707 lines
14 KiB
C
Executable File
707 lines
14 KiB
C
Executable File
/* Copyright (c) 1985 Ceriel J.H. Jacobs */
|
|
|
|
# ifndef lint
|
|
static char rcsid[] = "$Header$";
|
|
# endif
|
|
|
|
# define _COMMANDS_
|
|
|
|
# include "in_all.h"
|
|
# include "commands.h"
|
|
# include "output.h"
|
|
# include "process.h"
|
|
# include "help.h"
|
|
# include "term.h"
|
|
# include "prompt.h"
|
|
# include "getline.h"
|
|
# include "getcomm.h"
|
|
# include "pattern.h"
|
|
# include "display.h"
|
|
# include "options.h"
|
|
# include "machine.h"
|
|
# include "keys.h"
|
|
# include "main.h"
|
|
# include "assert.h"
|
|
# if USG_OPEN
|
|
# include <fcntl.h>
|
|
# include <errno.h>
|
|
extern int errno;
|
|
# endif
|
|
# if BSD4_2_OPEN
|
|
# include <sys/file.h>
|
|
# include <errno.h>
|
|
extern int errno;
|
|
# endif
|
|
# if POSIX_OPEN
|
|
# include <sys/types.h>
|
|
# include <fcntl.h>
|
|
# include <errno.h>
|
|
# endif
|
|
|
|
char *strcpy(), *strcat();
|
|
|
|
static long lastcount; /* Save last count for '.' command */
|
|
static int lastcomm; /* Save last command for '.' command */
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_nocomm(cnt) long cnt; { /* Do nothing */
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
do_chkm(cnt) long cnt; { /* Change key map */
|
|
register struct keymap *p;
|
|
|
|
if (!(p = othermap)) {
|
|
error("No other keymap");
|
|
return;
|
|
}
|
|
othermap = currmap;
|
|
currmap = p;
|
|
}
|
|
|
|
static int searchdir; /* Direction of last search */
|
|
|
|
/*
|
|
* Perform searches
|
|
*/
|
|
|
|
STATIC VOID
|
|
do_search(str,cnt,dir) char *str; long cnt; int dir; {
|
|
register char *p;
|
|
register long lineno;
|
|
|
|
if (str) {
|
|
/*
|
|
* We have to get a pattern, which we have to prompt for
|
|
* with the string "str".
|
|
*/
|
|
if ((p = readline(str)) == 0) {
|
|
/*
|
|
* User cancelled command
|
|
*/
|
|
return;
|
|
}
|
|
if ((p = re_comp(p))) {
|
|
/*
|
|
* There was an error in the pattern
|
|
*/
|
|
error(p);
|
|
return;
|
|
}
|
|
searchdir = dir;
|
|
}
|
|
if (dir < 0) lineno = scr_info.firstline;
|
|
else lineno = scr_info.lastline;
|
|
for (;;) {
|
|
p = 0;
|
|
if ((lineno += dir) > 0) p = getline(lineno, 0);
|
|
if (interrupt) return;
|
|
if (!p) { /* End of file reached */
|
|
error("pattern not found");
|
|
return;
|
|
}
|
|
if (re_exec(p) && --cnt <= 0) {
|
|
/*
|
|
* We found the pattern, and we found it often enough.
|
|
* Pity that we still don't know where the match is.
|
|
* We only know the linenumber. So, we just hope the
|
|
* following will at least bring it on the screen ...
|
|
*/
|
|
(VOID) display(lineno,0,pagesize,0);
|
|
(VOID) scrollb(2,0);
|
|
redraw(0);
|
|
return;
|
|
}
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
STATIC int
|
|
do_fsearch(cnt) long cnt; { /* Forward search */
|
|
|
|
do_search("/", cnt, 1);
|
|
}
|
|
|
|
STATIC int
|
|
do_bsearch(cnt) long cnt; { /* Backward search */
|
|
|
|
do_search("?", cnt, -1);
|
|
}
|
|
|
|
/*
|
|
* Repeat last search in direction "dir"
|
|
*/
|
|
|
|
STATIC int
|
|
n_or_rn_search(cnt,dir) long cnt; int dir; {
|
|
register char *p;
|
|
|
|
if (dir == 1) {
|
|
p = "/\r";
|
|
}
|
|
else if (dir == -1) {
|
|
p = "?\r";
|
|
}
|
|
else {
|
|
error("No previous pattern");
|
|
return;
|
|
}
|
|
if (!stupid) clrbline();
|
|
putline(p);
|
|
flush();
|
|
do_search((char *) 0, cnt, dir);
|
|
}
|
|
|
|
STATIC int
|
|
do_nsearch(cnt) long cnt; { /* Repeat search in same direction */
|
|
|
|
n_or_rn_search(cnt,searchdir);
|
|
}
|
|
|
|
STATIC int
|
|
do_rnsearch(cnt) long cnt; { /* Repeat search in opposite direction */
|
|
|
|
n_or_rn_search(cnt, -searchdir);
|
|
}
|
|
|
|
STATIC int shell(esc_ch, cnt) long cnt;
|
|
{
|
|
register char *p;
|
|
static char buf[2];
|
|
|
|
buf[0] = esc_ch;
|
|
if (p = readline(buf)) {
|
|
shellescape(p, esc_ch);
|
|
if (cnt >= 0 && !hardcopy) {
|
|
p = startcomm;
|
|
startcomm = 0;
|
|
ret_to_continue();
|
|
putline(TI);
|
|
if (!p) {
|
|
/*
|
|
* Avoid double redraw.
