4.3BSD/usr/contrib/rn/art.c
/* $Header: art.c,v 4.3.1.5 85/09/10 11:07:18 lwall Exp $
*
* $Log: art.c,v $
* Revision 4.3.1.5 85/09/10 11:07:18 lwall
* %m not restored on some returns.
*
* Revision 4.3.1.4 85/05/23 12:13:31 lwall
* shouldn't display article that's really a subdirectory.
*
* Revision 4.3.1.3 85/05/13 09:29:55 lwall
* Added CUSTOMLINES option.
*
* Revision 4.3.1.2 85/05/10 13:46:07 lwall
* Fixed header reparse bug on backpage.
*
* Revision 4.3.1.1 85/05/10 11:30:56 lwall
* Branch for patches.
*
* Revision 4.3 85/05/01 11:34:51 lwall
* Baseline for release with 4.3bsd.
*
*/
#include "EXTERN.h"
#include "common.h"
#include "rn.h"
#include "ngstuff.h"
#include "head.h"
#include "cheat.h"
#include "help.h"
#include "search.h"
#include "artio.h"
#include "ng.h"
#include "bits.h"
#include "final.h"
#include "artstate.h"
#include "rcstuff.h"
#include "term.h"
#include "sw.h"
#include "util.h"
#include "backpage.h"
#include "intrp.h"
#include "INTERN.h"
#include "art.h"
/* page_switch() return values */
#define PS_NORM 0
#define PS_ASK 1
#define PS_RAISE 2
#define PS_TOEND 3
bool special = FALSE; /* is next page special length? */
int slines = 0; /* how long to make page when special */
ART_LINE highlight = -1; /* next line to be highlighted */
char *restart = Nullch; /* if nonzero, the place where last */
/* line left off on line split */
char *blinebeg; /* where in buffer current line began */
ART_POS alinebeg; /* where in file current line began */
#ifdef INNERSEARCH
ART_POS innersearch = 0; /* artpos of end of line we found */
/* for 'g' command */
ART_LINE isrchline = 0; /* last line to display */
bool hide_everything = FALSE;
/* if set, do not write page now, */
/* but refresh when done with page */
COMPEX gcompex; /* in article search pattern */
#endif
bool firstpage; /* is this the 1st page of article? */
char art_buf[LBUFLEN]; /* place for article lines */
void
art_init()
{
;
}
int
do_article()
{
register char *s;
ART_POS artsize; /* size in bytes of article */
bool hide_this_line = FALSE; /* hidden header line? */
ART_LINE linenum; /* line # on page, 1 origin */
#ifdef ULSMARTS
bool under_lining = FALSE;
/* are we underlining a word? */
#endif
register char *bufptr = art_buf;
/* pointer to input buffer */
register int outpos; /* column position of output */
static char prompt_buf[64]; /* place to hold prompt */
bool notesfiles = FALSE; /* might there be notesfiles junk? */
char oldmode = mode;
#ifdef INNERSEARCH
register int outputok;
#endif
if (fstat(artfp->_file,&filestat))
/* get article file stats */
return DA_CLEAN;
if (filestat.st_mode & S_IFMT != S_IFREG)
return DA_NORM;
artsize = filestat.st_size;
/* from that get article size */
sprintf(prompt_buf,
"%%sEnd of article %ld (of %ld)--what next? [%%s]",
(long)art,(long)lastart); /* format prompt string */
prompt = prompt_buf;
int_count = 0; /* interrupt count is 0 */
firstpage = (topline < 0);
for (;;) { /* for each page */
assert(art == openart);
if (do_fseek) {
#ifdef ASYNC_PARSE
parse_maybe(art); /* make sure header is ours */
#endif
artpos = vrdary(artline);
if (artpos < 0)
artpos = -artpos; /* labs(), anyone? */
if (firstpage)
artpos = (ART_POS)0;
fseek(artfp,artpos,0);
if (artpos < htype[PAST_HEADER].ht_minpos)
in_header = SOME_LINE;
do_fseek = FALSE;
restart = Nullch;
