Fix 2019/karns

A strange problem is that although it worked with macOS and linux for me
numerous times in the past it stopped working under both. I went to try
and figure it out but when disabling the optimiser for debug symbols the
problem vanished. Changing it back to -O3 and the problem reappeared
both with macOS and linux. Thus it appears that the entry should not
have -O level > 0. I'm not sure if this is the same issue the author
reported where it sometimes segfaults but I did not try and figure it
out either (in any event the crash disappeared when -O0 was specified so
it'd be harder to debug).

Added to .gitignore the file the author noted the program is called (as
the command he gives creates). To make it easier I just made it a
symlink to prog.

Fixed formatting in README.md.

2019/karns/.gitignore

@@ -1 +1,2 @@
 prog
+tbfs

2019/karns/Makefile

@@ -68,7 +68,7 @@ CINCLUDE=
 
 # Optimization
 #
-OPT= -O3
+OPT= 
 
 # Default flags for ANSI C compilation
 #
@@ -120,6 +120,10 @@ TARGET= ${PROG}
 ALT_OBJ=
 ALT_TARGET=
 
+############################
+# FORCE no -O level        #
+# ##########################
+COPT+= -O0
 
 #################
 # build the entry
@@ -134,6 +138,11 @@ all: data ${TARGET}
 
 ${PROG}: ${PROG}.c
 	${CC} ${CFLAGS} $< -o $@ ${LIBS}
+	${LN} -sf ${PROG} tbfs
+
+test: prog
+	${CAT} prog.c | ./prog
+
 
 # alternative executable
 #

2019/karns/README.md

@@ -1,7 +1,7 @@
 # Most in need of whitespace
 
-    Joshua Karns  
+Joshua Karns  
-    Twitter: @jkarnss  
+Twitter: @jkarnss  
 
 ## To build:
 
@@ -15,6 +15,14 @@ make
 ./prog < textfile_that_fits_on_the_screen
 ```
 
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) reported that with `-O`
+level > 0 this program segfaults (sometimes?). He's not sure why as it worked
+fine before on the same systems tested but `-O0` appears to fix the problem in
+both macOS and linux. Perhaps this is the problem that the author reported where
+it sometimes segfaults but Cody did not try debugging it. Thank you Cody for
+your assistance!
+
+
 ## Try:
 
 ```sh
@@ -34,21 +42,24 @@ the terminal, like:
 
 ## Judges' comments:
 
-If you typically get lost in mazes, watching this program run might -- or might not, YMMV --
+If you typically get lost in mazes, watching this program run might -- or might
-teach you how to find your way in a maze. The algorithm is well-known but the drawing is amazing!
+not, YMMV -- teach you how to find your way in a maze. The algorithm is
+well-known but the drawing is amazing!
 
-Before running, make sure that your terminal can accommodate the whole file. Before running "make test",
+Before running, make sure that your terminal can accommodate the whole file.
-make it about 120x40 to be safe, ensuring that you see the @ sign as well as the exclamation mark.
+Before running "make test", make it about 120x40 to be safe, ensuring that you
+see the @ sign as well as the exclamation mark.
 
 ...Oh, and the first M in YMMV stands for "mazing".
 
-A puzzle for the reader: Can you change the program to consider a diagonal movement as one step?
+A puzzle for the reader: Can you change the program to consider a diagonal
+movement as one step?
 
 ## Author's comments:
 
-### The Program
+### The Program:
                                 
-This program is pretty simple! It performs a breadth  first search on the
+This program is pretty simple! It performs a breadth first search on the
 specified graph. The graph can be any ascii text file  that has an 'at'
 character, which is going to be the starting location, and a '!' character
 which will be the destination.
@@ -57,7 +68,7 @@ The nodes on this graph that are spaces are connected with any directly
 adjacent nodes that are also spaces. Nodes that aren't spaces are not 
 connected with anything.
 
-### Compiling and Running
+### Compiling and Running:
 
 This program usually compiles under both GCC and clang. Build with:
 
@@ -65,7 +76,7 @@ This program usually compiles under both GCC and clang. Build with:
 $(CC) -std=c99 -o tbfs prog.c
 ```
 
-where $(CC) is cc, gcc, clang, or somet other c compiler.
+where $(CC) is cc, gcc, clang, or some other c compiler.
 
 You can then run it with:
 
@@ -85,8 +96,8 @@ Examples:
 - The program must be ran in a terminal that supports ANSI escape codes for
 moving the cursor and changing colors.
 - Segfaults happen sometimes.
-- I don't know what memergy management there is, if any.
+- I don't know what memory management there is, if any.
-- Ths program will not compile by an ANSI C compiler: it uses for loops, and
+- The program will not compile by an ANSI C compiler: it uses for loops, and
 it uses C++ style comments. It should compile cleanly using a C99 standard.
 - Breadth first search is slow (and very slow on certain maps), but my A star
 version of this program is too big.