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Arquivotheca.SunOS-4.1.3/5bin/pg.c
seta75D 2e8a93c394 Init
2021-10-11 18:20:23 -03:00

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/* Copyright (c) 1984 AT&T */
/* All Rights Reserved */
/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
/* The copyright notice above does not evidence any */
/* actual or intended publication of such source code. */
#ifndef lint
static char sccsid[] = "@(#)pg.c 1.1 92/07/30 SMI"; /* from S5R3.1 1.17 */
#endif
#include <signal.h>
#include <setjmp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <locale.h>
#include <stdio.h>
#include <values.h>
#include <curses.h>
#include <term.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 */
*contig; /* where contiguous (non-aged) lines start */
short 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();
char *malloc(),
*realloc();
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 */
int 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 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 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 */
short 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];
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 */
#define USAGE() { (void) fprintf(stderr,"Usage: pg [-number] [-p string] [-cefns] [+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;
char *getenv();
FILE *checkf();
setlocale(LC_ALL, "");
nfiles = argc;
fnames = argv;
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 == '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) fprintf(stderr,"pg: 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);
if (out_is_tty) {
terminit();
(void) signal(SIGQUIT,on_brk);
(void) signal(SIGINT,on_brk);
}
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)
fnum++;
else {
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();
/* NOTREACHED */
}
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) fprintf(stderr,"pg: prompt too long\n");
exit(1);
/*NOTREACHED*/
}
/*
* 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("...skipping backward\n",0);
else
if (start > old_ss.last_line + 1)
sopr("...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("(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;
int waitid, 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; /*G.B.Green*/
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("cannot open save file");
break;
}
kill_line();
sopr("saving file ",1);
sopr(cmdptr,1);
(void) fflush(stdout);
save_input(sf);
error("saved");
}
(void) fclose(sf);
break;
case 'q':
case 'Q':
CHECKEND();
inwait = 0;
end_it();
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 (!hard_copy) { /* redisplay the command */
(void) fputs(cmdbuf,stdout);
(void) fputs("\n",stdout);
}
if ((id = fork ()) < 0) {
error("cannot fork, try again later");
break;
}
if (id == 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,
(char *)0);
(void) fprintf(stderr, "pg: ");
(void) perror(shell);
exit(1);
}
(void) signal (SIGINT, SIG_IGN);
(void) signal (SIGQUIT, SIG_IGN);
while ((waitid = wait ((int *) 0)) != -1 && waitid != id)
;
(void) fputs("!\n",stdout);
(void) fflush(stdout);
(void) signal(SIGINT,on_brk);
(void) signal(SIGQUIT,on_brk);
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;
register unsigned char ch;
register int slash = 0;
int state = 0;
fixterm();
(void) set_state(&state,' ',(char *)0); /* initialize state processing */
sptr = cmdbuf;
while(state != 10) {
ch = readch();
if ((ch == '\n' || ch == '\r') && !slash)
break;
if (ch == erasechar() && !slash) {
if (sptr > cmdbuf) {
--promptlen;
(void) fputs("\b \b",stdout);
--sptr;
if (*sptr < ' ') {
--promptlen;
(void) fputs("\b \b",stdout);
}
}
(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 (slash) {