|
|
* After a "startcomm", a redraw will
|
|
* take place anyway.
|
|
*/
|
|
redraw(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
do_shell(cnt) long cnt; { /* Execute a shell escape */
|
|
shell('!', cnt);
|
|
}
|
|
|
|
STATIC int
|
|
do_pipe(cnt) long cnt; { /* Execute a shell escape */
|
|
shell('|', cnt);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_writefile(cnt) long cnt; { /* Write input to a file */
|
|
register char *p;
|
|
int fd;
|
|
|
|
if ((p = readline("Filename: ")) == 0 || !*p) {
|
|
/*
|
|
* No file name given
|
|
*/
|
|
return;
|
|
}
|
|
# if USG_OPEN || BSD4_2_OPEN || POSIX_OPEN
|
|
if ((fd = open(p,O_CREAT|O_EXCL|O_WRONLY,0644)) < 0) {
|
|
if (errno == EEXIST) {
|
|
error("File exists");
|
|
return;
|
|
}
|
|
error("Could not open file");
|
|
return;
|
|
}
|
|
# else
|
|
if (!access(p,0)) {
|
|
error("File exists");
|
|
return;
|
|
}
|
|
if ((fd = creat(p,0644)) < 0) {
|
|
error("Could not open file");
|
|
return;
|
|
}
|
|
# endif
|
|
wrt_fd(fd);
|
|
(VOID) close(fd);
|
|
}
|
|
|
|
VOID
|
|
wrt_fd(fd)
|
|
{
|
|
register long l = 1;
|
|
register char *p = getline(l,0), *pbuf;
|
|
char buf[1024];
|
|
|
|
while (p) {
|
|
pbuf = buf;
|
|
while (p && pbuf < &buf[1024]) {
|
|
if (!*p) {
|
|
*pbuf++ = '\n';
|
|
p = getline(++l,0);
|
|
}
|
|
else *pbuf++ = *p++ & 0177;
|
|
}
|
|
if (write(fd, buf, pbuf - buf) < 0) {
|
|
error("Write failed");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
do_absolute(cnt) long cnt; { /* Go to linenumber "cnt" */
|
|
|
|
if (!getline(cnt,0)) { /* Not there or interrupt */
|
|
if (!interrupt) {
|
|
/*
|
|
* User did'nt give an interrupt, so the line number
|
|
* was too high. Go to the last line.
|
|
*/
|
|
do_lline(cnt);
|
|
}
|
|
return;
|
|
}
|
|
(VOID) display(cnt,0,pagesize,1);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_visit(cnt) long cnt; { /* Visit a file */
|
|
register char *p;
|
|
static char fn[128]; /* Keep file name */
|
|
|
|
if ((p = readline("Filename: ")) == 0) {
|
|
return;
|
|
}
|
|
if (*p) {
|
|
(VOID) strcpy(fn,p);
|
|
visitfile(fn);
|
|
}
|
|
else {
|
|
/*
|
|
* User typed a return. Visit the current file
|
|
*/
|
|
if (!(p = filenames[filecount])) {
|
|
error("No current file");
|
|
return;
|
|
}
|
|
visitfile(p);
|
|
}
|
|
(VOID) display(1L, 0, pagesize, 1);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_error(cnt) long cnt; { /* Called when user types wrong key sequence */
|
|
|
|
error(currmap->k_help);
|
|
}
|
|
|
|
/*
|
|
* Interface routine for displaying previous screen,
|
|
* depending on cflag.
