--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/highlight/languages/c.js	Tue Jan 13 19:18:47 2026 -0800
@@ -0,0 +1,343 @@
+/*! `c` grammar compiled for Highlight.js 11.11.1 */
+  (function(){
+    var hljsGrammar = (function () {
+  'use strict';
+
+  /*
+  Language: C
+  Category: common, system
+  Website: https://en.wikipedia.org/wiki/C_(programming_language)
+  */
+
+  /** @type LanguageFn */
+  function c(hljs) {
+    const regex = hljs.regex;
+    // added for historic reasons because `hljs.C_LINE_COMMENT_MODE` does
+    // not include such support nor can we be sure all the grammars depending
+    // on it would desire this behavior
+    const C_LINE_COMMENT_MODE = hljs.COMMENT('//', '$', { contains: [ { begin: /\\\n/ } ] });
+    const DECLTYPE_AUTO_RE = 'decltype\\(auto\\)';
+    const NAMESPACE_RE = '[a-zA-Z_]\\w*::';
+    const TEMPLATE_ARGUMENT_RE = '<[^<>]+>';
+    const FUNCTION_TYPE_RE = '('
+      + DECLTYPE_AUTO_RE + '|'
+      + regex.optional(NAMESPACE_RE)
+      + '[a-zA-Z_]\\w*' + regex.optional(TEMPLATE_ARGUMENT_RE)
+    + ')';
+
+
+    const TYPES = {
+      className: 'type',
+      variants: [
+        { begin: '\\b[a-z\\d_]*_t\\b' },
+        { match: /\batomic_[a-z]{3,6}\b/ }
+      ]
+
+    };
+
+    // https://en.cppreference.com/w/cpp/language/escape
+    // \\ \x \xFF \u2837 \u00323747 \374
+    const CHARACTER_ESCAPES = '\\\\(x[0-9A-Fa-f]{2}|u[0-9A-Fa-f]{4,8}|[0-7]{3}|\\S)';
+    const STRINGS = {
+      className: 'string',
+      variants: [
+        {
+          begin: '(u8?|U|L)?"',
+          end: '"',
+          illegal: '\\n',
+          contains: [ hljs.BACKSLASH_ESCAPE ]
+        },
+        {
+          begin: '(u8?|U|L)?\'(' + CHARACTER_ESCAPES + "|.)",
+          end: '\'',
+          illegal: '.'
+        },
+        hljs.END_SAME_AS_BEGIN({
+          begin: /(?:u8?|U|L)?R"([^()\\ ]{0,16})\(/,
+          end: /\)([^()\\ ]{0,16})"/
+        })
+      ]
+    };
+
+    const NUMBERS = {
+      className: 'number',
+      variants: [
+        { match: /\b(0b[01']+)/ },  
+        { match: /(-?)\b([\d']+(\.[\d']*)?|\.[\d']+)((ll|LL|l|L)(u|U)?|(u|U)(ll|LL|l|L)?|f|F|b|B)/ },  
+        { match: /(-?)\b(0[xX][a-fA-F0-9]+(?:'[a-fA-F0-9]+)*(?:\.[a-fA-F0-9]*(?:'[a-fA-F0-9]*)*)?(?:[pP][-+]?[0-9]+)?(l|L)?(u|U)?)/ },  
+        { match: /(-?)\b\d+(?:'\d+)*(?:\.\d*(?:'\d*)*)?(?:[eE][-+]?\d+)?/ }  
+    ],
+      relevance: 0
+    };  
+    
+    const PREPROCESSOR = {
+      className: 'meta',
+      begin: /#\s*[a-z]+\b/,
+      end: /$/,
+      keywords: { keyword:
+          'if else elif endif define undef warning error line '
+          + 'pragma _Pragma ifdef ifndef elifdef elifndef include' },
+      contains: [
+        {
+          begin: /\\\n/,
+          relevance: 0
+        },
+        hljs.inherit(STRINGS, { className: 'string' }),
+        {
+          className: 'string',
+          begin: /<.*?>/
+        },
+        C_LINE_COMMENT_MODE,
+        hljs.C_BLOCK_COMMENT_MODE
+      ]
+    };
+
+    const TITLE_MODE = {
+      className: 'title',
+      begin: regex.optional(NAMESPACE_RE) + hljs.IDENT_RE,
+      relevance: 0
+    };
+
+    const FUNCTION_TITLE = regex.optional(NAMESPACE_RE) + hljs.IDENT_RE + '\\s*\\(';
+
+    const C_KEYWORDS = [
+      "asm",
+      "auto",
+      "break",
+      "case",
+      "continue",
+      "default",
+      "do",
+      "else",
+      "enum",
+      "extern",
+      "for",
+      "fortran",
+      "goto",
+      "if",
+      "inline",
+      "register",
+      "restrict",
+      "return",
+      "sizeof",
+      "typeof",
+      "typeof_unqual",
+      "struct",
+      "switch",
+      "typedef",
+      "union",
+      "volatile",
+      "while",
+      "_Alignas",
+      "_Alignof",
+      "_Atomic",
+      "_Generic",
+      "_Noreturn",
+      "_Static_assert",
+      "_Thread_local",
+      // aliases
+      "alignas",
+      "alignof",
+      "noreturn",
+      "static_assert",
+      "thread_local",
+      // not a C keyword but is, for all intents and purposes, treated exactly like one.
