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irix-657m-src/eoe/cmd/pg/pg.c
calmsacibis995 8fc8fa8089 Source code upload
2022-09-29 17:59:04 +03:00

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/* Copyright (c) 1990, 1991 UNIX System Laboratories, Inc. */
/* Copyright (c) 1984, 1986, 1987, 1988, 1989, 1990 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF */
/* UNIX System Laboratories, Inc. */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
/* #ident "@(#)pg:pg.c 1.31.1.4" */
#ident "$Revision: 1.10 $"
#include <signal.h>
#include <setjmp.h>
#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <ctype.h>
#include <stdio.h>
#include <curses.h>
#include <term.h>
#include <errno.h>
#include <stdlib.h>
#include <regexpr.h>
#include <limits.h>
#include <locale.h>
#include <pfmt.h>
#include <string.h>
/*
* pg -- paginator for crt terminals
*
* Includes the ability to display pages that have
* already passed by. Also gives the user the ability
* to search forward and backwards for regular expressions.
* This works for piped input by copying to a temporary file,
* and resolving backreferences from there.
*
* Note: The reason that there are so many commands to do
* the same types of things is to try to accommodate
* users of other paginators.
*/
#define LINSIZ 1024
#define QUIT '\034'
#define BOF (EOF - 1) /* Begining of File */
#define STOP (EOF - 2)
#define PROMPTSIZE 256
struct line { /* how line addresses are stored */
long l_addr; /* file offset */
int l_no; /* line number in file */
};
typedef struct line LINE;
LINE *zero = NULL, /* first line */
*dot, /* current line */
*dol; /* last line */
long nlall; /* room for how many LINEs in memory */
FILE *in_file, /* current input stream */
*tmp_fin, /* pipe temporary file in */
*tmp_fou; /* pipe temporary file out */
char tmp_name[] = "/tmp/pgXXXXXX";
long ftell();
short sign; /* sign of command input */
int fnum, /* which file argument we're in */
pipe_in, /* set when stdin is a pipe */
out_is_tty; /* set if stdout is a tty */
gid_t my_pgid;
void on_brk(),
end_it();
short brk_hit; /* interrupt handling is pending flag */
int window = 0; /* window size in lines */
short eof_pause = 1; /* pause w/ prompt at end of files */
short rmode = 0; /* deny shell escape in restricted mode */
short soflag = 0; /* output all messages in standout mode */
short promptlen; /* length of the current prompt */
short firstf = 1; /* set before first file has been processed */
short inwait, /* set while waiting for user input */
errors; /* set if error message has been printed.
* if so, need to erase it and prompt */
char **fnames;
short status = 0; /* set > 0 if error detected */
short fflag = 0; /* set if the f option is used */
short nflag = 0; /* set for "no newline" input option */
short clropt = 0; /* set if the clear option is used */
int initopt = 0; /* set if the line option is used */
int srchopt = 0; /* set if the search option is used */
int initline;
char initbuf[BUFSIZ];
char leave_search = 't'; /* where on the page to leave a found string */
int nfiles;
char *shell;
char *promptstr = ":";
char *setprompt();
short lenprompt; /* length of prompt string */
int nchars; /* return from getline in find() */
jmp_buf restore;
char Line[LINSIZ+2];
int catch_susp;
void onsusp();
struct screen_stat {
int first_line;
int last_line;
short is_eof;
};
struct screen_stat old_ss = { 0, 0, 0 };
struct screen_stat new_ss;
static struct termio otty; /* to save old terminal settings */
short termflg = 0; /* set once terminal is initialized */
short eoflag; /* set whenever at end of current file */
short doliseof; /* set when last line of file is known */
int eofl_no; /* what the last line of the file is */
int peekc; /* pushback character for read functions */
USAGE()
{
(void)pfmt(stderr, MM_ERROR, ":8:Incorrect usage\n");
(void)pfmt(stderr, MM_ACTION,
":390:Usage:\n\tpg [-number] [-p string] [-cefnrs] [+line] [+/pattern/] files\n");
exit(1);
}
main(argc, argv)
int argc;
char *argv[];
{
register char *s;
register char *p;
register char ch;
int prnames = 0;
FILE *checkf();
nfiles = argc;
fnames = argv;
(void)setlocale(LC_ALL, "");
(void)setcat("uxcore.abi");
(void)setlabel("UX:pg");
while (--nfiles > 0) {
if ((ch = (*++fnames)[0]) == '-') {
if (fnames[0][1] == '\0' )
break;
for (s = fnames[0]+1; *s != '\0'; s++)
if (isdigit(*s)) {
window = 0;
do {
window = window*10+*s-'0';
} while (isdigit(*++s));
if (*s != '\0')
USAGE();
