JehanneOS/mksh
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we absolutely require unambiguous mapping between EBCDIC and extended ASCII

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to be able to provide a global stronly monotonous order for comparisons and
bracket expression ranges
This commit is contained in:
tg 2017-05-03 21:50:33 +00:00
parent efa4d0d2cf
commit 01b0c107b5
1 changed files with 14 additions and 9 deletions
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23
shf.c
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@ -25,7 +25,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/shf.c,v 1.93 2017/05/03 17:51:06 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/shf.c,v 1.94 2017/05/03 21:50:33 tg Exp $");
/* flags to shf_emptybuf() */
#define EB_READSW 0x01 /* about to switch to reading */
@ -1234,7 +1234,7 @@ ebcdic_init(void)
{
int i = 256;
unsigned char t;
bool mapcache[128];
bool mapcache[256];
while (i--)
ebcdic_rtt_toascii[i] = i;
@ -1251,6 +1251,16 @@ ebcdic_init(void)
i = 256;
while (i--) {
t = ebcdic_rtt_toascii[i];
/* ensure unique round-trip capable mapping */
if (mapcache[t]) {
write(2, "mksh: duplicate EBCDIC to ASCII mapping\n", 40);
exit(255);
}
/*
* since there are 256 input octets, this also ensures
* the other mapping direction is completely filled
*/
mapcache[t] = true;
/* fill the complete round-trip map */
ebcdic_rtt_fromascii[t] = i;
/*
@ -1264,14 +1274,9 @@ ebcdic_init(void)
* an unsigned int, and or the raw unconverted EBCDIC
* values with 0x01000000 instead.
*/
if (t < 0x80U) {
if (mapcache[t]) {
write(2, "mksh: duplicate EBCDIC to ASCII mapping\n", 40);
exit(255);
}
mapcache[t] = true;
if (t < 0x80U)
ebcdic_map[i] = (unsigned short)ord(t);
} else
else
ebcdic_map[i] = (unsigned short)(0x100U | ord(i));
}
if (ebcdic_rtt_toascii[0] || ebcdic_rtt_fromascii[0] || ebcdic_map[0]) {