|
|
*/
|
|
|
|
STATIC int
|
|
prev_screen(sz,really) int sz, really; {
|
|
register int retval;
|
|
|
|
retval = scrollb(sz - 1, really && cflag);
|
|
if (really && !cflag) {
|
|
/*
|
|
* The previous call did not display anything, but at least we
|
|
* know where to start
|
|
*/
|
|
return display(scr_info.firstline, scr_info.nf, sz, 1);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* Interface routine for displaying the next screen,
|
|
* dependent on cflag.
|
|
*/
|
|
|
|
STATIC int
|
|
next_screen(sz,really) int sz, really; {
|
|
|
|
register int t;
|
|
register struct scr_info *p = &scr_info;
|
|
|
|
if (cflag) {
|
|
return scrollf(sz-1,really);
|
|
}
|
|
t = p->tail->cnt - 1;
|
|
if (p->lastline == p->firstline) {
|
|
t += p->nf;
|
|
}
|
|
return display(p->lastline, t, sz, really);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_redraw(cnt) long cnt; {
|
|
|
|
redraw(1);
|
|
}
|
|
|
|
STATIC int
|
|
page_size(cnt) unsigned cnt; {
|
|
|
|
if (cnt) {
|
|
if (cnt > maxpagesize) return maxpagesize;
|
|
if (cnt < MINPAGESIZE) return MINPAGESIZE;
|
|
return (int) cnt;
|
|
}
|
|
return pagesize;
|
|
}
|
|
|
|
STATIC int
|
|
do_forward(cnt) long cnt; { /* Display next page */
|
|
register int i;
|
|
|
|
i = page_size((unsigned) cnt);
|
|
if (status & EOFILE) {
|
|
/*
|
|
* May seem strange, but actually a visit to the next file
|
|
* has already been done here
|
|
*/
|
|
(VOID) display(1L,0,i,1);
|
|
return;
|
|
}
|
|
(VOID) next_screen(i,1);
|
|
}
|
|
|
|
STATIC int
|
|
do_backward(cnt) long cnt; {
|
|
register int i, temp;
|
|
|
|
i = page_size((unsigned) cnt);
|
|
if (!(status & START)) {
|
|
(VOID) prev_screen(i,1);
|
|
return;
|
|
}
|
|
if (stdf < 0) {
|
|
(VOID) display(1L,0,i,1);
|
|
return;
|
|
}
|
|
/*
|
|
* The next part is a bit clumsy.
|
|
* We want to display the last page of the previous file (for which
|
|
* a visit has already been done), but the pagesize may temporarily
|
|
* be different because the command had a count
|
|
*/
|
|
temp = pagesize;
|
|
pagesize = i;
|
|
do_lline(cnt);
|
|
pagesize = temp;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_firstline(cnt) long cnt; { /* Go to start of input */
|
|
|
|
do_absolute(1L);
|
|
}
|
|
|
|
STATIC int
|
|
do_lline(cnt) long cnt; { /* Go to end of input */
|
|
register int i = 0;
|
|
register int j = pagesize - 1;
|
|
|
|
if ((cnt = to_lastline()) < 0) {
|
|
/*
|
|
* Interrupted by the user
|
|
*/
|
|
return;
|
|
}
|
|
/*
|
|
* Display the page such that only the last line of the page is
|
|
* a "~", independant of the pagesize
|
|
*/
|
|
while (!(display(cnt,i,j,0) & EOFILE)) {
|
|
/*
|
|
* The last line could of course be very long ...
