minix/commands/mdocml/term_ps.c
2010-06-26 02:20:06 +00:00

430 lines
9.3 KiB
C

/* $Id: term_ps.c,v 1.10 2010/06/19 20:46:28 kristaps Exp $ */
/*
* Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@bsd.lv>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "out.h"
#include "main.h"
#include "term.h"
#define PS_CHAR_WIDTH 6
#define PS_CHAR_HEIGHT 12
#define PS_CHAR_TOPMARG (792 - 24)
#define PS_CHAR_TOP (PS_CHAR_TOPMARG - 36)
#define PS_CHAR_LEFT 36
#define PS_CHAR_BOTMARG 24
#define PS_CHAR_BOT (PS_CHAR_BOTMARG + 36)
#define PS_BUFSLOP 128
#define PS_GROWBUF(p, sz) \
do if ((p)->engine.ps.psmargcur + (sz) > \
(p)->engine.ps.psmargsz) { \
(p)->engine.ps.psmargsz += /* CONSTCOND */ \
MAX(PS_BUFSLOP, (sz)); \
(p)->engine.ps.psmarg = realloc \
((p)->engine.ps.psmarg, \
(p)->engine.ps.psmargsz); \
if (NULL == (p)->engine.ps.psmarg) { \
perror(NULL); \
exit(EXIT_FAILURE); \
} \
} while (/* CONSTCOND */ 0)
#ifndef MAX
#define MAX(x,y) ((x) > (y) ? (x) : (y))
#endif
static void ps_letter(struct termp *, char);
static void ps_begin(struct termp *);
static void ps_end(struct termp *);
static void ps_advance(struct termp *, size_t);
static void ps_endline(struct termp *);
static void ps_fclose(struct termp *);
static void ps_pclose(struct termp *);
static void ps_pletter(struct termp *, char);
static void ps_printf(struct termp *, const char *, ...);
static void ps_putchar(struct termp *, char);
static void ps_setfont(struct termp *, enum termfont);
void *
ps_alloc(void)
{
struct termp *p;
if (NULL == (p = term_alloc(TERMENC_ASCII)))
return(NULL);
p->type = TERMTYPE_PS;
p->letter = ps_letter;
p->begin = ps_begin;
p->end = ps_end;
p->advance = ps_advance;
p->endline = ps_endline;
return(p);
}
void
ps_free(void *arg)
{
struct termp *p;
p = (struct termp *)arg;
if (p->engine.ps.psmarg)
free(p->engine.ps.psmarg);
term_free(p);
}
static void
ps_printf(struct termp *p, const char *fmt, ...)
{
va_list ap;
int pos;
va_start(ap, fmt);
/*
* If we're running in regular mode, then pipe directly into
* vprintf(). If we're processing margins, then push the data
* into our growable margin buffer.
*/
if ( ! (PS_MARGINS & p->engine.ps.psstate)) {
vprintf(fmt, ap);
va_end(ap);
return;
}
/*
* XXX: I assume that the in-margin print won't exceed
* PS_BUFSLOP (128 bytes), which is reasonable but still an
* assumption that will cause pukeage if it's not the case.
*/
PS_GROWBUF(p, PS_BUFSLOP);
pos = (int)p->engine.ps.psmargcur;
vsnprintf(&p->engine.ps.psmarg[pos], PS_BUFSLOP, fmt, ap);
p->engine.ps.psmargcur = strlen(p->engine.ps.psmarg);
va_end(ap);
}
static void
ps_putchar(struct termp *p, char c)
{
int pos;
/* See ps_printf(). */
if ( ! (PS_MARGINS & p->engine.ps.psstate)) {
putchar(c);
return;
}
PS_GROWBUF(p, 2);
pos = (int)p->engine.ps.psmargcur++;
p->engine.ps.psmarg[pos++] = c;
p->engine.ps.psmarg[pos] = '\0';
}
/* ARGSUSED */
static void
ps_end(struct termp *p)
{
/*
* At the end of the file, do one last showpage. This is the
* same behaviour as groff(1) and works for multiple pages as
* well as just one.
*/
assert(0 == p->engine.ps.psstate);
assert('\0' == p->engine.ps.last);
assert(p->engine.ps.psmarg && p->engine.ps.psmarg[0]);
printf("%s", p->engine.ps.psmarg);
printf("showpage\n");
printf("%s\n", "%%EOF");
}
static void
ps_begin(struct termp *p)
{
/*
* Print margins into margin buffer. Nothing gets output to the
* screen yet, so we don't need to initialise the primary state.
*/
if (p->engine.ps.psmarg) {
assert(p->engine.ps.psmargsz);
p->engine.ps.psmarg[0] = '\0';
}
p->engine.ps.psmargcur = 0;
p->engine.ps.psstate = PS_MARGINS;
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_TOPMARG;
ps_setfont(p, TERMFONT_NONE);
(*p->headf)(p, p->argf);
(*p->endline)(p);
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_BOTMARG;
(*p->footf)(p, p->argf);
(*p->endline)(p);
p->engine.ps.psstate &= ~PS_MARGINS;
assert(0 == p->engine.ps.psstate);
assert(p->engine.ps.psmarg);
assert('\0' != p->engine.ps.psmarg[0]);
/*
* Print header and initialise page state. Following this,
* stuff gets printed to the screen, so make sure we're sane.
