From c52a7c138bb91fd87c9cc4b0aa1cf3901727b768 Mon Sep 17 00:00:00 2001
From: Cody Boone Ferguson <53008573+xexyl@users.noreply.github.com>
Date: Sat, 18 Nov 2023 04:40:50 -0800
Subject: [PATCH] Add 1998/schweikh3 alt code

This is for the rare case that the author described where the size needs
to be increased: it can now be done when compiling without having to
update the code. The original code is the recommended one try first; if
any of '-D' macros are not defined it will use the default, including
the size one. This so to make it easier to redefine just one, rather
than having to specify all the -D options.
---
 1998/schweikh3/.gitignore      |  1 +
 1998/schweikh3/Makefile        |  4 +-
 1998/schweikh3/README.md       | 31 +++++++++----
 1998/schweikh3/schweikh3.alt.c | 85 ++++++++++++++++++++++++++++++++++
 thanks-for-fixes.md            |  5 +-
 5 files changed, 114 insertions(+), 12 deletions(-)
 create mode 100644 1998/schweikh3/schweikh3.alt.c

diff --git a/1998/schweikh3/.gitignore b/1998/schweikh3/.gitignore
index f34630eca..289578d6f 100644
--- a/1998/schweikh3/.gitignore
+++ b/1998/schweikh3/.gitignore
@@ -1,4 +1,5 @@
 schweikh3
+schweikh3.alt
 file1
 file2
 file3
diff --git a/1998/schweikh3/Makefile b/1998/schweikh3/Makefile
index 1a4cbadd8..cfb328a99 100644
--- a/1998/schweikh3/Makefile
+++ b/1998/schweikh3/Makefile
@@ -113,8 +113,8 @@ OBJ= ${PROG}.o
 DATA= samefile.1
 TARGET= ${PROG}
 #
-ALT_OBJ=
-ALT_TARGET=
+ALT_OBJ= ${PROG}.alt.o
+ALT_TARGET= ${PROG}.alt
 