break;
}
else if (*s == 'c')
clropt = 1;
else if (*s == 'e')
eof_pause = 0;
else if (*s == 'f')
fflag = 1;
else if (*s == 'n')
nflag = 1;
else if (*s == 'r')
rmode = 1; /* restricted mode */
else if (*s == 's')
soflag = 1; /* standout mode */
else if (*s == 'p') {
if (*++s != '\0')
promptstr = setprompt(s);
else if (nfiles > 1) {
promptstr = setprompt(*++fnames);
nfiles--;
}
else
USAGE();
break;
}
else
USAGE();
}
else if (ch == '+') {
s = *fnames;
if (*++s == '/') {
srchopt++;
initopt = 0;
for (++s, p=initbuf; *s!='\0'&& *s!='/';)
if (p < initbuf + sizeof(initbuf))
*p++ = *s++;
else {
(void)pfmt(stderr, MM_ERROR,
":391:Pattern too long\n");
exit(1);
}
*p = '\0';
}
else {
initopt++;
srchopt = 0;
for (; isdigit(*s); s++)
initline = initline*10 + *s -'0';
if (*s != '\0')
USAGE();
}
}
else
break;
}
(void) signal(SIGQUIT,end_it);
(void) signal(SIGINT,end_it);
out_is_tty = isatty(1);
my_pgid = getpgrp();
if (out_is_tty) {
terminit();
(void) signal(SIGQUIT,on_brk);
(void) signal(SIGINT,on_brk);
if (signal(SIGTSTP, SIG_IGN) == SIG_DFL) {
(void) signal(SIGTSTP, onsusp);
catch_susp++;
}
}
if (window == 0)
window = lines - 1;
lenprompt = strlen(promptstr);
if (window <= 1)
window = 2;
if (initline <= 0)
initline = 1;
if (nfiles > 1)
prnames++;
if (nfiles == 0) {
fnames[0] = "-";
nfiles++;
}
while (fnum < nfiles) {
if (strcmp(fnames[fnum],"") == 0)
fnames[fnum] = "-";
if ((in_file = checkf(fnames[fnum])) == NULL)
{
status = 2;
fnum++;
}
else {
status = 0;
if (out_is_tty)
fnum += screen(fnames[fnum]);
else {
if (prnames) {
(void) fputs("::::::::::::::\n",stdout);
(void) fputs(fnames[fnum],stdout);
(void) fputs("\n::::::::::::::\n",stdout);
}
copy_file(in_file,stdout);
fnum++;
}
(void) fflush(stdout);
if (pipe_in)
save_pipe();
else
if (in_file != tmp_fin)
(void) fclose(in_file);
}
}
end_it();
/* NOT REACHED */
}
char *
setprompt(s)
register char *s;
{
register int i = 0;
register int pct_d = 0;
static char pstr[PROMPTSIZE];
while (i < PROMPTSIZE - 2)
switch(pstr[i++] = *s++) {
case '\0':
return(pstr);
case '%':
if (*s == 'd' && !pct_d) {
pct_d++;
}
else if (*s != '%')
pstr[i++] = '%';
if ((pstr[i++] = *s++) == '\0')
return(pstr);
break;
default:
break;
}
(void) pfmt(stderr, MM_ERROR, ":392:Prompt too long\n");
exit(1);
}
/*
* Print out the contents of the file f, one screenful at a time.
*/
screen(file_name)
char *file_name;
{
int cmd_ret = 0;
int start;
short hadchance = 0;
old_ss.is_eof = 0;
old_ss.first_line = 0;
old_ss.last_line = 0;
new_ss = old_ss;
if (!firstf)
cmd_ret = command(file_name);
else {
firstf = 0;
if (initopt) {
initopt = 0;
new_ss.first_line = initline;
new_ss.last_line = initline + window - 1;
}
else
if (srchopt) {
srchopt = 0;
if (!search(initbuf,1))
cmd_ret = command(file_name);
}
else {
new_ss.first_line = 1;
new_ss.last_line = window;
}
}
for (;;) {
if (cmd_ret)
return(cmd_ret);
if (hadchance && new_ss.last_line >= eofl_no)
return(1);
hadchance = 0;
if (new_ss.last_line < window)
new_ss.last_line = window;
if (find(0,new_ss.last_line + 1) != EOF)
new_ss.is_eof = 0;
else {
new_ss.is_eof = 1;
new_ss.last_line = eofl_no - 1;
new_ss.first_line = new_ss.last_line - window + 1;
}
if (new_ss.first_line < 1)
new_ss.first_line = 1;
if (clropt) {
doclear();
start = new_ss.first_line;
}
else {
if (new_ss.first_line == old_ss.last_line)
start = new_ss.first_line + 1;
else
if (new_ss.first_line > old_ss.last_line)
start = new_ss.first_line;
else
if (old_ss.first_line < new_ss.first_line)
start = old_ss.last_line + 1;
else
start = new_ss.first_line;
if (start < old_ss.first_line)
sopr(":393", "...skipping backward\n",0);
else
if (start > old_ss.last_line + 1)
sopr(":394", "...skipping forward\n",0);
}
for(; start <= new_ss.last_line; start++) {
(void) find(0,start);
(void) fputs(Line,stdout);
if (brk_hit) {
new_ss.last_line = find(1,0);
new_ss.is_eof = 0;
break;
}
}
brk_hit = 0;
(void) fflush(stdout);
if (new_ss.is_eof) {
if (!eof_pause || eofl_no == 1)
return(1);
hadchance++;
error(":395", "(EOF)");
}
old_ss = new_ss;
cmd_ret = command((char *)NULL);
}
}
char cmdbuf[LINSIZ], *cmdptr;
#define BEEP() if (bell) { putp(bell); (void) fflush(stdout); }
#define BLANKS(p) while (*p == ' ' || *p == '\t') p++
#define CHECKEND() BLANKS(cmdptr); if (*cmdptr) { BEEP(); break; }
/*
* Read a command and do it. A command consists of an optional integer
* argument followed by the command character. Return the number of files
* to skip, 0 if we're still talking about the same file.
