Minix1.5/commands/nroff/escape.c
/*
* escape.c - Escape and special character input processing portion of
* nroff word processor
*
* adapted for atariST/TOS by Bill Rosenkranz 11/89
* net: rosenkra@hall.cray.com
* CIS: 71460,17
* GENIE: W.ROSENKRANZ
*
* original author:
*
* Stephen L. Browning
* 5723 North Parker Avenue
* Indianapolis, Indiana 46220
*
* history:
*
* - Originally written in BDS C;
* - Adapted for standard C by W. N. Paul
* - Heavily hacked up to conform to "real" nroff by Bill Rosenkranz
*/
#undef NRO_MAIN /* extern globals */
#include <stdio.h>
#include "nroff.h"
/*------------------------------*/
/* expesc */
/*------------------------------*/
expesc (p, q)
char *p;
char *q;
{
/*
* Expand escape sequences
*/
register char *s;
register char *t;
register char *pstr;
register int i;
register int val;
register int autoinc;
char c;
char fs[5]; /* for font change */
char nrstr[20];
char fmt[20];
char name[10];
int nreg;
char *pfs;
int inc;
int tmp;
char delim;
s = p;
t = q;
/*
* if escape parsing is not on, just copy string
*/
if (dc.escon == NO)
{
while (*s != EOS)
{
*t++ = *s++;
}
*t = EOS;
strcpy (p, q);
return;
}
/*
* do it...
*/
while (*s != EOS)
{
if (*s != dc.escchr)
{
/*
* not esc, continue...
*/
*t++ = *s++;
}
else if (*(s + 1) == dc.escchr)
{
/*
* \\ escape escape
*/
*t++ = *s++;
++s;
}
else if (*(s + 1) == 'n')
{
/*
* \nx, \n(xx register
*
* first check for \n+... or \n-... (either form)
*/
s += 2;
autoinc = 0;
if (*s == '+')
{
autoinc = 1;
s += 1;
}
if (*s == '-')
{
autoinc = -1;
s += 1;
}
/*
* was this \nx or \n(xx form?
*/
if (isalpha (*s))
{
/*
* \nx form. find reg (a-z)
*/
nreg = tolower (*s) - 'a';
/*
* was this \n+x or \n-x? if so, do the
* auto incr
*/
if (autoinc > 0)
dc.nr[nreg] += dc.nrauto[nreg];
else if (autoinc < 0)
dc.nr[nreg] -= dc.nrauto[nreg];
/*
* display format
*/
if (dc.nrfmt[nreg] == '1')
{
/*
* normal decimal digits
*/
t += itoda (dc.nr[nreg], t, 6) - 1;
}
else if (dc.nrfmt[nreg] == 'i')
{
/*
* lower roman
*/
t += itoroman (dc.nr[nreg], t, 24) - 1;
}
else if (dc.nrfmt[nreg] == 'I')
{
/*
* upper roman
*/
t += itoROMAN (dc.nr[nreg], t, 24) - 1;
}
else if (dc.nrfmt[nreg] == 'a')
{
/*
* lower letters
*/
t += itoletter (dc.nr[nreg], t, 12) - 1;
}
else if (dc.nrfmt[nreg] == 'A')
{
/*
* upper letters
*/
t += itoLETTER (dc.nr[nreg], t, 12) - 1;
}
else if (dc.nrfmt[nreg] & 0x80)
{
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld",
(int)(dc.nrfmt[nreg] & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) dc.nr[nreg]);
tmp = dc.nrfmt[nreg] & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
}
else
{
/*
* normal (default)
*/
t += itoda (dc.nr[nreg], t, 6) - 1;
}
++s;
}
else if (*s == '%')
{
/*
* \n% form. find index into reg struct
*/
nreg = findreg ("%");
if (nreg < 0)
{
fprintf (err_stream,
