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Diff for /src/usr.bin/m4/m4.1 between version 1.32 and 1.33

version 1.32, 2003/06/10 09:12:10 version 1.33, 2003/06/27 21:22:52
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 .Pp  .Pp
 There cannot be any space following the macro name and the open  There cannot be any space following the macro name and the open
 parenthesis  parenthesis
 .Pq Ql ( .  .Pq Sq ( .
 If the macro name is not followed by an open  If the macro name is not followed by an open
 parenthesis it is processed with no arguments.  parenthesis it is processed with no arguments.
 .Pp  .Pp
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 .Dq [a-zA-Z_][a-zA-Z0-9_]* .  .Dq [a-zA-Z_][a-zA-Z0-9_]* .
 .Pp  .Pp
 In arguments to macros, leading unquoted space, tab, and newline  In arguments to macros, leading unquoted space, tab, and newline
 .Pq Ql \en  .Pq Sq \en
 characters are ignored.  characters are ignored.
 To quote strings, use left and right single  To quote strings, use left and right single quotes
 quotes (e.g.,  .Po e.g.,\ \&
 .Ql "\ this is a string with a leading space" ) .  .Sq "\ this is a string with a leading space"
   .Pc .
 You can change the quote characters with the  You can change the quote characters with the
 .Ic changequote  .Ic changequote
 built-in macro.  built-in macro.
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 .It Ic changecom  .It Ic changecom
 Change the start and end comment sequences.  Change the start and end comment sequences.
 The default is the pound sign  The default is the pound sign
 .Pq Ql #  .Pq Sq #
 and the newline character.  and the newline character.
 With no arguments comments are turned off.  With no arguments comments are turned off.
 The maximum length for a comment marker is five characters.  The maximum length for a comment marker is five characters.
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 Define a new macro named by the first argument to have the  Define a new macro named by the first argument to have the
 value of the second argument.  value of the second argument.
 Each occurrence of  Each occurrence of
 .Ql $n  .Sq $n
 (where  (where
 .Ar n  .Ar n
 is 0 through 9) is replaced by the  is 0 through 9) is replaced by the
 .Ar n Ns 'th  .Ar n Ns 'th
 argument.  argument.
 .Ql $0  .Sq $0
 is the name of the calling macro.  is the name of the calling macro.
 Undefined arguments are replaced by a null string.  Undefined arguments are replaced by a null string.
 .Ql $#  .Sq $#
 is replaced by the number of arguments;  is replaced by the number of arguments;
 .Ql $*  .Sq $*
 is replaced by all arguments comma separated;  is replaced by all arguments comma separated;
 .Ql $@  .Sq $@
 is the same as  is the same as
 .Ql $*  .Sq $*
 but all arguments are quoted against further expansion.  but all arguments are quoted against further expansion.
 .It Ic defn  .It Ic defn
 Returns the quoted definition for each argument.  Returns the quoted definition for each argument.
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 .It Ic esyscmd  .It Ic esyscmd
 Passes its first argument to a shell and returns the shell's standard output.  Passes its first argument to a shell and returns the shell's standard output.
 Note that the shell shares its standard input and standard error with  Note that the shell shares its standard input and standard error with
 .Nm  .Nm m4 .
 .It Ic eval  .It Ic eval
 Computes the first argument as an arithmetic expression using 32-bit  Computes the first argument as an arithmetic expression using 32-bit
 arithmetic.  arithmetic.
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 .It Ic patsubst  .It Ic patsubst
 Substitutes a regular expression in a string with a replacement string.  Substitutes a regular expression in a string with a replacement string.
 Usual substitution patterns apply: an ampersand  Usual substitution patterns apply: an ampersand
 .Pq Ql &  .Pq Sq \&&
 is replaced by the string matching the regular expression.  is replaced by the string matching the regular expression.
 The string  The string
 .Ql \e# ,  .Sq \e# ,
 where  where
 .Ql #  .Sq #
 is a digit, is replaced by the corresponding back-reference.  is a digit, is replaced by the corresponding back-reference.
 .It Ic popdef  .It Ic popdef
 Restores the  Restores the
Legend:
Removed from v.1.32  
changed lines
  Added in v.1.33