TurboC2.0 Patches to add TMP env var and better usage msg
Prereq: 1
*** ../tcpatch/tcpatlev.h	Wed Jul 18 10:37:44 1990
--- tcpatlev.h	Wed Jul 18 10:38:10 1990
***************
*** 1,1 ****
! #define TCPATCHLEVEL 1
--- 1,1 ----
! #define TCPATCHLEVEL 2
*** ../tcpatch/readme	Wed Jul 18 09:54:12 1990
--- readme	Wed Jul 18 09:53:56 1990
***************
*** 81,83 ****
--- 81,92 ----
  temp files go in directory /tmp
  ed scripts disabled
  
+ 
+ *** OFFICIAL PATCHLEVEL 12, TurboC2.0 PATCHLEVEL 2
+ 
+ From: ward@sneezy.cs.wisc.edu (Mike Ward)
+ Date: 31 May 90 
+ 
+ improved (more descriptive) usage message
+ temp files go in directory specified by TMP env var (or current dir if no TMP)
+ ed scripts still disabled
*** ../tcpatch/common.h	Thu May 31 12:34:31 1990
--- common.h	Thu May 31 12:47:03 1990
**************
*** 128,137
  EXT char *origext INIT(Nullch);
  EXT char *origprae INIT(Nullch);
  
! EXT char TMPOUTNAME[] INIT("/tmp/patchoXXXXXX");
! EXT char TMPINNAME[] INIT("/tmp/patchiXXXXXX");	/* might want /usr/tmp here */
! EXT char TMPREJNAME[] INIT("/tmp/patchrXXXXXX");
! EXT char TMPPATNAME[] INIT("/tmp/patchpXXXXXX");
  EXT bool toutkeep INIT(FALSE);
  EXT bool trejkeep INIT(FALSE);
  
--- 128,137 -----
  EXT char *origext INIT(Nullch);
  EXT char *origprae INIT(Nullch);
  
! EXT char *TMPOUTNAME INIT("/tmp/patchoXXXXXX");
! EXT char *TMPINNAME  INIT("/tmp/patchiXXXXXX");	/* might want /usr/tmp here */
! EXT char *TMPREJNAME INIT("/tmp/patchrXXXXXX");
! EXT char *TMPPATNAME INIT("/tmp/patchpXXXXXX");
  EXT bool toutkeep INIT(FALSE);
  EXT bool trejkeep INIT(FALSE);
  
*** ../tcpatch/tcpatch.c	Thu May 31 12:34:31 1990
--- patch.c	Thu May 31 12:47:03 1990
***************
*** 1,5 ****
  char rcsid[] =
! 	"$Header: patch.c,v 2.0.1.6 88/06/22 20:46:39 lwall Locked $";
  
  /* patch - a program to apply diffs to original files
   *
--- 1,5 ----
  char rcsid[] =
! 	"$Header: patch.c,v 2.0.1.7 90/05/30 11:30:00 mward $";
  
  /* patch - a program to apply diffs to original files
   *
***************
*** 9,14 ****
--- 9,18 ----
   * money off of it, or pretend that you wrote it.
   *
   * $Log:	patch.c,v $
+  * Revision 2.0.1.7  90/05/30  11:30:00  mward
+  * Added usage message vars and routines: use_msg, progname, usage, fname
+  * Check environment for TMP and init temp file names
+  * 
   * Revision 2.0.1.6  88/06/22  20:46:39  lwall
   * patch12: rindex() wasn't declared
   * 
***************
*** 97,102 ****
--- 101,108 ----
  
  /* procedures */
  
+ char *fname();
+ void usage();
  void reinitialize_almost_everything();
  void get_some_switches();
  LINENUM locate_hunk();
***************
*** 112,117 ****
--- 118,195 ----
  void re_input();
  void my_exit();
  