 
 #################
diff --git a/1998/schweikh3/README.md b/1998/schweikh3/README.md
index ad2e479d0..aac682d00 100644
--- a/1998/schweikh3/README.md
+++ b/1998/schweikh3/README.md
@@ -13,15 +13,8 @@ the same size (on systems where `sizeof (char *) == 4`, or `4096` when
 31.
 ```
 
-so we changed the constant to be `SZ` defined in the Makefile. To change the
-value you can do something like:
-
-```sh
-make clobber CDEFINE="-DM0=sizeof -DM1=long -DM2=void \
-	-DM3=realloc -DM4=calloc -DM5=free -DSZ=55555" all
-```
-
-or whatever you wish to redefine it to.
+An alternate version allows one to fix this; see [alternate
+code](#alternate-code) below.
 
 
 ## To use:
@@ -48,6 +41,26 @@ If you're in this winning entry's directory:
 Notice that the tool finds some files that are duplicates.
 
 
+## Alternate code:
+
+If you run into the problem that the author described (above) you can redefine
+the size as described; this was done with the `SZ` macro defined in the Makefile
+which if (in the code) is unset will be set to the default, 32767.
+
+
+### Alternate build:
+
+If you wish to change the size to say, 55555:
+
+
+```sh
+make clobber CDEFINE="-DSZ=55555" alt
+```
+
+or whatever you wish to redefine it to. See [alternate code](#alternate-code)
+below.
+
+
 ## Judges' remarks:
 
 This program is not as smart as to detect identity of JPEG files with the same
diff --git a/1998/schweikh3/schweikh3.alt.c b/1998/schweikh3/schweikh3.alt.c
new file mode 100644
index 000000000..b6db1c87b
--- /dev/null
+++ b/1998/schweikh3/schweikh3.alt.c
@@ -0,0 +1,85 @@
+%:define _POSIX_SOURCE
+#include<fcntl.h>
+#include<stdio.h>
+#include<unistd.h>
+#include<stdlib.h>
+#include<string.h>
+#include<sys/types.h>
+#include<sys/stat.h>
+#ifndef M0
+#define M0 sizeof
+#endif
+#ifndef M1
+#define M1 long
+#endif
+#ifndef M2
+#define M2 void
+#endif
+#ifndef M3
+#define M3 realloc
+#endif
+#ifndef M4
+#define M4 calloc
+#endif
+#ifndef M5
+#define M5 free
+#endif
+#ifndef SZ
+#define SZ 32767
+#elif SZ < 32767
+#undef SZ
+#define SZ 32767
+#endif
+#define D(N,t)Z t*N V<%t*z U M0*z); H z)u z; X}
+#define k(x,y)x<0||fstat(x,&y)||
+#define h(x)=open(x,O_RDONLY)
+#define b(x),(int)x.st_nlink
+#define B ;typedef g
+#define X exit (1);
+#define O .st_size
+#define U =malloc(
+#define Y S.st_ino
+#define v ;%>else
+#define W .st_dev
+#define o ||read(
+#define Z static
+#define g struct
+#define u return
+#define I char*
+#define V (M2)
+#define H if(
+#define _ ->
+
+/* HE WHO SAYS */
+
+Z I A<:   SZ/      M0(I )]; Z g     stat S,T; Z        size_t    y B f{
+I n ; g f *  x     ; dev_t d  ;    ino_t i; } f B      t{ M1     s,c; f
+*l; g t*L,*R; }    t; D(a,t)D(E    ,f)Z t*J(t*p,I      n){ H!   p){ p=
+a(); p    _ s =S      O; p _       c=1; p              _ L=p    _ R=0;
+p _ l=    E(); p      _ l  _       n=n; p              _ l _   x=0; p
+_ l  _    d=S W;      p _  l       _ i= Y              v H S   O==p _
+s){ f*    e; for      (e=p _       l; e; e=e _ x)      { H S W==e _ 
+d&&Y==    e _ i)      { u p;        } } e=E(); e _     x=p _ l; e _ 
+n=n; e    _ d =S      W; e _                i=Y; p     _ l=e;  ++p _ 
+c v  H    S O< p      _ s) {                p _ L=     J( p _  L,n)v{
+p _ R=    J (p _      R,n );                } u  p     ; }  Z   int Q(
+I G,I F){ int d    h(G),D h(F);    I m,*M; H k(d,S     )k(D,T   )(y =S 
+O)-T O){ y= 0;     goto d; } H!    (m U y))||!(M U     y))o d    ,m,y)-
+y o D,M,y)-y)      X y=!memcmp(     m,M,y); M5(m)      ; M5(M    ); d:V
+
+ close (d );V      close(D); u        y; } Z M2 C(M1       z,M1 N){ M1     i=N*(N-1)/2,
+j=1,s; I q,*e,*    p,*w,*l; e=q=     M4((size_t)i,1);     H!e) X p=q+i;    for(i=0; e-p
+; ++e){ H!*e&&Q    (A[i:>,A[j])){   V printf("%""l""d"   "\t""%" "s""\t"   "%""s"
+"??/t"             "%""c"   "\11"   "%""d"      "??/t"   "%""d"    "\n",   z,A[i]
+,A[j],             S W -T   W?'X'   :'='b(      S)b(T)   ); H j    -i-1)   { s=N-
+i-3; w             =e+s+1; l=q+N*   (j-1)-      j*(j-1   )/ 2 ;            do{ *w
+=1; H w==l)        break; w+= s;    } while( s-->0); }   } H++j            ==N){ j=i+++
+ 2; } } M5(q);     } Z M2 P(t*p     ){ H p){ P(p _ R);   H  p _            c>1){ M1 i=0
+         ; f*l=    p _ l;           for (;      i< p _   c; ++i            ){ A[i
+         ]= l _    n; l=l           _ x; }      C (p _   s, p _    c); }   P (p _ 
+         L) ; }    }  int           main V      { t*r=   0; I F    ; for   (; ; )
+{ H!(F U 1024))    )X H !           fgets(      F,1024   ,stdin) )break;   *(F+(y
+=strlen(F))-1)=    0; H!(          F=M3(F,      y)))X H   stat(F,&S)==0    &&S_ISREG(S.
+ st_mode)&&S O     )r=J(r          ,F ); }      H r)P(r    ); u 0; }/*     Obfuscated C
+
+IS FREE THINKS MONEY GROWS ON DIRECTORY TREE */
diff --git a/thanks-for-fixes.md b/thanks-for-fixes.md
index c9d72b312..d658375a6 100644
--- a/thanks-for-fixes.md
+++ b/thanks-for-fixes.md
@@ -2060,7 +2060,6 @@ by changing the typedef `lint` (to `int` - see the code for why this has to be
 done in modern systems) to be `_int`.
 
 
-## [1998/dlowe](1998/dlowe/dlowe.c) ([README.md](1998/dlowe/README.md]))
 ## [1998/dlowe](1998/dlowe/dlowe.c) ([README.md](1998/dlowe/README.md]))
 
 Cody made the program more portable by changing the void return type of `main()`
@@ -2200,6 +2199,10 @@ README.md.
 
 ## [1998/schweikh3](1998/schweikh3/schweikh3.c) ([README.md](1998/schweikh3/README.md]))
 
+Cody added the [alternate code](1998/schweikh3/README.md#alternate-code) which allows one
+to reconfigure the size constant in the rare case that the author wrote about
+occurs.
+
 Cody added the [try.sh](1998/schweikh3/try.sh) script to make it easier to try
 the commands that we suggested. One command was not added, that of the to use
 command.