From d1a72437ecac49c56d18c05b33cd734a29cc3c29 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Grubbstr=C3=B6m=20=28Grubba=29?=
<grubba@grubba.org>
Date: Mon, 22 Feb 1999 23:36:58 +0100
Subject: [PATCH] Added some notes on EBCDIC conversion.
Rev: src/cpp.c:1.38
---
src/cpp.c | 25 ++++++++++++++++++++++---
1 file changed, 22 insertions(+), 3 deletions(-)
diff --git a/src/cpp.c b/src/cpp.c
index 5718c210d7..9c701111fa 100644
--- a/src/cpp.c
+++ b/src/cpp.c
@@ -5,7 +5,7 @@
\*/
/*
- * $Id: cpp.c,v 1.37 1999/02/22 21:35:28 grubba Exp $
+ * $Id: cpp.c,v 1.38 1999/02/22 22:36:58 grubba Exp $
*/
#include "global.h"
#include "language.h"
@@ -2103,8 +2103,12 @@ void f_cpp(INT32 args)
if ((!sp[-args].u.string->size_shift) && (sp[-args].u.string->len > 1)) {
/* Try to determine if we need to recode the string */
- /* At least a prefix of two bytes need to be 7bit in a valid
- * Pike program.
+ /* Observations:
+ *
+ * * At least a prefix of two bytes need to be 7bit in a valid
+ * Pike program.
+ *
+ * * NUL isn't valid in a Pike program.
*/
/* Heuristic:
*
@@ -2117,9 +2121,24 @@ void f_cpp(INT32 args)
* 0xfe | 0xff | 16bit Unicode string reverse byte order.
* 0x7b | 0x83 | EBCDIC-US ("#c").
* 0x7b | 0x40 | EBCDIC-US ("# ").
+ * 0x7b | 0x09 | EBCDIC-US ("#\t").
* --------+---------+------------------------------------------
* Other | Other | 8bit standard string.
*/
+ /* NOTE:
+ *
+ * * EBCDIC conversion needs to first convert the first line
+ * according to EBCDIC-US, and then the rest of the string
+ * according to the encoding specified by the first line.
+ *
+ * * It's an error for a program written in EBCDIC not to
+ * start with a #charset directive.
+ *
+ * Obfuscation note:
+ *
+ * * This still allows the rest of the file to be written in
+ * another encoding than EBCDIC.
+ */
}
init_string_builder(&this.buf, 0);
--
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