+ 
+ char *progname;
+ 
+ char *use_msg[] = {
+     "purpose: apply diff file(s) to original(s) to generate updated file(s)\n",
+     "usage:   %s [options] orig patchfile [+ [options] orig]\n",
+     "         %s <patchfile\n"
+     "options:\n",
+     "   -         read patchfile from standard input\n",
+     "   -?        display help message (this text)\n",
+     "   -b arg    use arg as backup file extension (default is ~ or .orig)\n",
+     "   -B arg    use arg as backup file prefix (cancels -b option)\n",
+     "   -c        interpret patchfile as context diffs\n",
+     "   -d arg    use arg as directory to cd to before continuing\n",
+     "   -D arg    surround patched with \"#ifdef arg ... #endif\"\n",
+     "   -e        interpret patchfile as an ed script\n",
+     "   -f        do not ask questions\n",
+     "   -F<num>   set max fuzz factor to <num> (default 2, context diffs only)\n",
+     "   -h        display help message (this text)\n",
+     "   -l        loose (non \\n whitespace) pattern matching\n",
+     "   -n        interpret patchfile as a normal diff\n",
+     "   -N        ignore patches that are reversed or already applied\n",
+     "   -o arg    use arg as output file name\n",
+     "   -p<num>   set path strip count to <num> (default 937,# /'s to strip)\n",
+     "   -r arg    use arg as the reject file name\n",
+     "   -R        interpret patch as if orig and new were reversed at diff gen\n",
+     "   -s        silent operation - no messages\n",
+     "   -S        skip current patch, but continue\n",
+     "   -v        version - print revision header and patch level\n",
+     "   -x<num>   set internal debugging flags to <num>\n",
+     "examples\n",
+     "   %s <ms_sh_16.dif         # normally read all patches from stdin\n",
+     "   %s -S + -S + <patch.dif  # skip 1st and 3rd patches in patch.dif\n",
+     "notes:\n"
+     "   By default, the patched version is put in place of the original\n",
+     NULL
+ };
+ 
+ 
+ /* Return pointer to first char of file name in spec */
+ 
+ char *
+ fname(char *spec)
+ {
+     char *cptr;
+     char *tptr;
+ 
+     cptr = spec + strlen(spec);
+     while ((cptr!=spec) && (index("/\\:",*(cptr-1))==Nullch)) {
+         cptr--;
+     }
+     if ((tptr=index(cptr,'.'))!=Nullch) *tptr='\0';
+     return (cptr);
+ }
+
+ 
+ 
+ /* Print the usage message */
+ 
+ void
+ usage()
+ {
+     char **ptr;
+     char *name;
+ 
+     name = fname(progname);
+     for (ptr=use_msg; *ptr; ptr++) {
+         say2(*ptr,name);
+     }
+ }
+ 
+ 
  /* Apply a set of diffs as appropriate. */
  
  main(argc,argv)
***************
*** 126,135 ****
--- 204,226 ----
      int failed = 0;
      int failtotal = 0;
      int i;
+     char tmpdir[MAXPATH];
+     char *tmpenv;
  
