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fileio.c
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fileio.c
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/* 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.
*/
/*
* fileio.c: read from and write to a file
*/
#include "vim.h"
#if defined(__TANDEM)
# include <limits.h> // for SSIZE_MAX
#endif
#if (defined(UNIX) || defined(VMS)) && defined(FEAT_EVAL)
# include <pwd.h>
# include <grp.h>
#endif
#if defined(VMS) && defined(HAVE_XOS_R_H)
# include <x11/xos_r.h>
#endif
// Is there any system that doesn't have access()?
#define USE_MCH_ACCESS
#if defined(__hpux) && !defined(HAVE_DIRFD)
# define dirfd(x) ((x)->__dd_fd)
# define HAVE_DIRFD
#endif
static char_u *next_fenc(char_u **pp, int *alloced);
#ifdef FEAT_EVAL
static char_u *readfile_charconvert(char_u *fname, char_u *fenc, int *fdp);
#endif
#ifdef FEAT_CRYPT
static char_u *check_for_cryptkey(char_u *cryptkey, char_u *ptr, long *sizep, off_T *filesizep, int newfile, char_u *fname, int *did_ask);
#endif
static linenr_T readfile_linenr(linenr_T linecnt, char_u *p, char_u *endp);
static char_u *check_for_bom(char_u *p, long size, int *lenp, int flags);
#ifdef FEAT_EVAL
static int readdirex_sort;
#endif
void
filemess(
buf_T *buf,
char_u *name,
char_u *s,
int attr)
{
int msg_scroll_save;
int prev_msg_col = msg_col;
if (msg_silent != 0)
return;
msg_add_fname(buf, name); // put file name in IObuff with quotes
// If it's extremely long, truncate it.
if (STRLEN(IObuff) > IOSIZE - 100)
IObuff[IOSIZE - 100] = NUL;
// Avoid an over-long translation to cause trouble.
STRNCAT(IObuff, s, 99);
/*
* For the first message may have to start a new line.
* For further ones overwrite the previous one, reset msg_scroll before
* calling filemess().
*/
msg_scroll_save = msg_scroll;
if (shortmess(SHM_OVERALL) && !exiting && p_verbose == 0)
msg_scroll = FALSE;
if (!msg_scroll) // wait a bit when overwriting an error msg
check_for_delay(FALSE);
msg_start();
if (prev_msg_col != 0 && msg_col == 0)
msg_putchar('\r'); // overwrite any previous message.
msg_scroll = msg_scroll_save;
msg_scrolled_ign = TRUE;
// may truncate the message to avoid a hit-return prompt
msg_outtrans_attr(msg_may_trunc(FALSE, IObuff), attr);
msg_clr_eos();
out_flush();
msg_scrolled_ign = FALSE;
}
/*
* Read lines from file "fname" into the buffer after line "from".
*
* 1. We allocate blocks with lalloc, as big as possible.
* 2. Each block is filled with characters from the file with a single read().
* 3. The lines are inserted in the buffer with ml_append().
*
* (caller must check that fname != NULL, unless READ_STDIN is used)
*
* "lines_to_skip" is the number of lines that must be skipped
* "lines_to_read" is the number of lines that are appended
* When not recovering lines_to_skip is 0 and lines_to_read MAXLNUM.
*
* flags:
* READ_NEW starting to edit a new buffer
* READ_FILTER reading filter output
* READ_STDIN read from stdin instead of a file
* READ_BUFFER read from curbuf instead of a file (converting after reading
* stdin)
* READ_NOFILE do not read a file, only trigger BufReadCmd
* READ_DUMMY read into a dummy buffer (to check if file contents changed)
* READ_KEEP_UNDO don't clear undo info or read it from a file
* READ_FIFO read from fifo/socket instead of a file
*
* return FAIL for failure, NOTDONE for directory (failure), or OK
*/
int
readfile(
char_u *fname,
char_u *sfname,
linenr_T from,
linenr_T lines_to_skip,
linenr_T lines_to_read,
exarg_T *eap, // can be NULL!
