===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/patch/patch.1,v
retrieving revision 1.8
retrieving revision 1.9
diff -u -r1.8 -r1.9
--- src/usr.bin/patch/patch.1	2003/07/22 20:17:06	1.8
+++ src/usr.bin/patch/patch.1	2003/07/24 04:41:19	1.9
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: patch.1,v 1.8 2003/07/22 20:17:06 millert Exp $	-*- nroff -*-
+.\"	$OpenBSD: patch.1,v 1.9 2003/07/24 04:41:19 jmc Exp $
 .\" Copyright 1986, Larry Wall
 .\"
 .\" Redistribution and use in source and binary forms, with or without
@@ -19,127 +19,99 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.rn '' }`
-.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.
-'\"
-'\" Shut up a groff -ww warning.
-.if \n(.g .if !dTr .ds Tr
-.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
-.SH NAME
-patch - apply a diff file to an original
-.SH SYNOPSIS
-.B patch
-[options] [origfile [patchfile]]
-.sp
-but usually just
-.sp
-.B patch
-<patchfile
-.SH DESCRIPTION
-.I Patch
+.Dd July 23, 2003
+.Dt PATCH 1
+.Os
+.Sh NAME
+.Nm patch
+.Nd apply a diff file to an original
+.Sh SYNOPSIS
+.Nm patch
+.Op Cm options
+.Op Ar origfile Op Ar patchfile
+.Nm patch
+.Pf \*(Lt Ar patchfile
+.Sh DESCRIPTION
+.Nm
 will take a patch file containing any of the four forms of difference
 listing produced by the
-.I diff
-program and apply those differences to an original file, producing a patched
-version.
+.Xr diff 1
+program and apply those differences to an original file,
+producing a patched 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" (\*(L"~\*(R" on systems that do not
-support long filenames), or as specified by the
-.BR -b ,
-.BR -B ,
+the original file backed up to the same name with the extension
+.Qq .orig
+.Po
 or
-.B -V
+.Qq ~
+on systems that do not support long filenames
+.Pc ,
+or as specified by the
+.Fl b ,
+.Fl B ,
+or
+.Fl V
 switches.
 The extension used for making backup files may also be specified in the
-.B SIMPLE_BACKUP_SUFFIX
+.Ev SIMPLE_BACKUP_SUFFIX
 environment variable, which is overridden by the above switches.
-.PP
+.Pp
 If the backup file already exists,
-.B patch
+.Nm
 creates a new backup file name by changing the first lowercase letter
-in the last component of the file's name into uppercase.  If there are
-no more lowercase letters in the name, it removes the first character
-from the name.  It repeats this process until it comes up with a
+in the last component of the file's name into uppercase.
+If there are no more lowercase letters in the name,
+it removes the first character from the name.
+It repeats this process until it comes up with a
 backup file that does not already exist.
-.PP
-You may also specify where you want the output to go with a
-.B -o
+.Pp
+You may also specify where you want the output to go with the
+.Fl o
 switch; if that file already exists, it is backed up first.
-.PP
+.Pp
 If
-.I patchfile
+.Ar patchfile
 is omitted, or is a hyphen, the patch will be read from standard input.
-.PP
-Upon startup, patch will attempt to determine the type of the diff listing,
+.Pp
+Upon startup,
+.Nm
+will attempt to determine the type of the diff listing,
 unless over-ruled by a
-.BR -c ,
-.BR -e ,
-.BR -n ,
+.Fl c ,
+.Fl e ,
+.Fl n ,
 or
-.B -u
+.Fl u
 switch.
 Context diffs (old-style, new-style, and unified) and
 normal diffs are applied by the
-.I patch
+.Nm
 program itself, while ed diffs are simply fed to the
-.I ed
+.Xr ed 1
 editor via a pipe.
-.PP
-.I Patch
+.Pp
+.Nm
 will try to skip any leading garbage, apply the diff,
 and then skip any trailing garbage.
 Thus you could feed an article or message containing a
 diff listing to
-.IR patch ,
+.Nm patch ,
 and it should work.
 If the entire diff is indented by a consistent amount,
 this will be taken into account.
-.PP
+.Pp
 With context diffs, and to a lesser extent with normal diffs,
-.I patch
+.Nm
 can detect when the line numbers mentioned in the patch are incorrect,
 and will attempt to find the correct place to apply each hunk of the patch.
 As a first guess, it takes the line number mentioned for the hunk, plus or
 minus any offset used in applying the previous hunk.
 If that is not the correct place,
-.I patch
+.Nm
 will scan both forwards and backwards for a set of lines matching the context
 given in the hunk.