+ 
+     progname = (*argv[0]?argv[0]:"patch");
      setbuf(stderr, serrbuf);
      for (i = 0; i<MAXFILEC; i++)
  	filearg[i] = Nullch;
+ 
+     /* initialize temp file names */
+     tmpenv = getenv("TMP");
+     strcpy(tmpdir,(tmpenv!=NULL?tmpenv:""));
+     if (strlen(tmpdir) && tmpdir[strlen(tmpdir)-1]!='/') strcat(tmpdir,"/");
+     TMPOUTNAME = strcat(strcpy(malloc(MAXPATH),tmpdir),fname(TMPOUTNAME));
+     TMPINNAME  = strcat(strcpy(malloc(MAXPATH),tmpdir),fname(TMPINNAME));
+     TMPREJNAME = strcat(strcpy(malloc(MAXPATH),tmpdir),fname(TMPREJNAME));
+     TMPPATNAME = strcat(strcpy(malloc(MAXPATH),tmpdir),fname(TMPPATNAME));
      Mktemp(TMPOUTNAME);
      Mktemp(TMPINNAME);
      Mktemp(TMPREJNAME);
***************
*** 426,431 ****
--- 517,527 ----
  		    s++;
  		maxfuzz = atoi(s);
  		break;
+ 	    case '?':
+ 	    case 'h':
+ 		usage();
+ 		my_exit(0);
+ 		break;
  	    case 'l':
  		canonicalize = TRUE;
  		break;
***************
*** 466,472 ****
  		break;
  #endif
  	    default:
! 		fatal2("Unrecognized switch: %s\n", Argv[0]);
  	    }
  	}
      }
--- 562,570 ----
  		break;
  #endif
  	    default:
! 		say2("Unrecognized switch: %s\n", Argv[0]);
! 		usage();
! 		my_exit(1);
  	    }
  	}
      }
*** ../patch/patch.man	Wed May 30 15:02:54 1990
--- patch.man	Sat Jun 02 07:31:00 1990
***************
*** 1,72 ****
! .rn '' }`
! ''' $Header: patch.man,v 2.0.1.2 88/06/22 20:47:18 lwall Locked $
! ''' 
! ''' $Log:	patch.man,v $
! ''' Revision 2.0.1.2  88/06/22  20:47:18  lwall
! ''' patch12: now avoids Bell System Logo
! ''' 
! ''' Revision 2.0.1.1  88/06/03  15:12:51  lwall
! ''' patch10: -B switch was contributed.
! ''' 
! ''' Revision 2.0  86/09/17  15:39:09  lwall
! ''' Baseline for netwide release.
! ''' 
! ''' Revision 1.4  86/08/01  19:23:22  lwall
! ''' Documented -v, -p, -F.
! ''' Added notes to patch senders.
! ''' 
! ''' Revision 1.3  85/03/26  15:11:06  lwall
! ''' Frozen.
! ''' 
! ''' Revision 1.2.1.4  85/03/12  16:14:27  lwall
! ''' Documented -p.
! ''' 
! ''' Revision 1.2.1.3  85/03/12  16:09:41  lwall
! ''' Documented -D.
! ''' 
! ''' Revision 1.2.1.2  84/12/05  11:06:55  lwall
! ''' Added -l switch, and noted bistability bug.
! ''' 
! ''' Revision 1.2.1.1  84/12/04  17:23:39  lwall
! ''' Branch for sdcrdcf changes.
! ''' 
! ''' Revision 1.2  84/12/04  17:22:02  lwall
! ''' Baseline version.
! ''' 
! .de Sh
! .br
! .ne 5
! .PP
! \fB\\$1\fR
! .PP
! ..
! .de Sp
! .if t .sp .5v
! .if n .sp
! ..
! '''
! '''     Set up \*(-- to give an unbreakable dash;
! '''     string Tr holds user defined translation string.
! '''     Bell System Logo is used as a dummy character.
! '''
! .ie n \{\
! .tr \(*W-\*(Tr
! .ds -- \(*W-
! .if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
! .if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
! .ds L" ""
! .ds R" ""
! .ds L' '
! .ds R' '
! 'br\}
! .el\{\
! .ds -- \(em\|
! .tr \*(Tr
! .ds L" ``
! .ds R" ''
! .ds L' `
! .ds R' '
! 'br\}
  .TH PATCH 1 LOCAL
  .SH NAME
  patch - a program for applying a diff file to an original
--- 1,5 ----
! .sc ^
! .nj
  .TH PATCH 1 LOCAL
  .SH NAME
  patch - a program for applying a diff file to an original
***************
*** 87,93 ****
  version.
  By default, the patched version is put in place of the original, with
  the original file backed up to the same name with the
! extension \*(L".orig\*(R" or \*(L"~\*(R" , or as specified by the
  .B -b
  switch.
  You may also specify where you want the output to go with a
--- 20,26 ----
  version.
  By default, the patched version is put in place of the original, with
  the original file backed up to the same name with the
! extension ".orig" or "~", or as specified by the
  .B -b
  switch.
  You may also specify where you want the output to go with a
***************
*** 99,107 ****
  .PP
  Upon startup, patch will attempt to determine the type of the diff listing,
  unless over-ruled by a
! .BR -c ,
! .BR -e ,
! or
  .B -n
  switch.
  Context diffs and normal diffs are applied by the
--- 32,41 ----
  .PP
  Upon startup, patch will attempt to determine the type of the diff listing,
  unless over-ruled by a
! .B -c
! ,
! .B -e
! , or
  .B -n
  switch.
  Context diffs and normal diffs are applied by the
***************
*** 144,150 ****
  .I patch
  cannot find a place to install that hunk of the patch, it will put the
  hunk out to a reject file, which normally is the name of the output file
! plus \*(L".rej\*(R" or \*(L"#\*(R" .
  (Note that the rejected hunk will come out in context diff form whether the
