Merge branch 'main' of https://github.com/fastfloat/fast_float

.github/workflows/alpine.yml

@@ -18,7 +18,7 @@ jobs:
           - riscv64
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install latest Alpine Linux for ${{ matrix.arch }}
         uses: jirutka/setup-alpine@v1

.github/workflows/amalgamate-ubuntu24.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Compile with amalgamation
         run: |
           mkdir build &&

.github/workflows/cifuzz.yml

@@ -20,7 +20,7 @@ jobs:
        fuzz-seconds: 300
        output-sarif: true
    - name: Upload Crash
-     uses: actions/upload-artifact@v5
+     uses: actions/upload-artifact@v6
      if: failure() && steps.build.outcome == 'success'
      with:
        name: artifacts

.github/workflows/emscripten.yml

@@ -4,13 +4,13 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v4.2.2
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v4.2.2
-      - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6.0.0
+      - uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6.1.0
       - uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021 # v14
       - name: Verify
         run: emcc -v
       - name: Checkout
-        uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v3.6.0
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v3.6.0
       - name: Configure
         run: emcmake cmake -B build
       - name: Build # We build but do not test

.github/workflows/lint_and_format_check.yml

@@ -24,10 +24,10 @@ jobs:
   lint-and-format:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # v4.1.7
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v4.1.7
 
       - name: Run clang-format
-        uses: jidicula/clang-format-action@4726374d1aa3c6aecf132e5197e498979588ebc8 # v4.15.0
+        uses: jidicula/clang-format-action@6cd220de46c89139a0365edae93eee8eb30ca8fe # v4.16.0
         with:
           clang-format-version: '17'
 

.github/workflows/msys2-clang.yml

@@ -23,7 +23,7 @@ jobs:
       CMAKE_GENERATOR: Ninja
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: msys2/setup-msys2@v2
         with:
           update: true

.github/workflows/msys2.yml

@@ -29,7 +29,7 @@ jobs:
       CMAKE_GENERATOR: Ninja
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: msys2/setup-msys2@v2
         with:
           update: true

.github/workflows/on-release.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       
       - name: Amalgamate fast_float.h
         run: |

.github/workflows/risc.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Install packages
       run: |
         sudo apt-get update -q -y

.github/workflows/s390x.yml

@@ -12,7 +12,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: uraimo/run-on-arch-action@v3
         name: Test
         id: runcmd

.github/workflows/ubuntu22-clang.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Install clang++-14
         run: sudo apt-get install -y clang++-14
       - name: Use cmake

.github/workflows/ubuntu22-gcc12.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use cmake
         run: |
           mkdir build &&

.github/workflows/ubuntu22-sanitize.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use cmake
         run: |
           mkdir build &&

.github/workflows/ubuntu22.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use cmake
         run: |
           mkdir build &&

.github/workflows/ubuntu24-cxx20.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use cmake
         run: |
           mkdir build &&

.github/workflows/ubuntu24.yml

@@ -6,7 +6,7 @@ jobs:
   ubuntu-build:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use cmake
         run: |
           set -xe

.github/workflows/vs17-arm-ci.yml

@@ -14,7 +14,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: ARM64, cfg: Debug}
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: configure
         run: |
           cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DCMAKE_CROSSCOMPILING=1 -DFASTFLOAT_TEST=ON

.github/workflows/vs17-ci.yml

@@ -16,7 +16,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: x64, cfg: Debug}
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: configure
         run: |
           cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_BENCHMARKS=ON  -DFASTFLOAT_TEST=ON -DCMAKE_INSTALL_PREFIX:PATH=destination

.github/workflows/vs17-clang-ci.yml

@@ -16,7 +16,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: x64, cfg: Debug}
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Configure
         run: |
           cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}} -DFASTFLOAT_BENCHMARKS=ON -T ClangCL -DFASTFLOAT_TEST=ON

.github/workflows/vs17-cxx20.yml

@@ -16,7 +16,7 @@ jobs:
           - {gen: Visual Studio 17 2022, arch: x64, cfg: Debug}
     steps:
       - name: checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: configure
         run: >-
           cmake -S . -B build -G "${{matrix.gen}}" -A ${{matrix.arch}}