int flags)
{
int fd = 0;
int newfile = (flags & READ_NEW);
int check_readonly;
int filtering = (flags & READ_FILTER);
int read_stdin = (flags & READ_STDIN);
int read_buffer = (flags & READ_BUFFER);
int read_fifo = (flags & READ_FIFO);
int set_options = newfile || read_buffer
|| (eap != NULL && eap->read_edit);
linenr_T read_buf_lnum = 1; // next line to read from curbuf
colnr_T read_buf_col = 0; // next char to read from this line
char_u c;
linenr_T lnum = from;
char_u *ptr = NULL; // pointer into read buffer
char_u *buffer = NULL; // read buffer
char_u *new_buffer = NULL; // init to shut up gcc
char_u *line_start = NULL; // init to shut up gcc
int wasempty; // buffer was empty before reading
colnr_T len;
long size = 0;
char_u *p;
off_T filesize = 0;
int skip_read = FALSE;
off_T filesize_disk = 0; // file size read from disk
off_T filesize_count = 0; // counter
#ifdef FEAT_CRYPT
char_u *cryptkey = NULL;
int did_ask_for_key = FALSE;
#endif
#ifdef FEAT_PERSISTENT_UNDO
context_sha256_T sha_ctx;
int read_undo_file = FALSE;
#endif
int split = 0; // number of split lines
#define UNKNOWN 0x0fffffff // file size is unknown
linenr_T linecnt;
int error = FALSE; // errors encountered
int ff_error = EOL_UNKNOWN; // file format with errors
long linerest = 0; // remaining chars in line
#ifdef UNIX
int perm = 0;
int swap_mode = -1; // protection bits for swap file
#else
int perm;
#endif
int fileformat = 0; // end-of-line format
int keep_fileformat = FALSE;
stat_T st;
int file_readonly;
linenr_T skip_count = 0;
linenr_T read_count = 0;
int msg_save = msg_scroll;
linenr_T read_no_eol_lnum = 0; // non-zero lnum when last line of
// last read was missing the eol
int try_mac;
int try_dos;
int try_unix;
int file_rewind = FALSE;
int can_retry;
linenr_T conv_error = 0; // line nr with conversion error
linenr_T illegal_byte = 0; // line nr with illegal byte
int keep_dest_enc = FALSE; // don't retry when char doesn't fit
// in destination encoding
int bad_char_behavior = BAD_REPLACE;
// BAD_KEEP, BAD_DROP or character to
// replace with
char_u *tmpname = NULL; // name of 'charconvert' output file
int fio_flags = 0;
char_u *fenc; // fileencoding to use
int fenc_alloced; // fenc_next is in allocated memory
char_u *fenc_next = NULL; // next item in 'fencs' or NULL
int advance_fenc = FALSE;
long real_size = 0;
#ifdef USE_ICONV
iconv_t iconv_fd = (iconv_t)-1; // descriptor for iconv() or -1
# ifdef FEAT_EVAL
int did_iconv = FALSE; // TRUE when iconv() failed and trying
// 'charconvert' next
# endif
#endif
int converted = FALSE; // TRUE if conversion done
int notconverted = FALSE; // TRUE if conversion wanted but it
// wasn't possible
char_u conv_rest[CONV_RESTLEN];
int conv_restlen = 0; // nr of bytes in conv_rest[]
pos_T orig_start;
buf_T *old_curbuf;
char_u *old_b_ffname;
char_u *old_b_fname;
int using_b_ffname;
int using_b_fname;
static char *msg_is_a_directory = N_("is a directory");
int eof;
au_did_filetype = FALSE; // reset before triggering any autocommands
curbuf->b_no_eol_lnum = 0; // in case it was set by the previous read
/*
* If there is no file name yet, use the one for the read file.
