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fromString: Parse hex float literals. (#408)

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This commit is contained in:
Branimir Karadžić
2026-07-21 23:43:24 -07:00
committed by GitHub
parent a7257985fa
commit 5a2b876258
2 changed files with 151 additions and 0 deletions
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35
tests/string_test.cpp
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@@ -4,6 +4,7 @@
*/
#include "test.h"
#include <bx/constants.h>
#include <bx/filepath.h>
#include <bx/string.h>
#include <bx/handlealloc.h>
@@ -479,6 +480,40 @@ TEST_CASE("fromString double", "[string]")
REQUIRE(testFromString<double>(std::numeric_limits<double>::max(), "1.7976931348623158e+308") );
}
TEST_CASE("fromString hex float", "[string]")
{
double d = 1.0;
REQUIRE(bx::fromString(&d, "0x1p+0") ); REQUIRE(d == 1.0);
REQUIRE(bx::fromString(&d, "0x1P0") ); REQUIRE(d == 1.0);
REQUIRE(bx::fromString(&d, "0x1.8p+1") ); REQUIRE(d == 3.0);
REQUIRE(bx::fromString(&d, "0x1p-1") ); REQUIRE(d == 0.5);
REQUIRE(bx::fromString(&d, "-0x1.4p+2")); REQUIRE(d == -5.0);
REQUIRE(bx::fromString(&d, "0x0.8p+1") ); REQUIRE(d == 1.0);
REQUIRE(bx::fromString(&d, "0x1.8") ); REQUIRE(d == 1.5);
REQUIRE(bx::fromString(&d, "0x10") ); REQUIRE(d == 16.0);
REQUIRE(bx::fromString(&d, "0x1.fffffep+127") );
REQUIRE(d == double(bx::kFloatLargest) );
REQUIRE(bx::fromString(&d, "0x1p-126") );
REQUIRE(d == double(bx::kFloatSmallest) );
REQUIRE(bx::fromString(&d, "0x1.fffffffffffffp+1023") );
REQUIRE(d == bx::kDoubleLargest);
REQUIRE(bx::fromString(&d, "0x1p-1022") );
REQUIRE(d == bx::kDoubleSmallest);
float f = 0.0f;
REQUIRE(bx::fromString(&f, "0x1.fffffep+127") );
REQUIRE(f == bx::kFloatLargest);
REQUIRE(bx::fromString(&f, "0x1p-126") );
REQUIRE(f == bx::kFloatSmallest);
}
static bool testFromString(int32_t _value, const char* _input)
{
char tmp[1024];