}
if (firstpage) {
if (firstline) {
interp(art_buf, (sizeof art_buf), firstline);
#ifdef CLEAREOL
maybe_eol(); /* PWP */
#endif CLEAREOL
fputs(art_buf,stdout) FLUSH;
artopen(art); /* rewind article in case interp */
/* forced a header parse */
}
else {
ART_NUM i;
#ifdef CLEAREOL
maybe_eol(); /* PWP */
#endif CLEAREOL
printf("Article %ld",(long)art);
i = (((ART_NUM)toread[ng]) - 1 + was_read(art));
#ifdef DELAYMARK
if (i || dmcount) {
printf(" (%ld more",(long)i);
if (dmcount)
printf(" + %ld Marked to return)",(long)dmcount);
putchar(')');
}
#else
if (i)
printf(" (%ld more)",(long)i);
#endif
if (htype[NGS_LINE].ht_flags & HT_HIDE)
printf(" in %s", ngname);
fputs(":\n",stdout) FLUSH;
}
start_header(art);
forcelast = FALSE; /* we will have our day in court */
restart = Nullch;
artline = 0; /* start counting lines */
artpos = 0;
vwtary(artline,artpos); /* remember pos in file */
}
for (linenum=(firstpage?2:1);
in_header || (
#ifdef INNERSEARCH
innersearch ? innermore() :
#endif
linenum<(firstpage?initlines:(special?slines:LINES)) );
linenum++) { /* for each line on page */
if (int_count) { /* exit via interrupt? */
putchar('\n') FLUSH; /* get to left margin */
int_count = 0; /* reset interrupt count */
mode = oldmode;
return DA_NORM; /* skip out of loops */
}
if (restart) { /* did not finish last line? */
bufptr = restart; /* then start again here */
restart = Nullch; /* and reset the flag */
}
else { /* not a restart */
if (fgets(art_buf,LBUFLEN,artfp)==Nullch) {
/* if all done */
mode = oldmode;
return DA_NORM; /* skip out of loops */
}
bufptr = art_buf; /* so start at beginning */
art_buf[LBUFLEN-1] = '\0';
/* make sure string ends */
}
blinebeg = bufptr; /* remember where we began */
alinebeg = artpos; /* both in buffer and file */
if (in_header && bufptr == art_buf)
hide_this_line =
parseline(art_buf,do_hiding,hide_this_line);
else if (notesfiles && do_hiding &&
bufptr == art_buf && *art_buf == '#' &&
isupper(art_buf[1]) && art_buf[2] == ':' ) {
fgets(art_buf,sizeof(art_buf),artfp);
if (index(art_buf,'!') != Nullch)
fgets(art_buf,sizeof(art_buf),artfp);
htype[PAST_HEADER].ht_minpos = ftell(artfp);
/* exclude notesfiles droppings */
hide_this_line = TRUE; /* and do not print either */
notesfiles = FALSE;
}
#ifdef CUSTOMLINES
if (hideline && bufptr == art_buf &&
execute(&hide_compex,art_buf) )
hide_this_line = TRUE;
#endif
if (in_header && htype[in_header].ht_flags & HT_MAGIC) {
if (in_header == NGS_LINE) {
hide_this_line = (index(art_buf,',') == Nullch);
}
else if (in_header == EXPIR_LINE) {
if (!(htype[EXPIR_LINE].ht_flags & HT_HIDE))
hide_this_line = (strlen(art_buf) < 10);
}
}
if (in_header == SUBJ_LINE &&
htype[SUBJ_LINE].ht_flags & HT_MAGIC) {
/* is this the subject? */
int length;
length = strlen(art_buf)-1;
artline++;
art_buf[length] = '\0'; /* wipe out newline */
#ifdef NOFIREWORKS
no_ulfire();
#endif
notesfiles =
(instr(&art_buf[length-10]," - (nf") != Nullch);
if (oldsubject) {
length += 7;
fputs("(SAME) ",stdout);
oldsubject = FALSE;
}
if (length+UG > COLS) { /* rarely true */
linenum++;
vwtary(artline,vrdary(artline-1)+COLS);
artline++;
}
s = art_buf + 8;
*s++ = '\0'; /* make into 2 strings */
#ifdef CLEAREOL
maybe_eol(); /* PWP */
#endif CLEAREOL
fputs(art_buf,stdout) FLUSH;
/* print up through : */
if (!UG)
putchar(' ');