*/
command (filename)
char *filename;
{
register int nlines;
register char c;
FILE *sf;
char *cmdend;
pid_t id;
int skip;
for (;;) {
/* Wait for output to drain before going on. */
/* This is done so that the user will not hit */
/* break and quit before he has seen the prompt. */
(void) ioctl(1,TCSBRK,1);
if (setjmp(restore) != 0)
end_it();
inwait = 1;
brk_hit = 0;
if (errors)
errors = 0;
else {
kill_line();
prompt(filename);
}
(void) fflush(stdout);
if (ttyin())
continue;
cmdptr = cmdbuf;
nlines = number();
BLANKS(cmdptr);
switch (*cmdptr++) {
case 'h':
CHECKEND();
help();
break;
case '\014': /* ^L */
case '.': /* redisplay current window */
CHECKEND();
new_ss.first_line = old_ss.first_line;
new_ss.last_line = old_ss.last_line;
inwait = 0;
return(0);
case 'w': /* set window size */
case 'z':
if (sign == -1) {
BEEP();
break;
}
CHECKEND();
if (nlines == 0)
nlines = window;
else
if (nlines > 1)
window = nlines;
else {
BEEP();
break;
}
new_ss.first_line = old_ss.last_line;
new_ss.last_line = new_ss.first_line + window - 1;
inwait = 0;
return(0);
case '\004': /* ^D */
case 'd':
CHECKEND();
if (sign == 0)
sign = 1;
new_ss.last_line = old_ss.last_line + sign*window/2;
new_ss.first_line = new_ss.last_line - window + 1;
inwait = 0;
return(0);
case 's':
/*
* save input in filename.
* Check for filename, access, etc.
*/
BLANKS(cmdptr);
if (!*cmdptr) {
BEEP();
break;
}
if (setjmp(restore) != 0) {
BEEP();
}
else {
if ((sf=fopen(cmdptr,"w")) == NULL) {
error(":396", "Cannot open %s: %s",
cmdptr, strerror(errno));
break;
}
kill_line();
sopr(":397", "saving file ",1);
sopr(NULL, cmdptr,1);
(void) fflush(stdout);
save_input(sf);
error(":398", "saved");
}
(void) fclose(sf);
break;
case 'q':
case 'Q':
CHECKEND();
inwait = 0;
end_it();
break; /* NOT REACHED */
case 'f': /* skip forward screenfuls */
CHECKEND();
if (sign == 0)
sign++; /* skips are always relative */
if (nlines == 0)
nlines++;
nlines = nlines * (window - 1);
if (sign == 1)
new_ss.first_line = old_ss.last_line + nlines;
else
new_ss.first_line = old_ss.first_line - nlines;
new_ss.last_line = new_ss.first_line + window - 1;
inwait = 0;
return(0);
case 'l': /* get a line */
CHECKEND();
if (nlines == 0) {
nlines++;
if (sign == 0)
sign = 1;
}
switch(sign){
case 1:
new_ss.last_line = old_ss.last_line + nlines;
new_ss.first_line = new_ss.last_line - window + 1;
break;
case 0: /* leave addressed line at top */
new_ss.first_line = nlines;
new_ss.last_line = nlines + window - 1;
break;
case -1:
new_ss.first_line = old_ss.first_line - nlines;
new_ss.last_line = new_ss.first_line + window - 1;
break;
}
inwait = 0;
return(0);
case '\0': /* \n or blank */
if (nlines == 0){
nlines++;
if (sign == 0)
sign = 1;
}
nlines = (nlines - 1) * (window - 1);
switch(sign) {
case 1:
new_ss.first_line = old_ss.last_line + nlines;
new_ss.last_line = new_ss.first_line + window - 1;
break;
case 0:
new_ss.first_line = nlines + 1;
new_ss.last_line = nlines + window;
/*
This if statement is to fix the obscure bug
where you have a file that has less lines
than a screen holds, and the user types '1',
expecting to have the 1st page (re)displayed.
If we didn't set the new last_line to
eofl_no-1, the screen() routine
would cause pg to exit.
