READL SubroutineUsage:
s = READL(n [,size])
Description:
Reads a line of text (or data) from an open file. n must be a value returned by the OPEN subroutine. The optional size value is available in TBSVER 2 or later and limits the amount of data read. On failure this subroutine returns an empty string and sets member .errno containing the failure code to differentiate from a blank line being read.
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