Initial release

.travis.yml

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+language: objective-c
+osx_image: xcode9.2
+env:
+  global:
+  - LC_CTYPE=en_US.UTF-8
+  - LANG=en_US.UTF-8
+  - PROJECT=libcmark_gfm.xcodeproj
+  - IOS_FRAMEWORK_SCHEME="libcmark_gfm-iOS"
+  - MACOS_FRAMEWORK_SCHEME="libcmark_gfm-macOS"
+  - TVOS_FRAMEWORK_SCHEME="libcmark_gfm-tvOS"
+  - WATCHOS_FRAMEWORK_SCHEME="libcmark_gfm-watchOS"
+  - IOS_SDK=iphonesimulator11.2
+  - MACOS_SDK=macosx10.13
+  - TVOS_SDK=appletvsimulator11.2
+  - WATCHOS_SDK=watchsimulator4.2
+  matrix:
+    - DESTINATION="OS=4.2,name=Apple Watch Series 3 - 42mm" SCHEME="$WATCHOS_FRAMEWORK_SCHEME" SDK="$WATCHOS_SDK" RUN_TESTS="NO"  POD_LINT="NO"
+
+    - DESTINATION="OS=11.2,name=Apple TV 4K"                SCHEME="$TVOS_FRAMEWORK_SCHEME"    SDK="$TVOS_SDK"    RUN_TESTS="YES" POD_LINT="NO"
+
+    - DESTINATION="arch=x86_64"                             SCHEME="$MACOS_FRAMEWORK_SCHEME"   SDK="$MACOS_SDK"   RUN_TESTS="YES" POD_LINT="NO"
+
+    - DESTINATION="OS=11.2,name=iPhone X"                   SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="YES" POD_LINT="YES"
+
+before_install:
+  - gem install cocoapods --pre --no-rdoc --no-ri --no-document --quiet
+script:
+  - pod install
+  - set -o pipefail
+  - xcodebuild -version
+  - xcodebuild -showsdks
+
+  # Build Framework in Debug and Run Tests if specified
+  - if [ $RUN_TESTS == "YES" ]; then
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO ENABLE_TESTABILITY=YES test | xcpretty;
+    else
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Debug ONLY_ACTIVE_ARCH=NO build | xcpretty;
+    fi
+
+  # Build Framework in Release and Run Tests if specified
+  - if [ $RUN_TESTS == "YES" ]; then
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO ENABLE_TESTABILITY=YES test | xcpretty;
+    else
+      xcodebuild -project "$PROJECT" -scheme "$SCHEME" -sdk "$SDK" -destination "$DESTINATION" -configuration Release ONLY_ACTIVE_ARCH=NO build | xcpretty;
+    fi
+
+  # Run `pod lib lint` if specified
+  - if [ $POD_LINT == "YES" ]; then
+      pod lib lint;
+    fi

Package.swift

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+// swift-tools-version:4.0
+
+import PackageDescription
+
+let package = Package(
+    name: "libcmark_gfm",
+    products: [
+        .library(
+            name: "libcmark_gfm",
+            targets: ["libcmark_gfm"]),
+    ],
+    targets: [
+        .target(
+            name: "libcmark_gfm",
+            dependencies: [])
+    ]
+)

README.md

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+# libcmark_gfm
+
+Swift compatible framework for cmark-gfm. Works with CocoaPods, Carthage, and the Swift Package Manager.
+
+[![](https://travis-ci.org/KristopherGBaker/libcmark_gfm.svg?branch=master)](https://travis-ci.org/KristopherGBaker/libcmark_gfm)

Sources/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>Copyright © 2017 Kristopher Baker. All rights reserved.</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

Sources/libcmark_gfm/arena.c

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+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include "cmark.h"
+#include "cmark_extension_api.h"
+
+static struct arena_chunk {
+  size_t sz, used;
+  uint8_t push_point;
+  void *ptr;
+  struct arena_chunk *prev;
+} *A = NULL;
+
+static struct arena_chunk *alloc_arena_chunk(size_t sz, struct arena_chunk *prev) {
+  struct arena_chunk *c = (struct arena_chunk *)calloc(1, sizeof(*c));
+  if (!c)
+    abort();
+  c->sz = sz;
+  c->ptr = calloc(1, sz);
+  if (!c->ptr)
+    abort();
+  c->prev = prev;
+  return c;
+}
+
+void cmark_arena_push(void) {
+  if (!A)
+    return;
+  A->push_point = 1;
+  A = alloc_arena_chunk(10240, A);
+}
+
+int cmark_arena_pop(void) {
+  if (!A)
+    return 0;
+  while (A && !A->push_point) {
+    free(A->ptr);
+    struct arena_chunk *n = A->prev;
+    free(A);
+    A = n;
+  }
+  if (A)
+    A->push_point = 0;
+  return 1;
+}
+
+static void init_arena(void) {
+  A = alloc_arena_chunk(4 * 1048576, NULL);
+}
+
+void cmark_arena_reset(void) {
+  while (A) {
+    free(A->ptr);
+    struct arena_chunk *n = A->prev;
+    free(A);
+    A = n;
+  }
+}
+
+static void *arena_calloc(size_t nmem, size_t size) {
+  if (!A)
+    init_arena();
+
+  size_t sz = nmem * size + sizeof(size_t);
+
+  // Round allocation sizes to largest integer size to
+  // ensure returned memory is correctly aligned
+  const size_t align = sizeof(size_t) - 1;
+  sz = (sz + align) & ~align;
+
+  if (sz > A->sz) {
+    A->prev = alloc_arena_chunk(sz, A->prev);
+    return (uint8_t *) A->prev->ptr + sizeof(size_t);
+  }
+  if (sz > A->sz - A->used) {
+    A = alloc_arena_chunk(A->sz + A->sz / 2, A);
+  }
+  void *ptr = (uint8_t *) A->ptr + A->used;
+  A->used += sz;
+  *((size_t *) ptr) = sz - sizeof(size_t);
+  return (uint8_t *) ptr + sizeof(size_t);
+}
+
+static void *arena_realloc(void *ptr, size_t size) {
+  if (!A)
+    init_arena();
+
+  void *new_ptr = arena_calloc(1, size);
+  if (ptr)
+    memcpy(new_ptr, ptr, ((size_t *) ptr)[-1]);
+  return new_ptr;
+}
+
+static void arena_free(void *ptr) {
+  (void) ptr;
+  /* no-op */
+}
+
+cmark_mem CMARK_ARENA_MEM_ALLOCATOR = {arena_calloc, arena_realloc, arena_free};
+
+cmark_mem *cmark_get_arena_mem_allocator() {
+  return &CMARK_ARENA_MEM_ALLOCATOR;
+}