Iconv conversion issues with CRLF in C

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Some network protocols such as http want line ends to be terminated with the traditional MS-DOS/Windows CRLF line wrap. When programming on OS/400 in C, communications to/from the outside world must additionally converted from EBDIC to ASCII and backwards with the standard C library iconv() function.

Using the default compiler settings in at least V4R5 converts the CR to ASCII 0x0d as to be expected, but converts a LF to 0x85[1] instead of 0x0a. Network packet dumps hence show the result as 0x0d 0x85, which is not the expected sequence.

Setting the compiler option sysifcopt(*ifsio) fixes this behavior.

Excerpt from the ILE C Programmer’s Guide, Chapter Text Streams and Binary Streams:

Note: The *IFSIO option also changes the value for the ’\n’ escape character value to the 0x25 line feed character. If *NOIFSIO is specified, the ’\n’ escape character has a value of 0x15.

Weblinks

Footnotes

  1. ↑ The ASCII Next Line (NEL) control character.
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