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bc/dc: fix length(0) and length(0.000nnn) result

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function                                             old     new   delta
zxc_vm_process                                      6464    6498     +34

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2021-02-26 14:05:28 +01:00
parent 3d88cc1d37
commit ace81cd46c
3 changed files with 23 additions and 4 deletions
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17
miscutils/bc.c
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@ -6259,13 +6259,20 @@ static unsigned long xc_program_len(BcNum *n)
{
size_t len = n->len;
if (n->rdx != len) return len;
if (n->rdx != len)
// length(100): rdx 0 len 3, return 3
// length(0.01-0.01): rdx 2 len 0, return 2
// dc: 0.01 0.01 - Zp: rdx 2 len 0, return 1
return len != 0 ? len : (IS_BC ? n->rdx : 1);
// length(0): return 1
// length(0.000nnn): count nnn
for (;;) {
if (len == 0) break;
len--;
if (n->num[len] != 0) break;
}
return len;
return len + 1;
}
static BC_STATUS zxc_program_builtin(char inst)
@ -6293,12 +6300,12 @@ static BC_STATUS zxc_program_builtin(char inst)
if (inst == XC_INST_SQRT)
s = zbc_num_sqrt(num, &res.d.n, G.prog.scale);
#if ENABLE_BC
else if (len != 0 && opnd->t == XC_RESULT_ARRAY) {
else if (len && opnd->t == XC_RESULT_ARRAY) {
bc_num_ulong2num(&res.d.n, (unsigned long) ((BcVec *) num)->len);
}
#endif
#if ENABLE_DC
else if (len != 0 && !BC_PROG_NUM(opnd, num)) {
else if (len && !BC_PROG_NUM(opnd, num)) {
char **str;
size_t idx = opnd->t == XC_RESULT_STR ? opnd->d.id.idx : num->rdx;
@ -6307,6 +6314,8 @@ static BC_STATUS zxc_program_builtin(char inst)
}
#endif
else {
//TODO: length(.00) and scale(.00) should return 2, they return 1 and 0 now
//(don't forget to check that dc Z and X commands do not break)
bc_num_ulong2num(&res.d.n, len ? xc_program_len(num) : xc_program_scale(num));
}