All 1990 entries now compile!

My first 41st, 51st and 29th (all depending on the base) birthday
updates (possibly more will follow but this is not a certainty). All the
1990 entries now compile!

In one we used a patch from Yusuke Endoh (thank you Yusuke!) which we
credited him in the README and in another we used a tip from him (use
-ansi at the compiler line) to get the other to compile (again, thank
you Yusuke!). We fixed the others. In the case of 1990/tbr/tbr.c the
author had supplied a shorter version and we fixed that one too.

Added 1990/.gitignore which has the built files of 1990 so that after
doing `cd 1990 ; make all' running `git status .' will not show any
untracked files.

1990/tbr/README.md

@@ -10,8 +10,6 @@
 
         make all
 
-	NOTE: This entry may not compile when using modern compilers.
-
 ### To run
 
 	./tbr
@@ -20,23 +18,28 @@
 
     This program implements a subject a well known Un*x utility whose 
     original source was considered to be extremely obfuscated by many
-    people, excluding its author.  In fact, this utility one a major
+    people, excluding its author.  In fact, this utility was a major
     inspiration for the formation of this contest.
 
     The author supplied us with a slightly smaller unformatted version
     of the program which we include below:
 
-    #define D ,close(
-    char*c,q[512],m[256],*v[99],**u,*i[3];int f[2],p;main(){for(m[m[60]=m[62]=
-    32]=m[*m=124[m]=9]=6;e(-8),gets(1+(c=q))||exit(0);r(0,0))for(;*++c;);}
-    r(t,o){*i=i[2]=0;for(u=v+98;m[*--c]^9;m[*c]&32?i[*c&2]=
-    *u,u-v^98&&++u:3)if(!m[*c]){for(*++c=0;!m[*--c];);*--u=
-    ++c;}u-v^98?strcmp(*u,"cd")?*c?pipe(f),o=f[1]:1,(p=fork())?e(p),o?
-    r(o,0)D o)D*f):4,wait(0):(o?dup2(*f,0)D*f)D o):*i?1 D
-    0),e(open(*i,0)):5,t?dup2(t,1)D t):i[2]?9 D
-    1),e(creat(i[2],438)):2,e(execvp(*u,u))):e(chdir(u[1])*2):6;}
-    e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||exit(1):5;}
-    
+	    #define D ,close(
+	    char*c,q[512],m[256],*v[99],**u,*i[3];int f[2],p;main(){for(m[m[60]=m[62]=
+	    32]=m[*m=124[m]=9]=6;e(-8),gets(1+(c=q))||(exit(0),0);r(0,0))for(;*++c;);}
+	    r(t,o){*i=i[2]=0;for(u=v+98;m[*--c]^9;m[*c]&32?i[*c&2]=
+	    *u,u-v^98&&++u:3)if(!m[*c]){for(*++c=0;!m[*--c];);*--u=
+	    ++c;}u-v^98?strcmp(*u,"cd")?*c?pipe(f),o=f[1]:1,(p=fork())?e(p),o?
+	    r(o,0)D o)D*f):4,wait(0):(o?dup2(*f,0)D*f)D o):*i?1 D
+	    0),e(open(*i,0)):5,t?dup2(t,1)D t):i[2]?9 D
+	    1),e(creat(i[2],438)):2,e(execvp(*u,u))):e(chdir(u[1])*2):6;}
+	    e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||(exit(1),0):5;}
+
+
+    Modern compilers had a problem with this entry because the exit(3) function
+    returns void but we were able to get it to compile by using the comma
+    operator which we also did in the smaller version.
+
 ## Author's comments
 
     Guvf cebtenz vf n ehqvzragnel furyy. Vg qbrf v/b erqverpgvba, cvcrf

1990/tbr/tbr.c

@@ -4,7 +4,7 @@
 char              *c,q              [512              ],m[              256
 ],*v[           99], **u,        *i[3];int         f[2],p;main       (){for
  (m[m        [60]=   m[62      ]=32   ]=m[*      m=124   [m]=       9]=6;
-  e(-8)     ,gets      (1+(    c=q)     )||      exit      (0);     r(0,0)
+  e(-8)     ,gets      (1+(    c=q)     )||      (exit    (0),0);   r(0,0)
    )for(    ;*++        c;);  }r(t,      o){    *i=i        [2]=    0;for
      (u=v  +98           ;m[*--c]         ^9;m [*c]          &32  ?i[*c
        &2]=                *u,u-             v^98              &&++u:
@@ -19,5 +19,5 @@ char              *c,q              [512              ],m[              256
 	2	]?
 	6	D 1),e(creat(i[2],438)):
 	5	,e(execvp(*u,u))):e(chdir(u[1])*2):
-	3	;}e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||exit(1):
+	3	;}e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||(exit(1),0):
 	5	;}