* BF_NOTEDITED is set to reflect this.
* Don't do this for a read from a filter.
* Only do this when 'cpoptions' contains the 'f' flag.
*/
if (curbuf->b_ffname == NULL
&& !filtering
&& fname != NULL
&& vim_strchr(p_cpo, CPO_FNAMER) != NULL
&& !(flags & READ_DUMMY))
{
if (set_rw_fname(fname, sfname) == FAIL)
return FAIL;
}
// Remember the initial values of curbuf, curbuf->b_ffname and
// curbuf->b_fname to detect whether they are altered as a result of
// executing nasty autocommands. Also check if "fname" and "sfname"
// point to one of these values.
old_curbuf = curbuf;
old_b_ffname = curbuf->b_ffname;
old_b_fname = curbuf->b_fname;
using_b_ffname = (fname == curbuf->b_ffname)
|| (sfname == curbuf->b_ffname);
using_b_fname = (fname == curbuf->b_fname) || (sfname == curbuf->b_fname);
// After reading a file the cursor line changes but we don't want to
// display the line.
ex_no_reprint = TRUE;
// don't display the file info for another buffer now
need_fileinfo = FALSE;
/*
* 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.
*/
if (sfname == NULL)
sfname = fname;
#if defined(UNIX)
fname = sfname;
#endif
/*
* The BufReadCmd and FileReadCmd events intercept the reading process by
* executing the associated commands instead.
*/
if (!filtering && !read_stdin && !read_buffer)
{
orig_start = curbuf->b_op_start;
// Set '[ mark to the line above where the lines go (line 1 if zero).
curbuf->b_op_start.lnum = ((from == 0) ? 1 : from);
curbuf->b_op_start.col = 0;
if (newfile)
{
if (apply_autocmds_exarg(EVENT_BUFREADCMD, NULL, sfname,
FALSE, curbuf, eap))
{
int status = OK;
#ifdef FEAT_EVAL
if (aborting())
status = FAIL;
#endif
// The BufReadCmd code usually uses ":read" to get the text and
// perhaps ":file" to change the buffer name. But we should
// consider this to work like ":edit", thus reset the
// BF_NOTEDITED flag. Then ":write" will work to overwrite the
// same file.
if (status == OK)
curbuf->b_flags &= ~BF_NOTEDITED;
return status;
}
}
else if (apply_autocmds_exarg(EVENT_FILEREADCMD, sfname, sfname,
FALSE, NULL, eap))
#ifdef FEAT_EVAL
return aborting() ? FAIL : OK;
#else
return OK;
#endif
curbuf->b_op_start = orig_start;
if (flags & READ_NOFILE)
// Return NOTDONE instead of FAIL so that BufEnter can be triggered
// and other operations don't fail.
return NOTDONE;
}
if ((shortmess(SHM_OVER) || curbuf->b_help) && p_verbose == 0)
msg_scroll = FALSE; // overwrite previous file message
else
msg_scroll = TRUE; // don't overwrite previous file message
if (fname != NULL && *fname != NUL)
{
size_t namelen = STRLEN(fname);
// If the name is too long we might crash further on, quit here.
if (namelen >= MAXPATHL)
{
filemess(curbuf, fname, (char_u *)_("Illegal file name"), 0);
msg_end();
msg_scroll = msg_save;
return FAIL;
}
// If the name ends in a path separator, we can't open it. Check here,
// because reading the file may actually work, but then creating the
// swap file may destroy it! Reported on MS-DOS and Win 95.
if (after_pathsep(fname, fname + namelen))
{
filemess(curbuf, fname, (char_u *)_(msg_is_a_directory), 0);
msg_end();
msg_scroll = msg_save;
return NOTDONE;
}
}
if (!read_stdin && !read_buffer && !read_fifo)
{
#if defined(UNIX) || defined(VMS)
/*
* On Unix it is possible to read a directory, so we have to
* check for it before the mch_open().