"***%s: no register match\n",
myname);
err_exit (-1);
}
/*
* was this \n+% or \n-%? if so, do the
* auto incr
*/
if (autoinc > 0)
rg[nreg].rval += rg[nreg].rauto;
else if (autoinc < 0)
rg[nreg].rval -= rg[nreg].rauto;
/*
* display format
*/
if (rg[nreg].rfmt == '1')
{
/*
* normal decimal digits
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
else if (rg[nreg].rfmt == 'i')
{
/*
* lower roman
*/
t += itoroman (rg[nreg].rval, t, 24) - 1;
}
else if (rg[nreg].rfmt == 'I')
{
/*
* upper roman
*/
t += itoROMAN (rg[nreg].rval, t, 24) - 1;
}
else if (rg[nreg].rfmt == 'a')
{
/*
* lower letters
*/
t += itoletter (rg[nreg].rval, t, 12) - 1;
}
else if (rg[nreg].rfmt == 'A')
{
/*
* upper letters
*/
t += itoLETTER (rg[nreg].rval, t, 12) - 1;
}
else if (rg[nreg].rfmt & 0x80)
{
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld",
(int)(rg[nreg].rfmt & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) rg[nreg].rval);
tmp = rg[nreg].rfmt & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
}
else
{
/*
* normal (default)
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
s += 1;
}
else if (*s == '(')
{
/*
* \n(xx form. find index into reg struct
*/
s += 1;
name[0] = *s;
name[1] = *(s + 1);
if (name[1] == ' ' || name[1] == '\t'
|| name[1] == '\n' || name[1] == '\r')
name[1] = '\0';
name[2] = '\0';
nreg = findreg (name);
if (nreg < 0)
{
fprintf (err_stream,
"***%s: no register match\n",
myname);
err_exit (-1);
}
/*
* was this \n+(xx or \n-(xx? if so, do the
* auto incr
*/
if (rg[nreg].rflag & RF_WRITE)
{
if (autoinc > 0)
rg[nreg].rval += rg[nreg].rauto;
else if (autoinc < 0)
rg[nreg].rval -= rg[nreg].rauto;
}
/*
* display format
*/
if (rg[nreg].rfmt == '1')
{
/*
* normal decimal digits
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
else if (rg[nreg].rfmt == 'i')
{
/*
* lower roman
*/
t += itoroman (rg[nreg].rval, t, 24) - 1;
}
else if (rg[nreg].rfmt == 'I')
{
/*
* upper roman
*/
t += itoROMAN (rg[nreg].rval, t, 24) - 1;
}
else if (rg[nreg].rfmt == 'a')
{
/*
* lower letters
*/
t += itoletter (rg[nreg].rval, t, 12) - 1;
}
else if (rg[nreg].rfmt == 'A')
{
/*
* upper letters
*/
t += itoLETTER (rg[nreg].rval, t, 12) - 1;
}
else if (rg[nreg].rfmt & 0x80)
{
/*
* zero-filled decimal
*/
sprintf (fmt, "%%0%dld",
(int)(rg[nreg].rfmt & 0x7F));
fmt[5] = '\0';
sprintf (nrstr, fmt, (long) rg[nreg].rval);
tmp = rg[nreg].rfmt & 0x7F;
nrstr[tmp] = '\0';
strcpy (t, nrstr);
t += strlen (nrstr);
}
else
{
/*
* normal (default)
*/
t += itoda (rg[nreg].rval, t, 6) - 1;
}
s += 2;
}
}
else if (*(s + 1) == '\"')
{
/*
* \" comment
*/
*s = EOS;
*t = *s;
return;
}
else if (*(s + 1) == '*')
{
/*
* \*x, \*(xx string
*/
s += 2;
if (*s == '(')
{
/*
* \*(xx form
*/
s += 1;
name[0] = *s;
name[1] = *(s + 1);
name[2] = '\0';
pstr = getstr (name);
if (!pstr)
{
fprintf (err_stream,