underprint(s); /* print subject underlined */
putchar('\n') FLUSH; /* and finish the line */
}
else if (hide_this_line && do_hiding) {
/* do not print line? */
linenum--; /* compensate for linenum++ */
if (!in_header)
hide_this_line = FALSE;
}
else { /* just a normal line */
if (highlight==artline) { /* this line to be highlit? */
if (marking == STANDOUT) {
#ifdef NOFIREWORKS
if (erase_screen)
no_sofire();
#endif
standout();
}
else {
#ifdef NOFIREWORKS
if (erase_screen)
no_ulfire();
#endif
underline();
}
if (*bufptr == '\n')
putchar(' ');
}
#ifdef INNERSEARCH
outputok = !hide_everything;
/* get it into register, hopefully */
#endif
#ifdef CLEAREOL
#ifdef INNERSEARCH
if (outputok)
#endif
maybe_eol(); /* PWP */
#endif CLEAREOL
#ifdef CUSTOMLINES
if (pagestop && bufptr == art_buf &&
execute(&page_compex,art_buf) )
linenum = 32700;
#endif
for (outpos = 0; outpos < COLS; ) {
/* while line has room */
if (*bufptr >= ' ') { /* normal char? */
#ifdef ULSMARTS
if (*bufptr == '_') {
if (bufptr[1] == '\b') {
if (!under_lining && highlight!=artline
#ifdef INNERSEARCH
&& outputok
#endif
) {
under_lining++;
if (UG) {
if (bufptr != buf &&
bufptr[-1] == ' ') {
outpos--;
backspace();
}
}
underline();
}
bufptr += 2;
}
}
else {
if (under_lining) {
under_lining = 0;
un_underline();
if (UG) {
if (*bufptr == ' ')
goto skip_put;
outpos++;
}
}
}
#endif
#ifdef INNERSEARCH
if (outputok)
#endif
{
#ifdef ROTATION
if (rotate && !in_header
&& isalpha(*bufptr)) {
if ((*bufptr & 31) <= 13)
putchar(*bufptr+13);
else
putchar(*bufptr-13);
}
else
#endif
putchar(*bufptr);
}
if (*UC && ((highlight==artline && marking == 1)
#ifdef ULSMARTS
|| under_lining
#endif
)) {
backspace();
underchar();
}
skip_put:
bufptr++;
outpos++;
}
else if (*bufptr == '\n' || !*bufptr) {
/* newline? */
#ifdef ULSMARTS
if (under_lining) {
under_lining = 0;
un_underline();
}
#endif
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH && outpos < COLS - 6) {
standout();
printf("%4d",artline);
un_standout();
}
#endif
#ifdef INNERSEARCH
if (outputok)
#endif
putchar('\n') FLUSH;
restart = 0;
outpos = 1000; /* signal normal \n */
}
else if (*bufptr == '\t') { /* tab? */
#ifdef INNERSEARCH
if (outputok)
#endif
putchar(*bufptr);
bufptr++;
outpos += 8 - outpos % 8;
}
else if (*bufptr == '\f') { /* form feed? */
#ifdef INNERSEARCH
if (outputok)
#endif
fputs("^L",stdout);
if (bufptr == blinebeg && highlight != artline)
linenum = 32700;
/* how is that for a magic number? */
bufptr++;
outpos += 2;
}
else { /* other control char */
#ifdef INNERSEARCH
if (outputok)
#endif
{
putchar('^');
if (highlight == artline && *UC && marking == 1) {
backspace();
underchar();
putchar(*bufptr+64);
backspace();
underchar();
}
else
putchar(*bufptr+64);
}
bufptr++;
outpos += 2;
}
} /* end of column loop */
if (outpos < 1000) {/* did line overflow? */
restart = bufptr;
/* restart here next time */
if (AM) { /* automatic margins on tty? */
if (!XN && *bufptr == '\n')
/* need we simulate XN? */
restart = 0;
/* skip the newline */
}
else { /* cursor just hangs there */
#ifdef INNERSEARCH
if (outputok)
#endif
putchar('\n') FLUSH;
/* so move it down ourselves */
if (*bufptr == '\n')
restart = 0;
/* simulate XN if need be */
}
#ifdef CLEAREOL
/* #ifdef INNERSEARCH
if (outputok)
#endif
maybe_eol(); */ /* PWP *//* comment this out for now