 First
-.I patch
+.Nm
 looks for a place where all lines of the context match.
 If no such place is found, and it's a context diff, and the maximum fuzz factor
 is set to 1 or more, then another scan takes place ignoring the first and last
@@ -147,233 +119,253 @@
 If that fails, and the maximum fuzz factor is set to 2 or more,
 the first two and last two lines of context are ignored,
 and another scan is made.
-(The default maximum fuzz factor is 2.)
+.Pq The default maximum fuzz factor is 2.
+.Pp
 If
-.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" (\*(L"#\*(R" on systems that do not support
-long filenames).
+.Nm
+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
+.Qq .rej
+.Po
+or
+.Qq #
+on systems that do not support long filenames
+.Pc .
 (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.)
 The line numbers on the hunks in the reject file may be different than
 in the patch file: they reflect the approximate location patch thinks the
 failed hunks belong in the new file rather than the old one.
-.PP
+.Pp
 As each hunk is completed, you will be told whether the hunk succeeded or
 failed, and which line (in the new file)
-.I patch
+.Nm
 thought the hunk should go on.
-If this is different from the line number specified in the diff you will
-be told the offset.
+If this is different from the line number specified in the diff,
+you will be told the offset.
 A single large offset MAY be an indication that a hunk was installed in the
 wrong place.
 You will also be told if a fuzz factor was used to make the match, in which
 case you should also be slightly suspicious.
-.PP
+.Pp
 If no original file is specified on the command line,
-.I patch
+.Nm
 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"
+with
+.Qq ***
+or
+.Qq --- ,
+with the shortest name of an existing file winning.
+Only context diffs have lines like that, but if there is an
+.Qq Index:
 line in the leading garbage,
-.I patch
+.Nm
 will try to use the filename from that line.
 The context diff header takes precedence over an Index line.
 If no filename can be intuited from the leading garbage, you will be asked
 for the name of the file to patch.
-.PP
+.Pp
 If the original file cannot be found or is read-only, but a suitable
 SCCS or RCS file is handy,
-.I patch
+.Nm
 will attempt to get or check out the file.
-.PP
-Additionally, if the leading garbage contains a \*(L"Prereq: \*(R" line,
-.I patch
+.Pp
+Additionally, if the leading garbage contains a
+.Qq Prereq:\ \&
+line,
+.Nm
 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.
 If not,
-.I patch
+.Nm
 will ask for confirmation before proceeding.
-.PP
+.Pp
 The upshot of all this is that you should be able to say, while in a news
 interface, the following:
-.Sp
-	| patch -d /usr/src/local/blurfl
-.Sp
+.Pp
+.Dl | patch -d /usr/src/local/blurfl
+.Pp
 and patch a file in the blurfl directory directly from the article containing
 the patch.
-.PP
+.Pp
 If the patch file contains more than one patch,
-.I patch
+.Nm
 will try to apply each of them as if they came from separate patch files.
 This means, among other things, that it is assumed that the name of the file
 to patch must be determined for each diff listing,
 and that the garbage before each diff listing will
 be examined for interesting things such as filenames and revision level, as
 mentioned previously.
-.PP
-.I Patch
+.Pp
+.Nm
 recognizes the following switches:
-.TP 5
-.B \-b or \-\-suffix
-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 or \-\-prefix
-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.
-.TP 5
-.B \-c or \-\-context
-forces
-.I patch
+.Bl -tag -width Ds
+.It Fl b , Fl Fl suffix
+Causes the next argument to be interpreted as the backup extension, to be
+used in place of
+.Qq .orig
+or
+.Qq ~ .
+.It Fl B , Fl Fl prefix
+Causes the next argument to be interpreted as a prefix to the backup file
+name.
+If this argument is specified, any argument from
+.Fl b
+will be ignored.
+.It Fl c , Fl Fl context
+Forces
+.Nm
 to interpret the patch file as a context diff.
-.TP 5
-.B \-C or \-\-check
-checks that the patch would apply cleanly, but does not modify anything.
-.TP 5
-.B \-d or \-\-directory
-causes
-.I patch
-to interpret the next argument as a directory, and cd to it before doing
-anything else.
-.TP 5
-.B \-D or \-\-ifdef
-causes
-.I patch
-to use the "#ifdef...#endif" construct to mark changes.
+.It Fl C , Fl Fl check
+Checks that the patch would apply cleanly, but does not modify anything.
+.It Fl d , Fl Fl directory
+Causes
+.Nm
+to interpret the next argument as a directory, and
+.Xr cd 1
+to it before doing anything else.
