Bochs/bochs/osdep.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2001-2013 The Bochs Project
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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/////////////////////////////////////////////////////////////////////////
//
// osdep.cc
//
// Provide definition of library functions that are missing on various
// systems. The only reason this is a .cc file rather than a .c file
// is so that it can include bochs.h. Bochs.h includes all the required
// system headers, with appropriate #ifdefs for different compilers and
// platforms.
//
#include "bochs.h"
//////////////////////////////////////////////////////////////////////
// Missing library functions. These should work on any platform
// that needs them.
//////////////////////////////////////////////////////////////////////
#if !BX_HAVE_SNPRINTF
/* XXX use real snprintf */
/* if they don't have snprintf, just use sprintf */
int bx_snprintf (char *s, size_t maxlen, const char *format, ...)
{
va_list arg;
int done;
va_start (arg, format);
done = vsprintf (s, format, arg);
va_end (arg);
return done;
}
#endif /* !BX_HAVE_SNPRINTF */
#if !BX_HAVE_VSNPRINTF
int bx_vsnprintf (char *s, size_t maxlen, const char *format, va_list arg)
{
return vsprintf (s, format, arg);
}
#endif /* !BX_HAVE_VSNPRINTF*/
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#if (!BX_HAVE_STRTOULL && !BX_HAVE_STRTOUQ)
/* taken from glibc-2.2.2: strtod.c, and stripped down a lot. There are
still a few leftover references to decimal points and exponents,
but it works for bases 10 and 16 */
#define RETURN(val,end) \
do { if (endptr != NULL) *endptr = (char *) (end); \
return val; } while (0)
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Bit64u bx_strtoull (const char *nptr, char **endptr, int baseignore)
{
int negative; /* The sign of the number. */
int exponent; /* Exponent of the number. */
/* Numbers starting `0X' or `0x' have to be processed with base 16. */
int base = 10;
/* Number of bits currently in result value. */
int bits;
/* Running pointer after the last character processed in the string. */
const char *cp, *tp;
/* Start of significant part of the number. */
const char *startp, *start_of_digits;
/* Total number of digit and number of digits in integer part. */
int dig_no;
/* Contains the last character read. */
char c;
Bit64s n = 0;
char const *p;
/* Prepare number representation. */
exponent = 0;
negative = 0;
bits = 0;
/* Parse string to get maximal legal prefix. We need the number of
characters of the integer part, the fractional part and the exponent. */
cp = nptr - 1;
/* Ignore leading white space. */
do
c = *++cp;
while (isspace (c));
/* Get sign of the result. */
if (c == '-')
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{
negative = 1;
c = *++cp;
}
else if (c == '+')
c = *++cp;
if (c < '0' || c > '9')
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{
/* It is really a text we do not recognize. */
RETURN (0, nptr);
}
/* First look whether we are faced with a hexadecimal number. */
if (c == '0' && tolower (cp[1]) == 'x')
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{
/* Okay, it is a hexa-decimal number. Remember this and skip
the characters. BTW: hexadecimal numbers must not be
grouped. */
base = 16;
cp += 2;
c = *cp;
}
/* Record the start of the digits, in case we will check their grouping. */
start_of_digits = startp = cp;
/* Ignore leading zeroes. This helps us to avoid useless computations. */
while (c == '0')
c = *++cp;
/* If no other digit but a '0' is found the result is 0.0.
Return current read pointer. */
if ((c < '0' || c > '9')
&& (base == 16 && (c < tolower ('a') || c > tolower ('f')))
&& (base == 16 && (cp == start_of_digits || tolower (c) != 'p'))
&& (base != 16 && tolower (c) != 'e'))
{
tp = start_of_digits;
/* If TP is at the start of the digits, there was no correctly
grouped prefix of the string; so no number found. */
RETURN (0, tp == start_of_digits ? (base == 16 ? cp - 1 : nptr) : tp);
}
/* Remember first significant digit and read following characters until the
decimal point, exponent character or any non-FP number character. */
startp = cp;
dig_no = 0;
while (1)
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{
if ((c >= '0' && c <= '9')
|| (base == 16 && tolower (c) >= 'a' && tolower (c) <= 'f'))
++dig_no;
else
break;
c = *++cp;
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}
/* The whole string is parsed. Store the address of the next character. */
if (endptr)
*endptr = (char *) cp;
if (dig_no == 0)
return 0;
for (p=start_of_digits; p!=cp; p++) {
n = n * (Bit64s)base;
c = tolower (*p);
c = (c >= 'a') ? (10+c-'a') : c-'0';
n = n + (Bit64s)c;
//printf ("after shifting in digit %c, n is %lld\n", *p, n);
