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gzdoom/src/c_expr.cpp
Randy Heit fb50df2c63 About a week's worth of changes here. As a heads-up, I wouldn't be 
surprised if this doesn't build in Linux right now. The CMakeLists.txt
were checked with MinGW and NMake, but how they fair under Linux is an
unknown to me at this time.

- Converted most sprintf (and all wsprintf) calls to either mysnprintf or
  FStrings, depending on the situation.
- Changed the strings in the wbstartstruct to be FStrings.
- Changed myvsnprintf() to output nothing if count is greater than INT_MAX.
  This is so that I can use a series of mysnprintf() calls and advance the
  pointer for each one. Once the pointer goes beyond the end of the buffer,
  the count will go negative, but since it's an unsigned type it will be
  seen as excessively huge instead. This should not be a problem, as there's
  no reason for ZDoom to be using text buffers larger than 2 GB anywhere.
- Ripped out the disabled bit from FGameConfigFile::MigrateOldConfig().
- Changed CalcMapName() to return an FString instead of a pointer to a static
  buffer.
- Changed startmap in d_main.cpp into an FString.
- Changed CheckWarpTransMap() to take an FString& as the first argument.
- Changed d_mapname in g_level.cpp into an FString.
- Changed DoSubstitution() in ct_chat.cpp to place the substitutions in an
  FString.
- Fixed: The MAPINFO parser wrote into the string buffer to construct a map
  name when given a Hexen map number. This was fine with the old scanner
  code, but only a happy coincidence prevents it from crashing with the new
  code
- Added the 'B' conversion specifier to StringFormat::VWorker() for printing
  binary numbers.
- Added CMake support for building with MinGW, MSYS, and NMake. Linux support
  is probably broken until I get around to booting into Linux again. Niceties
  provided over the existing Makefiles they're replacing:
  * All command-line builds can use the same build system, rather than having
    a separate one for MinGW and another for Linux.
  * Microsoft's NMake tool is supported as a target.
  * Progress meters.
  * Parallel makes work from a fresh checkout without needing to be primed
    first with a single-threaded make.
  * Porting to other architectures should be simplified, whenever that day
    comes.
- Replaced the makewad tool with zipdir. This handles the dependency tracking
  itself instead of generating an external makefile to do it, since I couldn't
  figure out how to generate a makefile with an external tool and include it
  with a CMake-generated makefile. Where makewad used a master list of files
  to generate the package file, zipdir just zips the entire contents of one or
  more directories.
- Added the gdtoa package from netlib's fp library so that ZDoom's printf-style
  formatting can be entirely independant of the CRT.

SVN r1082 (trunk)
2008-07-23 04:57:26 +00:00

811 lines
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/*
** c_expr.cpp
** Console commands dealing with mathematical expressions
**
**---------------------------------------------------------------------------
** Copyright 1998-2006 Randy Heit
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
// HEADER FILES ------------------------------------------------------------
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include "c_dispatch.h"
#include "c_cvars.h"
// MACROS ------------------------------------------------------------------
// TYPES -------------------------------------------------------------------
enum EProductionType
{
PROD_String, PROD_Double
};
struct FProduction
{
EProductionType Type;
};
struct FStringProd : public FProduction
{
char Value[1];
};
struct FDoubleProd : public FProduction
{
double Value;
};
struct FProducer
{
char Token[4];
FProduction *(*DoubleProducer) (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *(*StringProducer) (FStringProd *prod1, FStringProd *prod2);
};
// EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
// PUBLIC FUNCTION PROTOTYPES ----------------------------------------------
bool IsFloat (const char *str);
// PRIVATE FUNCTION PROTOTYPES ---------------------------------------------
static FProduction *ParseExpression (FCommandLine &argv, int &parsept);
static const char *IsNum (const char *str);
static FStringProd *NewStringProd (const char *str);
static FStringProd *NewStringProd (size_t len);
static FDoubleProd *NewDoubleProd (double val);
static FStringProd *DoubleToString (FProduction *prod);
static FDoubleProd *StringToDouble (FProduction *prod);
void MaybeStringCoerce (FProduction *&prod1, FProduction *&prod2);