*/
if (new_ss.first_line == 1
&& new_ss.last_line >= eofl_no)
new_ss.last_line = eofl_no - 1;
break;
case -1:
new_ss.last_line = old_ss.first_line - nlines;
new_ss.first_line = new_ss.last_line - window + 1;
break;
}
inwait = 0;
return(0);
case 'n': /* switch to next file in arglist */
CHECKEND();
if (sign == 0)
sign = 1;
if (nlines == 0)
nlines++;
if ((skip = skipf(sign *nlines)) == 0) {
BEEP();
break;
}
inwait = 0;
return(skip);
case 'p': /* switch to previous file in arglist */
CHECKEND();
if (sign == 0)
sign = 1;
if (nlines == 0)
nlines++;
if ((skip = skipf(-sign * nlines)) == 0) {
BEEP();
break;
}
inwait = 0;
return(skip);
case '$': /* go to end of file */
CHECKEND();
sign = 1;
while(find(1,10000) != EOF)
/* any large number will do */;
new_ss.last_line = eofl_no - 1;
new_ss.first_line = eofl_no - window;
inwait = 0;
return(0);
case '/': /* search forward for r.e. */
case '?': /* " backwards */
case '^': /* this ones a ? for regent100s */
if(sign < 0) {
BEEP();
break;
}
if (nlines == 0)
nlines++;
cmdptr--;
cmdend = cmdptr + (strlen(cmdptr) - 1);
if ( (cmdend > cmdptr + 1)
&& (*cmdptr == *(cmdend - 1))
&& ( ((c = *cmdend) == 't')
|| (c == 'm')
|| (c == 'b') ) ) {
leave_search = c;
cmdend--;
}
if ((cmdptr < cmdend) && (*cmdptr == *cmdend))
*cmdend = '\0';
if (*cmdptr != '/') /* signify back search by - */
nlines = -nlines;
if (!search(++cmdptr, nlines))
break;
else {
inwait = 0;
return(0);
}
case '!': /* shell escape */
if (rmode) { /* restricted mode */
(void) pfmt(stderr, MM_ERROR, ":399:!command not allowed in restricted mode.\n");
break;
}
if (!hard_copy) { /* redisplay the command */
(void) fputs(cmdbuf,stdout);
(void) fputs("\n",stdout);
}
if ((id = fork ()) < 0) {
error(":400", "fork() failed, try again later");
break;
}
if (id == (pid_t)0) {
/*
* if stdin is a pipe, need to close it so
* that the terminal is really stdin for
* the command
*/
(void) fclose(stdin);
(void) dup(fileno(stdout));
(void) execl(shell, shell, "-c", cmdptr, 0);
(void) pfmt(stderr, MM_ERROR,
":278:Cannot execute %s: %s\n",
shell, strerror(errno));
exit(1);
}
(void) signal (SIGINT, SIG_IGN);
(void) signal (SIGQUIT, SIG_IGN);
if (catch_susp)
(void) signal(SIGTSTP, SIG_DFL);
while (wait((int *) 0) != id);
{
if (errno == ECHILD)
break;
else
errno = 0;
}
(void) fputs("!\n",stdout);
(void) fflush(stdout);
(void) signal(SIGINT,on_brk);
(void) signal(SIGQUIT,on_brk);
if (catch_susp)
(void) signal (SIGTSTP, onsusp);
break;
default:
BEEP();
break;
}
}
}
number()
{
register int i;
register char *p;
i = 0;
sign = 0;
p = cmdptr;
BLANKS(p);
if (*p == '+') {
p++;
sign = 1;
}
else
if (*p == '-') {
p++;
sign = -1;
}
while (isdigit(*p))
i = i * 10 + *p++ - '0';
cmdptr = p;
return(i);
}
ttyin ()
{
register char *sptr, *p;
wchar_t ch;
register int slash = 0;
int state = 0;
int width, length;
char multic[MB_LEN_MAX];
int readch();
fixterm();
(void) set_state(&state,' ',(char *)0); /* initialize state processing */
sptr = cmdbuf;
while(state != 10) {
if((length = mbftowc(multic, &ch, readch, &peekc)) < 0 ||
ch > 0177 && !wisprint(ch)) {
BEEP();
continue;
}
if (ch == '\n' && !slash)
break;
if (ch == erasechar() && !slash) {
if (sptr > cmdbuf) {
char *oldp = cmdbuf;
wchar_t wchar;
p = cmdbuf;
while(p < sptr) {
oldp = p;
p += mbtowc(&wchar, p, MB_LEN_MAX);
}
width = scrwidth(wchar);
if(!width)
/* ascii control character */
width = 2;
promptlen -= width;
while(width--)
(void) fputs("\b \b",stdout);
sptr = oldp;
}
(void) set_state(&state,ch,sptr);
(void) fflush(stdout);
continue;
}
else
if (ch == killchar() && !slash) {
if (hard_copy)
(void) putchar(ch);
resetterm();
return(1);
}
if (ch < ' ')
width = 2;
else
width = scrwidth(ch);
if (slash) {
slash = 0;
(void) fputs("\b \b",stdout);
sptr--;
promptlen--;
}
else /* is there room to keep this character? */
if (sptr>=cmdbuf + sizeof(cmdbuf) || promptlen + width >= columns) {
BEEP();
continue;
}
else
if (ch == '\\')
