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- /*
- * The routines in this file
- * handle the reading and writing of
- * disk files. All of details about the
- * reading and writing of the disk are
- * in "fileio.c".
- */
- #include <stdio.h>
- #include "ed.h"
-
- /*
- * Read a file into the current
- * buffer. This is really easy; all you do it
- * find the name of the file, and call the standard
- * "read a file into the current buffer" code.
- * Bound to "C-X C-R".
- */
- fileread(f, n)
- {
- register int s;
- char fname[NFILEN];
-
- if ((s=mlreply("Read file: ", fname, NFILEN)) != TRUE)
- return (s);
- return (readin(fname));
- }
-
- /*
- * 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.
- * Bound to C-X C-V.
- */
-
- filevisit(f, n)
- {
- register int s;
- char fname[NFILEN];
-
- if ((s=mlreply("Visit file: ", fname, NFILEN)) != TRUE)
- return (s);
- s = flvisit(fname);
- return(s);
- }
-
- flvisit(fname)
- char *fname;
- {
- register BUFFER *bp;
- register WINDOW *wp;
- register LINE *lp;
- register int i;
- register int s;
- char bname[NBUFN];
-
- for (bp=bheadp; bp; bp=bp->b_bufp) {
- if (!(bp->b_flag&BFTEMP) && !strcmp(bp->b_fname, fname)) {
- if (!--curbp->b_nwnd) {
- curbp->b_dotp = curwp->w_dotp;
- curbp->b_doto = curwp->w_doto;
- curbp->b_markp = curwp->w_markp;
- curbp->b_marko = curwp->w_marko;
- }
- curbp = bp;
- curwp->w_bufp = bp;
- if (!bp->b_nwnd++) {
- curwp->w_dotp = bp->b_dotp;
- curwp->w_doto = bp->b_doto;
- curwp->w_markp = bp->b_markp;
- curwp->w_marko = bp->b_marko;
- } else {
- for (wp = wheadp; wp; wp = wp->w_wndp) {
- if (wp!=curwp && wp->w_bufp==bp) {
- curwp->w_dotp = wp->w_dotp;
- curwp->w_doto = wp->w_doto;
- curwp->w_markp = wp->w_markp;
- curwp->w_marko = wp->w_marko;
- break;
- }
- }
- }
- lp = curwp->w_dotp;
- i = curwp->w_ntrows/2;
- while (i-- && lback(lp)!=curbp->b_linep)
- lp = lback(lp);
- curwp->w_linep = lp;
- curwp->w_flag |= WFMODE|WFHARD;
- mlwrite("[Old buffer]");
- return (TRUE);
- }
- }
- makename(bname, fname); /* New buffer name. */
- while (bp=bfind(bname, FALSE, 0)) {
- s = mlreply("Buffer name: ", bname, NBUFN);
- if (s == ABORT) /* ^G to just quit */
- return (s);
- if (s == FALSE) { /* CR to clobber it */
- makename(bname, fname);
- break;
- }
- }
- if (!bp && !(bp=bfind(bname, TRUE, 0))) {
- mlwrite("Cannot create buffer");
- return (FALSE);
- }
- if (!--curbp->b_nwnd) { /* Undisplay. */
- curbp->b_dotp = curwp->w_dotp;
- curbp->b_doto = curwp->w_doto;
- curbp->b_markp = curwp->w_markp;
- curbp->b_marko = curwp->w_marko;
- }
- curbp = bp; /* Switch to it. */
- curwp->w_bufp = bp;
- curbp->b_nwnd++;
- return (readin(fname)); /* Read it in. */
- }
-
- /*
- * Read file "fname" into the current
- * buffer, blowing away any text found there. Called
- * by both the read and visit commands. Return the final
- * status of the read. Also called by the mainline,
- * to read in a file specified on the command line as
- * an argument.
