static value_t fl_truncate(value_t *args, u_int32_t nargs)
{
argcount("truncate", nargs, 1);
if (isfixnum(args[0]))
return args[0];
if (iscprim(args[0])) {
cprim_t *cp = (cprim_t*)ptr(args[0]);
void *data = cp_data(cp);
numerictype_t nt = cp_numtype(cp);
double d;
if (nt == T_FLOAT)
d = (double)*(float*)data;
else if (nt == T_DOUBLE)
d = *(double*)data;
else
return args[0];
if (d > 0) {
if (d > (double)U64_MAX)
return args[0];
return return_from_uint64((uint64_t)d);
}
if (d > (double)S64_MAX || d < (double)S64_MIN)
return args[0];
return return_from_int64((int64_t)d);
}
type_error("truncate", "number", args[0]);
}
int isnumtok_base(char *tok, value_t *pval, int base)
{
char *end;
int64_t i64;
uint64_t ui64;
double d;
if (*tok == '\0')
return 0;
if (!((tok[0]=='0' && tok[1]=='x') || (base >= 15)) &&
strpbrk(tok, ".eEpP")) {
d = strtod(tok, &end);
if (*end == '\0') {
if (pval) *pval = mk_double(d);
return 1;
}
// floats can end in f or f0
if (end > tok && end[0] == 'f' &&
(end[1] == '\0' ||
(end[1] == '0' && end[2] == '\0'))) {
if (pval) *pval = mk_float((float)d);
return 1;
}
}
if (tok[0] == '+') {
if (!strcmp(tok,"+NaN") || !strcasecmp(tok,"+nan.0")) {
if (pval) *pval = mk_double(D_PNAN);
return 1;
}
if (!strcmp(tok,"+Inf") || !strcasecmp(tok,"+inf.0")) {
if (pval) *pval = mk_double(D_PINF);
return 1;
}
}
else if (tok[0] == '-') {
if (!strcmp(tok,"-NaN") || !strcasecmp(tok,"-nan.0")) {
if (pval) *pval = mk_double(D_NNAN);
return 1;
}
if (!strcmp(tok,"-Inf") || !strcasecmp(tok,"-inf.0")) {
if (pval) *pval = mk_double(D_NINF);
return 1;
}
errno = 0;
i64 = strtoll(tok, &end, base);
if (errno)
return 0;
if (pval) *pval = return_from_int64(i64);
return (*end == '\0');
}
errno = 0;
ui64 = strtoull_0b0o(tok, &end, base);
if (errno)
return 0;
if (pval) *pval = return_from_uint64(ui64);
return (*end == '\0');
}