*/
perm = mch_getperm(fname);
if (perm >= 0 && !S_ISREG(perm) // not a regular file ...
&& !S_ISFIFO(perm) // ... or fifo
&& !S_ISSOCK(perm) // ... or socket
# ifdef OPEN_CHR_FILES
&& !(S_ISCHR(perm) && is_dev_fd_file(fname))
// ... or a character special file named /dev/fd/<n>
# endif
)
{
int retval = FAIL;
if (S_ISDIR(perm))
{
filemess(curbuf, fname, (char_u *)_(msg_is_a_directory), 0);
retval = NOTDONE;
}
else
filemess(curbuf, fname, (char_u *)_("is not a file"), 0);
msg_end();
msg_scroll = msg_save;
return retval;
}
#endif
#if defined(MSWIN)
/*
* MS-Windows allows opening a device, but we will probably get stuck
* trying to read it.
*/
if (!p_odev && mch_nodetype(fname) == NODE_WRITABLE)
{
filemess(curbuf, fname, (char_u *)_("is a device (disabled with 'opendevice' option)"), 0);
msg_end();
msg_scroll = msg_save;
return FAIL;
}
#endif
}
// Set default or forced 'fileformat' and 'binary'.
set_file_options(set_options, eap);
/*
* When opening a new file we take the readonly flag from the file.
* Default is r/w, can be set to r/o below.
* Don't reset it when in readonly mode
* Only set/reset b_p_ro when BF_CHECK_RO is set.
*/
check_readonly = (newfile && (curbuf->b_flags & BF_CHECK_RO));
if (check_readonly && !readonlymode)
curbuf->b_p_ro = FALSE;
if (newfile && !read_stdin && !read_buffer && !read_fifo)
{
// Remember time of file.
if (mch_stat((char *)fname, &st) >= 0)
{
buf_store_time(curbuf, &st, fname);
curbuf->b_mtime_read = curbuf->b_mtime;
curbuf->b_mtime_read_ns = curbuf->b_mtime_ns;
filesize_disk = st.st_size;
#ifdef UNIX
/*
* Use the protection bits of the original file for the swap file.
* This makes it possible for others to read the name of the
* edited file from the swapfile, but only if they can read the
* edited file.
* Remove the "write" and "execute" bits for group and others
* (they must not write the swapfile).
* Add the "read" and "write" bits for the user, otherwise we may
* not be able to write to the file ourselves.
* Setting the bits is done below, after creating the swap file.
*/
swap_mode = (st.st_mode & 0644) | 0600;
#endif
#ifdef VMS
curbuf->b_fab_rfm = st.st_fab_rfm;
curbuf->b_fab_rat = st.st_fab_rat;
curbuf->b_fab_mrs = st.st_fab_mrs;
#endif
}
else
{
curbuf->b_mtime = 0;
curbuf->b_mtime_ns = 0;
curbuf->b_mtime_read = 0;
curbuf->b_mtime_read_ns = 0;
curbuf->b_orig_size = 0;
curbuf->b_orig_mode = 0;
}
// Reset the "new file" flag. It will be set again below when the
// file doesn't exist.
curbuf->b_flags &= ~(BF_NEW | BF_NEW_W);
}
/*
* for UNIX: check readonly with perm and mch_access()
* for Amiga: check readonly by trying to open the file for writing
*/
file_readonly = FALSE;
if (read_stdin)
{
#if defined(MSWIN)
// Force binary I/O on stdin to avoid CR-LF -> LF conversion.
setmode(0, O_BINARY);
#endif
}
else if (!read_buffer)
{
#ifdef USE_MCH_ACCESS
if (
# ifdef UNIX
!(perm & 0222) ||
# endif
mch_access((char *)fname, W_OK))
file_readonly = TRUE;
fd = mch_open((char *)fname, O_RDONLY | O_EXTRA, 0);
#else
if (!newfile
|| readonlymode
|| (fd = mch_open((char *)fname, O_RDWR | O_EXTRA, 0)) < 0)
{
file_readonly = TRUE;
// try to open ro
fd = mch_open((char *)fname, O_RDONLY | O_EXTRA, 0);
}
#endif
}
if (fd < 0) // cannot open at all
{
#ifndef UNIX
int isdir_f;
#endif
msg_scroll = msg_save;
#ifndef UNIX
/*
* On Amiga we can't open a directory, check here.
