sim_fio.c - emulators/simh - Rivoreo Source Code Repositories

 /* sim_fio.c: simulator file I/O library

    Copyright (c) 1993-2006, Robert M Supnik

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
    ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
    IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

    Except as contained in this notice, the name of Robert M Supnik shall not be
    used in advertising or otherwise to promote the sale, use or other dealings
    in this Software without prior written authorization from Robert M Supnik.

    10-Jul-06    RMS     Fixed linux conditionalization (from Chaskiel Grundman)
    15-May-06    RMS     Added sim_fsize_name
    21-Apr-06    RMS     Added FreeBSD large file support (from Mark Martinec)
    19-Nov-05    RMS     Added OS/X large file support (from Peter Schorn)
    16-Aug-05    RMS     Fixed C++ declaration and cast problems
    17-Jul-04    RMS     Fixed bug in optimized sim_fread (reported by Scott Bailey)
    26-May-04    RMS     Optimized sim_fread (suggested by John Dundas)
    02-Jan-04    RMS     Split out from SCP

    This library includes:

    sim_finit    -       initialize package
    sim_fopen    -       open file
    sim_fread    -       endian independent read (formerly fxread)
    sim_write    -       endian independent write (formerly fxwrite)
    sim_fseek    -       extended (>32b) seek (formerly fseek_ext)
    sim_fsize    -       get file size

    sim_fopen and sim_fseek are OS-dependent.  The other routines are not.
    sim_fsize is always a 32b routine (it is used only with small capacity random
    access devices like fixed head disks and DECtapes).
 */

 #include "sim_defs.h"

 static unsigned char sim_flip[FLIP_SIZE];
 int32 sim_end = 1;                                      /* 1 = little */

 /* OS-independent, endian independent binary I/O package

    For consistency, all binary data read and written by the simulator
    is stored in little endian data order.  That is, in a multi-byte
    data item, the bytes are written out right to left, low order byte
    to high order byte.  On a big endian host, data is read and written
    from high byte to low byte.  Consequently, data written on a little
    endian system must be byte reversed to be usable on a big endian
    system, and vice versa.

    These routines are analogs of the standard C runtime routines
    fread and fwrite.  If the host is little endian, or the data items
    are size char, then the calls are passed directly to fread or
    fwrite.  Otherwise, these routines perform the necessary byte swaps.
    Sim_fread swaps in place, sim_fwrite uses an intermediate buffer.
 */

 int32 sim_finit (void)
 {
 union {int32 i; char c[sizeof (int32)]; } end_test;

 end_test.i = 1;                                         /* test endian-ness */
 sim_end = end_test.c[0];
 return sim_end;
 }

 size_t sim_fread (void *bptr, size_t size, size_t count, FILE *fptr)
 {
 size_t c, j;
 int32 k;
 unsigned char by, *sptr, *dptr;

 if ((size == 0) || (count == 0)) return 0;              /* check arguments */
 c = fread (bptr, size, count, fptr);                    /* read buffer */
 if (sim_end || (size == sizeof (char)) || (c == 0))     /* le, byte, or err? */
     return c;                                           /* done */
 for (j = 0, dptr = sptr = (unsigned char *) bptr; j < c; j++) { /* loop on items */
     for (k = size - 1; k >= (((int32) size + 1) / 2); k--) {
         by = *sptr;                                     /* swap end-for-end */
         *sptr++ = *(dptr + k);
         *(dptr + k) = by;
         }
     sptr = dptr = dptr + size;                          /* next item */
     }
 return c;
 }

 size_t sim_fwrite (void *bptr, size_t size, size_t count, FILE *fptr)
 {
 size_t c, j, nelem, nbuf, lcnt, total;
 int32 i, k;
 unsigned char *sptr, *dptr;