+.It Fl D , Fl Fl ifdef
+Causes
+.Nm
+to use the
+.Qq #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
+.Fl D
 and the argument.
-.TP 5
-.B \-e or \-\-ed
-forces
-.I patch
-to interpret the patch file as an ed script.
-.TP 5
-.B \-E or \-\-remove-empty-files
-causes
-.I patch
+.It Fl e , Fl Fl ed
+Forces
+.Nm
+to interpret the patch file as an
+.Xr ed 1
+script.
+.It Fl E , Fl Fl remove-empty-files
+Causes
+.Nm
 to remove output files that are empty after the patches have been applied.
-.TP 5
-.B \-f or \-\-force
-forces
-.I patch
+.It Fl f , Fl Fl force
+Forces
+.Nm
 to assume that the user knows exactly what he or she is doing, and to not
-ask any questions.  It assumes the following: skip patches for which a
-file to patch can't be found; patch files even though they have the
-wrong version for the ``Prereq:'' line in the patch; and assume that
-patches are not reversed even if they look like they are.
+ask any questions.
+It assumes the following:
+skip patches for which a file to patch can't be found;
+patch files even though they have the wrong version for the
+.Qq Prereq:
+line in the patch;
+and assume that patches are not reversed even if they look like they are.
 This option does not suppress commentary; use
-.B \-s
+.Fl s
 for that.
-.TP 5
-.B \-t or \-\-batch
-similar to
-.BR \-f ,
+.It Fl t , Fl Fl batch
+Similar to
+.Fl f ,
 in that it suppresses questions, but makes some different assumptions:
-skip patches for which a file to patch can't be found (the same as \fB\-f\fP);
-skip patches for which the file has the wrong version for the ``Prereq:'' line
-in the patch; and assume that patches are reversed if they look like
-they are.
-.TP 5
-.B \-F<number> or \-\-fuzz <number>
-sets the maximum fuzz factor.
+skip patches for which a file to patch can't be found (the same as
+.Fl f ) ;
+skip patches for which the file has the wrong version for the
+.Qq Prereq:
+line in the patch;
+and assume that patches are reversed if they look like they are.
+.It Xo
+.Fl F Ns Aq Ar number ,
+.Fl Fl fuzz Aq Ar number
+.Xc
+Sets the maximum fuzz factor.
 This switch only applies to context diffs, and causes
-.I patch
+.Nm
 to ignore up to that many lines in looking for places to install a hunk.
 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 or \-\-ignore-whitespace
-causes the pattern matching to be done loosely, in case the tabs and
+.It Fl l , Fl Fl ignore-whitespace
+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
 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 or \-\-normal
-forces
-.I patch
+.It Fl n , Fl Fl normal
+Forces
+.Nm
 to interpret the patch file as a normal diff.
-.TP 5
-.B \-N or \-\-forward
-causes
-.I patch
+.It Fl N , Fl Fl forward
+Causes
+.Nm
 to ignore patches that it thinks are reversed or already applied.
 See also
-.B \-R .
-.TP 5
-.B \-o or \-\-output
-causes the next argument to be interpreted as the output file name.
-.TP 5
-.B \-p<number> or \-\-strip <number>
-sets the pathname strip count,
-which controls how pathnames found in the patch file are treated, in case
-you keep your files in a different directory than the person who sent
+.Fl R .
+.It Fl o , Fl Fl output
+Causes the next argument to be interpreted as the output file name.
+.It Xo
+.Fl p Ns Aq Ar number ,
+.Fl Fl strip Aq Ar number
+.Xc
+Sets the pathname strip count,
+which controls how pathnames found in the patch file are treated,
+in case you keep your files in a different directory than the person who sent
 out the patch.
 The strip count specifies how many slashes are to be stripped from
 the front of the pathname.
 (Any intervening directory names also go away.)
 For example, supposing the filename in the patch file was
-.sp
-	/u/howard/src/blurfl/blurfl.c
-.sp
-setting
-.B \-p
+.Pa /u/howard/src/blurfl/blurfl.c :
+.Pp
+Setting
+.Fl p
 or
-.B \-p0
-gives the entire pathname unmodified,
-.B \-p1
+.Fl p Ns Ar 0
+gives the entire pathname unmodified.
+.Pp
+.Fl p Ns Ar 1
 gives
-.sp
-	u/howard/src/blurfl/blurfl.c
-.sp
-without the leading slash,
-.B \-p4
+.Pp
+.D1 Pa u/howard/src/blurfl/blurfl.c
+.Pp
+without the leading slash.