*/
isdir_f = (mch_isdir(fname));
perm = mch_getperm(fname); // check if the file exists
if (isdir_f)
{
filemess(curbuf, sfname, (char_u *)_(msg_is_a_directory), 0);
curbuf->b_p_ro = TRUE; // must use "w!" now
}
else
#endif
if (newfile)
{
if (perm < 0
#ifdef ENOENT
&& errno == ENOENT
#endif
)
{
/*
* Set the 'new-file' flag, so that when the file has
* been created by someone else, a ":w" will complain.
*/
curbuf->b_flags |= BF_NEW;
// Create a swap file now, so that other Vims are warned
// that we are editing this file. Don't do this for a
// "nofile" or "nowrite" buffer type.
if (!bt_dontwrite(curbuf))
{
check_need_swap(newfile);
// SwapExists autocommand may mess things up
if (curbuf != old_curbuf
|| (using_b_ffname
&& (old_b_ffname != curbuf->b_ffname))
|| (using_b_fname
&& (old_b_fname != curbuf->b_fname)))
{
emsg(_(e_autocommands_changed_buffer_or_buffer_name));
return FAIL;
}
}
if (dir_of_file_exists(fname))
filemess(curbuf, sfname,
(char_u *)new_file_message(), 0);
else
filemess(curbuf, sfname,
(char_u *)_("[New DIRECTORY]"), 0);
#ifdef FEAT_VIMINFO
// Even though this is a new file, it might have been
// edited before and deleted. Get the old marks.
check_marks_read();
#endif
// Set forced 'fileencoding'.
if (eap != NULL)
set_forced_fenc(eap);
apply_autocmds_exarg(EVENT_BUFNEWFILE, sfname, sfname,
FALSE, curbuf, eap);
// remember the current fileformat
save_file_ff(curbuf);
#if defined(FEAT_EVAL)
if (aborting()) // autocmds may abort script processing
return FAIL;
#endif
return OK; // a new file is not an error
}
else
{
filemess(curbuf, sfname, (char_u *)(
# ifdef EFBIG
(errno == EFBIG) ? _("[File too big]") :
# endif
# ifdef EOVERFLOW
(errno == EOVERFLOW) ? _("[File too big]") :
# endif
_("[Permission Denied]")), 0);
curbuf->b_p_ro = TRUE; // must use "w!" now
}
}
return FAIL;
}
/*
* Only set the 'ro' flag for readonly files the first time they are
* loaded. Help files always get readonly mode
*/
if ((check_readonly && file_readonly) || curbuf->b_help)
curbuf->b_p_ro = TRUE;
if (set_options)
{
// Don't change 'eol' if reading from buffer as it will already be
// correctly set when reading stdin.
if (!read_buffer)
{
curbuf->b_p_eol = TRUE;
curbuf->b_start_eol = TRUE;
}
curbuf->b_p_bomb = FALSE;
curbuf->b_start_bomb = FALSE;
}
// Create a swap file now, so that other Vims are warned that we are
// editing this file.
