From af2d6ceb65e9c209d3f102829521cb64543b559d Mon Sep 17 00:00:00 2001
From: sireus <sireus@users.souceforge.net>
Date: Fri, 14 Sep 2012 21:36:28 +0000
Subject: [PATCH] div=, div=f

git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@6876 e016b1c5-ed68-44aa-a2f7-31cac88cffde
---
 docs/reference.xml     | 177 ++++++++++++++++++++++++++++-------------
 source/src/command.cpp |   8 +-
 2 files changed, 127 insertions(+), 58 deletions(-)

diff --git a/docs/reference.xml b/docs/reference.xml
index a45a966c..1952feab 100644
--- a/docs/reference.xml
+++ b/docs/reference.xml
@@ -219,6 +219,69 @@
 					<return token="N" description="the sum"/>
 				</command>
 
+				<command name="-">
+					<description>Performs a subtraction.</description>
+					<arguments>
+						<argument token="A" description="the minuend"/>
+						<argument token="B" description="the subtrahend"/>
+					</arguments>
+					<return token="N" description="the difference"/>
+				</command>
+
+				<command name="*">
+					<description>Performs a multiplication.</description>
+					<arguments>
+						<argument token="A" description="the multiplicand"/>
+						<argument token="B" description="the multiplier"/>
+					</arguments>
+					<return token="N" description="the product"/>
+				</command>
+
+				<command name="div">
+					<description>Performs an integer division.</description>
+					<arguments>
+						<argument token="A" description="the dividend"/>
+						<argument token="B" description="the divisor"/>
+					</arguments>
+					<return token="N" description="the quotient (integer)"/>
+				</command>
+
+				<command name="-f">
+					<description>Subtracts two floating-point numbers.</description>
+					<arguments>
+						<argument token="A" description="the minuend" valueNotes="float"/>
+						<argument token="B" description="the subtrahend" valueNotes="float"/>
+					</arguments>
+					<return token="F" description="the difference"/>
+				</command>
+
+				<command name="+f">
+					<description>Adds up two floating-point numbers.</description>
+					<arguments>
+						<argument token="A" description="the first summand" valueNotes="float"/>
+						<argument token="B" description="the second summand" valueNotes="float"/>
+					</arguments>
+					<return token="F" description="the sum"/>
+				</command>
+
+				<command name="*f">
+					<description>Performs a floating point multiplication.</description>
+					<arguments>
+						<argument token="A" description="the multiplicand"/>
+						<argument token="B" description="the multiplier"/>
+					</arguments>
+					<return token="N" description="the product"/>
+				</command>
+
+				<command name="divf">
+					<description>Performs a division with floating-point precision.</description>
+					<arguments>
+						<argument token="A" description="" valueNotes="the dividend"/>
+						<argument token="B" description="" valueNotes="the divisor"/>
+					</arguments>
+					<return token="F" description="the quotient (floating-point)"/>
+				</command>
+
 				<command name="+=">
 					<description>Adds a value to an alias.</description>
 					<remarks>
@@ -246,70 +309,81 @@
 				</command>
 
 				<command name="*=">
-					<description>Multiplies a value and an alias.</description>
+					<description>Multiplies an alias by a value.</description>
 					<remarks>
 					<remark>
 						Example: *= foo 1337
 					</remark>
 					</remarks>
 					<arguments>
-						<argument token="A" description="the alias to multiplied"/>
+						<argument token="A" description="the alias to be multiplied"/>
 						<argument token="B" description="the multiplier"/>
 					</arguments>
 				</command>
 
-				<command name="-">
-					<description>Performs a subtraction.</description>
+				<command name="div=">
+					<description>Divides an alias by a value.</description>
+					<remarks>
+					<remark>
+						Example: div= foo 1337
+					</remark>
+					</remarks>
 					<arguments>
-						<argument token="A" description="the minuend"/>
-						<argument token="B" description="the subtrahend"/>
-					</arguments>
-					<return token="N" description="the difference"/>
-				</command>
-
-				<command name="-f">
-					<description>Subtracts two floating-point numbers.</description>
-					<arguments>
-						<argument token="A" description="the minuend" valueNotes="float"/>
-						<argument token="B" description="the subtrahend" valueNotes="float"/>
-					</arguments>
-					<return token="F" description="the difference"/>
-				</command>
-
-				<command name="+f">
-					<description>Adds up two floating-point numbers.</description>
-					<arguments>
-						<argument token="A" description="the first summand" valueNotes="float"/>
-						<argument token="B" description="the second summand" valueNotes="float"/>
-					</arguments>
-					<return token="F" description="the sum"/>
-				</command>
-
-				<command name="*">
-					<description>Performs a multiplication.</description>
-					<arguments>
-						<argument token="A" description="the multiplicand"/>
-						<argument token="B" description="the multiplier"/>
-					</arguments>
-					<return token="N" description="the product"/>
-				</command>
-
-				<command name="div">
-					<description>Performs an integer division.</description>
-					<arguments>
-						<argument token="A" description="the dividend"/>
+						<argument token="A" description="the alias to be divided"/>
 						<argument token="B" description="the divisor"/>
 					</arguments>
-					<return token="N" description="the quotient (integer)"/>
 				</command>
 