until I am sure it is
needed*/
#endif CLEAREOL
}
/* handle normal end of output line formalities */
if (highlight == artline) {
/* were we highlighting line? */
if (marking == STANDOUT)
un_standout();
else
un_underline();
highlight = -1; /* no more we are */
}
artline++; /* count the line just printed */
if (artline - LINES + 1 > topline)
/* did we just scroll top line off? */
topline = artline - LINES + 1;
/* then recompute top line # */
}
/* determine actual position in file */
if (restart) /* stranded somewhere in the buffer? */
artpos += restart - blinebeg;
/* just calculate position */
else /* no, ftell will do */
artpos = ftell(artfp);
/* so do ftell */
vwtary(artline,artpos); /* remember pos in file */
} /* end of line loop */
#ifdef INNERSEARCH
innersearch = 0;
if (hide_everything) {
hide_everything = FALSE;
*buf = Ctl('l');
goto fake_command;
}
#endif
if (linenum >= 32700)/* did last line have formfeed? */
vwtary(artline-1,-vrdary(artline-1));
/* remember by negating pos in file */
special = FALSE; /* end of page, so reset page length */
firstpage = FALSE; /* and say it is not 1st time thru */
/* extra loop bombout */
if (artpos == artsize) {/* did we just now reach EOF? */
mode = oldmode;
return DA_NORM; /* avoid --MORE--(100%) */
}
/* not done with this article, so pretend we are a pager */
reask_pager:
unflush_output(); /* disable any ^O in effect */
standout(); /* enter standout mode */
printf("--MORE--(%ld%%)",(long)(artpos*100/artsize));
un_standout(); /* leave standout mode */
fflush(stdout);
/* reinp_pager: /* unused, commented for lint */
eat_typeahead();
#ifdef DEBUGGING
if (debug & DEB_CHECKPOINTING) {
printf("(%d %d %d)",checkcount,linenum,artline);
fflush(stdout);
}
#endif
if (checkcount >= docheckwhen &&
linenum == LINES &&
(artline > 40 || checkcount >= docheckwhen+10) ) {
/* while he is reading a whole page */
/* in an article he is interested in */
checkcount = 0;
checkpoint_rc(); /* update .newsrc */
}
collect_subjects(); /* loads subject cache until */
/* input is pending */
mode = 'p';
getcmd(buf);
if (errno) {
if (LINES < 100 && !int_count)
*buf = '\f';/* on CONT fake up refresh */
else {
*buf = 'q'; /* on INTR or paper just quit */
}
}
carriage_return();
#ifndef CLEAREOL
erase_eol(); /* and erase the prompt */
#else
if (erase_screen && can_home_clear) /* PWP was here */
clear_rest();
else
erase_eol(); /* and erase the prompt */
#endif CLEAREOL
fflush(stdout);
fake_command: /* used by innersearch */
/* parse and process pager command */
switch (page_switch()) {
case PS_ASK: /* reprompt "--MORE--..." */
goto reask_pager;
case PS_RAISE: /* reparse on article level */
mode = oldmode;
return DA_RAISE;
case PS_TOEND: /* fast pager loop exit */
mode = oldmode;
return DA_TOEND;
case PS_NORM: /* display more article */
break;
}
} /* end of page loop */
}
/* process pager commands */
int
page_switch()
{
register char *s;
switch (*buf) {
case 'd':
case Ctl('d'): /* half page */
special = TRUE;
slines = LINES / 2 + 1;
if (marking && *blinebeg != '\f'
#ifdef CUSTOMLINES
&& (!pagestop || blinebeg != art_buf ||
!execute(&page_compex,blinebeg))
#endif
) {
up_line();
highlight = --artline;
restart = blinebeg;
artpos = alinebeg;
}
return PS_NORM;
case '!': /* shell escape */
escapade();
return PS_ASK;
#ifdef INNERSEARCH
case Ctl('i'):
