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/*
* DVI previewer for X.
*
* Eric Cooper, CMU, September 1985.
*
* Code derived from dvi-imagen.c.
*
* Modification history:
* 1/1986 Modified for X.10 --Bob Scheifler, MIT LCS.
* 7/1988 Modified for X.11 --Mark Eichin, MIT
* 12/1988 Added 'R' option, toolkit, magnifying glass
* --Paul Vojta, UC Berkeley.
* 2/1989 Added tpic support --Jeffrey Lee, U of Toronto
* 4/1989 Modified for System V --Donald Richardson, Clarkson Univ.
* 3/1990 Added VMS support --Scott Allendorf, U of Iowa
* 7/1990 Added reflection mode --Michael Pak, Hebrew U of Jerusalem
* 1/1992 Added greyscale code --Till Brychcy, Techn. Univ. Muenchen
* and Lee Hetherington, MIT
*
* Compilation options:
* SYSV compile for System V
* VMS compile for VMS
* X10 compile for X10
* NOTOOL compile without toolkit (X11 only)
* BUTTONS compile with buttons on the side of the window (needs toolkit)
* MSBITFIRST store bitmaps internally with most significant bit first
* BMSHORT store bitmaps in shorts instead of bytes
* BMLONG store bitmaps in longs instead of bytes
* ALTFONT default for -altfont option
* A4 use European size paper
* TEXXET support reflection dvi codes (right-to-left typesetting)
*/
#include "xdvi.h"
#include <errno.h>
int errno;
#ifdef VMS
#include <rmsdef.h>
#endif /* VMS */
#ifndef X_NOT_STDC_ENV
#include <stdlib.h>
#else
char *malloc();
#endif
#if defined(macII) && !defined(__STDC__) /* stdlib.h doesn't define these */
char *malloc();
#endif /* macII */
#if NeedVarargsPrototypes /* this is for oops */
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#ifdef DOPRNT /* define this if vfprintf gives you trouble */
#define vfprintf(stream, message, args) _doprnt(message, args, stream)
#endif
/*
* General utility routines.
*/
/*
* Print error message and quit.
*/
#if NeedVarargsPrototypes
NORETURN void
oops(_Xconst char *message, ...)
#else
/* VARARGS */
NORETURN void
oops(va_alist)
va_dcl
#endif
{
#if !NeedVarargsPrototypes
_Xconst char *message;
#endif
va_list args;
Fprintf(stderr, "%s: ", prog);
#if NeedVarargsPrototypes
va_start(args, message);
#else
va_start(args);
message = va_arg(args, _Xconst char *);
#endif
(void) vfprintf(stderr, message, args);
va_end(args);
Putc('\n', stderr);
exit(1);
}
/*
* Either allocate storage or fail with explanation.
*/
char *
xmalloc(size, why)
unsigned size;
_Xconst char *why;
{
char *mem = malloc(size);
if (mem == NULL)
oops("! Cannot allocate %u bytes for %s.\n", size, why);
return mem;
}
/*
* Allocate bitmap for given font and character
*/
void
alloc_bitmap(bitmap)
register struct bitmap *bitmap;
{
register unsigned int size;
/* width must be multiple of 16 bits for raster_op */
bitmap->bytes_wide = ROUNDUP(bitmap->w, BITS_PER_BMUNIT) *
BYTES_PER_BMUNIT;
size = bitmap->bytes_wide * bitmap->h;
bitmap->bits = xmalloc(size != 0 ? size : 1, "character bitmap");
}
/*
* Close the pixel file for the least recently used font.
*/
static void
close_a_file()
{
register struct font *fontp;
unsigned short oldest = ~0;
struct font *f = NULL;
for (fontp = font_head; fontp != NULL; fontp = fontp->next)
if (fontp->file != NULL && fontp->timestamp <= oldest) {
f = fontp;
oldest = fontp->timestamp;
}
if (f == NULL)
oops("Can't find an open pixel file to close");
Fclose(f->file);
f->file = NULL;
++n_files_left;
}
/*
* Open a file in the given mode.
*/
FILE *
xfopen(filename)
_Xconst char *filename;
{
FILE *f;
if (n_files_left == 0) close_a_file();
f = fopen(filename, OPEN_MODE);
#ifndef VMS
/* ericho if (f == NULL && (errno == EMFILE || errno == ENFILE)) */
if (f == NULL && (errno == EMFILE))
#else /* VMS */
if (f == NULL && errno == EVMSERR && vaxc$errno == RMS$_ACC)
#endif /* VMS */
{
n_files_left = 0;
close_a_file();
f = fopen(filename, OPEN_MODE);
}
return f;
}
/*
*
* Read size bytes from the FILE fp, constructing them into a
* signed/unsigned integer.
*
*/
unsigned long
num(fp, size)
register FILE *fp;
register int size;
{
register long x = 0;
while (size--) x = (x << 8) | one(fp);
return x;
}
long
snum(fp, size)
register FILE *fp;
register int size;
{
register long x;
#ifdef __STDC__
x = (signed char) getc(fp);
#else
x = (unsigned char) getc(fp);
if (x & 0x80) x -= 0x100;
#endif
while (--size) x = (x << 8) | one(fp);
return x;
}
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