 if ((size == 0) || (count == 0)) return 0;              /* check arguments */
 if (sim_end || (size == sizeof (char)))                 /* le or byte? */
     return fwrite (bptr, size, count, fptr);            /* done */
 nelem = FLIP_SIZE / size;                               /* elements in buffer */
 nbuf = count / nelem;                                   /* number buffers */
 lcnt = count % nelem;                                   /* count in last buf */
 if (lcnt) nbuf = nbuf + 1;
 else lcnt = nelem;
 total = 0;
 sptr = (unsigned char *) bptr;                          /* init input ptr */
 for (i = nbuf; i > 0; i--) {                            /* loop on buffers */
     c = (i == 1)? lcnt: nelem;
     for (j = 0, dptr = sim_flip; j < c; j++) {          /* loop on items */
         for (k = size - 1; k >= 0; k--) *(dptr + k) = *sptr++;
         dptr = dptr + size;
         }
     c = fwrite (sim_flip, size, c, fptr);
     if (c == 0) return total;
     total = total + c;
     }
 return total;
 }

 /* Get file size */

 uint32 sim_fsize_name (char *fname)
 {
 FILE *fp;
 uint32 sz;

 if ((fp = sim_fopen (fname, "rb")) == NULL) return 0;
 sz = sim_fsize (fp);
 fclose (fp);
 return sz;
 }

 uint32 sim_fsize (FILE *fp)
 {
 uint32 pos, sz;

 if (fp == NULL) return 0;
 pos = ftell (fp);
 fseek (fp, 0, SEEK_END);
 sz = ftell (fp);
 fseek (fp, pos, SEEK_SET);
 return sz;
 }

 /* OS-dependent routines */

 /* Optimized file open */

 FILE *sim_fopen (const char *file, const char *mode)
 {
 #if defined (VMS)
 return fopen (file, mode, "ALQ=32", "DEQ=4096",
         "MBF=6", "MBC=127", "FOP=cbt,tef", "ROP=rah,wbh", "CTX=stm");
 #elif defined (USE_INT64) && defined (USE_ADDR64) && defined (__linux)
 return fopen64 (file, mode);
 #else
 return fopen (file, mode);
 #endif
 }

 /* Long seek */

 #if defined (USE_INT64) && defined (USE_ADDR64)

 /* Alpha VMS */

 #if defined (__ALPHA) && defined (VMS)                  /* Alpha VMS */
 #define _SIM_IO_FSEEK_EXT_      1

 static t_int64 fpos_t_to_int64 (fpos_t *pos)
 {
 unsigned short *w = (unsigned short *) pos;             /* endian dep! */
 t_int64 result;

 result = w[1];
 result <<= 16;
 result += w[0];
 result <<= 9;
 result += w[2];
 return result;
 }

 static void int64_to_fpos_t (t_int64 ipos, fpos_t *pos, size_t mbc)
 {
 unsigned short *w = (unsigned short *) pos;
 int bufsize = mbc << 9;

 w[3] = 0;
 w[2] = (unsigned short) (ipos % bufsize);
 ipos -= w[2];
 ipos >>= 9;
 w[0] = (unsigned short) ipos;
 ipos >>= 16;
 w[1] = (unsigned short) ipos;
 if ((w[2] == 0) && (w[0] || w[1])) {
     w[2] = bufsize;
     w[0] -= mbc;
     }
 return;
 }

 int sim_fseek (FILE *st, t_addr offset, int whence)
 {
 t_addr fileaddr;
 fpos_t filepos;

 switch (whence) {

     case SEEK_SET:
         fileaddr = offset;
         break;

     case SEEK_CUR:
         if (fgetpos (st, &filepos)) return (-1);
         fileaddr = fpos_t_to_int64 (&filepos);
         fileaddr = fileaddr + offset;
         break;

     default:
         errno = EINVAL;
         return (-1);
         }

 int64_to_fpos_t (fileaddr, &filepos, 127);
 return fsetpos (st, &filepos);
 }

 #endif

 /* Alpha UNIX - natively 64b */

 #if defined (__ALPHA) && defined (__unix__)             /* Alpha UNIX */
 #define _SIM_IO_FSEEK_EXT_      1

 int sim_fseek (FILE *st, t_addr offset, int whence)
 {
 return fseek (st, offset, whence);
 }