// Don't do this for a "nofile" or "nowrite" buffer type.
if (!bt_dontwrite(curbuf))
{
check_need_swap(newfile);
if (!read_stdin && (curbuf != old_curbuf
|| (using_b_ffname && (old_b_ffname != curbuf->b_ffname))
|| (using_b_fname && (old_b_fname != curbuf->b_fname))))
{
emsg(_(e_autocommands_changed_buffer_or_buffer_name));
if (!read_buffer)
close(fd);
return FAIL;
}
#ifdef UNIX
// Set swap file protection bits after creating it.
if (swap_mode > 0 && curbuf->b_ml.ml_mfp != NULL
&& curbuf->b_ml.ml_mfp->mf_fname != NULL)
{
char_u *swap_fname = curbuf->b_ml.ml_mfp->mf_fname;
/*
* If the group-read bit is set but not the world-read bit, then
* the group must be equal to the group of the original file. If
* we can't make that happen then reset the group-read bit. This
* avoids making the swap file readable to more users when the
* primary group of the user is too permissive.
*/
if ((swap_mode & 044) == 040)
{
stat_T swap_st;
if (mch_stat((char *)swap_fname, &swap_st) >= 0
&& st.st_gid != swap_st.st_gid
# ifdef HAVE_FCHOWN
&& fchown(curbuf->b_ml.ml_mfp->mf_fd, -1, st.st_gid)
== -1
# endif
)
swap_mode &= 0600;
}
(void)mch_setperm(swap_fname, (long)swap_mode);
}
#endif
}
// If "Quit" selected at ATTENTION dialog, don't load the file
if (swap_exists_action == SEA_QUIT)
{
if (!read_buffer && !read_stdin)
close(fd);
return FAIL;
}
++no_wait_return; // don't wait for return yet
/*
* Set '[ mark to the line above where the lines go (line 1 if zero).
*/
orig_start = curbuf->b_op_start;
curbuf->b_op_start.lnum = ((from == 0) ? 1 : from);
curbuf->b_op_start.col = 0;
try_mac = (vim_strchr(p_ffs, 'm') != NULL);
try_dos = (vim_strchr(p_ffs, 'd') != NULL);
try_unix = (vim_strchr(p_ffs, 'x') != NULL);
if (!read_buffer)
{
int m = msg_scroll;
int n = msg_scrolled;
/*
* The file must be closed again, the autocommands may want to change
* the file before reading it.
*/
if (!read_stdin)
close(fd); // ignore errors
/*
* The output from the autocommands should not overwrite anything and
* should not be overwritten: Set msg_scroll, restore its value if no
* output was done.
*/
msg_scroll = TRUE;
if (filtering)
apply_autocmds_exarg(EVENT_FILTERREADPRE, NULL, sfname,
FALSE, curbuf, eap);
else if (read_stdin)
apply_autocmds_exarg(EVENT_STDINREADPRE, NULL, sfname,
FALSE, curbuf, eap);
else if (newfile)
apply_autocmds_exarg(EVENT_BUFREADPRE, NULL, sfname,
FALSE, curbuf, eap);
else
apply_autocmds_exarg(EVENT_FILEREADPRE, sfname, sfname,
FALSE, NULL, eap);
// autocommands may have changed it
try_mac = (vim_strchr(p_ffs, 'm') != NULL);
try_dos = (vim_strchr(p_ffs, 'd') != NULL);
try_unix = (vim_strchr(p_ffs, 'x') != NULL);
curbuf->b_op_start = orig_start;
if (msg_scrolled == n)
msg_scroll = m;
#ifdef FEAT_EVAL
if (aborting()) // autocmds may abort script processing
{
--no_wait_return;
msg_scroll = msg_save;
curbuf->b_p_ro = TRUE; // must use "w!" now
return FAIL;
}
#endif
/*
* Don't allow the autocommands to change the current buffer.
* Try to re-open the file.
*
* Don't allow the autocommands to change the buffer name either
* (cd for example) if it invalidates fname or sfname.