  input patch was a context diff or a normal diff.
  If the input was a normal diff, many of the contexts will simply be null.)
--- 78,84 ----
  .I patch
  cannot find a place to install that hunk of the patch, it will put the
  hunk out to a reject file, which normally is the name of the output file
! plus ".rej" or "#" .
  (Note that the rejected hunk will come out in context diff form whether the
  input patch was a context diff or a normal diff.
  If the input was a normal diff, many of the contexts will simply be null.)
***************
*** 168,176 ****
  will try to figure out from the leading garbage what the name of the file
  to edit is.
  In the header of a context diff, the filename is found from lines beginning
! with \*(L"***\*(R" or \*(L"---\*(R", with the shortest name of an existing
  file winning.
! Only context diffs have lines like that, but if there is an \*(L"Index:\*(R"
  line in the leading garbage,
  .I patch
  will try to use the filename from that line.
--- 102,110 ----
  will try to figure out from the leading garbage what the name of the file
  to edit is.
  In the header of a context diff, the filename is found from lines beginning
! with "***" or "---", with the shortest name of an existing
  file winning.
! Only context diffs have lines like that, but if there is an "Index:"
  line in the leading garbage,
  .I patch
  will try to use the filename from that line.
***************
*** 183,189 ****
  .I patch
  will attempt to get or check out the file.)
  .PP
! Additionally, if the leading garbage contains a \*(L"Prereq: \*(R" line,
  .I patch
  will take the first word from the prerequisites line (normally a version
  number) and check the input file to see if that word can be found.
--- 117,123 ----
  .I patch
  will attempt to get or check out the file.)
  .PP
! Additionally, if the leading garbage contains a "Prereq: " line,
  .I patch
  will take the first word from the prerequisites line (normally a version
  number) and check the input file to see if that word can be found.
***************
*** 215,257 ****
  .PP
  .I Patch
  recognizes the following switches:
! .TP 5
! .B \-b
  causes the next argument to be interpreted as the backup extension, to be
! used in place of \*(L".orig\*(R" or \*(L"~\*(R".
! .TP 5
! .B \-B
  causes the next argument to be interpreted as a prefix to the backup file
  name. If this argument is specified any argument from -b will be ignored.
  This argument is an extension to Larry Wall's patch v2.0.1.4, patchlevel 8,
  made by M. Greim (greim@sbsvax.uucp).
! .TP 5
! .B \-c
  forces
  .I patch
  to interpret the patch file as a context diff.
! .TP 5
! .B \-d
  causes
  .I patch
  to interpret the next argument as a directory, and cd to it before doing
  anything else.
! .TP 5
! .B \-D
  causes
  .I patch
  to use the "#ifdef...#endif" construct to mark changes.
  The argument following will be used as the differentiating symbol.
  Note that, unlike the C compiler, there must be a space between the
! .B \-D
  and the argument.
! .TP 5
! .B \-e
  forces
  .I patch
  to interpret the patch file as an ed script.
! .TP 5
! .B \-f
  forces
  .I patch
  to assume that the user knows exactly what he or she is doing, and to not
--- 149,185 ----
  .PP
  .I Patch
  recognizes the following switches:
! .IN 8
! .TP -b
  causes the next argument to be interpreted as the backup extension, to be
! used in place of ".orig" or "~".
! .TP -B
  causes the next argument to be interpreted as a prefix to the backup file
  name. If this argument is specified any argument from -b will be ignored.
  This argument is an extension to Larry Wall's patch v2.0.1.4, patchlevel 8,
  made by M. Greim (greim@sbsvax.uucp).
! .TP -c
  forces
  .I patch
  to interpret the patch file as a context diff.
! .TP -d
  causes
  .I patch
  to interpret the next argument as a directory, and cd to it before doing
  anything else.
! .TP -D
  causes
  .I patch
  to use the "#ifdef...#endif" construct to mark changes.
  The argument following will be used as the differentiating symbol.
  Note that, unlike the C compiler, there must be a space between the
! .B -D
  and the argument.
! .TP -e
  forces
  .I patch
  to interpret the patch file as an ed script.
! .TP -f
  forces
  .I patch
  to assume that the user knows exactly what he or she is doing, and to not
***************
*** 258,267 ****
  ask any questions.
  It does not suppress commentary, however.
  Use
! .B \-s
  for that.
! .TP 5
! .B \-F<number>