}
return negative? -n : n;
}
#endif /* !BX_HAVE_STRTOULL */
#if BX_TEST_STRTOULL_MAIN
/* test driver for strtoull. Do not compile by default. */
int main (int argc, char **argv)
{
char buf[256], *endbuf;
long l;
Bit64s ll;
while (1) {
printf ("Enter a long int: ");
fgets (buf, sizeof(buf), stdin);
l = strtoul (buf, &endbuf, 10);
printf ("As a long, %ld\n", l);
printf ("Endbuf is at buf[%d]\n", endbuf-buf);
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ll = bx_strtoull(buf, &endbuf, 10);
printf ("As a long long, %lld\n", ll);
printf ("Endbuf is at buf[%d]\n", endbuf-buf);
}
return 0;
}
#endif /* BX_TEST_STRTOULL_MAIN */
#if !BX_HAVE_STRDUP
/* XXX use real strdup */
char *bx_strdup(const char *s)
{
char *p = malloc (strlen (s) + 1); // allocate memory
if (p != NULL)
strcpy (p,s); // copy string
return p; // return the memory
}
#endif /* !BX_HAVE_STRDUP */
#if !BX_HAVE_STRREV
char *bx_strrev(char *str)
{
char *p1, *p2;
if (! str || ! *str)
return str;
for (p1 = str, p2 = str + strlen(str) - 1; p2 > p1; ++p1, --p2) {
*p1 ^= *p2;
*p2 ^= *p1;
*p1 ^= *p2;
}
return str;
}
#endif /* !BX_HAVE_STRREV */
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#if BX_WITH_MACOS
namespace std{extern "C" {char *mktemp(char *tpl);}}
#endif
#if !BX_HAVE_MKSTEMP
int bx_mkstemp(char *tpl)
{
mktemp(tpl);
return ::open(tpl, O_RDWR | O_CREAT | O_TRUNC
# ifdef O_BINARY
| O_BINARY
# endif
, S_IWUSR | S_IRUSR | S_IRGRP | S_IWGRP);
}
#endif // !BX_HAVE_MKSTEMP
//////////////////////////////////////////////////////////////////////
// Missing library functions, implemented for MacOS only
//////////////////////////////////////////////////////////////////////
#if BX_WITH_MACOS
// these functions are part of MacBochs. They are not intended to be
// portable!
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#include <Devices.h>
#include <Files.h>
#include <Disks.h>
int fd_read(char *buffer, Bit32u offset, Bit32u bytes)
{
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OSErr err;
IOParam param;
param.ioRefNum=-5; // Refnum of the floppy disk driver
param.ioVRefNum=1;
param.ioPosMode=fsFromStart;
param.ioPosOffset=offset;
param.ioBuffer=buffer;
param.ioReqCount=bytes;
err = PBReadSync((union ParamBlockRec *)(&param));
return param.ioActCount;
}
int fd_write(char *buffer, Bit32u offset, Bit32u bytes)
{
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OSErr err;
IOParam param;
param.ioRefNum=-5; // Refnum of the floppy disk driver
param.ioVRefNum=1;
param.ioPosMode=fsFromStart;
param.ioPosOffset=offset;
param.ioBuffer=buffer;
param.ioReqCount=bytes;
err = PBWriteSync((union ParamBlockRec *)(&param));
return param.ioActCount;
}
int fd_stat(struct stat *buf)
{
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OSErr err;
DrvSts status;
int result = 0;
err = DriveStatus(1, &status);
if (status.diskInPlace <1 || status.diskInPlace > 2)
result = -1;
buf->st_mode = S_IFCHR;
return result;
}
#endif /* BX_WITH_MACOS */
//////////////////////////////////////////////////////////////////////
// Missing library functions, implemented for MorphOS only
//////////////////////////////////////////////////////////////////////
#ifdef __MORPHOS__
#include <stdio.h>
#include <time.h>
typedef unsigned int u_int32_t;
typedef unsigned short u_int16_t;
typedef unsigned char u_int8_t;
int fseeko(FILE *stream, off_t offset, int whence)
{
while(offset != (long) offset)
{
long pos = (offset < 0) ? LONG_MIN : LONG_MAX;
if(fseek(stream, pos, whence) != 0)
return -1;
offset -= pos;
whence = SEEK_CUR;
}
return fseek(stream, (long) offset, whence);
}
struct tm *localtime_r(const time_t *timep, struct tm *result)
{
struct tm *s = localtime(timep);
if(s == NULL)
return NULL;
*result = *s;
return(result);
}
#endif
//////////////////////////////////////////////////////////////////////
// New functions to replace library functions
// with OS-independent versions
//////////////////////////////////////////////////////////////////////
#if BX_HAVE_REALTIME_USEC
#if defined(WIN32)
static Bit64u last_realtime64_top = 0;
static Bit64u last_realtime64_bottom = 0;
Bit64u bx_get_realtime64_usec(void)
{
Bit64u new_bottom = ((Bit64u) GetTickCount()) & BX_CONST64(0x0FFFFFFFF);
if(new_bottom < last_realtime64_bottom) {
last_realtime64_top += BX_CONST64(0x0000000100000000);
}
last_realtime64_bottom = new_bottom;
Bit64u interim_realtime64 =
(last_realtime64_top & BX_CONST64(0xFFFFFFFF00000000)) |
(new_bottom & BX_CONST64(0x00000000FFFFFFFF));
return interim_realtime64*(BX_CONST64(1000));
}
#elif BX_HAVE_GETTIMEOFDAY
Bit64u bx_get_realtime64_usec(void)
{
timeval thetime;
gettimeofday(&thetime,0);
Bit64u mytime;
mytime=(Bit64u)thetime.tv_sec*(Bit64u)1000000+(Bit64u)thetime.tv_usec;
return mytime;
}
#endif
#endif