 #endif

 /* Windows */

 #if defined (_WIN32)
 #define _SIM_IO_FSEEK_EXT_      1

 int sim_fseek (FILE *st, t_addr offset, int whence)
 {
 fpos_t fileaddr;

 switch (whence) {

     case SEEK_SET:
         fileaddr = offset;
         break;

     case SEEK_CUR:
         if (fgetpos (st, &fileaddr)) return (-1);
         fileaddr = fileaddr + offset;
         break;

     default:
         errno = EINVAL;
         return (-1);
         }

 return fsetpos (st, &fileaddr);
 }

 #endif                                                  /* end Windows */

 /* Linux */

 #if defined (__linux)
 #define _SIM_IO_FSEEK_EXT_      1

 int sim_fseek (FILE *st, t_addr xpos, int origin)
 {
 return fseeko64 (st, xpos, origin);
 }

 #endif                                                  /* end Linux with LFS */

 /* Apple OS/X */

 #if defined (__APPLE__) || defined (__FreeBSD__)
 #define _SIM_IO_FSEEK_EXT_      1

 int sim_fseek (FILE *st, t_addr xpos, int origin)
 {
 return fseeko (st, xpos, origin);
 }

 #endif  /* end Apple OS/X */

 #endif                                                  /* end 64b seek defs */

 /* Default: no OS-specific routine has been defined */

 #if !defined (_SIM_IO_FSEEK_EXT_)
 #define _SIM_IO_FSEEK_EXT_      0

 int sim_fseek (FILE *st, t_addr xpos, int origin)
 {
 return fseek (st, (int32) xpos, origin);
 }

 #endif

 uint32 sim_taddr_64 = _SIM_IO_FSEEK_EXT_;
	/* sim_fio.c: simulator file I/O library

	Copyright (c) 1993-2006, Robert M Supnik

	Permission is hereby granted, free of charge, to any person obtaining a
	copy of this software and associated documentation files (the "Software"),
	to deal in the Software without restriction, including without limitation
	the rights to use, copy, modify, merge, publish, distribute, sublicense,
	and/or sell copies of the Software, and to permit persons to whom the
	Software is furnished to do so, subject to the following conditions:

	The above copyright notice and this permission notice shall be included in
	all copies or substantial portions of the Software.

	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
	IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
	CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

	Except as contained in this notice, the name of Robert M Supnik shall not be
	used in advertising or otherwise to promote the sale, use or other dealings
	in this Software without prior written authorization from Robert M Supnik.

	10-Jul-06 RMS Fixed linux conditionalization (from Chaskiel Grundman)
	15-May-06 RMS Added sim_fsize_name
	21-Apr-06 RMS Added FreeBSD large file support (from Mark Martinec)
	19-Nov-05 RMS Added OS/X large file support (from Peter Schorn)
	16-Aug-05 RMS Fixed C++ declaration and cast problems
	17-Jul-04 RMS Fixed bug in optimized sim_fread (reported by Scott Bailey)
	26-May-04 RMS Optimized sim_fread (suggested by John Dundas)
	02-Jan-04 RMS Split out from SCP

	This library includes:

	sim_finit - initialize package
	sim_fopen - open file
	sim_fread - endian independent read (formerly fxread)
	sim_write - endian independent write (formerly fxwrite)
	sim_fseek - extended (>32b) seek (formerly fseek_ext)
	sim_fsize - get file size

	sim_fopen and sim_fseek are OS-dependent. The other routines are not.
	sim_fsize is always a 32b routine (it is used only with small capacity random
	access devices like fixed head disks and DECtapes).
	*/

	#include "sim_defs.h"

	static unsigned char sim_flip[FLIP_SIZE];
	int32 sim_end = 1; /* 1 = little */

	/* OS-independent, endian independent binary I/O package

	For consistency, all binary data read and written by the simulator
	is stored in little endian data order. That is, in a multi-byte
	data item, the bytes are written out right to left, low order byte
	to high order byte. On a big endian host, data is read and written
	from high byte to low byte. Consequently, data written on a little
	endian system must be byte reversed to be usable on a big endian
	system, and vice versa.