void MustStringCoerce (FProduction *&prod1, FProduction *&prod2);
void DoubleCoerce (FProduction *&prod1, FProduction *&prod2);
FProduction *ProdAddDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdAddStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdSubDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdMulDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdDivDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdModDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdPowDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdLTDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdLTEDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdGTDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdGTEDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdEqDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdNeqDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdXorDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdAndDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdOrDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdLAndDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdLOrDbl (FDoubleProd *prod1, FDoubleProd *prod2);
FProduction *ProdLTStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdLTEStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdGTStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdGTEStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdEqStr (FStringProd *prod1, FStringProd *prod2);
FProduction *ProdNeqStr (FStringProd *prod1, FStringProd *prod2);
// EXTERNAL DATA DECLARATIONS ----------------------------------------------
// PUBLIC DATA DEFINITIONS -------------------------------------------------
// PRIVATE DATA DEFINITIONS ------------------------------------------------
static FProducer Producers[] =
{
{ "+", ProdAddDbl, ProdAddStr },
{ "-", ProdSubDbl, NULL },
{ "*", ProdMulDbl, NULL },
{ "/", ProdDivDbl, NULL },
{ "%", ProdModDbl, NULL },
{ "^", ProdPowDbl, NULL },
{ "<", ProdLTDbl, ProdLTStr },
{ "<=", ProdLTEDbl, ProdLTEStr },
{ ">", ProdGTDbl, ProdGTStr },
{ ">=", ProdGTEDbl, ProdGTEStr },
{ "=", ProdEqDbl, ProdEqStr },
{ "==", ProdEqDbl, ProdEqStr },
{ "!=", ProdNeqDbl, ProdNeqStr },
{ "<>", ProdNeqDbl, ProdNeqStr },
{ "xor", ProdXorDbl, NULL },
{ "&", ProdAndDbl, NULL },
{ "|", ProdOrDbl, NULL },
{ "&&", ProdLAndDbl, NULL },
{ "||", ProdLOrDbl, NULL }
};
// CODE --------------------------------------------------------------------
//==========================================================================
//
// ParseExpression
//
// Builds a production from an expression. The supported syntax is LISP-like
// but without parentheses.
//
//==========================================================================
static FProduction *ParseExpression (FCommandLine &argv, int &parsept)
{
if (parsept >= argv.argc())
return NULL;
const char *token = argv[parsept++];
FProduction *prod1 = NULL, *prod2 = NULL, *prod3 = NULL;
if (IsFloat (token))
{
return NewDoubleProd (atof(token));
}
else if (stricmp (token, "true") == 0)
{
return NewDoubleProd (1.0);
}
else if (stricmp (token, "false") == 0)
{
return NewDoubleProd (0.0);
}
else
{
for (size_t i = 0; i < countof(Producers); ++i)
{
if (strcmp (Producers[i].Token, token) == 0)
{
prod1 = ParseExpression (argv, parsept);
prod2 = ParseExpression (argv, parsept);
if (prod1 == NULL || prod2 == NULL)
{
goto missing;
}
if (Producers[i].StringProducer == NULL)
{
DoubleCoerce (prod1, prod2);
}
else if (Producers[i].DoubleProducer == NULL)
{
MustStringCoerce (prod1, prod2);
}
else
{
MaybeStringCoerce (prod1, prod2);
}
if (prod1->Type == PROD_String)
{
prod3 = Producers[i].StringProducer ((FStringProd *)prod1, (FStringProd *)prod2);
}
else
{
prod3 = Producers[i].DoubleProducer ((FDoubleProd *)prod1, (FDoubleProd *)prod2);
}
goto done;
}
}
if (strcmp ("!", token) == 0)
{
prod1 = ParseExpression (argv, parsept);
if (prod1 == NULL)
{
goto missing;
}
if (prod1->Type == PROD_String)
{
prod1 = StringToDouble (prod1);
}
prod3 = NewDoubleProd (!static_cast<FDoubleProd *>(prod1)->Value);
goto done;
}
return NewStringProd (token);
}
missing:
Printf ("Missing argument to %s\n", token);
done:
if (prod2 != NULL) M_Free (prod2);
if (prod1 != NULL) M_Free (prod1);
return prod3;
}
//==========================================================================
//
// IsFloat
//
//==========================================================================
bool IsFloat (const char *str)
{
const char *pt;
if (*str == '+' || *str == '-')
str++;
if (*str == '.')
{
pt = str;
}
else
{
pt = IsNum (str);
if (pt == NULL)
return false;
}
if (*pt == '.')
