Fix 2000/thadgavin for SDL + format README.md

The SDL version did not work for a number of reasons. First of all the
code requires that SDL is defined. Second the path wrong header file was
included. Third the SDL1 developers thought it would be a great idea
(but obviously it's a terrible idea) to redefine main() (!!) so that any
program that uses SDL1 has to have the same args as their definition.
This program had 'main()' so the error message was:

    thadgavin.c:60:1: error: conflicting types for 'SDL_main'
    main()
    ^
    /opt/local/include/SDL/SDL_main.h:34:14: note: expanded from macro 'main'
    #define main SDL_main
		 ^
    /opt/local/include/SDL/SDL_main.h:35:12: note: previous declaration is here
    extern int SDL_main(int argc, char *argv[]);
	       ^
    1 warning and 1 error generated.
    make: *** [thadgavin_sdl] Error 1

Thus main() was changed to 'int main(int argc, char **argv)'. I am not
sure if I want to know their thinking. I kind of do but I also don't.

Format fix README.md.

2000/thadgavin/Makefile

@@ -129,8 +129,12 @@ all: data ${TARGET}
 	supernova deep_magic magic charon pluto
 
 ${PROG}: ${PROG}.c
+	@echo "WARNING: if you are sensitive to rapid movement you should probably avoid this entry."
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
 
+${PROG}_sdl: ${PROG}.c
+	${CC} ${CFLAGS} -DSDL `${SDL1_CONFIG} --cflags` $< -o $@ ${LIBS} `${SDL1_CONFIG} --libs`
+
 # alternative executable
 #
 alt: data ${ALT_TARGET}

2000/thadgavin/README.md

@@ -1,16 +1,16 @@
 # Most Portable Output
 
-    Thaddaeus Frogley
+Thaddaeus Frogley  
-    Creature Labs
+Creature Labs  
-    164 Hornbeams,
+164 Hornbeams  
-    Harlow, Essex,
+Harlow, Essex  
-    UK
+UK  
-
+  
-    Gavin Buttimore
+Gavin Buttimore  
-    Creature Labs
+Creature Labs  
-    9 Elizabeth Way,
+9 Elizabeth Way   
-    Cambridge,
+Cambridge   
-    UK, CB4 1DE
+UK, CB4 1DE  
 
 ## To build:
 
@@ -18,12 +18,37 @@
 make
 ```
 
+NOTE: the author suggested `-O6` but at least some gcc versions support no more
+than level 3 which is what the Makefile has.
+
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed the code and
+added an appropriate make rule so that the SDL version works independent from
+the curses version (using the same code). To use it:
+
+
+```sh
+make thadgavin_sdl
+```
+
+Use `thadgavin_sdl` as you would `thadgavin` below.
+
+Thank you Cody for your assistance!
+
+
 ## To run:
 
 ```sh
 ./thadgavin
 ```
 
+WARNING: if you are sensitive to rapid movement you should probably avoid
+this entry, both the SDL version and the curses version.
+
+NOTE: in curses mode you might want to type `reset` after execution of this
+program as the program does not call `endwin()`. Using `reset` will clear the
+screen.
+
+
 ## Try:
 
 ```sh
@@ -37,45 +62,49 @@ SDL graphic library is not present, and is quite good at that,
 but the colors used in graphic mode (16 bit depth) are unfortunately
 less than dazzling. We could not test this entry in DOS mode.
 
-## Author's remarks:
+## Authors' remarks:
 
-To run under DOS:
+### To run under DOS:
 
-    Compile using DJGPP as follows:
+Compile using DJGPP as follows:
 
-    gcc thadgavin.c -o thadgavin.exe -Wall -lm -O6 -mpentium -fomit-frame-pointer
+```sh
--ffast-math
+gcc thadgavin.c -o thadgavin.exe -Wall -lm -O6 -mpentium -fomit-frame-pointer -ffast-math
+```
 
-To run under Windows, X-Windows or MacOS using the
+### To run under Windows, X-Windows or MacOS using the Simple DirectMedia Layer:
-Simple DirectMedia Layer:
 
-    For example:
+```sh
-
+gcc -O6 -lpthread -g -o thadgavin thadgavin.c -lSDL -DSDL -lm
-    gcc -O6 -lpthread -g -o thadgavin thadgavin.c -lSDL -DSDL -lm
+```
 
 
-In gcc you may get the following warning:
+### Warnings
 
-    prog.c:46: warning: passing arg 2 of `SDL_SetColors' from incompatible
+In gcc you might get the following warning:
-    pointer type
+
+```
+thadgavin.c.c:46: warning: passing arg 2 of `SDL_SetColors' from incompatible pointer type
+```
 
 In Microsoft Visual Studio you may get warnings as follows:
 
-    prog.c(46) : warning C4133: 'function' : incompatible types - from 'unsigned
+```
-    char *' to 'struct SDL_Color *'
+thadgavin.c(46) : warning C4133: 'function' : incompatible types - from 'unsigned
-    prog.c(63) : warning C4026: function declared with formal parameter list
+char *' to 'struct SDL_Color *'
-    prog.c(77) : warning C4244: '=' : conversion from 'double ' to 'unsigned
+thadgavin.c(63) : warning C4026: function declared with formal parameter list
-    char ', possible loss of data
+thadgavin.c(77) : warning C4244: '=' : conversion from 'double ' to 'unsigned
+char ', possible loss of data
 
+```
 
 But don't worry, this is completely normal.
 
 Recommended dosage:
 
-    At least 3 minutes taken 3 times a day when tired.
+At least 3 minutes taken 3 times a day when tired.
 
-    Do not exceed 3 times recommended dose.  May cause
+Do not exceed 3 times recommended dose.  May cause sickness, dizziness, nausea.
-    sickness, dizziness, nausea.
 
 ## Copyright and CC BY-SA 4.0 License:
 

2000/thadgavin/thadgavin.c

@@ -38,7 +38,7 @@
    (v,X*Y,0xA0000   ); } else{       r.x.ax=
  0x13;            __dpmi_int(    0x10,&r); } }
                    #elif defined(SDL)
-              #include "SDL/SDL.h"
+              #include <SDL.h>
           SDL_Surface    *s; void
          F(int i){ if   (i){ SDL_SetColors(
      s,h,0,256);         SDL_UpdateRect
@@ -57,7 +57,7 @@
          LINES      &~1,Y=y<Y?y:Y; } }
           #endif
 
-main()
+main(int argc, char **argv)
 {
     F(0);