/* vi:set ts=8 sts=4 sw=4 noet: * * VIM - Vi IMproved by Bram Moolenaar * * Do ":help uganda" in Vim to read copying and usage conditions. * Do ":help credits" in Vim to see a list of people who contributed. * See README.txt for an overview of the Vim source code. */ /* * bufwrite.c: functions for writing a buffer */ #include "vim.h" #if defined(HAVE_UTIME) && defined(HAVE_UTIME_H) # include // for struct utimbuf #endif #define SMALLBUFSIZE 256 // size of emergency write buffer /* * Structure to pass arguments from buf_write() to buf_write_bytes(). */ struct bw_info { int bw_fd; // file descriptor char_u *bw_buf; // buffer with data to be written int bw_len; // length of data int bw_flags; // FIO_ flags #ifdef FEAT_CRYPT buf_T *bw_buffer; // buffer being written int bw_finish; // finish encrypting #endif char_u bw_rest[CONV_RESTLEN]; // not converted bytes int bw_restlen; // nr of bytes in bw_rest[] int bw_first; // first write call char_u *bw_conv_buf; // buffer for writing converted chars size_t bw_conv_buflen; // size of bw_conv_buf int bw_conv_error; // set for conversion error linenr_T bw_conv_error_lnum; // first line with error or zero linenr_T bw_start_lnum; // line number at start of buffer #ifdef USE_ICONV iconv_t bw_iconv_fd; // descriptor for iconv() or -1 #endif }; /* * Convert a Unicode character to bytes. * Return TRUE for an error, FALSE when it's OK. */ static int ucs2bytes( unsigned c, // in: character char_u **pp, // in/out: pointer to result int flags) // FIO_ flags { char_u *p = *pp; int error = FALSE; int cc; if (flags & FIO_UCS4) { if (flags & FIO_ENDIAN_L) { *p++ = c; *p++ = (c >> 8); *p++ = (c >> 16); *p++ = (c >> 24); } else { *p++ = (c >> 24); *p++ = (c >> 16); *p++ = (c >> 8); *p++ = c; } } else if (flags & (FIO_UCS2 | FIO_UTF16)) { if (c >= 0x10000) { if (flags & FIO_UTF16) { // Make two words, ten bits of the character in each. First // word is 0xd800 - 0xdbff, second one 0xdc00 - 0xdfff c -= 0x10000; if (c >= 0x100000) error = TRUE; cc = ((c >> 10) & 0x3ff) + 0xd800; if (flags & FIO_ENDIAN_L) { *p++ = cc; *p++ = ((unsigned)cc >> 8); } else { *p++ = ((unsigned)cc >> 8); *p++ = cc; } c = (c & 0x3ff) + 0xdc00; } else error = TRUE; } if (flags & FIO_ENDIAN_L) { *p++ = c; *p++ = (c >> 8); } else { *p++ = (c >> 8); *p++ = c; } } else // Latin1 { if (c >= 0x100) { error = TRUE; *p++ = 0xBF; } else *p++ = c; } *pp = p; return error; } /* * Call write() to write a number of bytes to the file. * Handles encryption and 'encoding' conversion. * * Return FAIL for failure, OK otherwise. */ static int buf_write_bytes(struct bw_info *ip) { int wlen; char_u *buf = ip->bw_buf; // data to write int len = ip->bw_len; // length of data int flags = ip->bw_flags; // extra flags // Skip conversion when writing the crypt magic number or the BOM. if (!(flags & FIO_NOCONVERT)) { char_u *p; unsigned c; int n; if (flags & FIO_UTF8) { // Convert latin1 in the buffer to UTF-8 in the file. p = ip->bw_conv_buf; // translate to buffer for (wlen = 0; wlen < len; ++wlen) p += utf_char2bytes(buf[wlen], p); buf = ip->bw_conv_buf; len = (int)(p - ip->bw_conv_buf); } else if (flags & (FIO_UCS4 | FIO_UTF16 | FIO_UCS2 | FIO_LATIN1)) { // Convert UTF-8 bytes in the buffer to UCS-2, UCS-4, UTF-16 or // Latin1 chars in the file. if (flags & FIO_LATIN1) p = buf; // translate in-place (can only get shorter) else p = ip->bw_conv_buf; // translate to buffer for (wlen = 0; wlen < len; wlen += n) { if (wlen == 0 && ip->bw_restlen != 0) { int l; // Use remainder of previous call. Append the start of // buf[] to get a full sequence. Might still be too // short! l = CONV_RESTLEN - ip->bw_restlen; if (l > len) l = len; mch_memmove(ip->bw_rest + ip->bw_restlen, buf, (size_t)l); n = utf_ptr2len_len(ip->bw_rest, ip->bw_restlen + l); if (n > ip->bw_restlen + len) { // We have an incomplete byte sequence at the end to // be written. We can't convert it without the // remaining bytes. Keep them for the next call. if (ip->bw_restlen + len > CONV_RESTLEN) return FAIL; ip->bw_restlen += len; break; } if (n > 1) c = utf_ptr2char(ip->bw_rest); else c = ip->bw_rest[0]; if (n >= ip->bw_restlen) { n -= ip->bw_restlen; ip->bw_restlen = 0; } else { ip->bw_restlen -= n; mch_memmove(ip->bw_rest, ip->bw_rest + n, (size_t)ip->bw_restlen); n = 0; } } else { n = utf_ptr2len_len(buf + wlen, len - wlen); if (n > len - wlen) { // We have an incomplete byte sequence at the end to // be written. We can't convert it without the // remaining bytes. Keep them for the next call. if (len - wlen > CONV_RESTLEN) return FAIL; ip->bw_restlen = len - wlen; mch_memmove(ip->bw_rest, buf + wlen, (size_t)ip->bw_restlen); break; } if (n > 1) c = utf_ptr2char(buf + wlen); else c = buf[wlen]; } if (ucs2bytes(c, &p, flags) && !ip->bw_conv_error) { ip->bw_conv_error = TRUE; ip->bw_conv_error_lnum = ip->bw_start_lnum; } if (c == NL) ++ip->bw_start_lnum; } if (flags & FIO_LATIN1) len = (int)(p - buf); else { buf = ip->bw_conv_buf; len = (int)(p - ip->bw_conv_buf); } } #ifdef MSWIN else if (flags & FIO_CODEPAGE) { // Convert UTF-8 or codepage to UCS-2 and then to MS-Windows // codepage. char_u *from; size_t fromlen; char_u *to; int u8c; BOOL bad = FALSE; int needed; if (ip->bw_restlen > 0) { // Need to concatenate the remainder of the previous call and // the bytes of the current call. Use the end of the // conversion buffer for this. fromlen = len + ip->bw_restlen; from = ip->bw_conv_buf + ip->bw_conv_buflen - fromlen; mch_memmove(from, ip->bw_rest, (size_t)ip->bw_restlen); mch_memmove(from + ip->bw_restlen, buf, (size_t)len); } else { from = buf; fromlen = len; } to = ip->bw_conv_buf; if (enc_utf8) { // Convert from UTF-8 to UCS-2, to the start of the buffer. // The buffer has been allocated to be big enough. while (fromlen > 0) { n = (int)utf_ptr2len_len(from, (int)fromlen); if (n > (int)fromlen) // incomplete byte sequence break; u8c = utf_ptr2char(from); *to++ = (u8c & 0xff); *to++ = (u8c >> 8); fromlen -= n; from += n; } // Copy remainder to ip->bw_rest[] to be used for the next // call. if (fromlen > CONV_RESTLEN) { // weird overlong sequence ip->bw_conv_error = TRUE; return FAIL; } mch_memmove(ip->bw_rest, from, fromlen); ip->bw_restlen = (int)fromlen; } else { // Convert from enc_codepage to UCS-2, to the start of the // buffer. The buffer has been allocated to be big enough. ip->bw_restlen = 0; needed = MultiByteToWideChar(enc_codepage, MB_ERR_INVALID_CHARS, (LPCSTR)from, (int)fromlen, NULL, 0); if (needed == 0) { // When conversion fails there may be a trailing byte. needed = MultiByteToWideChar(enc_codepage, MB_ERR_INVALID_CHARS, (LPCSTR)from, (int)fromlen - 1, NULL, 0); if (needed == 0) { // Conversion doesn't work. ip->bw_conv_error = TRUE; return FAIL; } // Save the trailing byte for the next call. ip->bw_rest[0] = from[fromlen - 1]; ip->bw_restlen = 1; } needed = MultiByteToWideChar(enc_codepage, MB_ERR_INVALID_CHARS, (LPCSTR)from, (int)(fromlen - ip->bw_restlen), (LPWSTR)to, needed); if (needed == 0) { // Safety check: Conversion doesn't work. ip->bw_conv_error = TRUE; return FAIL; } to += needed * 2; } fromlen = to - ip->bw_conv_buf; buf = to; # ifdef CP_UTF8 // VC 4.1 doesn't define CP_UTF8 if (FIO_GET_CP(flags) == CP_UTF8) { // Convert from UCS-2 to UTF-8, using the remainder of the // conversion buffer. Fails when out of space. for (from = ip->bw_conv_buf; fromlen > 1; fromlen -= 2) { u8c = *from++; u8c += (*from++ << 8); to += utf_char2bytes(u8c, to); if (to + 6 >= ip->bw_conv_buf + ip->bw_conv_buflen) { ip->bw_conv_error = TRUE; return FAIL; } } len = (int)(to - buf); } else # endif { // Convert from UCS-2 to the codepage, using the remainder of // the conversion buffer. If the