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Diffstat (limited to 'ipl/packs/euler/ebcdic.icn')
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1 files changed, 157 insertions, 0 deletions
diff --git a/ipl/packs/euler/ebcdic.icn b/ipl/packs/euler/ebcdic.icn new file mode 100644 index 0000000..1dde431 --- /dev/null +++ b/ipl/packs/euler/ebcdic.icn @@ -0,0 +1,157 @@ +############################################################################ +# +# File: ebcdic.icn +# +# Subject: Procedures to convert between ASCII and EBCDIC +# +# Author: Alan Beale +# +# Date: March 31, 1990 +# +############################################################################ +# +# These procedures assist in use of the ASCII and EBCDIC character sets, +# regardless of the native character set of the host: +# +# Ascii128() Returns a 128-byte string of ASCII characters in +# numerical order. Ascii128() should be used in +# preference to &ascii for applications which might +# run on an EBCDIC host. +# +# Ascii256() Returns a 256-byte string representing the 256- +# character ASCII character set. On an EBCDIC host, +# the order of the second 128 characters is essentially +# arbitrary. +# +# Ebcdic() Returns a 256-byte string of EBCDIC characters in +# numerical order. +# +# AsciiChar(i) Returns the character whose ASCII representation is i. +# +# AsciiOrd(c) Returns the position of the character c in the ASCII +# collating sequence. +# +# EbcdicChar(i) Returns the character whose EBCDIC representation is i. +# +# EbcdicOrd(c) Returns the position of the character c in the EBCDIC +# collating sequence. +# +# MapEtoA(s) Maps a string of EBCDIC characters to the equivalent +# ASCII string, according to a plausible mapping. +# +# MapAtoE(s) Maps a string of ASCII characters to the equivalent +# EBCDIC string, according to a plausible mapping. +# +# Control(c) Returns the "control character" associated with the +# character c. On an EBCDIC host, with $ representing +# an EBCDIC character with no 7-bit ASCII equivalent, +# Control("$") may not be identical to "\^$", as +# translated by ICONT (and neither result is particularly +# meaningful). +# +############################################################################ +# +# Notes: +# +# There is no universally accepted mapping between ASCII and EBCDIC. +# See the SHARE Inc. publication "ASCII and EBCDIC Character Set and +# Code Issues in Systems Application Architecture" for more information +# than you would ever want to have on this subject. +# +# The mapping of the first 128 characters defined below by Ascii128() +# is the most commonly accepted mapping, even though it probably +# is not exactly like the mapping used by your favorite PC to mainframe +# file transfer utility. The mapping of the second 128 characters +# is quite arbitrary, except that where an alternate translation of +# ASCII char(n) is popular, this translation is assigned to +# Ascii256()[n+129]. +# +# The behavior of all functions in this package is controlled solely +# by the string literals in the _Eascii() procedure. Therefore you +# may modify these strings to taste, and still obtain consistent +# results, provided that each character appears exactly once in the +# result of _Eascii(). +# +# Yes, it's really true that the EBCDIC "\n" (NL, char(16r15)) is not +# the same as "\l" (LF, char(16r25)). How can that be? "Don't blame +# me, man, I didn't do it." +# +############################################################################ + +procedure _Eascii() + static EinAorder + initial + EinAorder := +# NUL SOH STX ETX EOT ENQ ACK BEL BS HT NL VT FF CR SO SI + "\x00\x01\x02\x03\x37\x2d\x2e\x2f\x16\x05\x15\x0b\x0c\x0d\x0e\x0f"|| +# DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US + "\x10\x11\x12\x13\x3c\x3d\x32\x26\x18\x19\x3f\x27\x1c\x1d\x1e\x1f"|| +# sp ! " # $ % & ' ( ) * + , - . / + "\x40\x5a\x7f\x7b\x5b\x6c\x50\x7d\x4d\x5d\x5c\x4e\x6b\x60\x4b\x61"|| +# 0 1 2 3 4 5 6 7 8 9 : ; < = > ? + "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\x7a\x5e\x4c\x7e\x6e\x6f"|| +# @ A B C D E F G H I J K L M N O + "\x7c\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xd1\xd2\xd3\xd4\xd5\xd6"|| +# P Q R S T U V W X Y Z $< \ $> ^ _ + "\xd7\xd8\xd9\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xad\xe0\xbd\x5f\x6d"|| +# ` a b c d e f g h i j k l m n o + "\x79\x81\x82\x83\x84\x85\x86\x87\x88\x89\x91\x92\x93\x94\x95\x96"|| +# p q r s t u v w x y z $( | $) ~ DEL + "\x97\x98\x99\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xc0\x4f\xd0\xa1\x07"|| + "\x04\x06\x08\x09\x0a\x14\x17\x1a\x1b\x20\x25\x21\x22\x23\x24\x28_ + \x29\x2a\x2b\x2c\x30\x31\x33\x34\x35\x36\x38\x39\x3a\x3b\x3e\xff_ + \x41\x42\x43\x44\x4a\x45\x46\x47\x48\x49\x51\x52\x53\x54\x55\x56_ + \x57\x58\x59\x62\x63\x64\x65\x66\x67\x68\x69\x70\x71\x72\x73\x74_ + \x75\x76\x77\x78\x80\x8a\x8c\x8d\x8e\x8f\x90\x9a\x9c\x9d\x9e\x9f_ + \xa0\xaa\xab\xac\xae\xaf\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9_ + \xba\xbb\xbc\xbe\xbf\xca\xcb\xcc\xcd\xce\xcf\xda\xdb\xdc\xdd\xde_ + \xdf\xe1\xea\xeb\xec\xed\xee\xef\xfa\xfb\xfc\x8b\x6a\x9b\xfd\xfe" + return EinAorder +end + +procedure Ascii128() + if "\l" == "\n" then return string(&ascii) + return _Eascii()[1+:128] +end + +procedure Ascii256() + if "\l" == "\n" then return string(&cset) + return _Eascii() +end + +procedure Ebcdic() + if "\l" ~== "\n" then return &cset + return map(&cset, _Eascii(), &cset) +end + +procedure AsciiChar(i) + if "\l" == "\n" then return char(i) + return _Eascii()[0 < i+1] | runerr(205,i) +end + +procedure AsciiOrd(c) + if "\l" == "\n" then return ord(c) + return ord(MapEtoA(c)) +end + +procedure EbcdicChar(i) + if "\l" ~== "\n" then return char(i) + return map(char(i), _Eascii(), &cset) +end + +procedure EbcdicOrd(c) + if "\l" ~== "\n" then return ord(c) + return ord(MapAtoE(c)) +end + +procedure MapEtoA(s) + return map(s, _Eascii(), &cset) +end + +procedure MapAtoE(s) + return map(s, &cset, _Eascii()) +end + +procedure Control(c) + return AsciiChar(iand(AsciiOrd(c),16r1f)) +end |