	These routines are analogs of the standard C runtime routines
	fread and fwrite. If the host is little endian, or the data items
	are size char, then the calls are passed directly to fread or
	fwrite. Otherwise, these routines perform the necessary byte swaps.
	Sim_fread swaps in place, sim_fwrite uses an intermediate buffer.
	*/

	int32 sim_finit (void)
	{
	union {int32 i; char c[sizeof (int32)]; } end_test;

	end_test.i = 1; /* test endian-ness */
	sim_end = end_test.c[0];
	return sim_end;
	}

	size_t sim_fread (void bptr, size_t size, size_t count, FILE fptr)
	{
	size_t c, j;
	int32 k;
	unsigned char by, sptr, dptr;

	if ((size == 0) \|\| (count == 0)) return 0; /* check arguments */
	c = fread (bptr, size, count, fptr); /* read buffer */
	if (sim_end \|\| (size == sizeof (char)) \|\| (c == 0)) /* le, byte, or err? */
	return c; /* done */
	for (j = 0, dptr = sptr = (unsigned char ) bptr; j < c; j++) { / loop on items */
	for (k = size - 1; k >= (((int32) size + 1) / 2); k--) {
	by = sptr; / swap end-for-end */
	sptr++ = (dptr + k);
	*(dptr + k) = by;
	}
	sptr = dptr = dptr + size; /* next item */
	}
	return c;
	}

	size_t sim_fwrite (void bptr, size_t size, size_t count, FILE fptr)
	{
	size_t c, j, nelem, nbuf, lcnt, total;
	int32 i, k;
	unsigned char sptr, dptr;

	if ((size == 0) \|\| (count == 0)) return 0; /* check arguments */
	if (sim_end \|\| (size == sizeof (char))) /* le or byte? */
	return fwrite (bptr, size, count, fptr); /* done */
	nelem = FLIP_SIZE / size; /* elements in buffer */
	nbuf = count / nelem; /* number buffers */
	lcnt = count % nelem; /* count in last buf */
	if (lcnt) nbuf = nbuf + 1;
	else lcnt = nelem;
	total = 0;
	sptr = (unsigned char ) bptr; / init input ptr */
	for (i = nbuf; i > 0; i--) { /* loop on buffers */
	c = (i == 1)? lcnt: nelem;
	for (j = 0, dptr = sim_flip; j < c; j++) { /* loop on items */
	for (k = size - 1; k >= 0; k--) (dptr + k) = sptr++;
	dptr = dptr + size;
	}
	c = fwrite (sim_flip, size, c, fptr);
	if (c == 0) return total;
	total = total + c;
	}
	return total;
	}

	/* Get file size */

	uint32 sim_fsize_name (char *fname)
	{
	FILE *fp;
	uint32 sz;

	if ((fp = sim_fopen (fname, "rb")) == NULL) return 0;
	sz = sim_fsize (fp);
	fclose (fp);
	return sz;
	}

	uint32 sim_fsize (FILE *fp)
	{
	uint32 pos, sz;

	if (fp == NULL) return 0;
	pos = ftell (fp);
	fseek (fp, 0, SEEK_END);
	sz = ftell (fp);
	fseek (fp, pos, SEEK_SET);
	return sz;
	}

	/* OS-dependent routines */

	/* Optimized file open */

	FILE sim_fopen (const char file, const char *mode)
	{
	#if defined (VMS)
	return fopen (file, mode, "ALQ=32", "DEQ=4096",
	"MBF=6", "MBC=127", "FOP=cbt,tef", "ROP=rah,wbh", "CTX=stm");
	#elif defined (USE_INT64) && defined (USE_ADDR64) && defined (__linux)
	return fopen64 (file, mode);
	#else
	return fopen (file, mode);
	#endif
	}

