
#endif
return s == FIOSUC;
}
/*
* Tag all windows for bp (all windows if bp NULL) as needing their mode line
* updated.
*/
VOID
upmodes(bp)
register struct buffer *bp;
{
register struct window *wp;
for (wp = wheadp; wp != NULL; wp = wp->w_wndp)
if (bp == NULL || wp->w_bufp == bp)
wp->w_flag |= WFMODE;
}