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Fix IBM-1047 atoe: map ASCII LF (0x0A) to EBCDIC NEL (0x15) #35

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Merged
mgrossmann merged 1 commit into from
Mar 21, 2026
Merged

Fix IBM-1047 atoe: map ASCII LF (0x0A) to EBCDIC NEL (0x15) #35

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16 changes: 10 additions & 6 deletions src/httpxlat.c
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Original file line number Diff line number Diff line change
Expand Up @@ -145,17 +145,21 @@ static const unsigned char cp037_etoa[256] = {
/* ------------------------------------------------------------------ */
/* IBM Code Page 1047 (Latin-1 / Open Systems) */
/* */
/* Asymmetric NL/LF mapping (the well-known 1047 problem): */
/* ASCII LF (0x0A) -> EBCDIC LF (0x25) */
/* EBCDIC NEL(0x15) -> ASCII LF (0x0A) <- NB: NOT symmetric */
/* EBCDIC LF (0x25) -> ASCII NEL (0x85) <- NB: NOT symmetric */
/* NL/LF mapping — modified from pure IBM-1047: */
/* ASCII LF (0x0A) -> EBCDIC NEL (0x15) <- override for ecosystem */
/* EBCDIC NEL(0x15) -> ASCII LF (0x0A) <- symmetric roundtrip */
/* EBCDIC LF (0x25) -> ASCII NEL (0x85) <- unchanged */
/* */
/* Tables from mvsMF (verified, in production). */
/* Pure IBM-1047 maps ASCII LF to EBCDIC LF (0x25), but the */
/* mvslovers ecosystem uses NEL (0x15) as newline: c2asm370 '\n', */
/* crent370 printf, and all UFS files written by C programs emit */
/* 0x15. This override makes atoe consistent with that convention. */
/* z/OS USS applies the same override internally. */
/* ------------------------------------------------------------------ */

static const unsigned char ibm1047_atoe[256] = {
/* 0x00-0x07 */ 0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F,
/* 0x08-0x0F */ 0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
/* 0x08-0x0F */ 0x16, 0x05, 0x15, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
/* 0x10-0x17 */ 0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26,
/* 0x18-0x1F */ 0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
/* 0x20-0x27 sp ! " # $ % & ' */
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