slash++;
if (set_state(&state,ch,sptr) == 0) {
BEEP();
continue;
}
strncpy(sptr, multic, length);
sptr += length;
if (ch < ' ') {
ch += 0100;
multic[0] = '^';
multic[1] = ch;
length = 2;
}
p = multic;
while(length--)
putchar(*p++);
promptlen += width;
(void) fflush(stdout);
}
*sptr = '\0';
kill_line();
(void) fflush(stdout);
resetterm();
return(0);
}
set_state(pstate,c,pc)
register int *pstate;
register wchar_t c;
register char *pc;
{
static char *psign;
static char *pnumber;
static char *pcommand;
static int slash;
if (*pstate == 0) {
psign = (char *)NULL;
pnumber = (char *)NULL;
pcommand = (char *)NULL;
*pstate = 1;
slash = 0;
return(1);
}
if (c == '\\' && !slash) {
slash++;
return(1);
}
if (c == erasechar() && !slash)
switch(*pstate) {
case 4:
if (pc > pcommand)
return(1);
pcommand = (char *)NULL;
case 3:
if (pnumber && pc > pnumber) {
*pstate = 3;
return(1);
}
pnumber = (char *)NULL;
case 2:
if (psign && pc > psign) {
*pstate = 2;
return(1);
}
psign = (char *)NULL;
case 1:
*pstate = 1;
return(1);
}
slash = 0;
switch(*pstate) {
case 1: /* before recieving anything interesting */
if (c == '\t' || (!nflag && c == ' '))
return(1);
if (c == '+' || c == '-') {
psign = pc;
*pstate = 2;
return(1);
}
case 2: /* recieved sign, waiting for digit */
if (c < 0177 && isdigit(c)) {
pnumber = pc;
*pstate = 3;
return(1);
}
case 3: /* recieved digit, waiting for the rest of the number */
if (c < 0177 && isdigit(c))
return(1);
if (c < 0177 && strchr("h\014.wz\004dqQfl np$",c)) {
pcommand = pc;
if (nflag)
*pstate = 10;
else
*pstate = 4;
return(1);
}
if (c < 0177 && strchr("s/^?!",c)) {
pcommand = pc;
*pstate = 4;
return(1);
}
return(0);
case 4:
return(1);
}
}
readch ()
{
unsigned char ch;
if(peekc) {
ch = peekc;
peekc = 0;
}
(void) read (fileno(stdout), (char*)&ch, 1);
return (ch);
}
help()
{
char *dashes = "-------------------------------------------------------\n";
if (clropt)
doclear();
(void) fputs(dashes, stdout);
(void) pfmt(stdout, MM_NOSTD, ":401: h help\n");
(void) pfmt(stdout, MM_NOSTD, ":402: q or Q quit\n");
(void) pfmt(stdout, MM_NOSTD, ":403: <blank> or <newline> next page\n");
(void) pfmt(stdout, MM_NOSTD, ":404: l next line\n");
(void) pfmt(stdout, MM_NOSTD, ":405: d or <^D> display half a page more\n");
(void) pfmt(stdout, MM_NOSTD, ":406: . or <^L> redisplay current page\n");
(void) pfmt(stdout, MM_NOSTD, ":407: f skip the next page forward\n");
(void) pfmt(stdout, MM_NOSTD, ":408: n next file\n");
(void) pfmt(stdout, MM_NOSTD, ":409: p previous file\n");
(void) pfmt(stdout, MM_NOSTD, ":410: $ last page\n");
(void) pfmt(stdout, MM_NOSTD, ":411: w or z set window size and display next page\n");
(void) pfmt(stdout, MM_NOSTD, ":412: s savefile save current file in savefile\n");
(void) pfmt(stdout, MM_NOSTD, ":413: /pattern/ search forward for pattern\n");
(void) pfmt(stdout, MM_NOSTD, ":414: ?pattern? or\n");
(void) pfmt(stdout, MM_NOSTD, ":415: ^pattern^ search backward for pattern\n");
(void) pfmt(stdout, MM_NOSTD, ":416: !command execute command\n");
(void) putc('\n', stdout);
(void) pfmt(stdout, MM_NOSTD, ":417:Most commands can be preceeded by a number, as in:\n");
(void) pfmt(stdout, MM_NOSTD, ":418:+1<newline> (next page,stdout); -1<newline> (previous page); 1<newline> (page 1).\n");
(void) putc('\n', stdout);
(void) pfmt(stdout, MM_NOSTD, ":419:See the manual page for more detail.\n");
(void) fputs(dashes, stdout);
}
/*
* Skip nskip files in the file list (from the command line). Nskip may be
* negative.
*/
int
skipf (nskip)
register int nskip;
{
if (fnum + nskip < 0) {
nskip = -fnum;
if (nskip == 0)
error(":420", "No previous file");
}
else
if (fnum + nskip > nfiles - 1) {
nskip = (nfiles - 1) - fnum;
if (nskip == 0)
error(":421", "No next file");
}
return(nskip);
}
/*
* Check whether the file named by fs is a file which the user may
* access. If it is, return the opened file. Otherwise return NULL.