{
pt = IsNum (pt+1);
if (pt == NULL)
return false;
}
if (*pt == 'e' || *pt == 'E')
{
pt++;
if (*pt == '+' || *pt == '-')
pt++;
pt = IsNum (pt);
}
return pt != NULL && *pt == 0;
}
//==========================================================================
//
// IsNum
//
//==========================================================================
static const char *IsNum (const char *str)
{
const char *start = str;
while (*str)
{
if (*str >= '0' && *str <= '9')
str++;
else
break;
}
return (str > start) ? str : NULL;
}
//==========================================================================
//
// NewStringProd (from a string)
//
//==========================================================================
static FStringProd *NewStringProd (const char *str)
{
FStringProd *prod = (FStringProd *)M_Malloc (sizeof(FStringProd)+strlen(str));
prod->Type = PROD_String;
strcpy (prod->Value, str);
return prod;
}
//==========================================================================
//
// NewStringProd (from a length)
//
//==========================================================================
static FStringProd *NewStringProd (size_t len)
{
FStringProd *prod = (FStringProd *)M_Malloc (sizeof(FStringProd)+len);
prod->Type = PROD_String;
prod->Value[0] = 0;
return prod;
}
//==========================================================================
//
// NewDoubleProd
//
//==========================================================================
static FDoubleProd *NewDoubleProd (double val)
{
FDoubleProd *prod = (FDoubleProd *)M_Malloc (sizeof(FDoubleProd));
prod->Type = PROD_Double;
prod->Value = val;
return prod;
}
//==========================================================================
//
// DoubleToString
//
//==========================================================================
static FStringProd *DoubleToString (FProduction *prod)
{
char buf[128];
FStringProd *newprod;
mysnprintf (buf, countof(buf), "%g", static_cast<FDoubleProd *>(prod)->Value);
newprod = NewStringProd (buf);
M_Free (prod);
return newprod;
}
//==========================================================================
//
// StringToDouble
//
//==========================================================================
static FDoubleProd *StringToDouble (FProduction *prod)
{
FDoubleProd *newprod;
newprod = NewDoubleProd (atof (static_cast<FStringProd *>(prod)->Value));
M_Free (prod);
return newprod;
}
//==========================================================================
//
// MaybeStringCoerce
//
// If one of the parameters is a string, convert the other to a string.
//
//==========================================================================
void MaybeStringCoerce (FProduction *&prod1, FProduction *&prod2)
{
if (prod1->Type == PROD_String)
{
if (prod2->Type == PROD_Double)
{
prod2 = DoubleToString (prod2);
}
}
else if (prod2->Type == PROD_String)
{
prod1 = DoubleToString (prod1);
}
}
//==========================================================================
//
// MustStringCoerce
//
// Ensures that both parameters are strings
//
//==========================================================================
void MustStringCoerce (FProduction *&prod1, FProduction *&prod2)
{
if (prod1->Type == PROD_Double)
{
prod1 = DoubleToString (prod1);
}
if (prod2->Type == PROD_Double)
{
prod2 = DoubleToString (prod2);
}
}
//==========================================================================
//
// DoubleCoerce
//
// Ensures that both parameters are doubles
//
//==========================================================================
void DoubleCoerce (FProduction *&prod1, FProduction *&prod2)
{
if (prod1->Type == PROD_String)
{
prod1 = StringToDouble (prod1);
}
if (prod2->Type == PROD_String)
{
prod2 = StringToDouble (prod2);
}
}
//==========================================================================
//
// ProdAddDbl
//
//==========================================================================
FProduction *ProdAddDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value + prod2->Value);
}
//==========================================================================
//
// ProdAddStr
//
//==========================================================================
FProduction *ProdAddStr (FStringProd *prod1, FStringProd *prod2)
{
size_t len = strlen (prod1->Value) + strlen (prod2->Value) + 1;
FStringProd *prod = NewStringProd (len);
strcpy (prod->Value, prod1->Value);
strcat (prod->Value, prod2->Value);
return prod;
}
//==========================================================================
//
// ProdSubDbl
//
//==========================================================================
FProduction *ProdSubDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value - prod2->Value);
}
//==========================================================================
//
// ProdMulDbl
//
//==========================================================================
FProduction *ProdMulDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value * prod2->Value);
}
//==========================================================================
//
// ProdDivDbl
//
//==========================================================================
FProduction *ProdDivDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value / prod2->Value);
}
//==========================================================================
//
// ProdModDbl
//
//==========================================================================
FProduction *ProdModDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (fmod (prod1->Value, prod2->Value));
}
//==========================================================================
//
// ProdPowDbl
//
//==========================================================================
FProduction *ProdPowDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (pow (prod1->Value, prod2->Value));
}
//==========================================================================
//
// ProdLTDbl
//
//==========================================================================
FProduction *ProdLTDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value < prod2->Value);
}
//==========================================================================
//
// ProdLTEDbl
//
//==========================================================================
