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Full Discussion: offset - informix chunk
Top Forums UNIX for Dummies Questions & Answers offset - informix chunk Post 33944 by shibz on Monday 27th of January 2003 07:34:03 AM
Old 01-27-2003
offset - informix chunk

Hello all,

I am trying to add chunks to my informix dataspace. I have one dataspace ( the rootdbs ) and the new chunk is a raw device. Precisely slice1 on my new external harddisk.

The question is, what should be the offset value. The document says, the offset is used by the engine to identify the beginning of the file. Can I give some arbitary value, so that it skips the initial blocks ( like 300 ). Or is there any logical method to identify the best offset ?

The informix version is 5.1 and platform is Sun OS 5.5.1

Thanks in advance.
 

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ICONV_SUBSTR(3) 							 1							   ICONV_SUBSTR(3)

iconv_substr - Cut out part of a string

SYNOPSIS
string iconv_substr (string $str, int $offset, [int $length = iconv_strlen($str, $charset)], [string $charset = ini_get("iconv.inter- nal_encoding")]) DESCRIPTION
Cuts a portion of $str specified by the $offset and $length parameters. PARAMETERS
o $str - The original string. o $offset - If $offset is non-negative, iconv_substr(3) cuts the portion out of $str beginning at $offset'th character, counting from zero. If $offset is negative, iconv_substr(3) cuts out the portion beginning at the position, $offset characters away from the end of $str. o $length - If $length is given and is positive, the return value will contain at most $length characters of the portion that begins at $offset (depending on the length of $string). If negative $length is passed, iconv_substr(3) cuts the portion out of $str from the $offset'th character up to the character that is $length characters away from the end of the string. In case $offset is also negative, the start position is calculated beforehand according to the rule explained above. o $charset - If $charset parameter is omitted, $string are assumed to be encoded in iconv.internal_encoding. Note that $offset and $length parameters are always deemed to represent offsets that are calculated on the basis of the character set determined by $charset, whilst the counterpart substr(3) always takes these for byte offsets. RETURN VALUES
Returns the portion of $str specified by the $offset and $length parameters. If $str is shorter than $offset characters long, FALSE will be returned. SEE ALSO
substr(3), mb_substr(3), mb_strcut(3). PHP Documentation Group ICONV_SUBSTR(3)
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