gline = 3;
sprintf(cmd_buf,"^[^%c]",*blinebeg);
compile(&gcompex,cmd_buf,TRUE,TRUE);
goto caseG;
case Ctl('g'):
gline = 3;
compile(&gcompex,"^Subject:",TRUE,TRUE);
goto caseG;
case 'g': /* in-article search */
if (!finish_command(FALSE))/* get rest of command */
return PS_ASK;
s = buf+1;
if (isspace(*s))
s++;
if ((s = compile(&gcompex,s,TRUE,TRUE)) != Nullch) {
/* compile regular expression */
printf("\n%s\n",s) FLUSH;
return PS_ASK;
}
carriage_return();
erase_eol(); /* erase the prompt */
/* FALL THROUGH */
caseG:
case 'G': {
/* ART_LINE lines_to_skip = 0; */
ART_POS start_where;
if (gline < 0 || gline > LINES-2)
gline = LINES-2;
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("Start here? %d >=? %d\n",topline + gline + 1,artline)
FLUSH;
#endif
if (*buf == Ctl('i') || topline+gline+1 >= artline)
start_where = artpos;
/* in case we had a line wrap */
else {
start_where = vrdary(topline+gline+1);
if (start_where < 0)
start_where = -start_where;
}
if (start_where < htype[PAST_HEADER].ht_minpos)
start_where = htype[PAST_HEADER].ht_minpos;
fseek(artfp,(long)start_where,0);
innersearch = 0; /* assume not found */
while (fgets(buf, sizeof buf, artfp) != Nullch) {
/* lines_to_skip++; NOT USED NOW */
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("Test %s",buf) FLUSH;
#endif
if (execute(&gcompex,buf) != Nullch) {
innersearch = ftell(artfp);
break;
}
}
if (!innersearch) {
fseek(artfp,artpos,0);
fputs("(Not found)",stdout) FLUSH;
return PS_ASK;
}
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("On page? %ld <=? %ld\n",(long)innersearch,(long)artpos)
FLUSH;
#endif
if (innersearch <= artpos) { /* already on page? */
if (innersearch < artpos) {
artline = topline+1;
while (vrdary(artline) < innersearch)
artline++;
}
highlight = artline - 1;
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("@ %d\n",highlight) FLUSH;
#endif
topline = highlight - gline;
if (topline < -1)
topline = -1;
*buf = '\f'; /* fake up a refresh */
innersearch = 0;
return page_switch();
}
else { /* who knows how many lines it is? */
do_fseek = TRUE;
hide_everything = TRUE;
}
return PS_NORM;
}
#else
case 'g': case 'G': case Ctl('g'):
notincl("g");
return PS_ASK;
#endif
case '\n': /* one line */
special = TRUE;
slines = 2;
return PS_NORM;
#ifdef ROTATION
case 'X':
rotate = !rotate;
/* FALL THROUGH */
#endif
case 'l':
case '\f': /* refresh screen */
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH) {
printf("Topline = %d",topline) FLUSH;
gets(buf);
}
#endif
clear();
do_fseek = TRUE;
artline = topline;
if (artline < 0)
artline = 0;
firstpage = (topline < 0);
return PS_NORM;
case 'b':
case '\b': /* I like backspace for this -- PWP */
/* Leaving it undocumented in case */
/* I want to steal the key--LAW */
case Ctl('b'): { /* back up a page */
ART_LINE target;
#ifndef CLEAREOL
clear();
#else
if (can_home_clear) /* if we can home do it -- PWP */
home_cursor();
else
clear();
#endif CLEAREOL
do_fseek = TRUE; /* reposition article file */
target = topline - (LINES - 2);
artline = topline;
do {
artline--;
} while (artline >= 0 && artline > target &&
vrdary(artline-1) >= 0);
topline = artline;
/* remember top line of screen */
/* (line # within article file) */
if (artline < 0)
artline = 0;
firstpage = (topline < 0);
return PS_NORM;
}
case 'h': { /* help */
int cmd;