  sets the maximum fuzz factor.
  This switch only applies to context diffs, and causes
  .I patch
--- 186,194 ----
  ask any questions.
  It does not suppress commentary, however.
  Use
! .B -s
  for that.
! .TP -F<number>
  sets the maximum fuzz factor.
  This switch only applies to context diffs, and causes
  .I patch
***************
*** 269,276 ****
  Note that a larger fuzz factor increases the odds of a faulty patch.
  The default fuzz factor is 2, and it may not be set to more than
  the number of lines of context in the context diff, ordinarily 3.
! .TP 5
! .B \-l
  causes the pattern matching to be done loosely, in case the tabs and
  spaces have been munged in your input file.
  Any sequence of whitespace in the pattern line will match any sequence
--- 196,202 ----
  Note that a larger fuzz factor increases the odds of a faulty patch.
  The default fuzz factor is 2, and it may not be set to more than
  the number of lines of context in the context diff, ordinarily 3.
! .TP -l
  causes the pattern matching to be done loosely, in case the tabs and
  spaces have been munged in your input file.
  Any sequence of whitespace in the pattern line will match any sequence
***************
*** 277,299 ****
  in the input file.
  Normal characters must still match exactly.
  Each line of the context must still match a line in the input file.
! .TP 5
! .B \-n
  forces
  .I patch
  to interpret the patch file as a normal diff.
! .TP 5
! .B \-N
  causes
  .I patch
  to ignore patches that it thinks are reversed or already applied.
  See also
! .B \-R .
! .TP 5
! .B \-o
  causes the next argument to be interpreted as the output file name.
! .TP 5
! .B \-p<number>
  sets the pathname strip count,
  which controls how pathnames found in the patch file are treated, in case
  the you keep your files in a different directory than the person who sent
--- 203,221 ----
  in the input file.
  Normal characters must still match exactly.
  Each line of the context must still match a line in the input file.
! .TP -n
  forces
  .I patch
  to interpret the patch file as a normal diff.
! .TP -N
  causes
  .I patch
  to ignore patches that it thinks are reversed or already applied.
  See also
! .B -R .
! .TP -o
  causes the next argument to be interpreted as the output file name.
! .TP -p<number>
  sets the pathname strip count,
  which controls how pathnames found in the patch file are treated, in case
  the you keep your files in a different directory than the person who sent
***************
*** 306,338 ****
  	/u/howard/src/blurfl/blurfl.c
  .sp
  setting
! .B \-p
  or
! .B \-p0
  gives the entire pathname unmodified,
! .B \-p1
  gives
  .sp
  	u/howard/src/blurfl/blurfl.c
  .sp
  without the leading slash,
! .B \-p4
  gives
  .sp
  	blurfl/blurfl.c
  .sp
  and not specifying
! .B \-p
  at all just gives you "blurfl.c".
  Whatever you end up with is looked for either in the current directory,
  or the directory specified by the
! .B \-d
  switch.
! .TP 5
! .B \-r
  causes the next argument to be interpreted as the reject file name.
! .TP 5
! .B \-R
  tells
  .I patch
  that this patch was created with the old and new files swapped.
--- 228,258 ----
  	/u/howard/src/blurfl/blurfl.c
  .sp
  setting
! .B -p
  or
! .B -p0
  gives the entire pathname unmodified,
! .B -p1
  gives
  .sp
  	u/howard/src/blurfl/blurfl.c
  .sp
  without the leading slash,
! .B -p4
  gives
  .sp
  	blurfl/blurfl.c
  .sp
  and not specifying
! .B -p
  at all just gives you "blurfl.c".
  Whatever you end up with is looked for either in the current directory,
  or the directory specified by the
! .B -d
  switch.
! .TP -r
  causes the next argument to be interpreted as the reject file name.
! .TP -R
  tells
  .I patch
  that this patch was created with the old and new files swapped.
***************
*** 342,348 ****
  will attempt to swap each hunk around before applying it.
  Rejects will come out in the swapped format.
  The
! .B \-R
  switch will not work with ed diff scripts because there is too little
  information to reconstruct the reverse operation.
  .Sp
--- 262,268 ----
  will attempt to swap each hunk around before applying it.
  Rejects will come out in the swapped format.
  The
! .B -R
  switch will not work with ed diff scripts because there is too little
  information to reconstruct the reverse operation.
  .Sp
***************
*** 350,356 ****
  .I patch
  will reverse the hunk to see if it can be applied that way.
  If it can, you will be asked if you want to have the
! .B \-R