conversion uses the default // character "0", the data doesn't fit in this encoding, so // fail. len = WideCharToMultiByte(FIO_GET_CP(flags), 0, (LPCWSTR)ip->bw_conv_buf, (int)fromlen / sizeof(WCHAR), (LPSTR)to, (int)(ip->bw_conv_buflen - fromlen), 0, &bad); if (bad) { ip->bw_conv_error = TRUE; return FAIL; } } } #endif #ifdef MACOS_CONVERT else if (flags & FIO_MACROMAN) { // Convert UTF-8 or latin1 to Apple MacRoman. char_u *from; size_t fromlen; if (ip->bw_restlen > 0) { // Need to concatenate the remainder of the previous call and // the bytes of the current call. Use the end of the // conversion buffer for this. fromlen = len + ip->bw_restlen; from = ip->bw_conv_buf + ip->bw_conv_buflen - fromlen; mch_memmove(from, ip->bw_rest, (size_t)ip->bw_restlen); mch_memmove(from + ip->bw_restlen, buf, (size_t)len); } else { from = buf; fromlen = len; } if (enc2macroman(from, fromlen, ip->bw_conv_buf, &len, ip->bw_conv_buflen, ip->bw_rest, &ip->bw_restlen) == FAIL) { ip->bw_conv_error = TRUE; return FAIL; } buf = ip->bw_conv_buf; } #endif #ifdef USE_ICONV if (ip->bw_iconv_fd != (iconv_t)-1) { const char *from; size_t fromlen; char *to; size_t tolen; // Convert with iconv(). if (ip->bw_restlen > 0) { char *fp; // Need to concatenate the remainder of the previous call and // the bytes of the current call. Use the end of the // conversion buffer for this. fromlen = len + ip->bw_restlen; fp = (char *)ip->bw_conv_buf + ip->bw_conv_buflen - fromlen; mch_memmove(fp, ip->bw_rest, (size_t)ip->bw_restlen); mch_memmove(fp + ip->bw_restlen, buf, (size_t)len); from = fp; tolen = ip->bw_conv_buflen - fromlen; } else { from = (const char *)buf; fromlen = len; tolen = ip->bw_conv_buflen; } to = (char *)ip->bw_conv_buf; if (ip->bw_first) { size_t save_len = tolen; // output the initial shift state sequence (void)iconv(ip->bw_iconv_fd, NULL, NULL, &to, &tolen); // There is a bug in iconv() on Linux (which appears to be // wide-spread) which sets "to" to NULL and messes up "tolen". if (to == NULL) { to = (char *)ip->bw_conv_buf; tolen = save_len; } ip->bw_first = FALSE; } // If iconv() has an error or there is not enough room, fail. if ((iconv(ip->bw_iconv_fd, (void *)&from, &fromlen, &to, &tolen) == (size_t)-1 && ICONV_ERRNO != ICONV_EINVAL) || fromlen > CONV_RESTLEN) { ip->bw_conv_error = TRUE; return FAIL; } // copy remainder to ip->bw_rest[] to be used for the next call. if (fromlen > 0) mch_memmove(ip->bw_rest, (void *)from, fromlen); ip->bw_restlen = (int)fromlen; buf = ip->bw_conv_buf; len = (int)((char_u *)to - ip->bw_conv_buf); } #endif } if (ip->bw_fd < 0) // Only checking conversion, which is OK if we get here. return OK; #ifdef FEAT_CRYPT if (flags & FIO_ENCRYPTED) { // Encrypt the data. Do it in-place if possible, otherwise use an // allocated buffer. # ifdef CRYPT_NOT_INPLACE if (crypt_works_inplace(ip->bw_buffer->b_cryptstate)) { # endif crypt_encode_inplace(ip->bw_buffer->b_cryptstate, buf, len, ip->bw_finish); # ifdef CRYPT_NOT_INPLACE } else { char_u *outbuf; len = crypt_encode_alloc(curbuf->b_cryptstate, buf, len, &outbuf, ip->bw_finish); if (len == 0) return OK; // Crypt layer is buffering, will flush later. wlen = write_eintr(ip->bw_fd, outbuf, len); vim_free(outbuf); return (wlen < len) ? FAIL : OK; } # endif } #endif wlen = write_eintr(ip->bw_fd, buf, len); return (wlen < len) ? FAIL : OK; } /* * Check modification time of file, before writing to it. * The size isn't checked, because using a tool like "gzip" takes care of * using the same timestamp but can't set the size. */ static int check_mtime(buf_T *buf, stat_T *st) { if (buf->b_mtime_read != 0 && time_differs(st, buf->b_mtime_read, buf->b_mtime_read_ns)) { msg_scroll = TRUE; // don't overwrite messages here msg_silent = 0; // must give this prompt // don't use emsg() here, don't want to flush the buffers msg_attr(_("WARNING: The file has been changed since reading it!!!"), HL_ATTR(HLF_E)); if (ask_yesno((char_u *)_("Do you really want to write to it"), TRUE) == 'n') return FAIL; msg_scroll = FALSE; // always overwrite the file message now } return OK; } /* * Generate a BOM in "buf[4]" for encoding "name". * Return the length of the BOM (zero when no BOM). */ static int make_bom(char_u *buf, char_u *name) { int flags; char_u *p; flags = get_fio_flags(name); // Can't put a BOM in a non-Unicode file. if (flags == FIO_LATIN1 || flags == 0) return 0; if (flags == FIO_UTF8) // UTF-8 { buf[0] = 0xef; buf[1] = 0xbb; buf[2] = 0xbf; return 3; } p = buf; (void)ucs2bytes(0xfeff, &p, flags); return (int)(p - buf); } #ifdef UNIX static void set_file_time( char_u *fname, time_t atime, // access time time_t mtime) // modification time { # if defined(HAVE_UTIME) && defined(HAVE_UTIME_H) struct utimbuf buf; buf.actime = atime; buf.modtime = mtime; (void)utime((char *)fname, &buf); # else # if defined(HAVE_UTIMES) struct timeval tvp[2]; tvp[0].tv_sec = atime; tvp[0].tv_usec = 0; tvp[1].tv_sec = mtime; tvp[1].tv_usec = 0; # ifdef NeXT (void)utimes((char *)fname, tvp); # else (void)utimes((char *)fname, (const struct timeval *)&tvp); # endif # endif # endif } #endif // UNIX char * new_file_message(void) { return shortmess(SHM_NEW) ? _("[New]") : _("[New File]"); } /* * buf_write() - write to file "fname" lines "start" through "end" * * We do our own buffering here because fwrite() is so slow. * * If "forceit" is true, we don't care for errors when attempting backups. * In case of an error everything possible is done to restore the original * file. But when "forceit" is TRUE, we risk losing it. * * When "reset_changed" is TRUE and "append" == FALSE and "start" == 1 and * "end" == curbuf->b_ml.ml_line_count, reset curbuf->b_changed. * * This function must NOT use NameBuff (because it's called by autowrite()). * * return FAIL for failure, OK otherwise */ int buf_write( buf_T *buf, char_u *fname, char_u *sfname, linenr_T start, linenr_T end, exarg_T *eap, // for forced 'ff' and 'fenc', can be // NULL! int append, // append to the file int forceit, int reset_changed, int filtering) { int fd; char_u *backup = NULL; int backup_copy = FALSE; // copy the original file? int dobackup; char_u *ffname; char_u *wfname = NULL; // name of file to write to char_u *s; char_u *ptr; char_u c; int len; linenr_T lnum; long nchars; char_u *errmsg = NULL; int errmsg_allocated = FALSE; char_u *errnum = NULL; char_u *buffer; char_u smallbuf[SMALLBUFSIZE]; char_u *backup_ext; int bufsize; long perm; // file permissions int retval = OK; int newfile = FALSE; // TRUE if file doesn't exist yet int msg_save = msg_scroll; int overwriting; // TRUE if writing over original int no_eol = FALSE; // no end-of-line written int device = FALSE; // writing to a device stat_T st_old; int prev_got_int = got_int; int checking_conversion; int file_readonly = FALSE; // overwritten file is read-only #if defined(UNIX) // XXX fix me sometime? int made_writable = FALSE; // 'w' bit has been set #endif // writing everything int whole = (start == 1 && end == buf->b_ml.ml_line_count); linenr_T old_line_count = buf->b_ml.ml_line_count; int attr; int fileformat; int write_bin; struct bw_info write_info; // info for buf_write_bytes() int converted = FALSE; int notconverted = FALSE; char_u *fenc; // effective 'fileencoding' char_u *fenc_tofree = NULL; // allocated "fenc" int wb_flags = 0; #ifdef HAVE_ACL vim_acl_T acl = NULL; // ACL copied from original file to // backup or new file #endif #ifdef FEAT_PERSISTENT_UNDO int write_undo_file = FALSE; context_sha256_T sha_ctx; #endif unsigned int bkc = get_bkc_flags(buf); pos_T orig_start = buf->b_op_start; pos_T orig_end = buf->b_op_end; if (fname == NULL || *fname == NUL) // safety check return FAIL; if (buf->b_ml.ml_mfp == NULL) { // This can happen during startup when there is a stray "w" in the // vimrc file. emsg(_(e_empty_buffer)); return FAIL; } // Disallow writing from .exrc and .vimrc in current directory for // security reasons. if (check_secure()) return FAIL; // Avoid a crash for a long name. if (STRLEN(fname) >= MAXPATHL) { emsg(_(e_name_too_long)); return FAIL; } // must init bw_conv_buf and bw_iconv_fd before jumping to "fail" write_info.bw_conv_buf = NULL; write_info.bw_conv_error = FALSE; write_info.bw_conv_error_lnum = 0; write_info.bw_restlen = 0; #ifdef USE_ICONV write_info.bw_iconv_fd = (iconv_t)-1; #endif #ifdef FEAT_CRYPT write_info.bw_buffer = buf; write_info.bw_finish = FALSE; #endif // After writing a file changedtick changes but we don't want to display // the line. ex_no_reprint = TRUE; // If there is no file name yet, use the one for the written file. // BF_NOTEDITED is set to reflect this (in case the write fails). // Don't do this when the write is for a filter command. // Don't do this when appending. // Only do this when 'cpoptions' contains the 'F' flag. if (buf->b_ffname == NULL && reset_changed && whole && buf == curbuf && !bt_nofilename(buf) && !filtering && (!append || vim_strchr(p_cpo, CPO_FNAMEAPP) != NULL) && vim_strchr(p_cpo, CPO_FNAMEW) != NULL) { if (set_rw_fname(fname, sfname) == FAIL) return FAIL; buf = curbuf; // just in case autocmds made "buf" invalid } if (sfname == NULL) sfname = fname; // For Unix: Use the short file name whenever possible. // Avoids problems with networks and when directory names are changed. // Don't do this for MS-DOS, a "cd" in a sub-shell may have moved us to // another directory, which we don't detect ffname = fname; // remember full fname #ifdef UNIX fname = sfname; #endif if (buf->b_ffname != NULL && fnamecmp(ffname, buf->b_ffname) == 0) overwriting = TRUE; else overwriting = FALSE; if (exiting) settmode(TMODE_COOK); // when exiting allow typeahead now ++no_wait_return; // don't wait for return yet // Set '[ and '] marks to the lines to be written. buf->b_op_start.lnum = start; buf->b_op_start.col = 0; buf->b_op_end.lnum = end; buf->b_op_end.col = 0; { aco_save_T aco; int buf_ffname = FALSE; int buf_sfname = FALSE; int buf_fname_f = FALSE; int buf_fname_s = FALSE; int did_cmd = FALSE; int nofile_err = FALSE; int empty_memline = (buf->b_ml.ml_mfp == NULL); bufref_T bufref; // Apply PRE autocommands. // Set curbuf to the buffer to be written. // Careful: The autocommands may call buf_write() recursively! if (ffname == buf->b_ffname) buf_ffname = TRUE; if (sfname == buf->b_sfname) buf_sfname = TRUE; if (fname == buf->b_ffname) buf_fname_f = TRUE; if (fname == buf->b_sfname) buf_fname_s = TRUE; // Set curwin/curbuf to buf and save a few things. aucmd_prepbuf(&aco, buf); if (curbuf != buf) { // Could not find a window for "buf". Doing more might cause // problems, better bail out. return FAIL; } set_bufref(&bufref, buf); if (append) { if (!(did_cmd = apply_autocmds_exarg(EVENT_FILEAPPENDCMD, sfname, sfname, FALSE, curbuf, eap))) { if (overwriting && bt_nofilename(curbuf)) nofile_err = TRUE; else apply_autocmds_exarg(EVENT_FILEAPPENDPRE, sfname, sfname, FALSE, curbuf, eap); } } else if (filtering) { apply_autocmds_exarg(EVENT_FILTERWRITEPRE, NULL, sfname, FALSE, curbuf, eap); } else if (reset_changed && whole) { int was_changed = curbufIsChanged(); did_cmd = apply_autocmds_exarg(EVENT_BUFWRITECMD, sfname, sfname, FALSE, curbuf, eap); if (did_cmd) { if (was_changed && !curbufIsChanged()) { // Written everything correctly and BufWriteCmd has reset // 'modified': Correct the undo information so that an // undo now sets 'modified'. u_unchanged(curbuf); u_update_save_nr(curbuf); } } else { if (overwriting && bt_nofilename(curbuf)) nofile_err = TRUE; else apply_autocmds_exarg(EVENT_BUFWRITEPRE, sfname, sfname, FALSE, curbuf, eap); } } else { if (!(did_cmd = apply_autocmds_exarg(EVENT_FILEWRITECMD, sfname, sfname, FALSE, curbuf, eap))) { if (overwriting && bt_nofilename(curbuf)) nofile_err = TRUE; else apply_autocmds_exarg(EVENT_FILEWRITEPRE, sfname, sfname, FALSE, curbuf, eap); } } // restore curwin/curbuf and a few other things aucmd_restbuf(&aco); // In three situations we return here and don't write the file: // 1. the autocommands deleted or unloaded the buffer. // 2. The autocommands abort script processing. // 3. If one of the "Cmd" autocommands was executed. if (!bufref_valid(&bufref)) buf = NULL; if (buf == NULL || (buf->b_ml.ml_mfp == NULL && !empty_memline) || did_cmd || nofile_err #ifdef FEAT_EVAL || aborting() #endif ) { if (buf != NULL && (cmdmod.cmod_flags & CMOD_LOCKMARKS)) { // restore the original '[ and '] positions buf->b_op_start = orig_start; buf->b_op_end = orig_end; } --no_wait_return; msg_scroll = msg_save; if (nofile_err) semsg(_(e_no_matching_autocommands_for_buftype_str_buffer), curbuf->b_p_bt); if (nofile_err #ifdef FEAT_EVAL || aborting() #endif ) // An aborting error, interrupt or exception in the // autocommands. return FAIL; if (did_cmd) { if (buf == NULL) // The buffer was deleted. We assume it was written // (can't retry anyway). return OK; if (overwriting) { // Assume the buffer was written, update the timestamp. ml_timestamp(buf); if (append) buf->b_flags &= ~BF_NEW; else buf->b_flags &= ~BF_WRITE_MASK; } if (reset_changed && buf->b_changed && !append && (overwriting || vim_strchr(p_cpo, CPO_PLUS) != NULL)) // Buffer still changed, the autocommands didn't work // properly. return FAIL; return OK; } #ifdef FEAT_EVAL if (!aborting()) #endif emsg(_(e_autocommands_deleted_or_unloaded_buffer_to_be_written)); return FAIL; } // The autocommands may have changed the number of lines in the file. // When writing the whole file, adjust the end. // When writing part of the file, assume that the autocommands only // changed the number of lines that are to be written (tricky!). if (buf->b_ml.ml_line_count != old_line_count) { if (whole) // write all end = buf->b_ml.ml_line_count; else if (buf->b_ml.ml_line_count > old_line_count) // more lines end += buf->b_ml.ml_line_count - old_line_count; else // less lines { end -= old_line_count - buf->b_ml.ml_line_count; if (end < start) { --no_wait_return; msg_scroll = msg_save; emsg(_(e_autocommands_changed_number_of_lines_in_unexpected_way)); return FAIL; } } } // The autocommands may have changed the name of the buffer, which may // be kept in fname, ffname and sfname. if (buf_ffname) ffname = buf->b_ffname; if (buf_sfname) sfname = buf->b_sfname; if (buf_fname_f) fname = buf->b_ffname; if (buf_fname_s) fname = buf->b_sfname; } if (cmdmod.cmod_flags & CMOD_LOCKMARKS) { // restore the original '[ and '] positions buf->b_op_start = orig_start; buf->b_op_end = orig_end; } #ifdef FEAT_NETBEANS_INTG if (netbeans_active() && isNetbeansBuffer(buf)) { if (whole) { // b_changed can be 0 after an undo, but we still need to write // the buffer to NetBeans. if (buf->b_changed || isNetbeansModified(buf)) { --no_wait_return; // may wait for return now msg_scroll = msg_save; netbeans_save_buffer(buf); // no error checking... return retval; } else { errnum = (char_u *)"E656: "; errmsg = (char_u *)_(e_netbeans_disallows_writes_of_unmodified_buffers); buffer = NULL; goto fail; } } else { errnum = (char_u *)"E657: "; errmsg = (char_u *)_(e_partial_writes_disallowed_for_netbeans_buffers); buffer = NULL; goto fail; } } #endif if (shortmess(SHM_OVER) && !exiting) msg_scroll = FALSE; // overwrite previous file message else msg_scroll = TRUE; // don't overwrite previous file message if (!filtering) filemess(buf, #ifndef UNIX sfname, #else fname, #endif (char_u *)"", 0); // show that we are busy msg_scroll = FALSE; // always overwrite the