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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/contrib/less/edit.c |
/*
* Copyright (C) 1984-2011 Mark Nudelman
*
* You may distribute under the terms of either the GNU General Public
* License or the Less License, as specified in the README file.
*
* For more information about less, or for information on how to
* contact the author, see the README file.
*/
#include "less.h"
#if HAVE_STAT
#include <sys/stat.h>
#endif
public int fd0 = 0;
extern int new_file;
extern int errmsgs;
extern int cbufs;
extern char *every_first_cmd;
extern int any_display;
extern int force_open;
extern int is_tty;
extern int sigs;
extern IFILE curr_ifile;
extern IFILE old_ifile;
extern struct scrpos initial_scrpos;
extern void constant *ml_examine;
#if SPACES_IN_FILENAMES
extern char openquote;
extern char closequote;
#endif
#if LOGFILE
extern int logfile;
extern int force_logfile;
extern char *namelogfile;
#endif
#if HAVE_STAT_INO
public dev_t curr_dev;
public ino_t curr_ino;
#endif
char *curr_altfilename = NULL;
static void *curr_altpipe;
/*
* Textlist functions deal with a list of words separated by spaces.
* init_textlist sets up a textlist structure.
* forw_textlist uses that structure to iterate thru the list of
* words, returning each one as a standard null-terminated string.
* back_textlist does the same, but runs thru the list backwards.
*/
public void
init_textlist(tlist, str)
struct textlist *tlist;
char *str;
{
char *s;
#if SPACES_IN_FILENAMES
int meta_quoted = 0;
int delim_quoted = 0;
char *esc = get_meta_escape();
int esclen = strlen(esc);
#endif
tlist->string = skipsp(str);
tlist->endstring = tlist->string + strlen(tlist->string);
for (s = str; s < tlist->endstring; s++)
{
#if SPACES_IN_FILENAMES
if (meta_quoted)
{
meta_quoted = 0;
} else if (esclen > 0 && s + esclen < tlist->endstring &&
strncmp(s, esc, esclen) == 0)
{
meta_quoted = 1;
s += esclen - 1;
} else if (delim_quoted)
{
if (*s == closequote)
delim_quoted = 0;
} else /* (!delim_quoted) */
{
if (*s == openquote)
delim_quoted = 1;
else if (*s == ' ')
*s = '\0';
}
#else
if (*s == ' ')
*s = '\0';
#endif
}
}
public char *
forw_textlist(tlist, prev)
struct textlist *tlist;
char *prev;
{
char *s;
/*
* prev == NULL means return the first word in the list.
* Otherwise, return the word after "prev".
*/
if (prev == NULL)
s = tlist->string;
else
s = prev + strlen(prev);
if (s >= tlist->endstring)
return (NULL);
while (*s == '\0')
s++;
if (s >= tlist->endstring)
return (NULL);
return (s);
}
public char *
back_textlist(tlist, prev)
struct textlist *tlist;
char *prev;
{
char *s;
/*
* prev == NULL means return the last word in the list.
* Otherwise, return the word before "prev".
*/
if (prev == NULL)
s = tlist->endstring;
else if (prev <= tlist->string)
return (NULL);
else
s = prev - 1;
while (*s == '\0')
s--;
if (s <= tlist->string)
return (NULL);
while (s[-1] != '\0' && s > tlist->string)
s--;
return (s);
}
/*
* Close the current input file.
*/
static void
close_file()
{
struct scrpos scrpos;
if (curr_ifile == NULL_IFILE)
return;
/*
* Save the current position so that we can return to
* the same position if we edit this file again.
*/
get_scrpos(&scrpos);
if (scrpos.pos != NULL_POSITION)
{
store_pos(curr_ifile, &scrpos);
lastmark();
}
/*
* Close the file descriptor, unless it is a pipe.
*/
ch_close();
/*
* If we opened a file using an alternate name,
* do special stuff to close it.
*/
if (curr_altfilename != NULL)
{
close_altfile(curr_altfilename, get_filename(curr_ifile),
curr_altpipe);
free(curr_altfilename);
curr_altfilename = NULL;
}
curr_ifile = NULL_IFILE;
#if HAVE_STAT_INO
curr_ino = curr_dev = 0;
#endif
}
/*
* Edit a new file (given its name).
* Filename == "-" means standard input.
* Filename == NULL means just close the current file.