*/
FILE *
checkf (fs)
register char *fs;
{
struct stat stbuf;
register FILE *f;
int fd;
int f_was_opened;
pipe_in = 0;
if (strcmp(fs,"-") == 0) {
if (tmp_fin == NULL)
f = stdin;
else {
rewind(tmp_fin);
f = tmp_fin;
}
f_was_opened = 0;
}
else {
if ((f=fopen(fs, "r")) == (FILE *)NULL) {
(void) fflush(stdout);
pfmt(stderr, MM_ERROR, ":4:Cannot open %s: %s\n", fs,
strerror(errno));
return ((FILE *)NULL);
}
f_was_opened = 1;
}
if (fstat(fileno(f), &stbuf) == -1) {
if(f_was_opened)
(void) fclose(f);
(void) fflush(stdout);
pfmt(stderr, MM_ERROR, ":5:Cannot access %s: %s\n", fs,
strerror(errno));
return ((FILE *)NULL);
}
if ((stbuf.st_mode & S_IFMT) == S_IFDIR) {
if (f_was_opened)
(void) fclose(f);
(void) pfmt(stderr, MM_ERROR, ":422:%s is a directory\n",fs);
return ((FILE *)NULL);
}
if ((stbuf.st_mode & S_IFMT) == S_IFREG) {
if (f == stdin) /* It may have been read from */
rewind(f); /* already, and not reopened */
}
else {
if (f != stdin) {
if (f_was_opened)
(void) fclose(f);
(void) pfmt(stderr, MM_ERROR, ":423:Special files only handled as standard input\n");
return((FILE *)NULL);
}
else {
(void) mktemp(tmp_name);
if ((fd=creat(tmp_name,(S_IRUSR|S_IWUSR))) < 0) {
(void) pfmt(stderr, MM_ERROR, ":424:Cannot create temp file: %s\n",
strerror(errno));
return((FILE *)NULL);
}
(void) close(fd);
if ((tmp_fou = fopen(tmp_name, "w")) == NULL) {
(void) pfmt(stderr, MM_ERROR,":425:Cannot get temp file for writing: %s\n",
strerror(errno));
return((FILE *)NULL);
}
if ((tmp_fin = fopen(tmp_name, "r")) == NULL) {
(void) pfmt(stderr, MM_ERROR, ":426:Cannot get temp file for reading: %s\n",
strerror(errno));
return((FILE *)NULL);
}
pipe_in = 1;
}
}
lineset(BOF);
return(f);
}
copy_file(f, out)
register FILE *f, *out;
{
register int c;
while ((c = getc(f)) != EOF)
(void) putc(c,out);
}
re_error(i)
int i;
{
int j;
static struct messages {
char *messageid;
char *message;
int number;
} re_errmsg[] = {
":427", "Pattern not found", 1,
":173", "Range endpoint too large", 11,
":177", "Bad number", 16,
":186", "`\\digit' out of range", 25,
":199", "No remembered search string", 41,
":200", "'\\( \\)' imbalance", 42,
":201", "Too many `\\(' s", 43,
":202", "More than two numbers given in '\\{ \\}'", 44,
":203", "'\\}' expected", 45,
":204", "First number exceeds second in '\\{ \\}'", 46,
":207", "'[ ]' imbalance", 49,
":208", "Regular expression overflow", 50,
":224", "Illegal byte sequence", 67,
":209", "Regular expression error", 0
};
for (j = 0; re_errmsg[j].number != 0; j++ )
if (re_errmsg[j].number == i )
break;
error(re_errmsg[j].messageid, re_errmsg[j].message);
longjmp(restore,1); /* restore to search() */
}
/*
* Search for nth ocurrence of regular expression contained in buf in the file
* negative n implies backward search
* n 'guaranteed' non-zero
*/
int
search (buf, n)
char buf[];
register int n;
{
register int direction;
static char *expbuf;
char *nexpbuf;
int END_COND;
if (setjmp(restore) == 0) {
nexpbuf = compile(buf,(char *)0,(char *)0);
if (regerrno) {
if (regerrno != 41 || expbuf == NULL)
re_error(regerrno);
} else {
if(expbuf)
free(expbuf);
expbuf = nexpbuf;
}
if (n < 0) { /* search back */
direction = -1;
(void) find(0,old_ss.first_line);
END_COND = BOF;
}
else {
direction = 1;
(void) find(0,old_ss.last_line);
END_COND = EOF;
}
while (find(1,direction) != END_COND){
if (brk_hit)
break;
if (step(Line,expbuf))
if ((n -= direction) == 0) {
switch(leave_search) {
case 't':
new_ss.first_line = find(1,0);
new_ss.last_line = new_ss.first_line + window - 1;
break;
case 'b':
new_ss.last_line = find(1,0);
new_ss.first_line = new_ss.last_line - window + 1;
break;
case 'm':
new_ss.first_line = find(1,0) - (window - 1)/2;
new_ss.last_line = new_ss.first_line + window - 1;
break;
}
return(1);
}
}
re_error(1); /* Pattern not found */
}
BEEP();
return(0);
}
/*
* find -- find line in file f, subject to certain constraints.
*
* This is the reason for all the funny stuff with sign and nlines.
* We need to be able to differentiate between relative and abosolute
* address specifications.
*
* So...there are basically three cases that this routine
* handles. Either line is zero, which means there is to be
* no motion (because line numbers start at one), or
* how and line specify a number, or line itself is negative,
* which is the same as having how == -1 and line == abs(line).
*
* Then, figure where exactly it is that we are going (an absolute
* line number). Find out if it is within what we have read,
* if so, go there without further ado. Otherwise, do some
* magic to get there, saving all the intervening lines,
* in case the user wants to see them some time later.
*
* In any case, return the line number that we end up at.
* (This is used by search() and screen()). If we go past EOF,
* return EOF.
* This EOF will go away eventually, as pg is expanded to
* handle multiple files as one huge one. Then EOF will
* mean we have run off the file list.
* If the requested line number is too far back, return BOF.