file message now buffer = alloc(WRITEBUFSIZE); if (buffer == NULL) // can't allocate big buffer, use small // one (to be able to write when out of // memory) { buffer = smallbuf; bufsize = SMALLBUFSIZE; } else bufsize = WRITEBUFSIZE; // Get information about original file (if there is one). #if defined(UNIX) st_old.st_dev = 0; st_old.st_ino = 0; perm = -1; if (mch_stat((char *)fname, &st_old) < 0) newfile = TRUE; else { perm = st_old.st_mode; if (!S_ISREG(st_old.st_mode)) // not a file { if (S_ISDIR(st_old.st_mode)) { errnum = (char_u *)"E502: "; errmsg = (char_u *)_(e_is_a_directory); goto fail; } if (mch_nodetype(fname) != NODE_WRITABLE) { errnum = (char_u *)"E503: "; errmsg = (char_u *)_(e_is_not_file_or_writable_device); goto fail; } // It's a device of some kind (or a fifo) which we can write to // but for which we can't make a backup. device = TRUE; newfile = TRUE; perm = -1; } } #else // !UNIX // Check for a writable device name. c = mch_nodetype(fname); if (c == NODE_OTHER) { errnum = (char_u *)"E503: "; errmsg = (char_u *)_(e_is_not_file_or_writable_device); goto fail; } if (c == NODE_WRITABLE) { # if defined(MSWIN) // MS-Windows allows opening a device, but we will probably get stuck // trying to write to it. if (!p_odev) { errnum = (char_u *)"E796: "; errmsg = (char_u *)_(e_writing_to_device_disabled_with_opendevice_option); goto fail; } # endif device = TRUE; newfile = TRUE; perm = -1; } else { perm = mch_getperm(fname); if (perm < 0) newfile = TRUE; else if (mch_isdir(fname)) { errnum = (char_u *)"E502: "; errmsg = (char_u *)_(e_is_a_directory); goto fail; } if (overwriting) (void)mch_stat((char *)fname, &st_old); } #endif // !UNIX if (!device && !newfile) { // Check if the file is really writable (when renaming the file to // make a backup we won't discover it later). file_readonly = check_file_readonly(fname, (int)perm); if (!forceit && file_readonly) { if (vim_strchr(p_cpo, CPO_FWRITE) != NULL) { errnum = (char_u *)"E504: "; errmsg = (char_u *)_(e_is_read_only_cannot_override_W_in_cpoptions); } else { errnum = (char_u *)"E505: "; errmsg = (char_u *)_(e_is_read_only_add_bang_to_override); } goto fail; } // Check if the timestamp hasn't changed since reading the file. if (overwriting) { retval = check_mtime(buf, &st_old); if (retval == FAIL) goto fail; } } #ifdef HAVE_ACL // For systems that support ACL: get the ACL from the original file. if (!newfile) acl = mch_get_acl(fname); #endif // If 'backupskip' is not empty, don't make a backup for some files. dobackup = (p_wb || p_bk || *p_pm != NUL); if (dobackup && *p_bsk != NUL && match_file_list(p_bsk, sfname, ffname)) dobackup = FALSE; // Save the value of got_int and reset it. We don't want a previous // interruption cancel writing, only hitting CTRL-C while writing should // abort it. prev_got_int = got_int; got_int = FALSE; // Mark the buffer as 'being saved' to prevent changed buffer warnings buf->b_saving = TRUE; // If we are not appending or filtering, the file exists, and the // 'writebackup', 'backup' or 'patchmode' option is set, need a backup. // When 'patchmode' is set also make a backup when appending. // // Do not make any backup, if 'writebackup' and 'backup' are both switched // off. This helps when editing large files on almost-full disks. if (!(append && *p_pm == NUL) && !filtering && perm >= 0 && dobackup) { #if defined(UNIX) || defined(MSWIN) stat_T st; #endif if ((bkc & BKC_YES) || append) // "yes" backup_copy = TRUE; #if defined(UNIX) || defined(MSWIN) else if ((bkc & BKC_AUTO)) // "auto" { int i; # ifdef UNIX // Don't rename the file when: // - it's a hard link // - it's a symbolic link // - we don't have write permission in the directory // - we can't set the owner/group of the new file if (st_old.st_nlink > 1 || mch_lstat((char *)fname, &st) < 0 || st.st_dev != st_old.st_dev || st.st_ino != st_old.st_ino # ifndef HAVE_FCHOWN || st.st_uid != st_old.st_uid || st.st_gid != st_old.st_gid # endif ) backup_copy = TRUE; else # else # ifdef MSWIN // On NTFS file systems hard links are possible. if (mch_is_linked(fname)) backup_copy = TRUE; else # endif # endif { // Check if we can create a file and set the owner/group to // the ones from the original file. // First find a file name that doesn't exist yet (use some // arbitrary numbers). STRCPY(IObuff, fname); fd = -1; for (i = 4913; ; i += 123) { sprintf((char *)gettail(IObuff), "%d", i); if (mch_lstat((char *)IObuff, &st) < 0) { fd = mch_open((char *)IObuff, O_CREAT|O_WRONLY|O_EXCL|O_NOFOLLOW, perm); if (fd < 0 && errno == EEXIST) // If the same file name is created by another // process between lstat() and open(), find another // name. continue; break; } } if (fd < 0) // can't write in directory backup_copy = TRUE; else { # ifdef UNIX # ifdef HAVE_FCHOWN vim_ignored = fchown(fd, st_old.st_uid, st_old.st_gid); # endif if (mch_stat((char *)IObuff, &st) < 0 || st.st_uid != st_old.st_uid || st.st_gid != st_old.st_gid || (long)st.st_mode != perm) backup_copy = TRUE; # endif // Close the file before removing it, on MS-Windows we // can't delete an open file. close(fd); mch_remove(IObuff); # ifdef MSWIN // MS-Windows may trigger a virus scanner to open the // file, we can't delete it then. Keep trying for half a // second. { int try; for (try = 0; try < 10; ++try) { if (mch_lstat((char *)IObuff, &st) < 0) break; ui_delay(50L, TRUE); // wait 50 msec mch_remove(IObuff); } } # endif } } } // Break symlinks and/or hardlinks if we've been asked to. if ((bkc & BKC_BREAKSYMLINK) || (bkc & BKC_BREAKHARDLINK)) { # ifdef UNIX int lstat_res; lstat_res = mch_lstat((char *)fname, &st); // Symlinks. if ((bkc & BKC_BREAKSYMLINK) && lstat_res == 0 && st.st_ino != st_old.st_ino) backup_copy = FALSE; // Hardlinks. if ((bkc & BKC_BREAKHARDLINK) && st_old.st_nlink > 1 && (lstat_res != 0 || st.st_ino == st_old.st_ino)) backup_copy = FALSE; # else # if defined(MSWIN) // Symlinks. if ((bkc & BKC_BREAKSYMLINK) && mch_is_symbolic_link(fname)) backup_copy = FALSE; // Hardlinks. if ((bkc & BKC_BREAKHARDLINK) && mch_is_hard_link(fname)) backup_copy = FALSE; # endif # endif } #endif // make sure we have a valid backup extension to use if (*p_bex == NUL) backup_ext = (char_u *)".bak"; else backup_ext = p_bex; if (backup_copy && (fd = mch_open((char *)fname, O_RDONLY | O_EXTRA, 0)) >= 0) { int bfd; char_u *copybuf, *wp; int some_error = FALSE; stat_T st_new; char_u *dirp; char_u *rootname; #if defined(UNIX) || defined(MSWIN) char_u *p; #endif #if defined(UNIX) int did_set_shortname; mode_t umask_save; #endif copybuf = alloc(WRITEBUFSIZE + 1); if (copybuf == NULL) { some_error = TRUE; // out of memory goto nobackup; } // Try to make the backup in each directory in the 'bdir' option. // // Unix semantics has it, that we may have a writable file, // that cannot be recreated with a simple open(..., O_CREAT, ) e.g: // - the directory is not writable, // - the file may be a symbolic link, // - the file may belong to another user/group, etc. // // For these reasons, the existing writable file must be truncated // and reused. Creation of a backup COPY will be attempted. dirp = p_bdir; while (*dirp) { #ifdef UNIX st_new.st_ino = 0; st_new.st_dev = 0; st_new.st_gid = 0; #endif // Isolate one directory name, using an entry in 'bdir'. (void)copy_option_part(&dirp, copybuf, WRITEBUFSIZE, ","); #if defined(UNIX) || defined(MSWIN) p = copybuf + STRLEN(copybuf); if (after_pathsep(copybuf, p) && p[-1] == p[-2]) // Ends with '//', use full path if ((p = make_percent_swname(copybuf, p, fname)) != NULL) { backup = modname(p, backup_ext, FALSE); vim_free(p); } #endif rootname = get_file_in_dir(fname, copybuf); if (rootname == NULL) { some_error = TRUE; // out of memory goto nobackup; } #if defined(UNIX) did_set_shortname = FALSE; #endif // May try twice if 'shortname' not set. for (;;) { // Make the backup file name. if (backup == NULL) backup = buf_modname((buf->b_p_sn || buf->b_shortname), rootname, backup_ext, FALSE); if (backup == NULL) { vim_free(rootname); some_error = TRUE; // out of memory goto nobackup; } // Check if backup file already exists. if (mch_stat((char *)backup, &st_new) >= 0) { #ifdef UNIX // Check if backup file is same as original file. // May happen when modname() gave the same file back. // E.g. silly link, or file name-length reached. // If we don't check here, we either ruin the file // when copying or erase it after writing. jw. if (st_new.st_dev == st_old.st_dev && st_new.st_ino == st_old.st_ino) { VIM_CLEAR(backup); // no backup file to delete // may try again with 'shortname' set if (!