Fix segfault in 1993/schnitzi + update README.md

If no file was specified or could not be opened the program segfaulted.
This has been fixed.

Format fixes in README.md.

1993/schnitzi/README.md

@@ -9,23 +9,45 @@
 
         make all
 
-[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) made this use `fgets()`
+[Cody Boone Ferguson](/winners.html#Cody_Boone_Ferguson) fixed this to not
-not `gets()` to make it safer. Thank you Cody for your assistance!
+segfault when no file is specified or the file cannot be opened for reading. he
+also made this use `fgets()` not `gets()` to make it safer. Thank you Cody for
+your assistance!
 
-### To run
+### To run:
 
 	    ./schnitzi file
 	
 where:
+	    
 	    file	a file containing some text
 
-## Judges' comments
+## Try:
+
+	    ./schnitzi schnitzi.info
+	    # ask some questions suggested by the author, noted below
+
+We also suggest you ask the program:
+
+	    Who is Mark Schnitzus?
+
+Notice how it still manages to answer the question despite there being an
+intentional spelling error there.
+
+Try feeding the program source to the program and ask both:
+
+	What is cat ?
+	What is cat?
+
+
+## Judges' comments:
 
 After this program prints the contents of 'file', ask it
 some questions related to the text.
     
 The author suggests the following questions when using schnitzi.info:
 
+
 	Who is Mark Schnitzius?
 	What exactly does this program do?
 	What language is it written in?
@@ -38,17 +60,11 @@ not `gets()` to make it safer. Thank you Cody for your assistance!
 We suggest you try using the body (minus the header and signature line) 
 of a Usenet article.  You might want to try something from alt.flame.  :-)
 
-    If you have a ' in the question this entry may fail.
+NOTE: If you have a ' in the question this entry may fail.
 
-    NOTE: This entry uses `gets()` so you might get a warning when compiling and
+NOTE: The author may also be contacted at: marks@aldrin.ksc.nasa.gov.
-    running this entry.
 
-    NOTE: this entry will likely segfault if you do not provide it with a data
+## Author's comments:
-    file.
-
-    NOTE: The author may also be contacted at: marks@aldrin.ksc.nasa.gov
-
-## Author's comments
 
 I wanted to write a program that would read in a text file in
 natural language (such as English) and answer questions about that
@@ -58,39 +74,37 @@ not `gets()` to make it safer. Thank you Cody for your assistance!
 
 This program accepts the name of a text file as the first
 parameter.  For example, to run it on the supplied data file called
-    'info' you would type 'schnitzi info'.  It echoes the file, then
+'info' you would type `./schnitzi info`.  It echoes the file, then
 gives you a prompt where you may type in questions about that text.
 The more words you use which are actually present in the text file,
-    the better results you get.  You'll need to hit <ctrl-c> to break out
+the better results you get.  You'll need to hit `ctrl-c` to break out
-    of the program.  Just hitting <return> at the prompt will reprint the
+of the program.  Just hitting `return` at the prompt will reprint the
 paragraph.
 
 If you're curious as to how it works, I guess you could feed in the
 source as the input file and ask "How does this work?" at the prompt,
 but I'm not guaranteeing any results...
 
-    Compilation notes:
+### Compilation notes:
 
-    o  The use of 'strcasecmp' may be non-standard.  'strcmp'
+-  The use of 'strcasecmp' may be non-standard.  'strcmp' can be substituted for
-       can be substituted for it, with a slight performance penalty.
+it, with a slight performance penalty.
 
-    o  This program depends on the first command-line parameter, typically
+-  This program depends on the first command-line parameter, typically called
-       called argv[0], to hold the name of the executable.  It is my under-
+argv[0], to hold the name of the executable.  It is my understanding that this
-       standing that this property of argv[0] is not guaranteed on some
+property of argv[0] is not guaranteed on some systems.
-       systems.
 
-    This program is obfuscated in the following ways:
+### Obfuscation:
 
-    o  It uses a hidden string to test for punctuation;
+-  It uses a hidden string to test for punctuation.
 
-    o  The layout, variable names, and expression format
+-  The layout, variable names, and expression format have been chosen in such a
-       have been chosen in such a way as to cause visual confusion;
+way as to cause visual confusion.
 
-    o  It uses uses external 'system' calls to echo the text
+-  It uses uses external 'system' calls to echo the text file and break up the
-       file and break up the question into individual words with a
+question into individual words with a recursive call.
-       recursive call;
 
-    o  It uses a clever hack to simulate artificial intelligence.
+-  It uses a clever hack to simulate artificial intelligence.
 
 The text for the info file, by the way, consists largely of headlines
 from the Weekly World News.

1993/schnitzi/schnitzi.c

@@ -13,9 +13,9 @@
 (                lll>l1  )                 li|=! (                  l[3*l1+++3
  ]           -ll[strlen (                 ll)-1]  )                    ;return
 (                    li  )                ;}main (                      ll,lll
- )  char*lll[];{char l1 [   111][21],li1[111][21  ]              ,il1[111],i1l
+ )  char*lll[];{if(ll<2)return 1;char l1 [111][21],  li1[111][21],il1[111],i1l
 [                   111  ] ;int lli,l11,l1l,li/* (  */,ll1,il,l;FILE*f;if(ll-2
- )             {f=fopen (             lll[1],"r"  )     ;lli=l=ll1=il=!1;while
+ )             {f=fopen (             lll[1],"r"  );if(!f)return 1;lli=l=ll1=il=!1;while
 ( fscanf(f,"%s",l1[lli]  )             +1){li=ii (                   l1[lli],3
  )                 ;iii (                l1[lli]  )          ;l1l=l11=!1;while
 (               l1l>-ll  )                  {iii (                   lll[-l1l]