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