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Language/OS - Multiplatform Resource Library
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LANGUAGE OS.iso
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gnu
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groff108.lha
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groff-1.08
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libdriver
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input.cc
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C/C++ Source or Header
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1992-11-25
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10KB
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474 lines
// -*- C++ -*-
/* Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
Written by James Clark (jjc@jclark.com)
This file is part of groff.
groff is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
groff is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License along
with groff; see the file COPYING. If not, write to the Free Software
Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "driver.h"
#include "device.h"
const char *current_filename;
int current_lineno;
const char *device = 0;
FILE *current_file;
int get_integer(); // don't read the newline
int possibly_get_integer(int *);
char *get_string(int is_long = 0);
void skip_line();
struct environment_list {
environment env;
environment_list *next;
environment_list(const environment &, environment_list *);
};
environment_list::environment_list(const environment &e, environment_list *p)
: env(e), next(p)
{
}
inline int get_char()
{
return getc(current_file);
}
void do_file(const char *filename)
{
int npages = 0;
if (filename[0] == '-' && filename[1] == '\0') {
current_filename = "<standard input>";
current_file = stdin;
}
else {
errno = 0;
current_file = fopen(filename, "r");
if (current_file == 0) {
error("can't open `%1'", filename);
return;
}
current_filename = filename;
}
environment env;
env.vpos = -1;
env.hpos = -1;
env.fontno = -1;
env.height = 0;
env.slant = 0;
environment_list *env_list = 0;
current_lineno = 1;
int command;
char *s;
command = get_char();
if (command == EOF)
return;
if (command != 'x')
fatal("the first command must be `x T'");
s = get_string();
if (s[0] != 'T')
fatal("the first command must be `x T'");
char *dev = get_string();
if (pr == 0) {
device = strsave(dev);
if (!font::load_desc())
fatal("sorry, I can't continue");
}
else {
if (device == 0 || strcmp(device, dev) != 0)
fatal("all files must use the same device");
}
skip_line();
env.size = 10*font::sizescale;
command = get_char();
if (command != 'x')
fatal("the second command must be `x res'");
s = get_string();
if (s[0] != 'r')
fatal("the second command must be `x res'");
int n = get_integer();
if (n != font::res)
fatal("resolution does not match");
n = get_integer();
if (n != font::hor)
fatal("horizontal resolution does not match");
n = get_integer();
if (n != font::vert)
fatal("vertical resolution does not match");
skip_line();
command = get_char();
if (command != 'x')
fatal("the third command must be `x init'");
s = get_string();
if (s[0] != 'i')
fatal("the third command must be `x init'");
skip_line();
if (pr == 0)
pr = make_printer();
while ((command = get_char()) != EOF) {
switch (command) {
case 's':
env.size = get_integer();
if (env.height == env.size)
env.height = 0;
break;
case 'f':
env.fontno = get_integer();
break;
case 'C':
{
if (npages == 0)
fatal("`C' command illegal before first `p' command");
char *s = get_string();
pr->set_special_char(s, &env);
}
break;
case 'N':
{
if (npages == 0)
fatal("`N' command illegal before first `p' command");
pr->set_numbered_char(get_integer(), &env);
}
break;
case 'H':
env.hpos = get_integer();
break;
case 'h':
env.hpos += get_integer();
break;
case 'V':
env.vpos = get_integer();
break;
case 'v':
env.vpos += get_integer();
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
{
int c = get_char();
if (!isascii(c) || !isdigit(c))
fatal("digit expected");
env.hpos += (command - '0')*10 + (c - '0');
}
// fall through
case 'c':
{
if (npages == 0)
fatal("`c' command illegal before first `p' command");
int c = get_char();
if (c == EOF)
fatal("missing argument to `c' command");
pr->set_ascii_char(c, &env);