	/* Long seek */

	#if defined (USE_INT64) && defined (USE_ADDR64)

	/* Alpha VMS */

	#if defined (__ALPHA) && defined (VMS) /* Alpha VMS */
	#define _SIM_IO_FSEEK_EXT_ 1

	static t_int64 fpos_t_to_int64 (fpos_t *pos)
	{
	unsigned short w = (unsigned short ) pos; /* endian dep! */
	t_int64 result;

	result = w[1];
	result <<= 16;
	result += w[0];
	result <<= 9;
	result += w[2];
	return result;
	}

	static void int64_to_fpos_t (t_int64 ipos, fpos_t *pos, size_t mbc)
	{
	unsigned short w = (unsigned short ) pos;
	int bufsize = mbc << 9;

	w[3] = 0;
	w[2] = (unsigned short) (ipos % bufsize);
	ipos -= w[2];
	ipos >>= 9;
	w[0] = (unsigned short) ipos;
	ipos >>= 16;
	w[1] = (unsigned short) ipos;
	if ((w[2] == 0) && (w[0] \|\| w[1])) {
	w[2] = bufsize;
	w[0] -= mbc;
	}
	return;
	}

	int sim_fseek (FILE *st, t_addr offset, int whence)
	{
	t_addr fileaddr;
	fpos_t filepos;

	switch (whence) {

	case SEEK_SET:
	fileaddr = offset;
	break;

	case SEEK_CUR:
	if (fgetpos (st, &filepos)) return (-1);
	fileaddr = fpos_t_to_int64 (&filepos);
	fileaddr = fileaddr + offset;
	break;

	default:
	errno = EINVAL;
	return (-1);
	}

	int64_to_fpos_t (fileaddr, &filepos, 127);
	return fsetpos (st, &filepos);
	}

	#endif

	/* Alpha UNIX - natively 64b */

	#if defined (__ALPHA) && defined (__unix__) /* Alpha UNIX */
	#define _SIM_IO_FSEEK_EXT_ 1

	int sim_fseek (FILE *st, t_addr offset, int whence)
	{
	return fseek (st, offset, whence);
	}

	#endif

	/* Windows */

	#if defined (_WIN32)
	#define _SIM_IO_FSEEK_EXT_ 1

	int sim_fseek (FILE *st, t_addr offset, int whence)
	{
	fpos_t fileaddr;

	switch (whence) {

	case SEEK_SET:
	fileaddr = offset;
	break;

	case SEEK_CUR:
	if (fgetpos (st, &fileaddr)) return (-1);
	fileaddr = fileaddr + offset;
	break;

	default:
	errno = EINVAL;
	return (-1);
	}

	return fsetpos (st, &fileaddr);
	}

	#endif /* end Windows */

	/* Linux */

	#if defined (__linux)
	#define _SIM_IO_FSEEK_EXT_ 1

	int sim_fseek (FILE *st, t_addr xpos, int origin)
	{
	return fseeko64 (st, xpos, origin);
	}

	#endif /* end Linux with LFS */

	/* Apple OS/X */

	#if defined (__APPLE__) \|\| defined (__FreeBSD__)
	#define _SIM_IO_FSEEK_EXT_ 1

	int sim_fseek (FILE *st, t_addr xpos, int origin)
	{
	return fseeko (st, xpos, origin);
	}

	#endif /* end Apple OS/X */

	#endif /* end 64b seek defs */

	/* Default: no OS-specific routine has been defined */

	#if !defined (_SIM_IO_FSEEK_EXT_)
	#define _SIM_IO_FSEEK_EXT_ 0

	int sim_fseek (FILE *st, t_addr xpos, int origin)
	{
	return fseek (st, (int32) xpos, origin);
	}

	#endif

	uint32 sim_taddr_64 = _SIM_IO_FSEEK_EXT_;