FProduction *ProdLTEDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value <= prod2->Value);
}
//==========================================================================
//
// ProdGTDbl
//
//==========================================================================
FProduction *ProdGTDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value > prod2->Value);
}
//==========================================================================
//
// ProdGTEDbl
//
//==========================================================================
FProduction *ProdGTEDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value >= prod2->Value);
}
//==========================================================================
//
// ProdEqDbl
//
//==========================================================================
FProduction *ProdEqDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value == prod2->Value);
}
//==========================================================================
//
// ProdNeqDbl
//
//==========================================================================
FProduction *ProdNeqDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd (prod1->Value != prod2->Value);
}
//==========================================================================
//
// ProdLTStr
//
//==========================================================================
FProduction *ProdLTStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) < 0);
}
//==========================================================================
//
// ProdLTEStr
//
//==========================================================================
FProduction *ProdLTEStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) <= 0);
}
//==========================================================================
//
// ProdGTStr
//
//==========================================================================
FProduction *ProdGTStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) > 0);
}
//==========================================================================
//
// ProdGTEStr
//
//==========================================================================
FProduction *ProdGTEStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) >= 0);
}
//==========================================================================
//
// ProdEqStr
//
//==========================================================================
FProduction *ProdEqStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) == 0);
}
//==========================================================================
//
// ProdNeqStr
//
//==========================================================================
FProduction *ProdNeqStr (FStringProd *prod1, FStringProd *prod2)
{
return NewDoubleProd (stricmp (prod1->Value, prod2->Value) != 0);
}
//==========================================================================
//
// ProdXorDbl
//
//==========================================================================
FProduction *ProdXorDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd ((double)((SQWORD)prod1->Value ^ (SQWORD)prod2->Value));
}
//==========================================================================
//
// ProdAndDbl
//
//==========================================================================
FProduction *ProdAndDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd ((double)((SQWORD)prod1->Value & (SQWORD)prod2->Value));
}
//==========================================================================
//
// ProdOrDbl
//
//==========================================================================
FProduction *ProdOrDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd ((double)((SQWORD)prod1->Value | (SQWORD)prod2->Value));
}
//==========================================================================
//
// ProdLAndDbl
//
//==========================================================================
FProduction *ProdLAndDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd ((double)((SQWORD)prod1->Value && (SQWORD)prod2->Value));
}
//==========================================================================
//
// ProdLOrDbl
//
//==========================================================================
FProduction *ProdLOrDbl (FDoubleProd *prod1, FDoubleProd *prod2)
{
return NewDoubleProd ((double)((SQWORD)prod1->Value || (SQWORD)prod2->Value));
}
//==========================================================================
//
//
//
//==========================================================================
//==========================================================================
//
// CCMD test
//
// If <expr> is non-zero, execute <true cmd>.
// If <expr> is zero, execute [false cmd] if specified.
//
//==========================================================================
CCMD (test)
{
int parsept = 1;
FProduction *prod = ParseExpression (argv, parsept);
if (prod == NULL || parsept >= argv.argc())
{
Printf ("Usage: test <expr> <true cmd> [false cmd]\n");
}
else
{
if (prod->Type == PROD_String)
{
prod = StringToDouble (prod);
}
if (static_cast<FDoubleProd *>(prod)->Value != 0.0)
{
AddCommandString (argv[parsept]);
}
else if (++parsept < argv.argc())
{
AddCommandString (argv[parsept]);
}
}
if (prod != NULL)
{
M_Free (prod);
}
}
//==========================================================================
//
// CCMD eval
//
// Evaluates an expression and either prints it to the console or stores
// it in an existing cvar.
//
//==========================================================================
CCMD (eval)
{
if (argv.argc() >= 2)
{
int parsept = 1;
FProduction *prod = ParseExpression (argv, parsept);
if (prod != NULL)
{
if (parsept < argv.argc())
{
FBaseCVar *var = FindCVar (argv[parsept], NULL);
if (var == NULL)
{
Printf ("Unknown variable %s\n", argv[parsept]);
}
else
{
UCVarValue val;
if (prod->Type == PROD_Double)
{
val.Float = (float)static_cast<FDoubleProd *>(prod)->Value;
var->SetGenericRep (val, CVAR_Float);
}
else
{
val.String = static_cast<FStringProd *>(prod)->Value;
var->SetGenericRep (val, CVAR_String);
}
}
}
else
{
if (prod->Type == PROD_Double)
{
Printf ("%g\n", static_cast<FDoubleProd *>(prod)->Value);
}
else
{
Printf ("%s\n", static_cast<FStringProd *>(prod)->Value);
}
}
M_Free (prod);
return;
}
}
Printf ("Usage: eval <expression> [variable]\n");
}
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