README.md

@@ -71,7 +71,7 @@ int main() {
 }
 ```
 
-Though the C++17 standard has you do a comparison with `std::errc()` to check whether the conversion worked, you can avoid it by casting the result to a `bool` like so:
+Prior to C++26, checking for a successful `std::from_chars` conversion requires comparing the `from_chars_result::ec` member to `std::errc()`. As an extension `fast_float::from_chars` supports the improved C++26 API that allows checking the result by converting it to `bool`, like so:
 
 ```cpp
 #include "fast_float/fast_float.h"
@@ -85,7 +85,7 @@ int main() {
     std::cout << "parsed the number " << result << std::endl;
     return EXIT_SUCCESS;
   }
-  std::cerr << "failed to parse " << result << std::endl;
+  std::cerr << "failed to parse " << input << std::endl;
   return EXIT_FAILURE;
 }
 ```

include/fast_float/float_common.h

@@ -2,6 +2,7 @@
 #define FASTFLOAT_FLOAT_COMMON_H
 
 #include <cfloat>
+#include <cstddef>
 #include <cstdint>
 #include <cassert>
 #include <cstring>
@@ -228,12 +229,16 @@ using parse_options = parse_options_t<char>;
 
 #ifndef FASTFLOAT_ASSERT
 #define FASTFLOAT_ASSERT(x)                                                    \
-  { ((void)(x)); }
+  {                                                                            \
+    ((void)(x));                                                               \
+  }
 #endif
 
 #ifndef FASTFLOAT_DEBUG_ASSERT
 #define FASTFLOAT_DEBUG_ASSERT(x)                                              \
-  { ((void)(x)); }
+  {                                                                            \
+    ((void)(x));                                                               \
+  }
 #endif
 
 // rust style `try!()` macro, or `?` operator
@@ -322,19 +327,151 @@ struct is_supported_char_type
 
 // TODO? use SSE4.2 there when SSE2 compiler switch in MSVC
 // or in other compiler SSE4.2 available?
+template <typename UC>
+inline FASTFLOAT_CONSTEXPR14 bool
+fastfloat_strncasecmp3(UC const *actual_mixedcase,
+                       UC const *expected_lowercase) {
+  uint64_t mask{0};
+  FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1) { mask = 0x2020202020202020; }
+  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 2) {
+    mask = 0x0020002000200020;
+  }
+  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
+    mask = 0x0000002000000020;
+  }
+  else {
+    return false;
+  }
+
+  uint64_t val1{0}, val2{0};
+  if (cpp20_and_in_constexpr()) {
+    for (size_t i = 0; i < 3; i++) {
+      if ((actual_mixedcase[i] | 32) != expected_lowercase[i]) {
+        return false;
+      }
+      return true;
+    }
+  } else {
+    FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1 || sizeof(UC) == 2) {
+      ::memcpy(&val1, actual_mixedcase, 3 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase, 3 * sizeof(UC));
+      val1 |= mask;
+      val2 |= mask;
+      return val1 == val2;
+    }
+    else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
+      ::memcpy(&val1, actual_mixedcase, 2 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase, 2 * sizeof(UC));
+      val1 |= mask;
+      if (val1 != val2) {
+        return false;
+      }
+      return (actual_mixedcase[2] | 32) == (expected_lowercase[2]);
+    }
+    else {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+template <typename UC>
+inline FASTFLOAT_CONSTEXPR14 bool
+fastfloat_strncasecmp5(UC const *actual_mixedcase,
+                       UC const *expected_lowercase) {
+  uint64_t mask{0};
+  uint64_t val1{0}, val2{0};
+  if (cpp20_and_in_constexpr()) {
+    for (size_t i = 0; i < 5; i++) {
+      if ((actual_mixedcase[i] | 32) != expected_lowercase[i]) {
+        return false;