+.Pp
+.Fl p Ns Ar 4
 gives
-.sp
-	blurfl/blurfl.c
-.sp
-and not specifying
-.B \-p
-at all just gives you "blurfl.c", unless all of the directories in the
-leading path (u/howard/src/blurfl) exist and that path is relative,
+.Pp
+.D1 Pa blurfl/blurfl.c
+.Pp
+Not specifying
+.Fl p
+at all just gives you
+.Pa blurfl.c ,
+unless all of the directories in the leading path
+.Pq Pa u/howard/src/blurfl
+exist and that path is relative,
 in which case you get the entire pathname unmodified.
 Whatever you end up with is looked for either in the current directory,
 or the directory specified by the
-.B \-d
+.Fl d
 switch.
-.TP 5
-.B \-r or \-\-reject-file
-causes the next argument to be interpreted as the reject file name.
-.TP 5
-.B \-R or \-\-reverse
-tells
-.I patch
+.It Fl r , Fl Fl reject-file
+Causes the next argument to be interpreted as the reject file name.
+.It Fl R , Fl Fl reverse
+Tells
+.Nm
 that this patch was created with the old and new files swapped.
 (Yes, I'm afraid that does happen occasionally, human nature being what it
 is.)
-.I Patch
+.Nm
 will attempt to swap each hunk around before applying it.
 Rejects will come out in the swapped format.
 The
-.B \-R
+.Fl R
 switch will not work with ed diff scripts because there is too little
 information to reconstruct the reverse operation.
-.Sp
+.Pp
 If the first hunk of a patch fails,
-.I patch
+.Nm
 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
+.Fl 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
@@ -383,151 +375,168 @@
 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 or \-\-quiet or \-\-silent
-makes
-.I patch
+.It Xo
+.Fl s , Fl Fl quiet ,
+.Fl Fl silent
+.Xc
+Makes
+.Nm
 do its work silently, unless an error occurs.
-.TP 5
-.B \-u or \-\-unified
-forces
-.I patch
+.It Fl u , Fl Fl unified
+Forces
+.Nm
 to interpret the patch file as a unified context diff (a unidiff).
-.TP 5
-.B \-v or \-\-version
-causes
-.I patch
+.It Fl v , Fl Fl version
+Causes
+.Nm
 to print out its revision header and patch level.
-.TP 5
-.B \-V or \-\-version-control
-causes the next argument to be interpreted as a method for creating
-backup file names.  The type of backups made can also be given in the
-.B VERSION_CONTROL
+.It Fl V , Fl Fl version-control
+Causes the next argument to be interpreted as a method for creating
+backup file names.
+The type of backups made can also be given in the
+.Ev VERSION_CONTROL
 environment variable, which is overridden by this option.
 The
-.B -B
+.Fl B
 option overrides this option, causing the prefix to always be used for
 making backup file names.
 The value of the
-.B VERSION_CONTROL
+.Ev VERSION_CONTROL
 environment variable and the argument to the
-.B -V
-option are like the GNU
-Emacs `version-control' variable; they also recognize synonyms that
-are more descriptive.  The valid values are (unique abbreviations are
-accepted):
-.RS
-.TP
-`t' or `numbered'
+.Fl V
+option are like the GNU Emacs
+.Dq version-control
+variable; they also recognize synonyms that are more descriptive.
+The valid values are (unique abbreviations are accepted):
+.Bl -tag -width Ds -offset indent
+.It t , numbered
 Always make numbered backups.
-.TP
-`nil' or `existing'
-Make numbered backups of files that already
-have them, simple backups of the others.
+.It nil , existing
+Make numbered backups of files that already have them,
+simple backups of the others.
 This is the default.
-.TP
-`never' or `simple'
+.It never , simple
 Always make simple backups.
-.RE
-.TP 5
-.B \-x<number> or \-\-debug <number>
-sets internal debugging flags, and is of interest only to
-.I patch
+.El
+.It Xo
+.Fl x Ns Aq Ar number ,
+.Fl Fl debug Aq Ar number
+.Xc
+Sets internal debugging flags, and is of interest only to
+.Nm
 patchers.
-.SH AUTHOR
-Larry Wall <lwall@netlabs.com>
-.br
-with many other contributors.
-.SH ENVIRONMENT
-.TP
-.B TMPDIR
-Directory to put temporary files in; default is /tmp.
-.TP
-.B SIMPLE_BACKUP_SUFFIX
-Extension to use for backup file names instead of \*(L".orig\*(R" or
-\*(L"~\*(R".