*/
public int
edit(filename)
char *filename;
{
if (filename == NULL)
return (edit_ifile(NULL_IFILE));
return (edit_ifile(get_ifile(filename, curr_ifile)));
}
/*
* Edit a new file (given its IFILE).
* ifile == NULL means just close the current file.
*/
public int
edit_ifile(ifile)
IFILE ifile;
{
int f;
int answer;
int no_display;
int chflags;
char *filename;
char *open_filename;
char *qopen_filename;
char *alt_filename;
void *alt_pipe;
IFILE was_curr_ifile;
PARG parg;
if (ifile == curr_ifile)
{
/*
* Already have the correct file open.
*/
return (0);
}
/*
* We must close the currently open file now.
* This is necessary to make the open_altfile/close_altfile pairs
* nest properly (or rather to avoid nesting at all).
* {{ Some stupid implementations of popen() mess up if you do:
* fA = popen("A"); fB = popen("B"); pclose(fA); pclose(fB); }}
*/
#if LOGFILE
end_logfile();
#endif
was_curr_ifile = save_curr_ifile();
if (curr_ifile != NULL_IFILE)
{
chflags = ch_getflags();
close_file();
if ((chflags & CH_HELPFILE) && held_ifile(was_curr_ifile) <= 1)
{
/*
* Don't keep the help file in the ifile list.
*/
del_ifile(was_curr_ifile);
was_curr_ifile = old_ifile;
}
}
if (ifile == NULL_IFILE)
{
/*
* No new file to open.
* (Don't set old_ifile, because if you call edit_ifile(NULL),
* you're supposed to have saved curr_ifile yourself,
* and you'll restore it if necessary.)
*/
unsave_ifile(was_curr_ifile);
return (0);
}
filename = save(get_filename(ifile));
/*
* See if LESSOPEN specifies an "alternate" file to open.
*/
alt_pipe = NULL;
alt_filename = open_altfile(filename, &f, &alt_pipe);
open_filename = (alt_filename != NULL) ? alt_filename : filename;
qopen_filename = shell_unquote(open_filename);
chflags = 0;
if (alt_pipe != NULL)
{
/*
* The alternate "file" is actually a pipe.
* f has already been set to the file descriptor of the pipe
* in the call to open_altfile above.
* Keep the file descriptor open because it was opened
* via popen(), and pclose() wants to close it.
*/
chflags |= CH_POPENED;
} else if (strcmp(open_filename, "-") == 0)
{
/*
* Use standard input.
* Keep the file descriptor open because we can't reopen it.
*/
f = fd0;
chflags |= CH_KEEPOPEN;
/*
* Must switch stdin to BINARY mode.
*/
SET_BINARY(f);
#if MSDOS_COMPILER==DJGPPC
/*
* Setting stdin to binary by default causes
* Ctrl-C to not raise SIGINT. We must undo
* that side-effect.
*/
__djgpp_set_ctrl_c(1);
#endif
} else if (strcmp(open_filename, FAKE_HELPFILE) == 0)
{
f = -1;
chflags |= CH_HELPFILE;
} else if ((parg.p_string = bad_file(open_filename)) != NULL)
{
/*
* It looks like a bad file. Don't try to open it.
*/
error("%s", &parg);
free(parg.p_string);
err1:
if (alt_filename != NULL)
{
close_altfile(alt_filename, filename, alt_pipe);
free(alt_filename);
}
del_ifile(ifile);
free(qopen_filename);
free(filename);
/*
* Re-open the current file.
*/
if (was_curr_ifile == ifile)
{
/*
* Whoops. The "current" ifile is the one we just deleted.
* Just give up.
*/
quit(QUIT_ERROR);
}
reedit_ifile(was_curr_ifile);
return (1);
} else if ((f = open(qopen_filename, OPEN_READ)) < 0)
{
/*
* Got an error trying to open it.
*/
parg.p_string = errno_message(filename);
error("%s", &parg);
free(parg.p_string);
goto err1;
} else
{
chflags |= CH_CANSEEK;
if (!force_open && !opened(ifile) && bin_file(f))
{
/*
* Looks like a binary file.
* Ask user if we should proceed.
*/
parg.p_string = filename;
answer = query("\"%s\" may be a binary file. See it anyway? ",
&parg);
if (answer != 'y' && answer != 'Y')
{
close(f);
goto err1;
}
}
}
/*
* Get the new ifile.
* Get the saved position for the file.
