/* $OpenBSD: file.c,v 1.84 2012/08/30 21:36:48 lum Exp $ */ /* This file is in the public domain. */ /* * File commands. */ #include "def.h" #include #include 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. 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 ((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) { struct buffer *bp; char fname[NFILEN], *bufp, *adjf; int status; 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); status = killbuffer(curbp); if (status == ABORT || status == FALSE) return (ABORT); adjf = adjustname(fname, TRUE); if (adjf == NULL) return (FALSE); 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 ((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); } /* * Given a file name, either find the buffer it uses, or create a new * empty buffer to put it in. */ struct buffer * findbuffer(char *fn) { struct buffer *bp; char bname[NBUFN], fname[NBUFN]; if (strlcpy(fname, fn, sizeof(fname)) >= sizeof(fname)) { ewprintf("filename too long"); return (NULL); } for (bp = bheadp; bp != NULL; bp = bp->b_bufp) { if (strcmp(bp->b_fname, fname) == 0) return (bp); } /* Not found. Create a new one, adjusting name first */ if (augbname(bname, fname, sizeof(bname)) == FALSE) return (NULL); bp = bfind(bname, TRUE); return (bp); } /* * 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; /* 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) { 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) { dp = dirname(fname); if (stat(dp, &statbuf) == -1 && errno == ENOENT) { /* no read-only; like emacs */ ewprintf("Parent directory missing"); } 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) { 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) { 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: 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) { 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); } return (s); } /* * Save the contents of the current buffer back into its associated file. */ #ifndef MAKEBACKUP #define MAKEBACKUP TRUE #endif /* !MAKEBACKUP */ static int makebackup = MAKEBACKUP; /* 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') { 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); } 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; dp = dirname(fn); if (stat(fn, &statbuf) == -1 && errno == ENOENT) { errno = 0; if (access(dp, W_OK) && errno == EACCES) { ewprintf("Directory %s%s write-protected", dp, (dp[0] == '/' && dp[1] == '\0') ? "" : "/"); return (FIOERR); } else if (errno == ENOENT) { ewprintf("%s%s: no such directory", dp, (dp[0] == '/' && dp[1] == '\0') ? "" : "/"); 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); 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)); }