*/
find(how,line) /* find the line and seek there */
short how;
int line;
{
/* no compacted memory yet */
register FILE *f = in_file;
register long where;
if (how == 0)
where = line;
else
if (dot == zero - 1)
where = how * line;
else
where = how * line + dot->l_no;
/* now, where is either at, before, or after dol */
/* most likely case is after, so do it first */
eoflag = 0;
if (where >= dol->l_no) {
if (doliseof) {
dot = dol;
eoflag++;
return(EOF);
}
if (pipe_in)
in_file = f = stdin;
else
(void) fseek(f, dol->l_addr, 0);
dot = dol - 1;
while ((nchars = getline(f)) != EOF) {
dot++;
newdol(f);
if ( where == dot->l_no || brk_hit)
break;
}
if (nchars != EOF)
return(dot->l_no);
else { /* EOF */
dot = dol;
eoflag++;
doliseof++;
eofl_no = dol->l_no;
return(EOF);
}
}
else { /* where < dol->l_no */
if (pipe_in) {
(void) fflush(tmp_fou);
in_file = f = tmp_fin;
}
if (where < zero->l_no){
(void) fseek(f, zero->l_addr, 0);
dot = zero - 1;
return(BOF);
}
else {
dot = zero + where - 1;
(void) fseek(f, dot->l_addr, 0);
nchars = getline(f);
return(dot->l_no);
}
}
}
static FILE *fileptr;
static int (*rdchar)();
static int peekc2;
mrdchar()
{
int ch;
if(peekc2) {
ch = peekc2;
peekc2 = 0;
return(ch);
}
return rdchar(fileptr);
}
/*
* Get a logical line
*/
getline(f)
register FILE *f;
{
register char *p;
register int column;
static char multic[MB_LEN_MAX];
static int savlength = 0;
wchar_t c;
int length, width;
int fgetputc();
if (pipe_in && f == stdin)
rdchar = fgetputc;
else
rdchar = fgetc;
fileptr = f;
/* copy overlap from previous call to getline */
if(savlength > 0)
strncpy(Line, multic, savlength);
for (column = 0, p = Line + savlength; ;) {
if((length = mbftowc(multic, &c, mrdchar, &peekc2)) == 0) {
clearerr(f);
if (p > Line) { /* last line doesn't have '\n', */
*p++ = '\n';
*p = '\0'; /* print it any way */
return(column);
}
return(EOF);
}
if(length < 0) {
length = -length;
c = 0;
}
width = scrwidth(c);
if(column + width > columns && !fflag)
break;
if(p + length > &Line[LINSIZ - 2] && c != '\n')
break;
(void)strncpy(p, multic, length);
p += length;
column += width;
/* don't have any overlap here */
length = 0;
switch(c) {
case '\t': /* just a guess */
column = 1 + (column | 7);
break;
case '\b':
if (column > 0)
column--;
break;
case '\r':
column = 0;
break;
}
if (c == '\n')
break;
if (column >= columns && !fflag)
break;
}
if (c != '\n') { /* We're stopping in the middle of the line */
if (column != columns || !auto_right_margin)
*p++ = '\n'; /* for the display */
/* save overlap for next call to getline */
savlength = length;
if(savlength == 0) {
/* check if following byte is newline and get
it if it is */
c = fgetc(f);
if(c == '\n') {
/* gobble and copy (if necessary) newline */
(void) ungetc(c, f);
(void)(*rdchar)(f);
} else if (c == EOF)
clearerr(f);
else
(void) ungetc(c, f);
}
} else
savlength = 0;
*p = 0;
return(column);
}
save_input(f)
register FILE *f;
{
if (pipe_in) {
save_pipe();
in_file = tmp_fin;
pipe_in = 0;
}
(void) fseek(in_file,0L,0);
copy_file(in_file,f);
}
save_pipe()
{
if (!doliseof)
while (fgetputc(stdin) != EOF)
if (brk_hit) {
brk_hit = 0;
error(":428", "Piped input only partially saved");
break;
}
(void) fclose(tmp_fou);
}
fgetputc(f) /* copy anything read from a pipe to tmp_fou */
register FILE *f;
{
register int c;
if ((c = getc(f)) != EOF)
(void) putc(c,tmp_fou);
return(c);
}
lineset(how) /* initialize line memory */
int how;
{
if (zero == NULL) {
nlall = 128;
zero = (LINE *) malloc(nlall * sizeof (LINE));
}
dol = zero;
zero->l_no = 1;
zero->l_addr = 0L;
if (how == BOF) {
dot = zero - 1;
eoflag = 0;
doliseof = 0;
eofl_no = -1;
}
else {
dot = dol;
eoflag = 1;
doliseof = 1;
eofl_no = 1;
}
return;
}
newdol(f) /* add address of new 'dol' */
/* assumes that f is currently at beginning of said line */
/* updates dol */
register FILE *f;
{
register int diff;
if ((dol - zero) + 1 >= nlall){
LINE *ozero = zero;
nlall += 512;
if ((zero = (LINE *) realloc ((char *) zero,
