Simple C fread and fseek to bulk read lines separated with a \n

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Here is simple file chunker that writes only complete complete records read in from a file to another file. For example, there are JSON records delimited with a '\' character and because they are variable in size, the buffer size WILL not align and therefore needs us to read X bytes, then walk backwards until we find the last complete record.

This requires us to use fseek (fseek(fp,i-tmp_bytes_read,SEEK_CUR);) to re-adjust the filepointer such that the next read will begin at the correct point.

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