gno/bin/less/edit.c

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#pragma noroot
#include "less.h"
#if __MSDOS__
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#endif
#ifdef _ORCAC_
#include <unistd.h>
#include <fcntl.h>
segment "LoadSegONE";
#endif
#define ISPIPE(fd) ((fd)==STDIN_FILENO)
extern int ispipe;
extern int new_file;
extern int errmsgs;
extern int quit_at_eof;
extern int file;
extern int cbufs;
extern char *every_first_cmd;
extern int any_display;
extern int force_open;
extern int is_tty;
extern IFILE curr_ifile;
extern IFILE old_ifile;
extern struct scrpos initial_scrpos;
#if LOGFILE
extern int logfile;
extern int force_logfile;
extern char *namelogfile;
#endif
/*
* Edit a new file.
* Filename == "-" means standard input.
* Filename == NULL means just close the current file.
*/
public int
edit(filename, just_looking)
register char *filename;
int just_looking;
{
register int f;
char *s;
int answer;
int no_display;
struct scrpos scrpos;
PARG parg;
if (filename == NULL)
{
/*
* Close the current file, but don't open a new one.
*/
f = -1;
} else if (strcmp(filename, "-") == 0)
{
/*
* Use standard input.
*/
f = STDIN_FILENO;
} else if ((parg.p_string = bad_file(filename)) != NULL)
{
error("\r%s\r", &parg);
free(parg.p_string);
return (1);
#if __MSDOS__
} else if ((f = open(filename, O_RDONLY|O_BINARY)) < 0)
#else
/* } else if ((f = open(filename, 0)) < 0)*/
} else if ((f = open(filename, O_RDONLY|O_BINARY)) < 0)
#endif
{
parg.p_string = errno_message(filename);
error("%s", &parg);
free(parg.p_string);
return (1);
} else if (!force_open && !just_looking && bin_file(f))
{
parg.p_string = filename;
answer = query("\"%s\" may be a binary file. Continue? ",
&parg);
if (answer != 'y' && answer != 'Y')
{
close(f);
return (1);
}
}
if (f >= 0 && isatty(f))
{
/*
* Not really necessary to call this an error,
* but if the control terminal (for commands)
* and the input file (for data) are the same,
* we get weird results at best.
*/
#if __MSDOS__
parg.p_string = "less -?";
#else
parg.p_string = "less -\\?";
#endif
error("Cannot take input from a terminal (\"%s\" for help)",
&parg);
if (!ISPIPE(f))
close(f);
return (1);
}
#if LOGFILE
s = namelogfile;
end_logfile();
if (f >= 0 && ISPIPE(f) && s != NULL && is_tty)
use_logfile(s);
#endif
/*
* We are now committed to using the new file.
* Close the current input file and set up to use the new one.
*/
if (curr_ifile != NULL_IFILE)
{
/*
* 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 current file, unless it is a pipe.
*/
if (!ISPIPE(file))
close(file);
file = f;
if (f < 0)
return (1);
/*
* Get the new ifile.
* Get the saved position for that file.
*/
old_ifile = curr_ifile;
curr_ifile = get_ifile(filename, curr_ifile);
get_pos(curr_ifile, &initial_scrpos);
ispipe = ISPIPE(f);
if (ispipe)
ch_pipe();
else
ch_nonpipe();
(void) ch_nbuf(cbufs);
ch_flush();
new_file = 1;
#if __MSDOS__
top_filename();
#endif
if (every_first_cmd != NULL)
ungetsc(every_first_cmd);
no_display = !any_display;
flush();
any_display = 1;
if (is_tty)
{
/*
* Output is to a real tty.
*/
/*
* Indicate there is nothing displayed yet.
*/
pos_clear();
clr_linenum();
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);
}
}
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 void
edit_list(list)
char *list;
{
register char *s;
register char *es;
register char *filename;
char *good_filename;
IFILE save_curr_ifile;
/*
* good_filename keeps track of the first valid filename.
*/
good_filename = NULL;
s = list;
es = s + strlen(s);
save_curr_ifile = curr_ifile;
while ((s = skipsp(s)) < es)
{
/*
* Get the next filename and null terminate it.
*/
filename = s;
while (*s != ' ' && *s != '\0')
s++;
if (*s != '\0')
*s++ = '\0';
/*
* Try to edit the file.
* This enters it into the command line list (if it is good).
* If it is the first good file we've seen, remember it.
* {{ A little weirdness here: if any of the filenames
* are already in the list, subsequent ones get
* entered after the position where that one already
* was, instead of at the end. }}
*/
if (edit(filename, 1) == 0 && good_filename == NULL)
good_filename = filename;
}
/*
* Edit the first valid filename in the list.
*/
if (good_filename != NULL)
{
curr_ifile = save_curr_ifile;
(void) edit(good_filename, 0);
}
}
/*
* Edit the first file in the command line (ifile) list.
*/
public int
edit_first(void)
{
curr_ifile = NULL_IFILE;
return (edit_next(1));
}
/*
* Edit the last file in the command line (ifile) list.
*/
public int
edit_last(void)
{
curr_ifile = NULL_IFILE;
return (edit_prev(1));
}
/*
* Edit the next file in the command line (ifile) list.
*/
public int
edit_next(n)
int n;
{
IFILE h;
h = curr_ifile;
while (--n >= 0 || edit(get_filename(h), 0))
{
if ((h = next_ifile(h)) == NULL_IFILE)
/*
* Reached end of the ifile list.
*/
return (1);
}
/*
* Found a file that we can edit.
*/
return (0);
}
/*
* Edit the previous file in the command line list.
*/
public int
edit_prev(n)
int n;
{
IFILE h;
h = curr_ifile;
while (--n >= 0 || edit(get_filename(h), 0))
{
if ((h = prev_ifile(h)) == NULL_IFILE)
/*
* Reached beginning of the ifile list.
*/
return (1);
}
/*
* Found a file that we can edit.
*/
return (0);
}
/*
* 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(get_filename(h), 0));
}
/*
* Copy a file directly to standard output.
* Used if standard output is not a tty.
*/
public void
cat_file(void)
{
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;
/*
* {{ We could use access() here. }}
*/
/* exists = open(filename, 0);*/
exists = open(filename, O_RDWR);
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.
*/
#if __MSDOS__
logfile = open(filename, O_APPEND|O_WRONLY);
#else
/* logfile = open(filename, 1);*/
logfile = open(filename, O_APPEND|O_WRONLY);
#endif
if (lseek(logfile, (offset_t)0, 2) == BAD_LSEEK)
{
close(logfile);
logfile = -1;
}
break;
case 'D': case 'd':
/*
* Don't do anything.
*/
return;
case 'q':
quit(0);
/*NOTREACHED*/
default:
/*
* Eh?
*/
answer = query("Overwrite, Append, or Don't log? ", NULL_PARG);
goto loop;
}
if (logfile < 0)
{
/*
* Error in opening logfile.
*/
parg.p_string = filename;
error("Cannot write to \"%s\"", &parg);
}
}
#endif