(unsigned)(nlall * sizeof(LINE)))) == NULL){
zero = ozero;
compact();
}
diff = (char *)zero - (char *)ozero;
dot = (LINE *)((char *)dot + diff);
dol = (LINE *)((char *)dol + diff);
}
dol++;
if (!pipe_in)
dol->l_addr = ftell(f);
else {
(void) fflush(tmp_fou);
dol->l_addr = ftell(tmp_fou);
}
dol->l_no = (dol-1)->l_no + 1;
}
compact()
{
(void) pfmt(stderr, MM_ERROR, ":429:Out of memory - line %d\n",dol->l_no);
end_it();
}
terminit() /* set up terminal dependencies from termlib */
{
int err_ret;
struct termio ntty;
for (;;) {
register gid_t my_tgid;
my_tgid = (gid_t)tcgetpgrp(1);
if (my_tgid < (gid_t)0 || my_tgid == my_pgid)
break;
kill(-my_pgid, SIGTTOU);
}
if ((freopen("/dev/tty","r+",stdout)) == NULL) {
(void) pfmt(stderr, MM_ERROR, ":430:Cannot reopen stdout: %s\n",
strerror(errno));
exit(1);
}
(void) ioctl(fileno(stdout),TCGETA,&otty);
termflg = 1;
(void) setupterm(0,fileno(stdout),&err_ret);
(void) ioctl(fileno(stdout),TCGETA,&ntty);
ntty.c_lflag &= ~(ECHONL | ECHO | ICANON);
ntty.c_cc[VMIN] = 1;
ntty.c_cc[VTIME] = 1;
(void) ioctl(fileno(stdout),TCSETAW,&ntty);
saveterm();
resetterm();
if (lines <= 0 || hard_copy) {
hard_copy = 1;
lines = 24;
}
if (columns <= 0)
columns = 80;
if (clropt && !clear_screen)
clropt = 0;
if ((shell = getenv("SHELL")) == (char *)NULL)
shell = "/usr/bin/sh";
}
error(messid, mess, a1, a2, a3)
char *messid, *mess, *a1, *a2, *a3;
{
char buf[100];
(void)sprintf(buf, gettxt(messid, mess), a1, a2, a3);
kill_line();
sopr(NULL, buf,1);
prompt((char *) NULL);
errors++;
}
prompt(filename)
char *filename;
{
char outstr[PROMPTSIZE+6];
int pagenum;
if (filename != NULL) {
sopr(":431", "(Next file: ",1);
sopr(NULL, filename,1);
sopr(NULL, ")",1);
}
else {
if ((pagenum=(int)((new_ss.last_line-2)/(window-1)+1))
> 999999)
pagenum = 999999;
(void) sprintf(outstr,promptstr,pagenum);
sopr(NULL, outstr,1);
}
(void) fflush(stdout);
}
/*
* sopr puts out the message (please no \n's) surrounded by standout
* begins and ends
*/
sopr(mid, m,count)
char *mid, *m;
short count;
{
if (mid)
m = (char *)gettxt(mid, m);
if (count)
promptlen += strlen(m);
if (soflag && enter_standout_mode && exit_standout_mode) {
putp(enter_standout_mode);
(void) fputs(m,stdout);
putp(exit_standout_mode);
}
else
(void) fputs(m,stdout);
}
doclear()
{
if (clear_screen)
putp(clear_screen);
(void) putchar('\r'); /* this resets the terminal drivers character */
/* count in case it is trying to expand tabs */
}
kill_line()
{
erase_line(0);
if (!clr_eol) (void) putchar ('\r');
}
/* erase from after col to end of prompt */
erase_line(col)
register int col;
{
if (promptlen == 0)
return;
if (hard_copy)
(void) putchar('\n');
else {
if (col == 0)
(void) putchar('\r');
if (clr_eol) {
putp(clr_eol);
(void) putchar('\r'); /* for the terminal driver again */
}
else
for (col = promptlen - col; col > 0; col--)
(void) putchar (' ');
}
promptlen = 0;
}
/*
* Come here if a quit or interrupt signal is received
*/
void
on_brk(sno)
int sno; /* signal number generated */
{
(void) signal(sno, on_brk);
if (!inwait) {
BEEP();
brk_hit = 1;
}
else {
brk_hit = 0;
longjmp(restore,1);
}
}
/*
* Clean up terminal state and exit.
*/
void
end_it ()
{
if (out_is_tty) {
kill_line();
resetterm();
if (termflg)
(void) ioctl(fileno(stdout),TCSETAW,&otty);
}
if (tmp_fin)
(void) fclose(tmp_fin);
if (tmp_fou)
(void) fclose(tmp_fou);
if (tmp_fou || tmp_fin)
(void) unlink(tmp_name);
exit(status);
}
void
onsusp()
{
register ttou_is_dfl;
/* ignore SIGTTOU so following resetterm and flush works */
ttou_is_dfl = (signal (SIGTTOU, SIG_IGN) == SIG_DFL);
resetterm();
(void) fflush(stdout);
if (ttou_is_dfl)
(void) signal (SIGTTOU, SIG_DFL);
/* send SIGTSTP to stop this process group */
(void) signal (SIGTSTP, SIG_DFL);
kill (-my_pgid, SIGTSTP);
/* continued - reset the terminal */
(void) signal (SIGTSTP, (void (*)(int))onsusp);
resetterm();
if (inwait)
longjmp(restore,-1);
}
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