-				<command name="divf">
-					<description>Performs a division with floating-point precision.</description>
+				<command name="+=f">
+					<description>Adds a floating-point value to an alias.</description>
+					<remarks>
+					<remark>
+						Example: +=f foo 13.37
+					</remark>
+					</remarks>
 					<arguments>
-						<argument token="A" description="" valueNotes="the dividend"/>
-						<argument token="B" description="" valueNotes="the divisor"/>
+						<argument token="A" description="the alias to add to"/>
+						<argument token="B" description="value to be added"/>
+					</arguments>
+				</command>
+
+				<command name="-=f">
+					<description>Subtracts a floating-point value from an alias.</description>
+					<remarks>
+					<remark>
+						Example: -=f foo 13.37
+					</remark>
+					</remarks>
+					<arguments>
+						<argument token="A" description="the alias to subtract from"/>
+						<argument token="B" description="value to be subtracted"/>
+					</arguments>
+				</command>
+
+				<command name="*=f">
+					<description>Multiplies an alias by a floating-point value.</description>
+					<remarks>
+					<remark>
+						Example: *=f foo 13.37
+					</remark>
+					</remarks>
+					<arguments>
+						<argument token="A" description="the alias to be multiplied"/>
+						<argument token="B" description="the multiplier"/>
+					</arguments>
+				</command>
+
+				<command name="div=f">
+					<description>Divides an alias by a floating-point value.</description>
+					<remarks>
+					<remark>
+						Example: div=f foo 13.37
+					</remark>
+					</remarks>
+					<arguments>
+						<argument token="A" description="the alias to be divided"/>
+						<argument token="B" description="the divisor"/>
 					</arguments>
-					<return token="F" description="the quotient (floating-point)"/>
 				</command>
 
 				<command name="mod">
@@ -428,15 +502,6 @@
 					</arguments>
 				</command>
 
-				<command name="*f">
-					<description>Performs a floating point multiplication.</description>
-					<arguments>
-						<argument token="A" description="the multiplicand"/>
-						<argument token="B" description="the multiplier"/>
-					</arguments>
-					<return token="N" description="the product"/>
-				</command>
-
 				<command name="rnd">
 					<description>Random value</description>
 					<arguments>
diff --git a/source/src/command.cpp b/source/src/command.cpp
index b941fcc0..31e002da 100644
--- a/source/src/command.cpp
+++ b/source/src/command.cpp
@@ -266,7 +266,7 @@ void modifyvar(const char *name, const char *arg, char op)
         case '+': val += argval; break;
         case '-': val -= argval; break;
         case '*': val *= argval; break;
-        case '/': val /= argval; break;
+        case '/': val = argval ? val/argval : 0; break;
     }
     switch(id->type)
     {
@@ -303,7 +303,7 @@ void modifyfvar(const char *name, const char *arg, char op)
         case '+': val += argval; break;
         case '-': val -= argval; break;
         case '*': val *= argval; break;
-        case '/': val /= argval; break;
+        case '/': val = (argval == 0.0f) ? 0 : val/argval; break;
     }
     switch(id->type)
     {
@@ -319,16 +319,20 @@ void modifyfvar(const char *name, const char *arg, char op)
 void addeq(char *name, char *arg) { modifyvar(name, arg, '+'); }
 void subeq(char *name, char *arg) { modifyvar(name, arg, '-'); }
 void muleq(char *name, char *arg) { modifyvar(name, arg, '*'); }
+void diveq(char *name, char *arg) { modifyvar(name, arg, '/'); }
 void addeqf(char *name, char *arg) { modifyfvar(name, arg, '+'); }
 void subeqf(char *name, char *arg) { modifyfvar(name, arg, '-'); }
 void muleqf(char *name, char *arg) { modifyfvar(name, arg, '*'); }
+void diveqf(char *name, char *arg) { modifyfvar(name, arg, '/'); }
 
 COMMANDN(+=, addeq, ARG_2STR);
 COMMANDN(-=, subeq, ARG_2STR);
 COMMANDN(*=, muleq, ARG_2STR);
+COMMANDN(div=, diveq, ARG_2STR);
 COMMANDN(+=f, addeqf, ARG_2STR);
 COMMANDN(-=f, subeqf, ARG_2STR);
 COMMANDN(*=f, muleqf, ARG_2STR);
+COMMANDN(div=f, diveqf, ARG_2STR);
 
 int getvar(const char *name)
 {