|
|
*/
|
|
i+= j;
|
|
}
|
|
(VOID) scrollb(j - scr_info.tail->cnt, 0);
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
do_lf(cnt) long cnt; { /* Display next line, or go to line */
|
|
|
|
if (cnt) { /* Go to line */
|
|
do_absolute(cnt);
|
|
return;
|
|
}
|
|
(VOID) scrollf(1,1);
|
|
}
|
|
|
|
STATIC int
|
|
do_upline(cnt) long cnt; { /* Display previous line, or go to line */
|
|
|
|
if (cnt) { /* Go to line */
|
|
do_absolute(cnt);
|
|
return;
|
|
}
|
|
(VOID) scrollb(1,1);
|
|
}
|
|
|
|
STATIC int
|
|
do_skiplines(cnt) long cnt; { /* Skip lines forwards */
|
|
|
|
/* Should be interruptable ... */
|
|
(VOID) scrollf((int) (cnt + maxpagesize - 1), 0);
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
do_bskiplines(cnt) long cnt; { /* Skip lines backwards */
|
|
|
|
/* Should be interruptable ... */
|
|
(VOID) scrollb((int) (cnt + pagesize - 1), 0);
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
do_fscreens(cnt) long cnt; { /* Skip screens forwards */
|
|
|
|
do {
|
|
if ((next_screen(pagesize,0) & EOFILE) || interrupt) break;
|
|
} while (--cnt >= 0);
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
do_bscreens(cnt) long cnt; { /* Skip screens backwards */
|
|
|
|
do {
|
|
if ((prev_screen(pagesize,0) & START) || interrupt) break;
|
|
} while (--cnt >= 0);
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
scro_size(cnt) unsigned cnt; {
|
|
|
|
if (cnt >= maxpagesize) return maxpagesize;
|
|
if (cnt) return (int) cnt;
|
|
return scrollsize;
|
|
}
|
|
|
|
STATIC int
|
|
do_f_scroll(cnt) long cnt; { /* Scroll forwards */
|
|
|
|
(VOID) scrollf(scro_size((unsigned) cnt),1);
|
|
}
|
|
|
|
STATIC int
|
|
do_b_scroll(cnt) long cnt; { /* Scroll backwards */
|
|
|
|
(VOID) scrollb(scro_size((unsigned) cnt),1);
|
|
}
|
|
|
|
STATIC int
|
|
do_previousfile(cnt) long cnt; {/* Visit previous file */
|
|
|
|
if (nextfile(- (int) cnt)) {
|
|
error("No (Nth) previous file");
|
|
return;
|
|
}
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int
|
|
do_nextfile(cnt) long cnt; { /* Visit next file */
|
|
|
|
if (nextfile((int) cnt)) {
|
|
error("No (Nth) next file");
|
|
return;
|
|
}
|
|
redraw(0);
|
|
}
|
|
|
|
STATIC int do_lcomm();
|
|
|
|
/*
|
|
* The next array is initialized, sorted on the first element of the structs,
|
|
* so that we can perform binary search
|
|
*/
|
|
struct commands commands[] = {
|
|
{"", 0, do_error, ""},
|
|
{"", 0, do_nocomm, ""},
|
|
{"bf", STICKY|NEEDS_COUNT,
|
|
do_previousfile,"Visit previous file"},
|
|
{"bl", NEEDS_SCREEN|STICKY,
|
|
do_upline, "Scroll one line up, or go to line"},
|
|
{"bot", STICKY,
|
|
do_lline, "Go to last line of the input"},
|
|
{"bp", BACK|NEEDS_SCREEN|TOPREVFILE|STICKY,
|
|
do_backward, "display previous page"},
|
|
{"bps", SCREENSIZE_ADAPT|BACK|NEEDS_SCREEN|TOPREVFILE|STICKY,
|
|
do_backward, "Display previous page, set pagesize"},
|
|
{"bs", BACK|NEEDS_SCREEN|STICKY,
|
|
do_b_scroll, "Scroll backwards"},
|
|
{"bse", 0, do_bsearch, "Search backwards for pattern"},
|
|
{"bsl", BACK|NEEDS_SCREEN|STICKY|NEEDS_COUNT,
|
|
do_bskiplines, "Skip lines backwards"},
|
|
{"bsp", BACK|NEEDS_SCREEN|STICKY|NEEDS_COUNT,
|
|
do_bscreens, "Skip screens backwards"},
|
|
{"bss", SCROLLSIZE_ADAPT|BACK|NEEDS_SCREEN|STICKY,
|
|
do_b_scroll, "Scroll backwards, set scrollsize"},
|
|
{"chm", 0, do_chkm, "Switch to other keymap"},
|
|
{"exg", STICKY, exgmark, "Exchange current page with mark"},
|
|
{"ff", STICKY|NEEDS_COUNT,
|
|
do_nextfile, "Visit next file"},
|
|
{"fl", NEEDS_SCREEN|STICKY,
|
|
do_lf, "Scroll one line down, or go to line"},
|
|
{"fp", TONEXTFILE|AHEAD|STICKY,
|
|
do_forward, "Display next page"},
|
|
{"fps", SCREENSIZE_ADAPT|TONEXTFILE|AHEAD|STICKY,
|
|
do_forward, "Display next page, set pagesize"},
|
|
{"fs", AHEAD|NEEDS_SCREEN|STICKY,
|
|
do_f_scroll, "Scroll forwards"},
|
|
{"fse", 0, do_fsearch, "Search forwards for pattern"},
|
|
{"fsl", AHEAD|NEEDS_SCREEN|STICKY|NEEDS_COUNT,
|
|
do_skiplines, "Skip lines forwards"},
|
|
{"fsp", AHEAD|NEEDS_SCREEN|STICKY|NEEDS_COUNT,
|
|
do_fscreens, "Skip screens forwards"},
|
|
{"fss", SCROLLSIZE_ADAPT|AHEAD|NEEDS_SCREEN|STICKY,
|
|
do_f_scroll, "Scroll forwards, set scrollsize"},
|
|
{"hlp", 0, do_help, "Give description of all commands"},
|
|
{"mar", 0, setmark, "Set a mark on the current page"},
|
|
{"nse", STICKY, do_nsearch, "Repeat the last search"},
|
|
{"nsr", STICKY, do_rnsearch, "Repeat last search in other direction"},
|
|
{"pip", ESC, do_pipe, "pipe input into shell command"},
|
|
{"qui", 0, quit, "Exit from yap"},
|
|
{"red", 0, do_redraw, "Redraw screen"},
|
|
{"rep", 0, do_lcomm, "Repeat last command"},
|
|
{"shl", ESC, do_shell, "Execute a shell escape"},
|
|
{"tom", 0, tomark, "Go to mark"},
|
|
{"top", STICKY, do_firstline, "Go to the first line of the input"},
|
|
{"vis", 0, do_visit, "Visit a file"},
|
|
{"wrf", 0, do_writefile, "Write input to a file"},
|
|
};
|
|
|
|
/*
|
|
* Lookup string "s" in the commands array, and return index.