*/
if (!read_stdin && (curbuf != old_curbuf
|| (using_b_ffname && (old_b_ffname != curbuf->b_ffname))
|| (using_b_fname && (old_b_fname != curbuf->b_fname))
|| (fd = mch_open((char *)fname, O_RDONLY | O_EXTRA, 0)) < 0))
{
--no_wait_return;
msg_scroll = msg_save;
if (fd < 0)
emsg(_(e_readpre_autocommands_made_file_unreadable));
else
emsg(_(e_readpre_autocommands_must_not_change_current_buffer));
curbuf->b_p_ro = TRUE; // must use "w!" now
return FAIL;
}
}
// Autocommands may add lines to the file, need to check if it is empty
wasempty = (curbuf->b_ml.ml_flags & ML_EMPTY);
if (!recoverymode && !filtering && !(flags & READ_DUMMY))
{
/*
* Show the user that we are busy reading the input. Sometimes this
* may take a while. When reading from stdin another program may
* still be running, don't move the cursor to the last line, unless
* always using the GUI.
*/
if (read_stdin)
{
if (!is_not_a_term())
{
#ifndef ALWAYS_USE_GUI
# ifdef VIMDLL
if (!gui.in_use)
# endif
mch_msg(_("Vim: Reading from stdin...\n"));
#endif
#ifdef FEAT_GUI
// Also write a message in the GUI window, if there is one.
if (gui.in_use && !gui.dying && !gui.starting)
{
// make a copy, gui_write() may try to change it
p = vim_strsave((char_u *)_("Reading from stdin..."));
if (p != NULL)
{
gui_write(p, (int)STRLEN(p));
vim_free(p);
}
}
#endif
}
}
else if (!read_buffer)
filemess(curbuf, sfname, (char_u *)"", 0);
}
msg_scroll = FALSE; // overwrite the file message
/*
* Set linecnt now, before the "retry" caused by a wrong guess for
* fileformat, and after the autocommands, which may change them.
*/
linecnt = curbuf->b_ml.ml_line_count;
// "++bad=" argument.
if (eap != NULL && eap->bad_char != 0)
{
bad_char_behavior = eap->bad_char;
if (set_options)
curbuf->b_bad_char = eap->bad_char;
}
else
curbuf->b_bad_char = 0;
/*
* Decide which 'encoding' to use or use first.
*/
if (eap != NULL && eap->force_enc != 0)
{
fenc = enc_canonize(eap->cmd + eap->force_enc);
fenc_alloced = TRUE;
keep_dest_enc = TRUE;
}
else if (curbuf->b_p_bin)
{
fenc = (char_u *)""; // binary: don't convert
fenc_alloced = FALSE;
}
else if (curbuf->b_help)
{
char_u firstline[80];
int fc;
// Help files are either utf-8 or latin1. Try utf-8 first, if this
// fails it must be latin1.
// Always do this when 'encoding' is "utf-8". Otherwise only do
// this when needed to avoid [converted] remarks all the time.
// It is needed when the first line contains non-ASCII characters.
// That is only in *.??x files.
fenc = (char_u *)"latin1";
c = enc_utf8;
if (!c && !read_stdin)
{
fc = fname[STRLEN(fname) - 1];
if (TOLOWER_ASC(fc) == 'x')
{
// Read the first line (and a bit more). Immediately rewind to
// the start of the file. If the read() fails "len" is -1.
len = read_eintr(fd, firstline, 80);
vim_lseek(fd, (off_T)0L, SEEK_SET);
for (p = firstline; p < firstline + len; ++p)
if (*p >= 0x80)
{
c = TRUE;
break;
}
}
}
if (c)
{
fenc_next = fenc;
fenc = (char_u *)"utf-8";
// When the file is utf-8 but a character doesn't fit in
// 'encoding' don't retry. In help text editing utf-8 bytes
// doesn't make sense.
if (!enc_utf8)
keep_dest_enc = TRUE;
}
fenc_alloced = FALSE;
}
else if (*p_fencs == NUL)
{
fenc = curbuf->b_p_fenc; // use format from buffer
fenc_alloced = FALSE;
}
else
{
fenc_next = p_fencs; // try items in 'fileencodings'
fenc = next_fenc(&fenc_next, &fenc_alloced);
}
/*
* Jump back here to retry reading the file in different ways.
