UNIFDEF(1) BSD Reference Manual UNIFDEF(1) NNAAMMEE uunniiffddeeff - remove ifdef'ed lines SSYYNNOOPPSSIISS uunniiffddeeff [--tt --ll --cc --DD_s_y_m --UU_s_y_m --iiDD_s_y_m --iiDD_s_y_m] _._._. [_f_i_l_e] DDEESSCCRRIIPPTTIIOONN UUnniiffddeeff is useful for removing ifdef'ed lines from a file while otherwise leaving the file alone. UUnniiffddeeff acts on #ifdef, #ifndef, #else, and #en- dif lines, and it knows only enough about C to know when one of these is inactive because it is inside a comment, or a single or double quote. Parsing for quotes is very simplistic: when it finds an open quote, it ignores everything (except escaped quotes) until it finds a close quote, and it will not complain if it gets to the end of a line and finds no backslash for continuation. Available options: --DD_s_y_m --UU_s_y_m Specify which symbols to define or undefine. and the lines in- side those ifdefs will be copied to the output or removed as ap- propriate. The ifdef, ifndef, else, and endif lines associated with _s_y_m will also be removed. Ifdefs involving symbols you don't specify and ``#if'' control lines are untouched and copied out along with their associated ifdef, else, and endif lines. If an ifdef X occurs nested inside another ifdef X, then the inside ifdef is treated as if it were an unrecognized symbol. If the same symbol appears in more than one argument, the last occur- rence dominates. --cc If the --cc flag is specified, then the operation of uunniiffddeeff is complemented, i.e. the lines that would have been removed or blanked are retained and vice versa. --ll Replace removed lines with blank lines instead of deleting them. --tt Disables parsing for C comments and quotes useful for plain text (not C code). --iiDD_s_y_m --iiUU_s_y_m Ignore ifdefs. If your C code uses ifdefs to delimit non-C lines, such as comments or code which is under construction, then you must tell uunniiffddeeff which symbols are used for that purpose so that it won't try to parse for quotes and comments inside those ifdefs. One specifies ignored ifdefs with --iiDD_s_y_m and --iiUU_s_y_m sim- ilar to --DD_s_y_m and --UU_s_y_m above. UUnniiffddeeff copies its output to _s_t_d_o_u_t and will take its input from _s_t_d_i_n if no _f_i_l_e argument is given. UUnniiffddeeff works nicely with the --DD_s_y_m option added to diff(1) as of the 4.1 Berkeley Software Distribution. SSEEEE AALLSSOO diff(1) DDIIAAGGNNOOSSTTIICCSS Inappropriate else or endif. Premature EOF with line numbers of the unterminated #ifdefs. Exit status is 0 if output is exact copy of input, 1 if not, 2 if trou- ble. BBUUGGSS Should try to deal with ``#if'' lines. Doesn't work correctly if input contains null characters. HHIISSTTOORRYY The uunniiffddeeff command appeared in 4.3BSD. 4.3 Berkeley Distribution June 6, 1993 2