}
break;
case 'n':
if (npages == 0)
fatal("`n' command illegal before first `p' command");
pr->end_of_line();
(void)get_integer();
(void)get_integer();
break;
case 'w':
case ' ':
break;
case '\n':
current_lineno++;
break;
case 'p':
if (npages)
pr->end_page(env.vpos);
npages++;
pr->begin_page(get_integer());
env.vpos = 0;
break;
case '{':
env_list = new environment_list(env, env_list);
break;
case '}':
if (!env_list) {
fatal("can't pop");
}
else {
env = env_list->env;
environment_list *tem = env_list;
env_list = env_list->next;
delete tem;
}
break;
case 'u':
{
if (npages == 0)
fatal("`u' command illegal before first `p' command");
int kern = get_integer();
int c = get_char();
while (c == ' ')
c = get_char();
while (c != EOF) {
if (c == '\n') {
current_lineno++;
break;
}
int w;
pr->set_ascii_char(c, &env, &w);
env.hpos += w + kern;
c = get_char();
if (c == ' ')
break;
}
}
break;
case 't':
{
if (npages == 0)
fatal("`t' command illegal before first `p' command");
int c;
while ((c = get_char()) != EOF && c != ' ') {
if (c == '\n') {
current_lineno++;
break;
}
int w;
pr->set_ascii_char(c, &env, &w);
env.hpos += w;
}
}
break;
case '#':
skip_line();
break;
case 'D':
{
if (npages == 0)
fatal("`D' command illegal before first `p' command");
int c;
while ((c = get_char()) == ' ')
;
int n;
int *p = 0;
int szp = 0;
for (int np = 0; possibly_get_integer(&n); np++) {
if (np >= szp) {
if (szp == 0) {
szp = 16;
p = new int[szp];
}
else {
int *oldp = p;
p = new int[szp*2];
memcpy(p, oldp, szp*sizeof(int));
szp *= 2;
a_delete oldp;
}
}
p[np] = n;
}
pr->draw(c, p, np, &env);
if (c == 'e') {
if (np > 0)
env.hpos += p[0];
}
else {
for (int i = 0; i < np/2; i++) {
env.hpos += p[i*2];
env.vpos += p[i*2 + 1];
}
// there might be an odd number of characters
if (i*2 < np)
env.hpos += p[i*2];
}
a_delete p;
skip_line();
}
break;
case 'x':
{
char *s = get_string();
int suppress_skip = 0;
switch (s[0]) {
case 'i':
error("duplicate `x init' command");
break;
case 'T':
error("duplicate `x T' command");
break;
case 'r':
error("duplicate `x res' command");
break;
case 'p':
break;
case 's':
break;
case 't':
break;
case 'f':
{
int n = get_integer();
char *name = get_string();
pr->load_font(n, name);
}
break;
case 'H':
env.height = get_integer();
if (env.height == env.size)
env.height = 0;
break;
case 'S':
env.slant = get_integer();
break;
case 'X':
if (npages == 0)
fatal("`x X' command illegal before first `p' command");
pr->special(get_string(1), &env);
suppress_skip = 1;
break;
default:
error("unrecognised x command `%1'", s);
}
if (!suppress_skip)
skip_line();
}
break;
default:
error("unrecognised command code %1", int(command));
skip_line();
break;
}
}
if (npages)
pr->end_page(env.vpos);
}
int get_integer()
{
int c = get_char();
while (c == ' ')
c = get_char();
int neg = 0;
if (c == '-') {
neg = 1;
c = get_char();
}
if (!isascii(c) || !isdigit(c))
fatal("integer expected");
int total = 0;
do {
total = total*10;
if (neg)
total -= c - '0';
else
total += c - '0';
c = get_char();
} while (isascii(c) && isdigit(c));
if (c != EOF)
ungetc(c, current_file);
return total;
}
int possibly_get_integer(int *res)
{
int c = get_char();
while (c == ' ')
c = get_char();
int neg = 0;
if (c == '-') {
neg = 1;
c = get_char();
}
if (!isascii(c) || !isdigit(c)) {
if (c != EOF)
ungetc(c, current_file);
return 0;
}
int total = 0;
do {
total = total*10;
if (neg)
total -= c - '0';
else
total += c - '0';
c = get_char();
} while (isascii(c) && isdigit(c));
if (c != EOF)
ungetc(c, current_file);
*res = total;
return 1;
}
char *get_string(int is_long)
{
static char *buf;
static int buf_size;
int c = get_char();
while (c == ' ')
c = get_char();
for (int i = 0;; i++) {
if (i >= buf_size) {
if (buf_size == 0) {
buf_size = 16;
buf = new char[buf_size];
}
else {
char *old_buf = buf;
int old_size = buf_size;
buf_size *= 2;
buf = new char[buf_size];
memcpy(buf, old_buf, old_size);
a_delete old_buf;
}
}
if ((!is_long && (c == ' ' || c == '\n')) || c == EOF) {
buf[i] = '\0';
break;
}
if (is_long && c == '\n') {
current_lineno++;
c = get_char();
if (c == '+')
c = '\n';
else {
buf[i] = '\0';
break;
}
}
buf[i] = c;
c = get_char();
}
if (c != EOF)
ungetc(c, current_file);
return buf;
}
void skip_line()
{
int c;
while ((c = get_char()) != EOF)
if (c == '\n') {
current_lineno++;
break;
}
}