"***%s: string not found\n",
myname);
err_exit (-1);
}
while (*pstr)
*t++ = *pstr++;
s += 2;
}
else
{
/*
* \*x form
*/
name[0] = *s;
name[1] = '\0';
pstr = getstr (name);
if (!pstr)
{
fprintf (err_stream,
"***%s: string not found\n",
myname);
err_exit (-1);
}
while (*pstr)
*t++ = *pstr++;
s += 1;
}
}
else if (*(s + 1) == 'f')
{
/*
* \fx font
*/
s += 2;
pfs = fs; /* set up ret string */
fs[0] = '\0';
/*
* it parses 1-2 char of s and returns esc seq for
* \fB and \fR (\fI is same as \fB)
*/
fontchange (*s, pfs);
/*
* imbed the atari (vt52) escape seq
*/
while (*pfs)
*t++ = *pfs++;
++s; /* skip B,I,R,S,P */
}
else if (*(s + 1) == '(')
{
/*
* \(xx special char
*/
s += 2;
/*
* it returns num char to skip and sets c to
* the ascii value of the char
*/
inc = specialchar (s, &c);
/*
* skip proper num char in s and add c to target
*/
if (inc)
{
s += inc;
*t++ = c;
}
}
else if (*(s + 1) == 'e')
{
/*
* \e printable version of escape
*/
*t++ = dc.escchr;
s += 2;
}
else if (*(s + 1) == '`')
{
/*
* \` grave, like \(ga
*/
*t++ = 0x60;
s += 2;
}
else if (*(s + 1) == '\'')
{
/*
* \' accute, like \(aa
*/
s += 2;
*t++ = 0xBA;
}
else if (*(s + 1) == '-')
{
/*
* \- minus
*/
s += 2;
*t++ = 0x2D;
}
else if (*(s + 1) == '.')
{
/*
* \. period
*/
s += 2;
*t++ = 0x2E;
}
else if (*(s + 1) == ' ')
{
/*
* \(space) space
*/
s += 2;
*t++ = 0x20;
}
else if (*(s + 1) == '0')
{
/*
* \0 digital width space
*/
s += 2;
*t++ = 0x20;
}
else if (*(s + 1) == '|')
{
/*
* \| narrow width char (0 in nroff)
*/
s += 2;
}
else if (*(s + 1) == '^')
{
/*
* \^ narrow width char (0 in nroff)
*/
s += 2;
}
else if (*(s + 1) == '&')
{
/*
* \& non-printing zero width
*/
s += 2;
}
else if (*(s + 1) == '!')
{
/*
* \! transparent copy line
*/
s += 2;
}
else if (*(s + 1) == '$')
{
/*
* \$N interpolate arg 1<=N<=9
*/
s += 2;
}
else if (*(s + 1) == '%')
{
/*
* \% hyphen
*/
s += 2;
*t++ = 0x2D;
*t++ = 0x2D;
}
else if (*(s + 1) == 'a')
{
/*
* \a
*/
s += 2;
}
else if (*(s + 1) == 'b')
{
/*
* \b'abc...'
*/
s += 2;
}
else if (*(s + 1) == 'c')
{
/*
* \c
*/
s += 2;
}
else if (*(s + 1) == 'd')
{
/*
* \d
*/
s += 2;
}
else if (*(s + 1) == 'h')
{
/*
* \h'N' horiz motion
*/
s += 2;
delim = *s++;
val = atoi (s);
for (i = 0; i < val; i++)
*t++ = ' ';
while (*s != delim)
{
if (*s == 0)
break;
s++;
}
if (*s)
s++;
}
else if (*(s + 1) == 'k')
{
/*
* \kx
*/
s += 2;
}
else if (*(s + 1) == 'l')
{
/*
* \l'Nc'
*/
s += 2;
}
else if (*(s + 1) == 'L')
{
/*
* \L'Nc'
*/
s += 2;
}
else if (*(s + 1) == 'o')
{
/*
* \o'abc...' overstrike
*/
s += 2;
delim = *s++;
while (*s != EOS && *s != delim)
{
*t++ = *s++;
*t++ = 0x08;
}
s++;
}
else if (*(s + 1) == 'p')
{
/*
* \p
*/
s += 2;
}
else if (*(s + 1) == 'r')
{
/*
* \r
*/
s += 2;
}
else if (*(s + 1) == 's')
{
/*
* \sN,\s+-N
*/
s += 2;
}
else if (*(s + 1) == 't')
{
/*
* \t horizontal tab
*/
s += 2;