slash = 0;
(void) fputs("\b \b",stdout);
sptr--;
promptlen--;
}
else /* is there room to keep this character? */
if (sptr>=cmdbuf + sizeof(cmdbuf) || promptlen + 2 >= columns) {
BEEP();
continue;
}
else
if (ch == '\\')
slash++;
if (set_state(&state,(int)ch,sptr) == 0) {
BEEP();
continue;
}
*sptr++ = ch;
if (ch < ' ') {
ch += 0100;
(void) putchar('^');
promptlen++;
}
(void) putchar(ch);
promptlen++;
(void) fflush(stdout);
}
*sptr = '\0';
kill_line();
(void) fflush(stdout);
resetterm();
return(0);
}
set_state(pstate,c,pc)
register int *pstate;
register int 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 (isdigit(c)) {
pnumber = pc;
*pstate = 3;
return(1);
}
case 3: /* recieved digit, waiting for the rest of the number */
if (isdigit(c))
return(1);
if (strchr("h\014.wz\004dqQfl np$",c)) {
pcommand = pc;
if (nflag)
*pstate = 10;
else
*pstate = 4;
return(1);
}
if (strchr("s/^?!",c)) {
pcommand = pc;
*pstate = 4;
return(1);
}
return(0);
case 4:
return(1);
}
/*NOTREACHED*/
}
readch ()
{
char ch;
(void) read (fileno(stdout), &ch, 1);
return (ch);
}
help()
{
if (clropt)
doclear();
(void) fputs("-------------------------------------------------------\n",stdout);
(void) fputs(" h help\n",stdout);
(void) fputs(" q or Q quit\n",stdout);
(void) fputs(" <blank> or \\n next page\n",stdout);
(void) fputs(" l next line\n",stdout);
(void) fputs(" d or ^D display half a page more\n",stdout);
(void) fputs(" . or ^L redisplay current page\n",stdout);
(void) fputs(" f skip the next page forward\n",stdout);
(void) fputs(" n next file\n",stdout);
(void) fputs(" p previous file\n",stdout);
(void) fputs(" $ last page\n",stdout);
(void) fputs(" w or z set window size and display next page\n",stdout);
(void) fputs(" s savefile save current file in savefile\n",stdout);
(void) fputs(" /pattern/ search forward for pattern\n",stdout);
(void) fputs(" ?pattern? or\n",stdout);
(void) fputs(" ^pattern^ search backward for pattern\n",stdout);
(void) fputs(" !command execute command\n",stdout);
(void) fputs("\n",stdout);
(void) fputs("Most commands can be preceeded by a number, as in:\n",stdout);
(void) fputs("+1\\n (next page,stdout); -1\\n (previous page); 1\\n (page 1).\n",stdout);
(void) fputs("\n",stdout);
(void) fputs("See the manual page for more detail.\n",stdout);
(void) fputs("-------------------------------------------------------\n",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("No previous file");
}
else
if (fnum + nskip > nfiles - 1) {
nskip = (nfiles - 1) - fnum;
if (nskip == 0)
error("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);
(void) fprintf(stderr, "pg: ");
perror(fs);
return ((FILE *)NULL);
}
f_was_opened = 1;
}
if (fstat(fileno(f), &stbuf) == -1) {
if (f_was_opened)
(void) fclose(f);
(void) fflush(stdout);
(void) fprintf(stderr, "pg: Can't stat ");
perror(fs);
return ((FILE *)NULL);
}
if ((stbuf.st_mode & S_IFMT) == S_IFDIR) {
if (f_was_opened)
(void) fclose(f);
(void) fprintf(stderr,"pg: %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) fprintf(stderr,"pg: special files only handled as standard input\n");
return((FILE *)NULL);
}
else {
(void) mktemp(tmp_name);
if ((fd=creat(tmp_name,0600)) < 0) {
perror("pg: Can't create temp file");
return((FILE *)NULL);
}
(void) close(fd);
if ((tmp_fou = fopen(tmp_name, "w")) == NULL) {
perror("pg: Can't get temp file for writing");
return((FILE *)NULL);
}
if ((tmp_fin = fopen(tmp_name, "r")) == NULL) {
perror("pg: Can't get temp file for reading");
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);
}
#define INIT register char *sp = instring;
#define GETC() (unsigned char)(*sp++)
#define PEEKC() (unsigned char)(*sp)
#define UNGETC(x) (--sp)
#define RETURN(c) return
#define ERROR(c) re_error(c)
#include <regexp.h>
re_error(i)
int i;
{
int j;