(buf->b_shortname || buf->b_p_sn)) { buf->b_shortname = TRUE; did_set_shortname = TRUE; continue; } // setting shortname didn't help if (did_set_shortname) buf->b_shortname = FALSE; break; } #endif // If we are not going to keep the backup file, don't // delete an existing one, try to use another name. // Change one character, just before the extension. if (!p_bk) { wp = backup + STRLEN(backup) - 1 - STRLEN(backup_ext); if (wp < backup) // empty file name ??? wp = backup; *wp = 'z'; while (*wp > 'a' && mch_stat((char *)backup, &st_new) >= 0) --*wp; // They all exist??? Must be something wrong. if (*wp == 'a') VIM_CLEAR(backup); } } break; } vim_free(rootname); // Try to create the backup file if (backup != NULL) { // remove old backup, if present mch_remove(backup); // Open with O_EXCL to avoid the file being created while // we were sleeping (symlink hacker attack?). Reset umask // if possible to avoid mch_setperm() below. #ifdef UNIX umask_save = umask(0); #endif bfd = mch_open((char *)backup, O_WRONLY|O_CREAT|O_EXTRA|O_EXCL|O_NOFOLLOW, perm & 0777); #ifdef UNIX (void)umask(umask_save); #endif if (bfd < 0) VIM_CLEAR(backup); else { // Set file protection same as original file, but // strip s-bit. Only needed if umask() wasn't used // above. #ifndef UNIX (void)mch_setperm(backup, perm & 0777); #else // Try to set the group of the backup same as the // original file. If this fails, set the protection // bits for the group same as the protection bits for // others. if (st_new.st_gid != st_old.st_gid # ifdef HAVE_FCHOWN // sequent-ptx lacks fchown() && fchown(bfd, (uid_t)-1, st_old.st_gid) != 0 # endif ) mch_setperm(backup, (perm & 0707) | ((perm & 07) << 3)); # if defined(HAVE_SELINUX) || defined(HAVE_SMACK) mch_copy_sec(fname, backup); # endif # ifdef FEAT_XATTR mch_copy_xattr(fname, backup); # endif #endif // copy the file. write_info.bw_fd = bfd; write_info.bw_buf = copybuf; write_info.bw_flags = FIO_NOCONVERT; while ((write_info.bw_len = read_eintr(fd, copybuf, WRITEBUFSIZE)) > 0) { if (buf_write_bytes(&write_info) == FAIL) { errmsg = (char_u *)_(e_cant_write_to_backup_file_add_bang_to_override); break; } ui_breakcheck(); if (got_int) { errmsg = (char_u *)_(e_interrupted); break; } } if (close(bfd) < 0 && errmsg == NULL) errmsg = (char_u *)_(e_close_error_for_backup_file_add_bang_to_write_anyway); if (write_info.bw_len < 0) errmsg = (char_u *)_(e_cant_read_file_for_backup_add_bang_to_write_anyway); #ifdef UNIX set_file_time(backup, st_old.st_atime, st_old.st_mtime); #endif #ifdef HAVE_ACL mch_set_acl(backup, acl); #endif #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) mch_copy_sec(fname, backup); #endif #ifdef FEAT_XATTR mch_copy_xattr(fname, backup); #endif #ifdef MSWIN (void)mch_copy_file_attribute(fname, backup); #endif break; } } } nobackup: close(fd); // ignore errors for closing read file vim_free(copybuf); if (backup == NULL && errmsg == NULL) errmsg = (char_u *)_(e_cannot_create_backup_file_add_bang_to_write_anyway); // ignore errors when forceit is TRUE if ((some_error || errmsg != NULL) && !forceit) { retval = FAIL; goto fail; } errmsg = NULL; } else { char_u *dirp; char_u *p; char_u *rootname; // Make a backup by renaming the original file. // If 'cpoptions' includes the "W" flag, we don't want to // overwrite a read-only file. But rename may be possible // anyway, thus we need an extra check here. if (file_readonly && vim_strchr(p_cpo, CPO_FWRITE) != NULL) { errnum = (char_u *)"E504: "; errmsg = (char_u *)_(e_is_read_only_cannot_override_W_in_cpoptions); goto fail; } // Form the backup file name - change path/fo.o.h to // path/fo.o.h.bak Try all directories in 'backupdir', first one // that works is used. dirp = p_bdir; while (*dirp) { // Isolate one directory name and make the backup file name. (void)copy_option_part(&dirp, IObuff, IOSIZE, ","); #if defined(UNIX) || defined(MSWIN) p = IObuff + STRLEN(IObuff); if (after_pathsep(IObuff, p) && p[-1] == p[-2]) // path ends with '//', use full path if ((p = make_percent_swname(IObuff, p, fname)) != NULL) { backup = modname(p, backup_ext, FALSE); vim_free(p); } #endif if (backup == NULL) { rootname = get_file_in_dir(fname, IObuff); if (rootname == NULL) backup = NULL; else { backup = buf_modname( (buf->b_p_sn || buf->b_shortname), rootname, backup_ext, FALSE); vim_free(rootname); } } if (backup != NULL) { // If we are not going to keep the backup file, don't // delete an existing one, try to use another name. // Change one character, just before the extension. if (!p_bk && mch_getperm(backup) >= 0) { p = backup + STRLEN(backup) - 1 - STRLEN(backup_ext); if (p < backup) // empty file name ??? p = backup; *p = 'z'; while (*p > 'a' && mch_getperm(backup) >= 0) --*p; // They all exist??? Must be something wrong! if (*p == 'a') VIM_CLEAR(backup); } } if (backup != NULL) { // Delete any existing backup and move the current version // to the backup. For safety, we don't remove the backup // until the write has finished successfully. And if the // 'backup' option is set, leave it around. // If the renaming of the original file to the backup file // works, quit here. if (vim_rename(fname, backup) == 0) break; VIM_CLEAR(backup); // don't do the rename below } } if (backup == NULL && !forceit) { errmsg = (char_u *)_(e_cant_make_backup_file_add_bang_to_write_anyway); goto fail; } } } #if defined(UNIX) // When using ":w!" and the file was read-only: make it writable if (forceit && perm >= 0 && !(perm & 0200) && st_old.st_uid == getuid() && vim_strchr(p_cpo, CPO_FWRITE) == NULL) { perm |= 0200; (void)mch_setperm(fname, perm); made_writable = TRUE; } #endif // When using ":w!" and writing to the current file, 'readonly' makes no // sense, reset it, unless 'Z' appears in 'cpoptions'. if (forceit && overwriting && vim_strchr(p_cpo, CPO_KEEPRO) == NULL) { buf->b_p_ro = FALSE; need_maketitle = TRUE; // set window title later status_redraw_all(); // redraw status lines later } if (end > buf->b_ml.ml_line_count) end = buf->b_ml.ml_line_count; if (buf->b_ml.ml_flags & ML_EMPTY) start = end + 1; // If the original file is being overwritten, there is a small chance that // we crash in the middle of writing. Therefore the file is preserved now. // This makes all block numbers positive so that recovery does not need // the original file. // Don't do this if there is a backup file and we are exiting. if (reset_changed && !newfile && overwriting && !