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fill the map backwards (to use first occurrence of duplicates);

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add a cache to ensure basic ASCII mapping is bijective
This commit is contained in:
tg 2017-04-28 11:27:58 +00:00
parent 5743c00a5b
commit 7ff7821d6a
1 changed files with 17 additions and 8 deletions
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25
shf.c
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@ -25,7 +25,7 @@
#include "sh.h"
__RCSID("$MirOS: src/bin/mksh/shf.c,v 1.90 2017/04/28 11:13:49 tg Exp $");
__RCSID("$MirOS: src/bin/mksh/shf.c,v 1.91 2017/04/28 11:27:58 tg Exp $");
/* flags to shf_emptybuf() */
#define EB_READSW 0x01 /* about to switch to reading */
@ -1209,10 +1209,10 @@ const uint32_t tpl_ctypes[128] = {
void
set_ifs(const char *s)
{
ifs0 = *s;
memcpy(ksh_ctypes, tpl_ctypes, sizeof(tpl_ctypes));
memset((char *)ksh_ctypes + sizeof(tpl_ctypes), '\0',
sizeof(ksh_ctypes) - sizeof(tpl_ctypes));
ifs0 = *s;
while (*s)
ksh_ctypes[rtt2asc(*s++)] |= CiIFS;
}
@ -1225,9 +1225,11 @@ ebcdic_init(void)
{
int i = 256;
unsigned char t;
bool mapcache[128];
while (i--)
ebcdic_rtt_toascii[i] = i;
memset(ebcdic_rtt_fromascii, 0xFF, sizeof(ebcdic_rtt_fromascii));
setlocale(LC_ALL, "");
#ifdef MKSH_EBCDIC
if (__etoa_l(ebcdic_rtt_toascii, 256) != 256) {
@ -1236,10 +1238,12 @@ ebcdic_init(void)
}
#endif
i = 0;
do {
memset(mapcache, 0, sizeof(mapcache));
i = 256;
while (i--) {
t = ebcdic_rtt_toascii[i];
/* fill the complete round-trip map */
ebcdic_rtt_fromascii[ebcdic_rtt_toascii[i]] = i;
ebcdic_rtt_fromascii[t] = i;
/*
* Only use the converted value if it's in the range
* [0x00; 0x7F], which I checked; the "extended ASCII"
@ -1251,10 +1255,15 @@ ebcdic_init(void)
* an unsigned int, and or the raw unconverted EBCDIC
* values with 0x01000000 instead.
*/
if ((t = ebcdic_rtt_toascii[i]) < 0x80U)
if (t < 0x80U) {
if (mapcache[t]) {
write(2, "mksh: duplicate EBCDIC to ASCII mapping\n", 40);
exit(255);
}
mapcache[t] = true;
ebcdic_map[i] = (unsigned short)ord(t);
else
} else
ebcdic_map[i] = (unsigned short)(0x100U | ord(i));
} while (++i < 256);
}
}
#endif