*t++ = 0x09;
}
else if (*(s + 1) == 'u')
{
/*
* \u
*/
s += 2;
}
else if (*(s + 1) == 'v')
{
/*
* \v'N' vert tab
*/
s += 2;
delim = *s++;
val = atoi (s);
for (i = 0; i < val; i++)
*t++ = 0x0A;
while (*s != delim)
{
if (*s == 0)
break;
s++;
}
if (*s)
s++;
}
else if (*(s + 1) == 'w')
{
/*
* \w'str'
*/
s += 2;
}
else if (*(s + 1) == 'x')
{
/*
* \x'N'
*/
s += 2;
}
else if (*(s + 1) == 'z')
{
/*
* \zc print c w/o spacing
*/
s += 2;
*t++ = *s++;
*t++ = 0x08;
}
else if (*(s + 1) == '{')
{
/*
* \{
*/
s += 2;
}
else if (*(s + 1) == '}')
{
/*
* \}
*/
s += 2;
}
else if (*(s + 1) == '\n' || *(s + 1) == '\r')
{
/*
* \(newline) ignore newline
*/
s += 2;
}
else
{
/*
* \X any other character not above
*/
s += 1;
*t++ = *s++;
}
}
/*
* end the string and return it in original buf
*/
*t = EOS;
strcpy (p, q);
}
/*------------------------------*/
/* specialchar */
/*------------------------------*/
specialchar (s, c)
register char *s;
register char *c;
{
/*
* handles \(xx escape sequences for special characters (atari-specific)
*/
register char c1;
register char c2;
c1 = *s;
c2 = *(s+1);
/*
* symbols
*/
if (c1 == 'c' && c2 == 'o') {*c = 0xBD; return (2);} /* copyrite */
if (c1 == 'r' && c2 == 'g') {*c = 0xBE; return (2);} /* registered */
if (c1 == 't' && c2 == 'm') {*c = 0xBF; return (2);} /* trademark */
if (c1 == '1' && c2 == '2') {*c = 0xAB; return (2);} /* 1/2 */
if (c1 == '1' && c2 == '4') {*c = 0xAC; return (2);} /* 1/4 */
if (c1 == 'p' && c2 == '2') {*c = 0xFD; return (2);} /* ^2 */
if (c1 == 'p' && c2 == '3') {*c = 0xFE; return (2);} /* ^3 */
if (c1 == 'p' && c2 == 'n') {*c = 0xFC; return (2);} /* ^n */
if (c1 == 'a' && c2 == 'a') {*c = 0xBA; return (2);} /* acute */
if (c1 == 'g' && c2 == 'a') {*c = 0x60; return (2);} /* grave */
if (c1 == 'd' && c2 == 'e') {*c = 0xF8; return (2);} /* degree */
if (c1 == 'd' && c2 == 'g') {*c = 0xBB; return (2);} /* dagger */
if (c1 == 'c' && c2 == 't') {*c = 0x9B; return (2);} /* cent */
if (c1 == 'b' && c2 == 'u') {*c = 0xF9; return (2);} /* bullet */
if (c1 == 'd' && c2 == 't') {*c = 0xFA; return (2);} /* dot */
if (c1 == 'p' && c2 == 'p') {*c = 0xBC; return (2);} /* paragraph */
if (c1 == '^' && c2 == 'g') {*c = 0x07; return (2);} /* ring bell */
if (c1 == 'u' && c2 == 'a') {*c = 0x01; return (2);} /* up arrow */
if (c1 == 'd' && c2 == 'a') {*c = 0x02; return (2);} /* dn arrow */
if (c1 == '-' && c2 == '>') {*c = 0x03; return (2);} /* rt arrow */
if (c1 == '<' && c2 == '-') {*c = 0x04; return (2);} /* lf arrow */
if (c1 == 'd' && c2 == 'i') {*c = 0xF6; return (2);} /* divide */
if (c1 == 's' && c2 == 'r') {*c = 0xFB; return (2);} /* sq root */
if (c1 == '=' && c2 == '=') {*c = 0xF0; return (2);} /* == */
if (c1 == '>' && c2 == '=') {*c = 0xF2; return (2);} /* >= */
if (c1 == '<' && c2 == '=') {*c = 0xF3; return (2);} /* <= */