-.TP
-.B VERSION_CONTROL
-Selects when numbered backup files are made.
-.SH FILES
-$TMPDIR/patch*
-.SH SEE ALSO
-diff(1)
-.SH NOTES FOR PATCH SENDERS
+.El
+.Sh NOTES FOR PATCH SENDERS
 There are several things you should bear in mind if you are going to
-be sending out patches.
-First, you can save people a lot of grief by keeping a patchlevel.h file
-which is patched to increment the patch level as the first diff in the
+be sending out patches:
+.Pp
+First, you can save people a lot of grief by keeping a
+.Pa patchlevel.h
+file which is patched to increment the patch level as the first diff in the
 patch file you send out.
-If you put a Prereq: line in with the patch, it won't let them apply
+If you put a
+.Qq Prereq:
+line in with the patch, it won't let them apply
 patches out of order without some warning.
+.Pp
 Second, make sure you've specified the filenames right, either in a
-context diff header, or with an Index: line.
+context diff header, or with an
+.Qq Index:
+line.
 If you are patching something in a subdirectory, be sure to tell the patch
 user to specify a
-.B \-p
+.Fl p
 switch as needed.
+.Pp
 Third, you can create a file by sending out a diff that compares a
 null file to the file you want to create.
 This will only work if the file you want to create doesn't exist already in
 the target directory.
+.Pp
 Fourth, take care not to send out reversed patches, since it makes people wonder
 whether they already applied the patch.
+.Pp
 Fifth, while you may be able to get away with putting 582 diff listings into
 one file, it is probably wiser to group related patches into separate files in
 case something goes haywire.
-.SH DIAGNOSTICS
+.Sh ENVIRONMENT
+.Bl -tag -width "SIMPLE_BACKUP_SUFFIX" -compact
+.It Ev TMPDIR
+Directory to put temporary files in; default is
+.Pa /tmp .
+.It Ev SIMPLE_BACKUP_SUFFIX
+Extension to use for backup file names instead of
+.Qq .orig
+or
+.Qq ~ .
+.It Ev VERSION_CONTROL
+Selects when numbered backup files are made.
+.El
+.Sh FILES
+.Bl -tag -width Ds
+.It Pa $TMPDIR/patch*
+.El
+.Sh DIAGNOSTICS
 Too many to list here, but generally indicative that
-.I patch
+.Nm
 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
+.Pp
+The message
+.Qq Hmm...
+indicates that there is unprocessed text in the patch file and that
+.Nm
 is attempting to intuit whether there is a patch in that text and, if so,
 what kind of patch it is.
-.PP
-.I Patch
+.Pp
+.Nm
 will exit with a non-zero status if any reject files were created.
 When applying a set of patches in a loop it behooves you to check this
 exit status so you don't apply a later patch to a partially patched file.
-.SH CAVEATS
-.I Patch
+.Sh SEE ALSO
+.Xr diff 1
+.Sh AUTHORS
+.An Larry Wall Aq lwall@netlabs.com
+with many other contributors.
+.Sh CAVEATS
+.Nm
 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.
+bad line numbers in a normal diff when it finds a
+.Qq change
+or a
+.Qq 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.
 Of course, compiling without errors is a pretty good indication that the patch
 worked, but not always.
-.PP
-.I Patch
+.Pp
+.Nm
 usually produces the correct results, even when it has to do a lot of
 guessing.
 However, the results are guaranteed to be correct only when the patch is
 applied to exactly the same version of the file that the patch was
 generated from.
-.SH BUGS
-Could be smarter about partial matches, excessively \&deviant offsets and
+.Sh BUGS
+Could be smarter about partial matches, excessively deviant offsets and
 swapped code, but that would take an extra pass.
-.PP
-Check patch mode (
-.BR -C )
+.Pp
+Check patch mode
+.Pq Fl C
 will fail if you try to check several patches in succession that build on
-each other.  The whole code of
-.I patch
+each other.
+The whole code of
+.Nm
 would have to be restructured to keep temporary files around so that it can
 handle this situation.
-.PP
+.Pp
 If code has been duplicated (for instance with #ifdef OLDCODE ... #else ...
 #endif),
-.I patch
+.Nm
 is incapable of patching both versions, and, if it works at all, will likely
 patch the wrong one, and tell you that it succeeded to boot.
-.PP
+.Pp
 If you apply a patch you've already applied,
-.I patch
+.Nm
 will think it is a reversed patch, and offer to un-apply the patch.
 This could be construed as a feature.
-.rn }` ''