*/
if (was_curr_ifile != NULL_IFILE)
{
old_ifile = was_curr_ifile;
unsave_ifile(was_curr_ifile);
}
curr_ifile = ifile;
curr_altfilename = alt_filename;
curr_altpipe = alt_pipe;
set_open(curr_ifile); /* File has been opened */
get_pos(curr_ifile, &initial_scrpos);
new_file = TRUE;
ch_init(f, chflags);
if (!(chflags & CH_HELPFILE))
{
#if LOGFILE
if (namelogfile != NULL && is_tty)
use_logfile(namelogfile);
#endif
#if HAVE_STAT_INO
/* Remember the i-number and device of the opened file. */
{
struct stat statbuf;
int r = stat(qopen_filename, &statbuf);
if (r == 0)
{
curr_ino = statbuf.st_ino;
curr_dev = statbuf.st_dev;
}
}
#endif
if (every_first_cmd != NULL)
ungetsc(every_first_cmd);
}
free(qopen_filename);
no_display = !any_display;
flush();
any_display = TRUE;
if (is_tty)
{
/*
* Output is to a real tty.
*/
/*
* Indicate there is nothing displayed yet.
*/
pos_clear();
clr_linenum();
#if HILITE_SEARCH
clr_hilite();
#endif
cmd_addhist(ml_examine, filename);
if (no_display && errmsgs > 0)
{
/*
* We displayed some messages on error output
* (file descriptor 2; see error() function).
* Before erasing the screen contents,
* display the file name and wait for a keystroke.
*/
parg.p_string = filename;
error("%s", &parg);
}
}
free(filename);
return (0);
}
/*
* Edit a space-separated list of files.
* For each filename in the list, enter it into the ifile list.
* Then edit the first one.
*/
public int
edit_list(filelist)
char *filelist;
{
IFILE save_ifile;
char *good_filename;
char *filename;
char *gfilelist;
char *gfilename;
struct textlist tl_files;
struct textlist tl_gfiles;
save_ifile = save_curr_ifile();
good_filename = NULL;
/*
* Run thru each filename in the list.
* Try to glob the filename.
* If it doesn't expand, just try to open the filename.
* If it does expand, try to open each name in that list.
*/
init_textlist(&tl_files, filelist);
filename = NULL;
while ((filename = forw_textlist(&tl_files, filename)) != NULL)
{
gfilelist = lglob(filename);
init_textlist(&tl_gfiles, gfilelist);
gfilename = NULL;
while ((gfilename = forw_textlist(&tl_gfiles, gfilename)) != NULL)
{
if (edit(gfilename) == 0 && good_filename == NULL)
good_filename = get_filename(curr_ifile);
}
free(gfilelist);
}
/*
* Edit the first valid filename in the list.
*/
if (good_filename == NULL)
{
unsave_ifile(save_ifile);
return (1);
}
if (get_ifile(good_filename, curr_ifile) == curr_ifile)
{
/*
* Trying to edit the current file; don't reopen it.
*/
unsave_ifile(save_ifile);
return (0);
}
reedit_ifile(save_ifile);
return (edit(good_filename));
}
/*
* Edit the first file in the command line (ifile) list.
*/
public int
edit_first()
{
curr_ifile = NULL_IFILE;
return (edit_next(1));
}
/*
* Edit the last file in the command line (ifile) list.
*/
public int
edit_last()
{
curr_ifile = NULL_IFILE;
return (edit_prev(1));
}
/*
* Edit the n-th next or previous file in the command line (ifile) list.
*/
static int
edit_istep(h, n, dir)
IFILE h;
int n;
int dir;
{
IFILE next;
/*
* Skip n filenames, then try to edit each filename.
*/
for (;;)
{
next = (dir > 0) ? next_ifile(h) : prev_ifile(h);
if (--n < 0)
{
if (edit_ifile(h) == 0)
break;
}
if (next == NULL_IFILE)
{
/*
* Reached end of the ifile list.
*/
return (1);
}
if (ABORT_SIGS())
{
/*
* Interrupt breaks out, if we're in a long
* list of files that can't be opened.
*/
return (1);
}
h = next;
}
/*
* Found a file that we can edit.
*/
return (0);
}
static int
edit_inext(h, n)
IFILE h;
int n;
{
return (edit_istep(h, n, +1));
}
public int
edit_next(n)
int n;
{
return edit_istep(curr_ifile, n, +1);
}
static int
edit_iprev(h, n)
IFILE h;
int n;
{
return (edit_istep(h, n, -1));
}
public int
edit_prev(n)
int n;
{
return edit_istep(curr_ifile, n, -1);
}
/*
* Edit a specific file in the command line (ifile) list.
