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arith: Fix variables 'nan' and 'inf' in arithmetic for POSIX mode

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The --posix compliance option now disables the case-insensitive
special floating point constants Inf and NaN so that all case
variants of $((inf)) and $((nan)) refer to the variables by those
names as the standard requires. (BUG_ARITHNAN)

src/cmd/ksh93/sh/arith.c: arith():
- Only do case-insensitive checks for "Inf" and "NaN" if the POSIX
  option is off.
This commit is contained in:
Martijn Dekker 2021-11-15 18:49:19 +01:00
parent d9cd49c6d7
commit 56c2e13e92
5 changed files with 39 additions and 6 deletions
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4
src/cmd/ksh93/sh/arith.c
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@ -349,14 +349,14 @@ static Sfdouble_t arith(const char **ptr, struct lval *lvalue, int type, Sfdoubl
}
*str = 0;
cp = (char*)*ptr;
if ((cp[0] == 'i' || cp[0] == 'I') && (cp[1] == 'n' || cp[1] == 'N') && (cp[2] == 'f' || cp[2] == 'F') && cp[3] == 0)
if(!sh_isoption(SH_POSIX) && (cp[0] == 'i' || cp[0] == 'I') && (cp[1] == 'n' || cp[1] == 'N') && (cp[2] == 'f' || cp[2] == 'F') && cp[3] == 0)
{
Inf = strtold("Inf", NiL);
Infnod.nvalue.ldp = &Inf;
np = &Infnod;
nv_onattr(np,NV_NOFREE|NV_LDOUBLE|NV_RDONLY);
}
else if ((cp[0] == 'n' || cp[0] == 'N') && (cp[1] == 'a' || cp[1] == 'A') && (cp[2] == 'n' || cp[2] == 'N') && cp[3] == 0)
else if(!sh_isoption(SH_POSIX) && (cp[0] == 'n' || cp[0] == 'N') && (cp[1] == 'a' || cp[1] == 'A') && (cp[2] == 'n' || cp[2] == 'N') && cp[3] == 0)
{
NaN = strtold("NaN", NiL);
NaNnod.nvalue.ldp = &NaN;