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Top Forums Programming How to trim the white space around a string in C program Post 302244881 by rmh on Wednesday 8th of October 2008 11:44:43 PM
Old 10-09-2008
I should have mentioned that whitespace is considered to be any of the following characters:

0x09 - horizontal tab
0x0a - linefeed
0x0b - vertical tab
0x0c - form feed
0x0d - carriage return
0x20 - space

so keep that in mind when you program for trimming whitespace...
 

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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-terminated 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 o While can be used to add new headers, it is more efficient to use o A filter that calls must set the flag in the structure passed to o The filter order is important for Filter placed later in the sequence will observer the changes already done by earlier filters. o 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 in C) followed by at least one whitespace character, such as, a space (ASCII 0x20) or tab (ASCII 0x09, or 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: o headerf contains a NULL value. o Modifying headers in the current connection state is invalid. o Memory allocation fails. o Network error occurs. o 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_delrcpt(3N), smfi_replacebody(3N). on smfi_chgheader()(3N)
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