if (c1 == '+' && c2 == '-') {*c = 0xF1; return (2);} /* +- */
if (c1 == '~' && c2 == '=') {*c = 0xF7; return (2);} /* ~= */
if (c1 == 'a' && c2 == 'p') {*c = 0x7E; return (2);} /* approx */
if (c1 == 'n' && c2 == 'o') {*c = 0xAA; return (2);} /* not */
if (c1 == 'm' && c2 == 'o') {*c = 0xEE; return (2);} /* member */
if (c1 == 'c' && c2 == 'a') {*c = 0xEF; return (2);} /* intersect */
if (c1 == 'c' && c2 == 'u') {*c = 0x55; return (2);} /* union */
if (c1 == 'i' && c2 == '1') {*c = 0xF4; return (2);} /* integral1 */
if (c1 == 'i' && c2 == '2') {*c = 0xF5; return (2);} /* integral2 */
/*
* greek
*/
if (c1 == '*' && c2 == 'a') {*c = 0xE0; return (2);} /* alpha */
if (c1 == '*' && c2 == 'b') {*c = 0xE1; return (2);} /* beta */
if (c1 == '*' && c2 == 'g') {*c = 0xE2; return (2);} /* gamma */
if (c1 == '*' && c2 == 'd') {*c = 0x7F; return (2);} /* delta */
if (c1 == '*' && c2 == 's') {*c = 0xE4; return (2);} /* sigma */
if (c1 == '*' && c2 == 'p') {*c = 0xE3; return (2);} /* pi */
if (c1 == '*' && c2 == 'm') {*c = 0xE6; return (2);} /* mu */
*c = ' ';
return (0);
}
/*------------------------------*/
/* fontchange */
/*------------------------------*/
fontchange (fnt, s)
char fnt;
char *s;
{
/*
* handles \fx font change escapes for R,B,I,S,P (atari-specific)
* resets current and last font in dc struct (last used for .ft
* with no args)
*/
int tmp;
*s = '\0';
switch (fnt)
{
case 'R': /* Times Roman */
if (dc.dofnt == YES)
{
if (dc.thisfnt == 2)
strcpy (s, e_italic);
else if (dc.thisfnt == 3)
strcpy (s, e_bold);
}
dc.lastfnt = dc.thisfnt;
dc.thisfnt = 1;
break;
case 'I': /* Times italic */
if (dc.dofnt == YES)
strcpy (s, s_italic);
dc.lastfnt = dc.thisfnt;
dc.thisfnt = 2;
break;
case 'B': /* Times bold */
if (dc.dofnt == YES)
strcpy (s, s_bold);
dc.lastfnt = dc.thisfnt;
dc.thisfnt = 3;
break;
case 'S': /* math/special */
*s = '\0';
dc.lastfnt = dc.thisfnt;
dc.thisfnt = 4;
break;
case 'P': /* previous (exchange) */
if (dc.dofnt == YES)
{
if (dc.lastfnt == 1)
{
if (dc.thisfnt == 2)
strcpy (s, e_italic);
else if (dc.thisfnt == 3)
strcpy (s, e_bold);
}
else if (dc.lastfnt == 2)
{
strcpy (s, s_italic); /* to I */
}
else if (dc.lastfnt == 3)
{
strcpy (s, s_bold); /* to B */
}
else
*s = '\0'; /* nothing */
}
tmp = dc.thisfnt; /* swap this/last */
dc.thisfnt = dc.lastfnt;
dc.lastfnt = tmp;
break;
default:
*s = '\0';
break;
}
set_ireg (".f", dc.thisfnt, 0);
}
/*------------------------------*/
/* findreg */
/*------------------------------*/
findreg (name)
register char *name;
{
/*
* find register named 'name' in pool. return index into array or -1
* if not found.
*/
register int i;
register char *prname;
for (i = 0; i < MAXREGS; i++)
{
prname = rg[i].rname;
if (*prname == *name && *(prname + 1) == *(name + 1))
break;
}
return ((i < MAXREGS) ? i : -1);
}