  switch set.
  If it can't, the patch will continue to be applied normally.
  (Note: this method cannot detect a reversed patch if it is a normal diff
--- 270,276 ----
  .I patch
  will reverse the hunk to see if it can be applied that way.
  If it can, you will be asked if you want to have the
! .B -R
  switch set.
  If it can't, the patch will continue to be applied normally.
  (Note: this method cannot detect a reversed patch if it is a normal diff
***************
*** 360,372 ****
  Luckily, most patches add or change lines rather than delete them, so most
  reversed normal diffs will begin with a delete, which will fail, triggering
  the heuristic.)
! .TP 5
! .B \-s
  makes
  .I patch
  do its work silently, unless an error occurs.
! .TP 5
! .B \-S
  causes
  .I patch
  to ignore this patch from the patch file, but continue on looking
--- 280,290 ----
  Luckily, most patches add or change lines rather than delete them, so most
  reversed normal diffs will begin with a delete, which will fail, triggering
  the heuristic.)
! .TP -s
  makes
  .I patch
  do its work silently, unless an error occurs.
! .TP -S
  causes
  .I patch
  to ignore this patch from the patch file, but continue on looking
***************
*** 376,396 ****
  	patch -S + -S + <patchfile
  .sp
  will ignore the first and second of three patches.
! .TP 5
! .B \-v
  causes
  .I patch
  to print out it's revision header and patch level.
! .TP 5
! .B \-x<number>
  sets internal debugging flags, and is of interest only to
  .I patch
  patchers.
  .SH AUTHOR
  Larry Wall <lwall@jpl-devvax.jpl.nasa.gov>
  .SH ENVIRONMENT
! No environment variables are used by
! .IR patch .
  .SH FILES
  /tmp/patch*
  .SH SEE ALSO
--- 294,319 ----
  	patch -S + -S + <patchfile
  .sp
  will ignore the first and second of three patches.
! .TP -v
  causes
  .I patch
  to print out it's revision header and patch level.
! .TP -x<number>
  sets internal debugging flags, and is of interest only to
  .I patch
  patchers.
+ .OD
  .SH AUTHOR
  Larry Wall <lwall@jpl-devvax.jpl.nasa.gov>
  .SH ENVIRONMENT
! .IN 8
! .TP TMP
! The location for temporary files created by
! .I patch.
! This string specifies the directory where
! .I patch
! puts any tempoorary files, and can (but need not) contain a terminating slash.
! .OD
  .SH FILES
  /tmp/patch*
  .SH SEE ALSO
***************
*** 407,413 ****
  context diff header, or with an Index: line.
  If you are patching something in a subdirectory, be sure to tell the patch
  user to specify a 
! .B \-p
  switch as needed.
  Third, you can create a file by sending out a diff that compares a
  null file to the file you want to create.
--- 330,336 ----
  context diff header, or with an Index: line.
  If you are patching something in a subdirectory, be sure to tell the patch
  user to specify a 
! .B -p
  switch as needed.
  Third, you can create a file by sending out a diff that compares a
  null file to the file you want to create.
***************
*** 423,429 ****
  .I patch
  couldn't parse your patch file.
  .PP
! The message \*(L"Hmm...\*(R" indicates that there is unprocessed text in
  the patch file and that
  .I patch
  is attempting to intuit whether there is a patch in that text and, if so,
--- 346,352 ----
  .I patch
  couldn't parse your patch file.
  .PP
! The message "Hmm..." indicates that there is unprocessed text in
  the patch file and that
  .I patch
  is attempting to intuit whether there is a patch in that text and, if so,
***************
*** 436,443 ****
  .SH CAVEATS
  .I Patch
  cannot tell if the line numbers are off in an ed script, and can only detect
! bad line numbers in a normal diff when it finds a \*(L"change\*(R" or
! a \*(L"delete\*(R" command.
  A context diff using fuzz factor 3 may have the same problem.
  Until a suitable interactive interface is added, you should probably do
  a context diff in these cases to see if the changes made sense.
--- 359,366 ----
  .SH CAVEATS
  .I Patch
  cannot tell if the line numbers are off in an ed script, and can only detect
! bad line numbers in a normal diff when it finds a "change" or
! a "delete" command.
  A context diff using fuzz factor 3 may have the same problem.
  Until a suitable interactive interface is added, you should probably do
  a context diff in these cases to see if the changes made sense.
***************
*** 464,467 ****
  .I patch
  will think it is a reversed patch, and offer to un-apply the patch.
  This could be construed as a feature.
- .rn }` ''
--- 387,389 ----