(exiting && backup != NULL)) { ml_preserve(buf, FALSE); if (got_int) { errmsg = (char_u *)_(e_interrupted); goto restore_backup; } } #ifdef VMS vms_remove_version(fname); // remove version #endif // Default: write the file directly. May write to a temp file for // multi-byte conversion. wfname = fname; // Check for forced 'fileencoding' from "++opt=val" argument. if (eap != NULL && eap->force_enc != 0) { fenc = eap->cmd + eap->force_enc; fenc = enc_canonize(fenc); fenc_tofree = fenc; } else fenc = buf->b_p_fenc; // Check if the file needs to be converted. converted = need_conversion(fenc); // Check if UTF-8 to UCS-2/4 or Latin1 conversion needs to be done. Or // Latin1 to Unicode conversion. This is handled in buf_write_bytes(). // Prepare the flags for it and allocate bw_conv_buf when needed. if (converted && (enc_utf8 || STRCMP(p_enc, "latin1") == 0)) { wb_flags = get_fio_flags(fenc); if (wb_flags & (FIO_UCS2 | FIO_UCS4 | FIO_UTF16 | FIO_UTF8)) { // Need to allocate a buffer to translate into. if (wb_flags & (FIO_UCS2 | FIO_UTF16 | FIO_UTF8)) write_info.bw_conv_buflen = bufsize * 2; else // FIO_UCS4 write_info.bw_conv_buflen = bufsize * 4; write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen); if (write_info.bw_conv_buf == NULL) end = 0; } } #ifdef MSWIN if (converted && wb_flags == 0 && (wb_flags = get_win_fio_flags(fenc)) != 0) { // Convert UTF-8 -> UCS-2 and UCS-2 -> DBCS. Worst-case * 4: write_info.bw_conv_buflen = bufsize * 4; write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen); if (write_info.bw_conv_buf == NULL) end = 0; } #endif #ifdef MACOS_CONVERT if (converted && wb_flags == 0 && (wb_flags = get_mac_fio_flags(fenc)) != 0) { write_info.bw_conv_buflen = bufsize * 3; write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen); if (write_info.bw_conv_buf == NULL) end = 0; } #endif #if defined(FEAT_EVAL) || defined(USE_ICONV) if (converted && wb_flags == 0) { # ifdef USE_ICONV // Use iconv() conversion when conversion is needed and it's not done // internally. write_info.bw_iconv_fd = (iconv_t)my_iconv_open(fenc, enc_utf8 ? (char_u *)"utf-8" : p_enc); if (write_info.bw_iconv_fd != (iconv_t)-1) { // We're going to use iconv(), allocate a buffer to convert in. write_info.bw_conv_buflen = bufsize * ICONV_MULT; write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen); if (write_info.bw_conv_buf == NULL) end = 0; write_info.bw_first = TRUE; } # ifdef FEAT_EVAL else # endif # endif # ifdef FEAT_EVAL // When the file needs to be converted with 'charconvert' after // writing, write to a temp file instead and let the conversion // overwrite the original file. if (*p_ccv != NUL) { wfname = vim_tempname('w', FALSE); if (wfname == NULL) // Can't write without a tempfile! { errmsg = (char_u *)_(e_cant_find_temp_file_for_writing); goto restore_backup; } } # endif } #endif if (converted && wb_flags == 0 #ifdef USE_ICONV && write_info.bw_iconv_fd == (iconv_t)-1 # endif # ifdef FEAT_EVAL && wfname == fname # endif ) { if (!forceit) { errmsg = (char_u *)_(e_cannot_convert_add_bang_to_write_without_conversion); goto restore_backup; } notconverted = TRUE; } // If conversion is taking place, we may first pretend to write and check // for conversion errors. Then loop again to write for real. // When not doing conversion this writes for real right away. for (checking_conversion = TRUE; ; checking_conversion = FALSE) { // There is no need to check conversion when: // - there is no conversion // - we make a backup file, that can be restored in case of conversion // failure. if (!converted || dobackup) checking_conversion = FALSE; if (checking_conversion) { // Make sure we don't write anything. fd = -1; write_info.bw_fd = fd; } else { #ifdef HAVE_FTRUNCATE # define TRUNC_ON_OPEN 0 #else # define TRUNC_ON_OPEN O_TRUNC #endif // Open the file "wfname" for writing. // We may try to open the file twice: If we can't write to the file // and forceit is TRUE we delete the existing file and try to // create a new one. If this still fails we may have lost the // original file! (this may happen when the user reached his // quotum for number of files). // Appending will fail if the file does not exist and forceit is // FALSE. while ((fd = mch_open((char *)wfname, O_WRONLY | O_EXTRA | (append ? (forceit ? (O_APPEND | O_CREAT) : O_APPEND) : (O_CREAT | TRUNC_ON_OPEN)) , perm < 0 ? 0666 : (perm & 0777))) < 0) { // A forced write will try to create a new file if the old one // is still readonly. This may also happen when the directory // is read-only. In that case the mch_remove() will fail. if (errmsg == NULL) { #ifdef UNIX stat_T st; // Don't delete the file when it's a hard or symbolic link. if ((!newfile && st_old.st_nlink > 1) || (mch_lstat((char *)fname, &st) == 0 && (st.st_dev != st_old.st_dev || st.st_ino != st_old.st_ino))) errmsg = (char_u *)_(e_cant_open_linked_file_for_writing); else #endif { errmsg = (char_u *)_(e_cant_open_file_for_writing); if (forceit && vim_strchr(p_cpo, CPO_FWRITE) == NULL && perm >= 0) { #ifdef UNIX // we write to the file, thus it should be marked // writable after all if (!(perm & 0200)) made_writable = TRUE; perm |= 0200; if (st_old.st_uid != getuid() || st_old.st_gid != getgid()) perm &= 0777; #endif if (!append) // don't remove when appending mch_remove(wfname); continue; } } } restore_backup: { stat_T st; // If we failed to open the file, we don't need a backup. // Throw it away. If we moved or removed the original file // try to put the backup in its place. if (backup != NULL && wfname == fname) { if (backup_copy) { // There is a small chance that we removed the // original, try to move the copy in its place. // This may not work if the vim_rename() fails. // In that case we leave the copy around. // If file does not exist, put the copy in its // place if (mch_stat((char *)fname, &st) < 0) vim_rename(backup, fname); // if original file does exist throw away the copy if (mch_stat((char *)fname, &st) >= 0) mch_remove(backup); } else { // try to put the original file back vim_rename(backup, fname); } } // if original file no longer exists give an extra warning if (!newfile && mch_stat((char *)fname, &st) < 0) end = 0; } if (wfname != fname) vim_free(wfname); goto fail; } write_info.bw_fd = fd; #if defined(UNIX) { stat_T st; // Double check we are writing the intended file before making // any changes. if (overwriting && (!dobackup || backup_copy) && fname == wfname && perm >= 0 && mch_fstat(fd, &st) == 0 && st.st_ino != st_old.st_ino) { close(fd); errmsg = (char_u *)_(e_file_changed_while_writing); goto fail; } } #endif #ifdef HAVE_FTRUNCATE if (!append) vim_ignored = ftruncate(fd, (off_t)0); #endif #if defined(MSWIN) if (backup != NULL && overwriting && !append) (void)mch_copy_file_attribute(backup, wfname); if (!overwriting && !append) { if (buf->b_ffname != NULL) (void)mch_copy_file_attribute(buf->b_ffname, wfname); // Should copy resource fork } #endif #ifdef FEAT_CRYPT if (*buf->b_p_key != NUL && !filtering) { char_u *header; int header_len; buf->b_cryptstate = crypt_create_for_writing( crypt_get_method_nr(buf), buf->b_p_key, &header, &header_len); if (buf->b_cryptstate == NULL || header == NULL) end = 0; else { // Write magic number, so that Vim knows how this file is // encrypted when reading it back. write_info.bw_buf = header; write_info.bw_len = header_len; write_info.bw_flags = FIO_NOCONVERT; if (buf_write_bytes(&write_info) == FAIL) end = 0; wb_flags |= FIO_ENCRYPTED; vim_free(header); } } #endif } errmsg = NULL; write_info.bw_buf = buffer; nchars = 0; // use "++bin", "++nobin" or 'binary' if (eap != NULL && eap->force_bin != 0) write_bin = (eap->force_bin == FORCE_BIN); else write_bin = buf->b_p_bin; // The BOM is written just after the encryption magic number. // Skip it when appending and the file already existed, the BOM only // makes sense at the start of the file. if (buf->b_p_bomb && !write_bin && (!append || perm < 0)) { write_info.bw_len = make_bom(buffer, fenc); if (write_info.bw_len > 0) { // don't convert, do encryption write_info.bw_flags = FIO_NOCONVERT | wb_flags; if (buf_write_bytes(&write_info) == FAIL) end = 0; else nchars += write_info.bw_len; } } write_info.bw_start_lnum = start; #ifdef FEAT_PERSISTENT_UNDO write_undo_file = (buf->b_p_udf && overwriting && !append && !filtering # ifdef CRYPT_NOT_INPLACE // writing undo file requires // crypt_encode_inplace() && (buf->b_cryptstate == NULL || crypt_works_inplace(buf->b_cryptstate)) # endif && reset_changed && !checking_conversion); # ifdef CRYPT_NOT_INPLACE // remove undo file if encrypting it is not possible if (buf->b_p_udf && overwriting && !append && !filtering && !checking_conversion && buf->b_cryptstate != NULL && !crypt_works_inplace(buf->b_cryptstate)) u_undofile_reset_and_delete(buf); # endif if (write_undo_file) // Prepare for computing the hash value of the text. sha256_start(&sha_ctx); #endif write_info.bw_len = bufsize; write_info.bw_flags = wb_flags; fileformat = get_fileformat_force(buf, eap); s = buffer; len = 0; for (lnum = start; lnum <= end; ++lnum) { // The next while loop is done once for each character written. // Keep it fast! ptr = ml_get_buf(buf, lnum, FALSE) - 1; #ifdef FEAT_PERSISTENT_UNDO if (write_undo_file) sha256_update(&sha_ctx, ptr + 1, (UINT32_T)(STRLEN(ptr + 1) + 1)); #endif while ((c = *++ptr) != NUL) { if (c == NL) *s = NUL; // replace newlines with NULs else if (c == CAR && fileformat == EOL_MAC) *s = NL; // Mac: replace CRs with NLs else *s = c; ++s; if (++len != bufsize) continue; #ifdef FEAT_CRYPT if (write_info.bw_fd > 0 && lnum == end && (write_info.bw_flags & FIO_ENCRYPTED) && *buf->b_p_key != NUL && !filtering && *ptr == NUL) write_info.bw_finish = TRUE; #endif if (buf_write_bytes(&write_info) == FAIL) { end = 0; // write error: break loop break; } nchars += bufsize; s = buffer; len = 0; write_info.bw_start_lnum = lnum; } // write failed or last line has no EOL: stop here if (end == 0 || (lnum == end && (write_bin || !buf->b_p_fixeol) && ((write_bin && lnum == buf->b_no_eol_lnum) || (lnum == buf->b_ml.ml_line_count && !buf->b_p_eol)))) { ++lnum; // written the line, count it no_eol = TRUE; break; } if (fileformat == EOL_UNIX) *s++ = NL; else { *s++ = CAR; // EOL_MAC or EOL_DOS: write CR if (fileformat == EOL_DOS) // write CR-NL { if (++len == bufsize) { if (buf_write_bytes(&write_info) == FAIL) { end = 0; // write error: break loop break; } nchars += bufsize; s = buffer; len = 0; } *s++ = NL; } } if (++len == bufsize && end) { if (buf_write_bytes(&write_info) == FAIL) { end = 0; // write error: break loop break; } nchars += bufsize; s = buffer; len = 0; ui_breakcheck(); if (got_int) { end = 0; // Interrupted, break loop break; } } #ifdef VMS // On VMS there is a problem: newlines get added when writing // blocks at a time. Fix it by writing a line at a time. // This is much slower! // Explanation: VAX/DECC RTL insists that records in some RMS // structures end with a newline (carriage return) character, and // if they don't it adds one. // With other RMS structures it works perfect without this fix. # ifndef MIN // Older DECC compiler for VAX doesn't define MIN() # define MIN(a, b) ((a) < (b) ? (a) : (b)) # endif if (buf->b_fab_rfm == FAB$C_VFC || ((buf->b_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0)) { int b2write; buf->b_fab_mrs = (buf->b_fab_mrs == 0 ? MIN(4096, bufsize) : MIN(buf->b_fab_mrs, bufsize)); b2write = len; while (b2write > 0) { write_info.bw_len = MIN(b2write, buf->b_fab_mrs); if (buf_write_bytes(&write_info) == FAIL) { end = 0; break; } b2write -= MIN(b2write, buf->b_fab_mrs); } write_info.bw_len = bufsize; nchars += len; s = buffer; len = 0; } #endif } if (len > 0 && end > 0) { write_info.bw_len = len; #ifdef FEAT_CRYPT if (write_info.bw_fd > 0 && lnum >= end && (write_info.bw_flags & FIO_ENCRYPTED) && *buf->b_p_key != NUL && !filtering) write_info.bw_finish = TRUE; #endif if (buf_write_bytes(&write_info) == FAIL) end = 0; // write error nchars += len; } if (!buf->b_p_fixeol && buf->b_p_eof) { // write trailing CTRL-Z (void)write_eintr(write_info.bw_fd, "\x1a", 1); nchars++; } // Stop when writing done or an error was encountered. if (!checking_conversion || end == 0) break; // If no error happened until now, writing should be ok, so loop to // really write the buffer. } // If we started writing, finish writing. Also when an error was // encountered. if (!checking_conversion) { #if defined(UNIX) && defined(HAVE_FSYNC) // On many journaling file systems there is a bug that causes both the // original and the backup file to be lost when halting the system // right after writing the file. That's because only the meta-data is // journalled. Syncing the file slows down the system, but assures it // has been written to disk and we don't lose it. // For a device do try the fsync() but don't complain if it does not // work (could be a pipe). // If the 'fsync' option is FALSE, don't fsync(). Useful for laptops. if (p_fs && vim_fsync(fd) != 0 && !device) { errmsg = (char_u *)_(e_fsync_failed); end = 0; } #endif #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) || defined(FEAT_XATTR) // Probably need to set the security context. if (!backup_copy) { #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) mch_copy_sec(backup, wfname); #endif #ifdef FEAT_XATTR mch_copy_xattr(backup, wfname); #endif } #endif #ifdef UNIX // When creating a new file, set its owner/group to that of the // original file. Get the new device and inode number. if (backup != NULL && !backup_copy) { # ifdef HAVE_FCHOWN stat_T st; // Don't change the owner when it's already OK, some systems remove // permission or ACL stuff. if (mch_stat((char *)wfname, &st) < 0 || st.st_uid != st_old.st_uid || st.st_gid != st_old.st_gid) { // changing owner might not be possible vim_ignored = fchown(fd, st_old.st_uid, -1); // if changing group fails clear the group permissions if (fchown(fd, -1, st_old.st_gid) == -1 && perm > 0) perm &= ~070; } # endif buf_setino(buf); } else if (!buf->b_dev_valid) // Set the inode when creating a new file. buf_setino(buf); #endif #ifdef UNIX if (made_writable) perm &= ~0200; // reset 'w' bit for security reasons #endif #ifdef HAVE_FCHMOD // set permission of new file same as old file if (perm >= 0) (void)mch_fsetperm(fd, perm); #endif if (close(fd) != 0) { errmsg = (char_u *)_(e_close_failed); end = 0; } #ifndef HAVE_FCHMOD // set permission of new file same as old file if (perm >= 0) (void)mch_setperm(wfname, perm); #endif #ifdef HAVE_ACL // Probably need to set the ACL before changing the user (can't set the // ACL on a file the user doesn't own). // On Solaris, with ZFS and the aclmode property set to "discard" (the // default), chmod() discards all part of a file's ACL that don't // represent the mode of the file. It's non-trivial for us to discover // whether we're in that situation, so we simply always re-set the ACL. # ifndef HAVE_SOLARIS_ZFS_ACL if (!backup_copy) # endif mch_set_acl(wfname, acl); #endif #ifdef FEAT_CRYPT if (buf->b_cryptstate != NULL) { crypt_free_state(buf->b_cryptstate); buf->b_cryptstate = NULL; } #endif #if defined(FEAT_EVAL) if (wfname != fname) { // The file was written to a temp file, now it needs to be // converted with 'charconvert' to (overwrite) the output file. if (end != 0) { if (eval_charconvert(enc_utf8 ? (char_u *)"utf-8" : p_enc, fenc, wfname, fname) == FAIL) { write_info.bw_conv_error = TRUE; end = 0; } } mch_remove(wfname); vim_free(wfname); } #endif } if (end == 0) { // Error encountered. if (errmsg == NULL) { if (write_info.bw_conv_error) { if (write_info.bw_conv_error_lnum == 0) errmsg = (char_u *)_(e_write_error_conversion_failed_make_fenc_empty_to_override); else { errmsg_allocated = TRUE; errmsg = alloc(300); vim_snprintf((char *)errmsg, 300, _(e_write_error_conversion_failed_in_line_nr_make_fenc_empty_to_override), (long)write_info.bw_conv_error_lnum); } } else if (got_int) errmsg = (char_u *)_(e_interrupted); else errmsg = (char_u *)_(e_write_error_file_system_full); } // If we have a backup file, try to put it in place of the new file, // because the new file is probably corrupt. This avoids losing the // original file when trying to make a backup when writing the file a // second time. // When "backup_copy" is set we need to copy the backup over the new // file. Otherwise rename the backup file. // If this is OK, don't give the extra warning message. if (backup != NULL) { if (backup_copy) { // This may take a while, if we were interrupted let the user // know we got the message. if (got_int) { msg(_(e_interrupted)); out_flush(); } if ((fd = mch_open((char *)backup, O_RDONLY | O_EXTRA, 0)) >= 0) { if ((write_info.bw_fd = mch_open((char *)fname, O_WRONLY | O_CREAT | O_TRUNC | O_EXTRA, perm & 0777)) >= 0) { // copy the file. write_info.bw_buf = smallbuf; write_info.bw_flags = FIO_NOCONVERT; while ((write_info.bw_len = read_eintr(fd, smallbuf, SMALLBUFSIZE)) > 0) if (buf_write_bytes(&write_info) == FAIL) break; if (close(write_info.bw_fd) >= 0 && write_info.bw_len == 0) end = 1; // success } close(fd); // ignore errors for closing read file } } else { if (vim_rename(backup, fname) == 0) end = 1; } } goto fail; } lnum -= start; // compute number of written lines --no_wait_return; // may wait for return now #if !(defined(UNIX) || defined(VMS)) fname = sfname; // use shortname now, for the messages #endif if (!filtering) { msg_add_fname(buf, fname); // put fname in IObuff with quotes c = FALSE; if (write_info.bw_conv_error) { STRCAT(IObuff, _(" CONVERSION ERROR")); c = TRUE; if (write_info.bw_conv_error_lnum != 0) vim_snprintf_add((char *)IObuff, IOSIZE, _(" in line %ld;"), (long)write_info.bw_conv_error_lnum); } else if (notconverted) { STRCAT(IObuff, _("[NOT converted]")); c = TRUE; } else if (converted) { STRCAT(IObuff, _("[converted]")); c = TRUE; } if (device) { STRCAT(IObuff, _("[Device]")); c = TRUE; } else if (newfile) { STRCAT(IObuff, new_file_message()); c = TRUE; } if (no_eol) { msg_add_eol(); c = TRUE; } // may add [unix/dos/mac] if (msg_add_fileformat(fileformat)) c = TRUE; #ifdef FEAT_CRYPT if (wb_flags & FIO_ENCRYPTED) { crypt_append_msg(buf); c = TRUE; } #endif msg_add_lines(c, (long)lnum, nchars); // add line/char count if (!shortmess(SHM_WRITE)) { if (append) STRCAT(IObuff, shortmess(SHM_WRI) ? _(" [a]") : _(" appended")); else STRCAT(IObuff, shortmess(SHM_WRI) ? _(" [w]") : _(" written")); } set_keep_msg((char_u *)msg_trunc_attr((char *)IObuff, FALSE, 0), 0); } // When written everything correctly: reset 'modified'. Unless not // writing to the original file and '+' is not in 'cpoptions'. if (reset_changed && whole && !append && !write_info.bw_conv_error && (overwriting || vim_strchr(p_cpo, CPO_PLUS) != NULL)) { unchanged(buf, TRUE, FALSE); // b:changedtick may be incremented in unchanged() but that should not // trigger a TextChanged event. if (buf->b_last_changedtick + 1 == CHANGEDTICK(buf)) buf->b_last_changedtick = CHANGEDTICK(buf); u_unchanged(buf); u_update_save_nr(buf); } // If written to the current file, update the timestamp of the swap file // and reset the BF_WRITE_MASK flags. Also sets buf->b_mtime. if (overwriting) { ml_timestamp(buf); if (append) buf->b_flags &= ~BF_NEW; else buf->b_flags &= ~BF_WRITE_MASK; } // If we kept a backup until now, and we are in patch mode, then we make // the backup file our 'original' file. if (*p_pm && dobackup) { char *org = (char *)buf_modname((buf->b_p_sn || buf->b_shortname), fname, p_pm, FALSE); if (backup != NULL) { stat_T st; // If the original file does not exist yet // the current backup file becomes the original file if (org == NULL) emsg(_(e_patchmode_cant_save_original_file)); else if (mch_stat(org, &st) < 0) { vim_rename(backup, (char_u *)org); VIM_CLEAR(backup); // don't delete the file #ifdef UNIX set_file_time((char_u *)org, st_old.st_atime, st_old.st_mtime); #endif } } // If there is no backup file, remember that a (new) file was // created. else { int empty_fd; if (org == NULL || (empty_fd = mch_open(org, O_CREAT | O_EXTRA | O_EXCL | O_NOFOLLOW, perm < 0 ? 0666 : (perm & 0777))) < 0) emsg(_(e_patchmode_cant_touch_empty_original_file)); else close(empty_fd); } if (org != NULL) { mch_setperm((char_u *)org, mch_getperm(fname) & 0777); vim_free(org); } } // Remove the backup unless 'backup' option is set or there was a // conversion error. if (!p_bk && backup != NULL && !write_info.bw_conv_error && mch_remove(backup) != 0) emsg(_(e_cant_delete_backup_file)); goto nofail; // Finish up. We get here either after failure or success. fail: --no_wait_return; // may wait for return now nofail: // Done saving, we accept changed buffer warnings again buf->b_saving = FALSE; vim_free(backup); if (buffer != smallbuf) vim_free(buffer); vim_free(fenc_tofree); vim_free(write_info.bw_conv_buf); #ifdef USE_ICONV if (write_info.bw_iconv_fd != (iconv_t)-1) { iconv_close(write_info.bw_iconv_fd); write_info.bw_iconv_fd = (iconv_t)-1; } #endif #ifdef HAVE_ACL mch_free_acl(acl); #endif if (errmsg != NULL) { int numlen = errnum != NULL ? (int)STRLEN(errnum) : 0; attr = HL_ATTR(HLF_E); // set highlight for error messages msg_add_fname(buf, #ifndef UNIX sfname #else fname #endif ); // put file name in IObuff with quotes if (STRLEN(IObuff) + STRLEN(errmsg) + numlen >= IOSIZE) IObuff[IOSIZE - STRLEN(errmsg) - numlen - 1] = NUL; // If the error message has the form "is ...", put the error number in // front of the file name. if (errnum != NULL) { STRMOVE(IObuff + numlen, IObuff); mch_memmove(IObuff, errnum, (size_t)numlen); } STRCAT(IObuff, errmsg); emsg((char *)IObuff); if (errmsg_allocated) vim_free(errmsg); retval = FAIL; if (end == 0) { msg_puts_attr(_("\nWARNING: Original file may be lost or damaged\n"), attr | MSG_HIST); msg_puts_attr(_("don't quit the editor until the file is successfully written!"), attr | MSG_HIST); // Update the timestamp to avoid an "overwrite changed file" // prompt when writing again. if (mch_stat((char *)fname, &st_old) >= 0) { buf_store_time(buf, &st_old, fname); buf->b_mtime_read = buf->b_mtime; buf->b_mtime_read_ns = buf->b_mtime_ns; } } } msg_scroll = msg_save; #ifdef FEAT_PERSISTENT_UNDO // When writing the whole file and 'undofile' is set, also write the undo // file. if (retval == OK && write_undo_file) { char_u hash[UNDO_HASH_SIZE]; sha256_finish(&sha_ctx, hash); u_write_undo(NULL, FALSE, buf, hash); } #endif #ifdef FEAT_EVAL if (!should_abort(retval)) #else if (!got_int) #endif { aco_save_T aco; curbuf->b_no_eol_lnum = 0; // in case it was set by the previous read // Apply POST autocommands. // Careful: The autocommands may call buf_write() recursively! // Only do this when a window was found for "buf". aucmd_prepbuf(&aco, buf); if (curbuf == buf) { if (append) apply_autocmds_exarg(EVENT_FILEAPPENDPOST, fname, fname, FALSE, curbuf, eap); else if (filtering) apply_autocmds_exarg(EVENT_FILTERWRITEPOST, NULL, fname, FALSE, curbuf, eap); else if (reset_changed && whole) apply_autocmds_exarg(EVENT_BUFWRITEPOST, fname, fname, FALSE, curbuf, eap); else apply_autocmds_exarg(EVENT_FILEWRITEPOST, fname, fname, FALSE, curbuf, eap); // restore curwin/curbuf and a few other things aucmd_restbuf(&aco); } #ifdef FEAT_EVAL if (aborting()) // autocmds may abort script processing retval = FALSE; #endif } #ifdef FEAT_VIMINFO // Make sure marks will be written out to the viminfo file later, even when // the file is new. curbuf->b_marks_read = TRUE; #endif got_int |= prev_got_int; return retval; }