go-eol/readlfcr.go

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2024-02-18 18:07:49 +00:00
package eol
import (
"io"
"sourcecode.social/reiver/go-opt"
"sourcecode.social/reiver/go-eol/cr"
"sourcecode.social/reiver/go-eol/lf"
"sourcecode.social/reiver/go-eol/lfcr"
)
// ReadLFCR tries to read the "\r\n" (i.e., carriage-return line-feed) end-of-line sequence.
//
// If successful, it returns the number-of-bytes read (to read in end-of-line sequence "\r\n").
//
// If the first character read is not a '\n', then ReadLFCR will try to unread the character.
// If the second character read is not a '\r', then ReadLFCR will also try to unread the second character, but will not be able to unread the first character (i.e., '\n') it already read.
//
// Example usage:
//
// size, err := eol.ReadLFCR(runescanner)
func ReadLFCR(runescanner io.RuneScanner) (size int, err error) {
var size0 int
{
var err error
const characterNumber uint64 = 1
var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
size0, err = readthisrune(circumstance, runescanner, lf.Rune)
if nil != err {
return size0, err
}
}
var size1 int
{
var err error
const characterNumber uint64 = 2
var circumstance internalCircumstance = specifyCircumstance(opt.Something(lfcr.String), characterNumber)
size1, err = readthisrune(circumstance, runescanner, cr.Rune)
if nil != err {
return size1+size0, err
}
}
return size1+size0, nil
}