static struct messages {
char *message;
int number;
} re_errmsg[] = {
"Pattern not found", 1,
"Range endpoint too large", 11,
"Bad number", 16,
"`\\digit' out of range", 25,
"Illegal or missing delimeter", 36,
"No remembered search string", 41,
"\\( \\) imbalance", 42,
"Too many \\(", 43,
"More than two numbers given in \\{ \\}", 44,
"} expected after \\", 45,
"First number exceeds second in \\{ \\}", 46,
"[] imbalance", 49,
"Regular expression too long", 50,
"Bad regular expression", 0
};
for (j = 0; re_errmsg[j].number != 0; j++ )
if (re_errmsg[j].number == i )
break;
error(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
*/
char expbuf[BUFSIZ];
int
search (buf, n)
char buf[];
register int n;
{
register int direction;
char *endbuf;
int END_COND;
endbuf = buf + strlen(buf)-2;
if(*endbuf++ != '\\' && *endbuf == '$') {
*endbuf++ = '\\';
*endbuf++ = 'n';
*endbuf = '\0';
}
if (setjmp(restore) == 0) {
compile(buf,expbuf,expbuf+BUFSIZ,NULL);
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;
short line;
{
/* no compacted memory yet */
register FILE *f = in_file;
register short 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);
}
}
}
/*
* Get a logical line
*/
getline(f)
register FILE *f;
{
register int c;
register char *p;
register int column;
register int i;
register int (*rdchar)();
int fgetc();
int fgetputc();
if (pipe_in && f == stdin)
rdchar = fgetputc;
else
rdchar = fgetc;
for (i = 1, column = 0, p = Line; i < LINSIZ - 1; i++, p++) {
c = (*rdchar)(f);
*p = c;
switch(c) {
case EOF:
clearerr(f);
if (p > Line) { /* last line doesn't have '\n', */
*p++ = '\n';
*p = '\0'; /* print it any way */
return(column);
}
return(EOF);
case '\n':
break;
case '\t': /* just a guess */
column = 1 + (column | 7);
break;
case '\b':
if (column > 0)
column--;
break;
case '\r':
column = 0;
break;
default:
if (isprint(c))
column++;
break;
}
if (c == '\n') {
p++;
break;
}
if (column >= columns && !fflag) {
p++;
break;
}
}
if (c != '\n') { /* We're stopping in the middle of the line */
if (column != columns || !auto_right_margin)
*p++ = '\n'; /* for the display */
/* peek at the next character */
c = fgetc(f);
if (c == '\n') {
(void) ungetc(c,f);
c = (*rdchar)(f); /* gobble and copy it */
}
else
if (c == EOF) /* get it next time */
clearerr(f);
else
(void) ungetc(c,f);
}
*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("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 = contig = 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;
free ((char *) zero);
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);
contig = (LINE *)((char *)contig + 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) fprintf(stderr, "pg: no more memory - line %d\n",dol->l_no);
end_it();
}
terminit() /* set up terminal dependencies from termlib */
{
int err_ret;
struct termio ntty;
if ((freopen("/dev/tty","r+",stdout)) == NULL) {
(void) fprintf(stderr,"pg: cannot reopen stdout\n");
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 = "/bin/sh";
}
error(mess)
char *mess;
{
kill_line();
sopr(mess,1);
prompt((char *) NULL);
errors++;
}
prompt(filename)
char *filename;
{
char outstr[PROMPTSIZE+6];
int pagenum;
if (filename != NULL) {
sopr("(Next file: ",1);
sopr(filename,1);
sopr(")",1);
}
else {
if ((pagenum=(int)((new_ss.last_line-2)/(window-1)+1))
> MAXINT)
pagenum = MAXINT;
(void) sprintf(outstr,promptstr,pagenum);
sopr(outstr,1);
}
(void) fflush(stdout);
}
/*
* sopr puts out the message (please no \n's) surrounded by standout
* begins and ends
*/
sopr(m,count)
char *m;
short count;
{
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
*/
int
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.
*/
int
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(0);
/* NOTREACHED */
}
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