*/
printf("%s\n", "%!PS");
ps_setfont(p, TERMFONT_NONE);
p->engine.ps.pscol = PS_CHAR_LEFT;
p->engine.ps.psrow = PS_CHAR_TOP;
}
static void
ps_pletter(struct termp *p, char c)
{
/*
* If we're not in a PostScript "word" context, then open one
* now at the current cursor.
*/
if ( ! (PS_INLINE & p->engine.ps.psstate)) {
ps_printf(p, "%zu %zu moveto\n(",
p->engine.ps.pscol,
p->engine.ps.psrow);
p->engine.ps.psstate |= PS_INLINE;
}
/*
* We need to escape these characters as per the PostScript
* specification. We would also escape non-graphable characters
* (like tabs), but none of them would get to this point and
* it's superfluous to abort() on them.
*/
switch (c) {
case ('('):
/* FALLTHROUGH */
case (')'):
/* FALLTHROUGH */
case ('\\'):
ps_putchar(p, '\\');
break;
default:
break;
}
/* Write the character and adjust where we are on the page. */
ps_putchar(p, c);
p->engine.ps.pscol += PS_CHAR_WIDTH;
}
static void
ps_pclose(struct termp *p)
{
/*
* Spit out that we're exiting a word context (this is a
* "partial close" because we don't check the last-char buffer
* or anything).
*/
if ( ! (PS_INLINE & p->engine.ps.psstate))
return;
ps_printf(p, ") show\n");
p->engine.ps.psstate &= ~PS_INLINE;
}
static void
ps_fclose(struct termp *p)
{
/*
* Strong closure: if we have a last-char, spit it out after
* checking that we're in the right font mode. This will of
* course open a new scope, if applicable.
*
* Following this, close out any scope that's open.
*/
if ('\0' != p->engine.ps.last) {
if (p->engine.ps.lastf != TERMFONT_NONE) {
ps_pclose(p);
ps_setfont(p, TERMFONT_NONE);
}
ps_pletter(p, p->engine.ps.last);
p->engine.ps.last = '\0';
}
if ( ! (PS_INLINE & p->engine.ps.psstate))
return;
ps_pclose(p);
}
static void
ps_letter(struct termp *p, char c)
{
char cc;
/*
* State machine dictates whether to buffer the last character
* or not. Basically, encoded words are detected by checking if
* we're an "8" and switching on the buffer. Then we put "8" in
* our buffer, and on the next charater, flush both character
* and buffer. Thus, "regular" words are detected by having a
* regular character and a regular buffer character.
*/
if ('\0' == p->engine.ps.last) {
assert(8 != c);
p->engine.ps.last = c;
return;
} else if (8 == p->engine.ps.last) {
assert(8 != c);
p->engine.ps.last = '\0';
} else if (8 == c) {
assert(8 != p->engine.ps.last);
if ('_' == p->engine.ps.last) {
if (p->engine.ps.lastf != TERMFONT_UNDER) {
ps_pclose(p);
ps_setfont(p, TERMFONT_UNDER);
}
} else if (p->engine.ps.lastf != TERMFONT_BOLD) {
ps_pclose(p);
ps_setfont(p, TERMFONT_BOLD);
}
p->engine.ps.last = c;
return;
} else {
if (p->engine.ps.lastf != TERMFONT_NONE) {
ps_pclose(p);
ps_setfont(p, TERMFONT_NONE);
}
cc = p->engine.ps.last;
p->engine.ps.last = c;
c = cc;
}
ps_pletter(p, c);
}
static void
ps_advance(struct termp *p, size_t len)
{
/*
* Advance some spaces. This can probably be made smarter,
* i.e., to have multiple space-separated words in the same
* scope, but this is easier: just close out the current scope
* and readjust our column settings.
*/
ps_fclose(p);
p->engine.ps.pscol += len ? len * PS_CHAR_WIDTH : 0;
}
static void
ps_endline(struct termp *p)
{
/* Close out any scopes we have open: we're at eoln. */
ps_fclose(p);
/*
* If we're in the margin, don't try to recalculate our current
* row. XXX: if the column tries to be fancy with multiple
* lines, we'll do nasty stuff.
*/
if (PS_MARGINS & p->engine.ps.psstate)
return;
/*
* Put us down a line. If we're at the page bottom, spit out a
* showpage and restart our row.
*/
p->engine.ps.pscol = PS_CHAR_LEFT;
if (p->engine.ps.psrow >= PS_CHAR_HEIGHT + PS_CHAR_BOT) {
p->engine.ps.psrow -= PS_CHAR_HEIGHT;
return;
}
assert(p->engine.ps.psmarg && p->engine.ps.psmarg[0]);
printf("%s", p->engine.ps.psmarg);
printf("showpage\n");
p->engine.ps.psrow = PS_CHAR_TOP;
}
static void
ps_setfont(struct termp *p, enum termfont f)
{
if (TERMFONT_BOLD == f)
ps_printf(p, "/Courier-Bold\n");
else if (TERMFONT_UNDER == f)
ps_printf(p, "/Courier-Oblique\n");
else
ps_printf(p, "/Courier\n");
ps_printf(p, "10 selectfont\n");
p->engine.ps.lastf = f;
}