- */
- readin(fname)
- char fname[];
- {
- register LINE *lp1;
- register LINE *lp2;
- register int i;
- register WINDOW *wp;
- register BUFFER *bp;
- register int s;
- register int nbytes;
- register int nline;
- char line[NLINE];
-
- bp = curbp; /* Cheap. */
- if ((s=bclear(bp)) != TRUE) /* Might be old. */
- return (s);
- bp->b_flag &= ~(BFTEMP|BFCHG);
- strcpy(bp->b_fname, fname);
- if ((s=ffropen(fname)) == FIOERR) /* Hard file open. */
- goto out;
- if (s == FIOFNF) { /* File not found. */
- mlwrite("[New file]");
- goto out;
- }
- mlwrite("[Reading file]");
- for (nline = 0; (s=ffgetline(line, NLINE)) == FIOSUC; ++nline) {
- nbytes = strlen(line);
- if (!(lp1=lalloc(nbytes))) {
- s = FIOERR; /* Keep message on the */
- break; /* display. */
- }
- lp2 = lback(curbp->b_linep);
- lp2->l_fp = lp1;
- lp1->l_fp = curbp->b_linep;
- lp1->l_bp = lp2;
- curbp->b_linep->l_bp = lp1;
- for (i=0; i<nbytes; ++i) lputc(lp1, i, line[i]);
- }
- ffclose(); /* Ignore errors. */
- if (s == FIOEOF) { /* Don't zap message! */
- if (nline == 1)
- mlwrite("[Read 1 line]");
- else
- mlwrite("[Read %d lines]", nline);
- }
- out:
- for (wp=wheadp; wp; wp=wp->w_wndp) {
- if (wp->w_bufp == curbp) {
- wp->w_linep = lforw(curbp->b_linep);
- wp->w_dotp = lforw(curbp->b_linep);
- wp->w_doto = wp->w_markp = wp->w_marko = 0;
- wp->w_flag |= WFMODE|WFHARD;
- }
- }
- if (s == FIOERR) /* False if error. */
- return (FALSE);
- return (TRUE);
- }
-
- /*
- * Take a file name, and from it
- * fabricate a buffer name. This routine knows
- * about the syntax of file names on the target system.
- * I suppose that this information could be put in
- * a better place than a line of code.
- */
- makename(bname, fname)
- char bname[];
- char fname[];
- {
- register char *cp1;
- register char *cp2;
-
- for (cp1 = fname; *cp1; ++cp1) {};
- while (cp1!=fname && cp1[-1]!=':' && cp1[-1]!='\\') --cp1;
- cp2 = bname;
- while (cp2!=bname+NBUFN-1 && *cp1 && *cp1!=';') *cp2++ = *cp1++;
- *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. Bound to "C-X C-W".
- */
- filewrite(f, n)
- {
- register WINDOW *wp;
- register int s;
- char fname[NFILEN];
-
- if ((s=mlreply("Write file: ", fname, NFILEN)) != TRUE)
- return (s);
- if ((s=writeout(fname)) == TRUE) {
- strcpy(curbp->b_fname, fname);
- curbp->b_flag &= ~BFCHG;
-
- /* Update mode lines */
-
- for (wp = wheadp; wp; wp = wp->w_wndp) {
- if (wp->w_bufp == curbp) wp->w_flag |= WFMODE;
- }
- }
- return (s);
- }
-
- /*
- * Save the contents of the current
- * buffer in its associated file. Does nothing
- * if nothing has changed (this may be a bug, not a
- * feature). Error if there is no remembered file
- * name for the buffer. Bound to "C-X C-S". May
- * get called by "C-Z".
- */
- filesave(f, n)
- {
- register WINDOW *wp;
- register int s;
-
- if (!(curbp->b_flag&BFCHG)) { /* Return, no changes. */
- mlwrite("No changes - no need to write");
- return (TRUE);
- }
- if (!*curbp->b_fname) { /* Must have a name. */
- mlwrite("No file name");
- return (FALSE);
- }
- if ((s=writeout(curbp->b_fname)) == TRUE) {
- curbp->b_flag &= ~BFCHG;
-
- /* Update mode lines */
-
- for (wp = wheadp; wp; wp = wp->w_wndp) {
- if (wp->w_bufp == curbp)
- wp->w_flag |= WFMODE;
- }
- }
- return (s);
- }
-
- /*
- * This function performs the details of file
- * writing. Uses the file management routines in the
- * "fileio.c" package. The number of lines written is
- * displayed. Sadly, it looks inside a LINE; provide
- * a macro for this. Most of the grief is error
- * checking of some sort.
- */
- writeout(fn)
- char *fn;
- {
- register int s;
- register LINE *lp;
- register int nline;
-
- if ((s=ffwopen(fn)) != FIOSUC) /* Open writes message. */
- return (FALSE);
- lp = lforw(curbp->b_linep); /* First line. */
-
- /* Number of lines. */
-
- for (nline = 0; lp != curbp->b_linep; ++nline) {
- if ((s=ffputline(lp->l_text, llength(lp))) != FIOSUC)
- break;
- lp = lforw(lp);
- }
- if (s == FIOSUC) { /* No write error. */
- s = weof(); /* write eof mark */
- s = ffclose();
- if (s == FIOSUC) { /* No close error. */
- if (nline == 1)
- mlwrite("[Wrote 1 line]");
- else
- mlwrite("[Wrote %d lines]", nline);
- }
- } else /* Ignore close error */
- ffclose(); /* if a write error. */
- return (s == FIOSUC); /* Some sort of error. */
- }
-