Annotation of src/usr.bin/unifdef/unifdef.1, Revision 1.2
1.2 ! deraadt 1: .\" $OpenBSD: unifdef.1,v 1.4 1994/12/07 00:33:48 jtc Exp $
1.1 deraadt 2: .\" $NetBSD: unifdef.1,v 1.4 1994/12/07 00:33:48 jtc Exp $
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38: .\" @(#)unifdef.1 8.2 (Berkeley) 4/1/94
39: .\"
40: .Dd April 1, 1994
41: .Dt UNIFDEF 1
42: .Os BSD 4.3
43: .Sh NAME
44: .Nm unifdef
45: .Nd remove ifdef'ed lines
46: .Sh SYNOPSIS
47: .Nm unifdef
48: .Op Fl clt
49: .Oo
50: .Fl D Ns Ar sym
51: .Fl U Ns Ar sym
52: .Fl iD Ns Ar sym
53: .Fl iD Ns Ar sym
54: .Oc
55: .Ar ...
56: .Op Ar file
57: .Sh DESCRIPTION
58: .Nm Unifdef
59: is useful for removing ifdef'ed lines
60: from a file while otherwise leaving the file alone.
61: .Nm Unifdef
62: acts on
63: #ifdef, #ifndef, #else, and #endif lines,
64: and it knows only enough about C
65: to know when one of these is inactive
66: because it is inside
67: a comment,
68: or a single or double quote.
69: Parsing for quotes is very simplistic:
70: when it finds an open quote,
71: it ignores everything (except escaped quotes)
72: until it finds a close quote, and
73: it will not complain if it gets
74: to the end of a line and finds no backslash for continuation.
75: .Pp
76: Available options:
77: .Bl -tag -width Ds -compact
78: .It Fl D Ns Ar sym
79: .It Fl U Ns Ar sym
80: Specify which symbols to define or undefine.
81: and the lines inside those ifdefs will be copied to the output or removed as
82: appropriate.
83: The ifdef, ifndef, else, and endif lines associated with
84: .Ar sym
85: will also be removed.
86: Ifdefs involving symbols you don't specify
87: and ``#if'' control lines
88: are untouched and copied out
89: along with their associated
90: ifdef, else, and endif lines.
91: If an ifdef X occurs nested inside another ifdef X, then the
92: inside ifdef is treated as if it were an unrecognized symbol.
93: If the same symbol appears in more than one argument,
94: the last occurrence dominates.
95: .Pp
96: .It Fl c
97: If the
98: .Fl c
99: flag is specified,
100: then the operation of
101: .Nm unifdef
102: is complemented,
103: i.e. the lines that would have been removed or blanked
104: are retained and vice versa.
105: .Pp
106: .It Fl l
107: Replace removed lines with blank lines
108: instead of deleting them.
109: .It Fl t
110: Disables parsing for C comments and quotes, which is useful
111: for plain text.
112: .Pp
113: .It Fl iD Ns Ar sym
114: .It Fl iU Ns Ar sym
115: Ignore ifdefs.
116: If your C code uses ifdefs to delimit non-C lines,
117: such as comments
118: or code which is under construction,
119: then you must tell
120: .Nm unifdef
121: which symbols are used for that purpose so that it won't try to parse
122: for quotes and comments
123: inside those ifdefs.
124: One specifies ignored ifdefs with
125: .Fl iD Ns Ar sym
126: and
127: .Fl iU Ns Ar sym
128: similar to
129: .Fl D Ns Ar sym
130: and
131: .Fl U Ns Ar sym
132: above.
133: .El
134: .Pp
135: .Nm Unifdef
136: copies its output to
137: .Em stdout
138: and will take its input from
139: .Em stdin
140: if no
141: .Ar file
142: argument is given.
143: .Pp
144: .Nm Unifdef
145: works nicely with the
146: .Fl D Ns Ar sym
147: option added to
148: .Xr diff 1
149: as of the 4.1 Berkeley Software Distribution.
150: .Sh SEE ALSO
151: .Xr diff 1
152: .Sh DIAGNOSTICS
153: Inappropriate else or endif.
154: .br
155: Premature
156: .Tn EOF
157: with line numbers of the unterminated #ifdefs.
158: .Pp
159: Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
160: .Sh BUGS
161: Should try to deal with ``#if'' lines.
162: .Pp
163: Doesn't work correctly if input contains null characters.
164: .Sh HISTORY
165: The
166: .Nm
167: command appeared in
168: .Bx 4.3 .
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