* Reasons to retry:
* - encoding conversion failed: try another one from "fenc_next"
* - BOM detected and fenc was set, need to setup conversion
* - "fileformat" check failed: try another
*
* Variables set for special retry actions:
* "file_rewind" Rewind the file to start reading it again.
* "advance_fenc" Advance "fenc" using "fenc_next".
* "skip_read" Re-use already read bytes (BOM detected).
* "did_iconv" iconv() conversion failed, try 'charconvert'.
* "keep_fileformat" Don't reset "fileformat".
*
* Other status indicators:
* "tmpname" When != NULL did conversion with 'charconvert'.
* Output file has to be deleted afterwards.
* "iconv_fd" When != -1 did conversion with iconv().
*/
retry:
if (file_rewind)
{
if (read_buffer)
{
read_buf_lnum = 1;
read_buf_col = 0;
}
else if (read_stdin || vim_lseek(fd, (off_T)0L, SEEK_SET) != 0)
{
// Can't rewind the file, give up.
error = TRUE;
goto failed;
}
// Delete the previously read lines.
while (lnum > from)
ml_delete(lnum--);
file_rewind = FALSE;
if (set_options)
{
curbuf->b_p_bomb = FALSE;
curbuf->b_start_bomb = FALSE;
}
conv_error = 0;
}
/*
* When retrying with another "fenc" and the first time "fileformat"
* will be reset.
*/
if (keep_fileformat)
keep_fileformat = FALSE;
else
{
if (eap != NULL && eap->force_ff != 0)
{
fileformat = get_fileformat_force(curbuf, eap);
try_unix = try_dos = try_mac = FALSE;
}
else if (curbuf->b_p_bin)
fileformat = EOL_UNIX; // binary: use Unix format
else if (*p_ffs == NUL)
fileformat = get_fileformat(curbuf);// use format from buffer
else
fileformat = EOL_UNKNOWN; // detect from file
}
#ifdef USE_ICONV
if (iconv_fd != (iconv_t)-1)
{
// aborted conversion with iconv(), close the descriptor
iconv_close(iconv_fd);
iconv_fd = (iconv_t)-1;
}
#endif
if (advance_fenc)
{
/*
* Try the next entry in 'fileencodings'.
*/
advance_fenc = FALSE;
if (eap != NULL && eap->force_enc != 0)
{
// Conversion given with "++cc=" wasn't possible, read
// without conversion.
notconverted = TRUE;
conv_error = 0;
if (fenc_alloced)
vim_free(fenc);
fenc = (char_u *)"";
fenc_alloced = FALSE;
}
else
{
if (fenc_alloced)
vim_free(fenc);
if (fenc_next != NULL)
{
fenc = next_fenc(&fenc_next, &fenc_alloced);
}
else
{
fenc = (char_u *)"";
fenc_alloced = FALSE;
}
}
if (tmpname != NULL)
{
mch_remove(tmpname); // delete converted file
VIM_CLEAR(tmpname);
}
}
/*
* Conversion may be required when the encoding of the file is different
* from 'encoding' or 'encoding' is UTF-16, UCS-2 or UCS-4.
*/
fio_flags = 0;
converted = need_conversion(fenc);
if (converted)
{
// "ucs-bom" means we need to check the first bytes of the file
// for a BOM.
if (STRCMP(fenc, ENC_UCSBOM) == 0)
fio_flags = FIO_UCSBOM;
/*
* Check if UCS-2/4 or Latin1 to UTF-8 conversion needs to be
* done. This is handled below after read(). Prepare the
* fio_flags to avoid having to parse the string each time.
* Also check for Unicode to Latin1 conversion, because iconv()
* appears not to handle this correctly. This works just like