|
|
* return 0 if not found.
|
|
*/
|
|
|
|
int
|
|
lookup(s) char *s; {
|
|
register struct commands *l, *u, *m;
|
|
|
|
l = &commands[2];
|
|
u = &commands[sizeof(commands) / sizeof(*u) - 1];
|
|
do {
|
|
/*
|
|
* Perform binary search
|
|
*/
|
|
m = l + (u - l) / 2;
|
|
if (strcmp(s, m->c_cmd) > 0) l = m + 1;
|
|
else u = m;
|
|
} while (l < u);
|
|
if (!strcmp(s, u->c_cmd)) return u - commands;
|
|
return 0;
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
STATIC int
|
|
do_lcomm(cnt) long cnt; { /* Repeat last command */
|
|
|
|
if (!lastcomm) {
|
|
error("No previous command");
|
|
return;
|
|
}
|
|
do_comm(lastcomm, lastcount);
|
|
}
|
|
|
|
/*
|
|
* Execute a command, with optional count "count".
|
|
*/
|
|
|
|
VOID
|
|
do_comm(comm, count) register int comm; register long count; {
|
|
|
|
register struct commands *pcomm;
|
|
register int temp;
|
|
register int flags;
|
|
|
|
pcomm = &commands[comm];
|
|
flags = pcomm->c_flags;
|
|
|
|
/*
|
|
* Check the command.
|
|
* If the last line of the file is displayed and the command goes
|
|
* forwards and does'nt have the ability to go to the next file, it
|
|
* is an error.
|
|
* If the first line of the file is displayed and the command goes
|
|
* backwards and does'nt have the ability to go to the previous file,
|
|
* it is an error.
|
|
* Also check wether we need the next or previous file. If so, get it.
|
|
*/
|
|
if ((status & EOFILE) && (flags & AHEAD)) {
|
|
if (qflag || !(flags & TONEXTFILE)) return;
|
|
if (nextfile(1)) quit();
|
|
}
|
|
if ((status & START) && (flags & BACK)) {
|
|
if (qflag || !(flags & TOPREVFILE)) return;
|
|
if (nextfile(-1)) quit();
|
|
}
|
|
/*
|
|
* Does the command stick around for LASTCOMM?
|
|
*/
|
|
if (flags & STICKY) {
|
|
lastcomm = comm;
|
|
lastcount = count;
|
|
}
|
|
if (!count) {
|
|
if (flags & NEEDS_COUNT) count = 1;
|
|
}
|
|
else {
|
|
/*
|
|
* Does the command adapt the screensize?
|
|
*/
|
|
if (flags & SCREENSIZE_ADAPT) {
|
|
temp = maxpagesize;
|
|
if ((unsigned) count < temp) {
|
|
temp = count;
|
|
}
|
|
if (temp < MINPAGESIZE) {
|
|
temp = MINPAGESIZE;
|
|
}
|
|
count = 0;
|
|
pagesize = temp;
|
|
}
|
|
/*
|
|
* Does the command adapt the scrollsize?
|
|
*/
|
|
if (flags & SCROLLSIZE_ADAPT) {
|
|
temp = maxpagesize - 1;
|
|
if ((unsigned) count < temp) {
|
|
temp = (int) count;
|
|
}
|
|
scrollsize = temp;
|
|
count = 0;
|
|
}
|
|
}
|
|
/*
|
|
* Now execute the command.
|
|
*/
|
|
(*(pcomm->c_func))(count);
|
|
}
|