if ((cmd = help_page()) > 0)
pushchar(cmd);
return PS_ASK;
}
case '\177':
case '\0': /* treat del,break as 'n' */
*buf = 'n';
/* FALL THROUGH */
case 'k': case 'K':
case 'n': case 'N': case Ctl('n'):
case 's': case 'S':
case 'u':
case 'w': case 'W':
case '|':
mark_as_read(art); /* mark article as read */
/* FALL THROUGH */
case '#':
case '$':
case '&':
case '-':
case '.':
case '/':
case '1': case '2': case '3': case '4': case '5':
case '6': case '7': case '8': case '9':
case '=':
case '?':
case 'c': case 'C':
case 'f': case 'F':
case 'j':
case Ctl('k'):
case 'm': case 'M':
case 'p': case 'P': case Ctl('p'):
case 'Q':
case 'r': case 'R': case Ctl('r'):
case 'v':
case 'Y':
#ifndef ROTATION
case 'x': case 'X':
#endif
case Ctl('x'):
case '^':
#ifdef ROTATION
rotate = FALSE;
#endif
reread = FALSE;
do_hiding = TRUE;
if (index("nNpP",*buf) == Nullch &&
index("wWsS!&|/?123456789.",*buf) != Nullch) {
setdfltcmd();
standout(); /* enter standout mode */
printf(prompt,mailcall,dfltcmd);
/* print prompt, whatever it is */
un_standout(); /* leave standout mode */
putchar(' ');
fflush(stdout);
}
return PS_RAISE; /* and pretend we were at end */
#ifdef ROTATION
case 'x':
rotate = TRUE;
/* FALL THROUGH */
#endif
case 'y':
case Ctl('v'): /* I like emacs -- PWP */
/* Leaving it undocumented in case */
/* I want to steal the key--LAW */
case ' ': /* continue current article */
if (erase_screen) { /* -e? */
#ifndef CLEAREOL
clear(); /* clear screen */
#else
if (can_home_clear) /* if we can home do it -- PWP */
home_cursor();
else
clear(); /* else clear screen */
#endif CLEAREOL
if (*blinebeg != '\f'
#ifdef CUSTOMLINES
&& (!pagestop || blinebeg != art_buf ||
!execute(&page_compex,blinebeg))
#endif
) {
restart = blinebeg;
artline--; /* restart this line */
artpos = alinebeg;
if (marking) /* and mark repeated line */
highlight = artline;
}
topline = artline;
/* and remember top line of screen */
/* (line # within article file) */
}
else if (marking && *blinebeg != '\f'
#ifdef CUSTOMLINES
&& (!pagestop || blinebeg != art_buf ||
!execute(&page_compex,blinebeg))
#endif
) {
/* are we marking repeats? */
up_line(); /* go up one line */
highlight = --artline;/* and get ready to highlight */
restart = blinebeg; /* the old line */
artpos = alinebeg;
}
return PS_NORM;
case 'q': /* quit this article? */
do_hiding = TRUE;
return PS_TOEND;
default:
fputs(hforhelp,stdout) FLUSH;
settle_down();
return PS_ASK;
}
}
#ifdef INNERSEARCH
bool
innermore()
{
if (artpos < innersearch) { /* not even on page yet? */
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("Not on page %ld < %ld\n",(long)artpos,(long)innersearch)
FLUSH;
#endif
return TRUE;
}
if (artpos == innersearch) { /* just got onto page? */
isrchline = artline; /* remember first line after */
highlight = artline - 1;
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("There it is %ld = %ld, %d @ %d\n",(long)artpos,
(long)innersearch,hide_everything,highlight) FLUSH;
#endif
if (hide_everything) { /* forced refresh? */
topline = highlight - gline;
if (topline < -1)
topline = -1;
return FALSE; /* let refresh do it all */
}
}
#ifdef DEBUGGING
if (debug & DEB_INNERSRCH)
printf("Not far enough? %d <? %d + %d\n",artline,isrchline,gline)
FLUSH;
#endif
if (artline < isrchline + gline) {
return TRUE;
}
return FALSE;
}
#endif