smfi_chgheader man page on HP-UX

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smfi_chgheader()(3N)					  smfi_chgheader()(3N)

NAME
       smfi_chgheader() - changes or deletes a sendmail message header

SYNOPSIS
PARAMETERS
       ctx	 Specifies the opaque context structure.

       headerf	 Specifies  the	 header name, which is a non-NULL, null-termi‐
		 nated string.

       hdridx	 Specifies the header index value (1-based).  A	 hdridx	 value
		 of  1	modifies  the  first  occurrence  of a header named If
		 hdridx is greater than the number of  times  appears,	a  new
		 copy of is added.

DESCRIPTION
       changes	the  value of a header for the current message.	 can be called
       only from the routine.

   Notes
       ·  While can be used to add new headers, it is more efficient to use

       ·  A filter that calls must set the flag in the structure passed to

       ·  The filter order  is	important  for	Filter	placed	later  in  the
	  sequence will observer the changes already done by earlier filters.

       ·  The  name  and the value of the header are not checked for standards
	  compliance.  However, each line of the header	 must  be  under  2048
	  characters.  If longer headers are needed, multi-line header must be
	  used.	 To make a multi-line header, insert a linefeed	 (ASCII	 0x0a,
	  or  \n in C) followed by at least one whitespace character, such as,
	  a space (ASCII 0x20) or tab (ASCII 0x09, or \t in C).	 The  linefeed
	  must not be preceded by a carriage return (ASCII 0x0d); the MTA adds
	  this automatically.  It is the responsibility of the	filter	writer
	  to ensure that standards are not violated.

RETURN VALUE
       returns due to the following reasons:

       ·  headerf contains a NULL value.
       ·  Modifying headers in the current connection state is invalid.
       ·  Memory allocation fails.
       ·  Network error occurs.
       ·  is not set when is called.

       returns on success.

EXAMPLES
AUTHOR
       was developed by the Sendmail Inc.

SEE ALSO
       smfi_addheader(3N),  smfi_insheader(3N),	 smfi_addrcpt(3N),  smfi_delr‐
       cpt(3N), smfi_replacebody(3N).

       on

							  smfi_chgheader()(3N)
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