+      }
+      return true;
+    }
+  } else {
+    FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1) {
+      mask = 0x2020202020202020;
+      ::memcpy(&val1, actual_mixedcase, 5 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase, 5 * sizeof(UC));
+      val1 |= mask;
+      val2 |= mask;
+      return val1 == val2;
+    }
+    else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 2) {
+      mask = 0x0020002000200020;
+      ::memcpy(&val1, actual_mixedcase, 4 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase, 4 * sizeof(UC));
+      val1 |= mask;
+      if (val1 != val2) {
+        return false;
+      }
+      return (actual_mixedcase[4] | 32) == (expected_lowercase[4]);
+    }
+    else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
+      mask = 0x0000002000000020;
+      ::memcpy(&val1, actual_mixedcase, 2 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase, 2 * sizeof(UC));
+      val1 |= mask;
+      if (val1 != val2) {
+        return false;
+      }
+      ::memcpy(&val1, actual_mixedcase + 2, 2 * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase + 2, 2 * sizeof(UC));
+      val1 |= mask;
+      if (val1 != val2) {
+        return false;
+      }
+      return (actual_mixedcase[4] | 32) == (expected_lowercase[4]);
+    }
+    else {
+      return false;
+    }
+  }
+
+  return true;
+}
 
 // Compares two ASCII strings in a case insensitive manner.
 template <typename UC>
 inline FASTFLOAT_CONSTEXPR14 bool
 fastfloat_strncasecmp(UC const *actual_mixedcase, UC const *expected_lowercase,
                       uint_fast8_t const length) noexcept {
-  for (uint_fast8_t i = 0; i != length; ++i) {
+  uint64_t mask{0};
-    UC const actual = actual_mixedcase[i];
+  FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 1) { mask = 0x2020202020202020; }
-    if ((actual < 256 ? actual | 32 : actual) != expected_lowercase[i]) {
+  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 2) {
-      return false;
+    mask = 0x0020002000200020;
-    }
+  }
+  else FASTFLOAT_IF_CONSTEXPR17(sizeof(UC) == 4) {
+    mask = 0x0000002000000020;
+  }
+  else {
+    return false;
+  }
+
+  if (cpp20_and_in_constexpr()) {
+    for (size_t i = 0; i < length; i++) {
+      if ((actual_mixedcase[i] | 32) != expected_lowercase[i]) {
+        return false;
+      }
+      return true;
+    }
+  } else {
+    uint64_t val1{0}, val2{0};
+    size_t sz{8 / (sizeof(UC))};
+    for (size_t i = 0; i < length; i += sz) {
+      val1 = val2 = 0;
+      sz = std::min(sz, length - i);
+      ::memcpy(&val1, actual_mixedcase + i, sz * sizeof(UC));
+      ::memcpy(&val2, expected_lowercase + i, sz * sizeof(UC));
+      val1 |= mask;
+      val2 |= mask;
+      if (val1 != val2) {
+        return false;
+      }
+    }
+    return true;
   }
-  return true;
 }
 #endif
 

include/fast_float/parse_number.h

@@ -39,7 +39,7 @@ from_chars_result_t<UC>
   }
 
   if (last - first >= 3) {
-    if (fastfloat_strncasecmp(first, str_const_nan<UC>(), 3)) {
+    if (fastfloat_strncasecmp3(first, str_const_nan<UC>())) {
       answer.ptr = (first += 3);
       value = minusSign ? -std::numeric_limits<T>::quiet_NaN()
                         : std::numeric_limits<T>::quiet_NaN();
@@ -58,9 +58,9 @@ from_chars_result_t<UC>
       }
       return answer;
     }
-    if (fastfloat_strncasecmp(first, str_const_inf<UC>(), 3)) {
+    if (fastfloat_strncasecmp3(first, str_const_inf<UC>())) {
       if ((last - first >= 8) &&
-          fastfloat_strncasecmp(first + 3, str_const_inf<UC>() + 3, 5)) {
+          fastfloat_strncasecmp5(first + 3, str_const_inf<UC>() + 3)) {
         answer.ptr = first + 8;
       } else {
         answer.ptr = first + 3;