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35 .\" @(#)unifdef.1 8.2 (Berkeley) 4/1/94
43 .Nd remove ifdef'ed lines
57 is useful for removing ifdef'ed lines
58 from a file while otherwise leaving the file alone.
61 #ifdef, #ifndef, #else, and #endif lines,
62 and it knows only enough about C
63 to know when one of these is inactive
66 or a single or double quote.
67 Parsing for quotes is very simplistic:
68 when it finds an open quote,
69 it ignores everything (except escaped quotes)
70 until it finds a close quote, and
71 it will not complain if it gets
72 to the end of a line and finds no backslash for continuation.
75 .Bl -tag -width Ds -compact
78 Specify which symbols to define or undefine.
79 and the lines inside those ifdefs will be copied to the output or removed as
81 The ifdef, ifndef, else, and endif lines associated with
84 Ifdefs involving symbols you don't specify
85 and ``#if'' control lines
86 are untouched and copied out
87 along with their associated
88 ifdef, else, and endif lines.
89 If an ifdef X occurs nested inside another ifdef X, then the
90 inside ifdef is treated as if it were an unrecognized symbol.
91 If the same symbol appears in more than one argument,
92 the last occurrence dominates.
101 i.e. the lines that would have been removed or blanked
102 are retained and vice versa.
105 Replace removed lines with blank lines
106 instead of deleting them.
108 Disables parsing for C comments and quotes, which is useful
114 If your C code uses ifdefs to delimit non-C lines,
116 or code which is under construction,
119 which symbols are used for that purpose so that it won't try to parse
120 for quotes and comments
122 One specifies ignored ifdefs with
136 and will take its input from
143 works nicely with the
147 as of the 4.1 Berkeley Software Distribution.
151 Inappropriate else or endif.
155 with line numbers of the unterminated #ifdefs.
157 Exit status is 0 if output is exact copy of input, 1 if not, 2 if trouble.
159 Should try to deal with ``#if'' lines.
161 Doesn't work correctly if input contains null characters.