*/
public int
edit_index(n)
int n;
{
IFILE h;
h = NULL_IFILE;
do
{
if ((h = next_ifile(h)) == NULL_IFILE)
{
/*
* Reached end of the list without finding it.
*/
return (1);
}
} while (get_index(h) != n);
return (edit_ifile(h));
}
public IFILE
save_curr_ifile()
{
if (curr_ifile != NULL_IFILE)
hold_ifile(curr_ifile, 1);
return (curr_ifile);
}
public void
unsave_ifile(save_ifile)
IFILE save_ifile;
{
if (save_ifile != NULL_IFILE)
hold_ifile(save_ifile, -1);
}
/*
* Reedit the ifile which was previously open.
*/
public void
reedit_ifile(save_ifile)
IFILE save_ifile;
{
IFILE next;
IFILE prev;
/*
* Try to reopen the ifile.
* Note that opening it may fail (maybe the file was removed),
* in which case the ifile will be deleted from the list.
* So save the next and prev ifiles first.
*/
unsave_ifile(save_ifile);
next = next_ifile(save_ifile);
prev = prev_ifile(save_ifile);
if (edit_ifile(save_ifile) == 0)
return;
/*
* If can't reopen it, open the next input file in the list.
*/
if (next != NULL_IFILE && edit_inext(next, 0) == 0)
return;
/*
* If can't open THAT one, open the previous input file in the list.
*/
if (prev != NULL_IFILE && edit_iprev(prev, 0) == 0)
return;
/*
* If can't even open that, we're stuck. Just quit.
*/
quit(QUIT_ERROR);
}
public void
reopen_curr_ifile()
{
IFILE save_ifile = save_curr_ifile();
close_file();
reedit_ifile(save_ifile);
}
/*
* Edit standard input.
*/
public int
edit_stdin()
{
if (isatty(fd0))
{
error("Missing filename (\"less --help\" for help)", NULL_PARG);
quit(QUIT_OK);
}
return (edit("-"));
}
/*
* Copy a file directly to standard output.
* Used if standard output is not a tty.
*/
public void
cat_file()
{
register int c;
while ((c = ch_forw_get()) != EOI)
putchr(c);
flush();
}
#if LOGFILE
/*
* If the user asked for a log file and our input file
* is standard input, create the log file.
* We take care not to blindly overwrite an existing file.
*/
public void
use_logfile(filename)
char *filename;
{
register int exists;
register int answer;
PARG parg;
if (ch_getflags() & CH_CANSEEK)
/*
* Can't currently use a log file on a file that can seek.
*/
return;
/*
* {{ We could use access() here. }}
*/
filename = shell_unquote(filename);
exists = open(filename, OPEN_READ);
close(exists);
exists = (exists >= 0);
/*
* Decide whether to overwrite the log file or append to it.
* If it doesn't exist we "overwrite" it.
*/
if (!exists || force_logfile)
{
/*
* Overwrite (or create) the log file.
*/
answer = 'O';
} else
{
/*
* Ask user what to do.
*/
parg.p_string = filename;
answer = query("Warning: \"%s\" exists; Overwrite, Append or Don't log? ", &parg);
}
loop:
switch (answer)
{
case 'O': case 'o':
/*
* Overwrite: create the file.
*/
logfile = creat(filename, 0644);
break;
case 'A': case 'a':
/*
* Append: open the file and seek to the end.
*/
logfile = open(filename, OPEN_APPEND);
if (lseek(logfile, (off_t)0, SEEK_END) == BAD_LSEEK)
{
close(logfile);
logfile = -1;
}
break;
case 'D': case 'd':
/*
* Don't do anything.
*/
free(filename);
return;
case 'q':
quit(QUIT_OK);
/*NOTREACHED*/
default:
/*
* Eh?
*/
answer = query("Overwrite, Append, or Don't log? (Type \"O\", \"A\", \"D\" or \"q\") ", NULL_PARG);
goto loop;
}
if (logfile < 0)
{
/*
* Error in opening logfile.
*/
parg.p_string = filename;
error("Cannot write to \"%s\"", &parg);
free(filename);
return;
}
free(filename);
SET_BINARY(logfile);
}
#endif