+      "_Pragma"
+    ];
+
+    const C_TYPES = [
+      "float",
+      "double",
+      "signed",
+      "unsigned",
+      "int",
+      "short",
+      "long",
+      "char",
+      "void",
+      "_Bool",
+      "_BitInt",
+      "_Complex",
+      "_Imaginary",
+      "_Decimal32",
+      "_Decimal64",
+      "_Decimal96",
+      "_Decimal128",
+      "_Decimal64x",
+      "_Decimal128x",
+      "_Float16",
+      "_Float32",
+      "_Float64",
+      "_Float128",
+      "_Float32x",
+      "_Float64x",
+      "_Float128x",
+      // modifiers
+      "const",
+      "static",
+      "constexpr",
+      // aliases
+      "complex",
+      "bool",
+      "imaginary"
+    ];
+
+    const KEYWORDS = {
+      keyword: C_KEYWORDS,
+      type: C_TYPES,
+      literal: 'true false NULL',
+      // TODO: apply hinting work similar to what was done in cpp.js
+      built_in: 'std string wstring cin cout cerr clog stdin stdout stderr stringstream istringstream ostringstream '
+        + 'auto_ptr deque list queue stack vector map set pair bitset multiset multimap unordered_set '
+        + 'unordered_map unordered_multiset unordered_multimap priority_queue make_pair array shared_ptr abort terminate abs acos '
+        + 'asin atan2 atan calloc ceil cosh cos exit exp fabs floor fmod fprintf fputs free frexp '
+        + 'fscanf future isalnum isalpha iscntrl isdigit isgraph islower isprint ispunct isspace isupper '
+        + 'isxdigit tolower toupper labs ldexp log10 log malloc realloc memchr memcmp memcpy memset modf pow '
+        + 'printf putchar puts scanf sinh sin snprintf sprintf sqrt sscanf strcat strchr strcmp '
+        + 'strcpy strcspn strlen strncat strncmp strncpy strpbrk strrchr strspn strstr tanh tan '
+        + 'vfprintf vprintf vsprintf endl initializer_list unique_ptr',
+    };
+
+    const EXPRESSION_CONTAINS = [
+      PREPROCESSOR,
+      TYPES,
+      C_LINE_COMMENT_MODE,
+      hljs.C_BLOCK_COMMENT_MODE,
+      NUMBERS,
+      STRINGS
+    ];
+
+    const EXPRESSION_CONTEXT = {
+      // This mode covers expression context where we can't expect a function
+      // definition and shouldn't highlight anything that looks like one:
+      // `return some()`, `else if()`, `(x*sum(1, 2))`
+      variants: [
+        {
+          begin: /=/,
+          end: /;/
+        },
+        {
+          begin: /\(/,
+          end: /\)/
+        },
+        {
+          beginKeywords: 'new throw return else',
+          end: /;/
+        }
+      ],
+      keywords: KEYWORDS,
+      contains: EXPRESSION_CONTAINS.concat([
+        {
+          begin: /\(/,
+          end: /\)/,
+          keywords: KEYWORDS,
+          contains: EXPRESSION_CONTAINS.concat([ 'self' ]),
+          relevance: 0
+        }
+      ]),
+      relevance: 0
+    };
+
+    const FUNCTION_DECLARATION = {
+      begin: '(' + FUNCTION_TYPE_RE + '[\\*&\\s]+)+' + FUNCTION_TITLE,
+      returnBegin: true,
+      end: /[{;=]/,
+      excludeEnd: true,
+      keywords: KEYWORDS,
+      illegal: /[^\w\s\*&:<>.]/,
+      contains: [
+        { // to prevent it from being confused as the function title
+          begin: DECLTYPE_AUTO_RE,
+          keywords: KEYWORDS,
+          relevance: 0
+        },
+        {
+          begin: FUNCTION_TITLE,
+          returnBegin: true,
+          contains: [ hljs.inherit(TITLE_MODE, { className: "title.function" }) ],
+          relevance: 0
+        },
+        // allow for multiple declarations, e.g.:
+        // extern void f(int), g(char);
+        {
+          relevance: 0,
+          match: /,/
+        },
+        {
+          className: 'params',
+          begin: /\(/,
+          end: /\)/,
+          keywords: KEYWORDS,
+          relevance: 0,
+          contains: [
+            C_LINE_COMMENT_MODE,
+            hljs.C_BLOCK_COMMENT_MODE,
+            STRINGS,
+            NUMBERS,
+            TYPES,
+            // Count matching parentheses.
+            {
+              begin: /\(/,
+              end: /\)/,
+              keywords: KEYWORDS,
+              relevance: 0,
+              contains: [
+                'self',
+                C_LINE_COMMENT_MODE,
+                hljs.C_BLOCK_COMMENT_MODE,
+                STRINGS,
+                NUMBERS,
+                TYPES
+              ]
+            }
+          ]
+        },
+        TYPES,
+        C_LINE_COMMENT_MODE,
+        hljs.C_BLOCK_COMMENT_MODE,
+        PREPROCESSOR
+      ]
+    };
+
+    return {
+      name: "C",
+      aliases: [ 'h' ],
+      keywords: KEYWORDS,
+      // Until differentiations are added between `c` and `cpp`, `c` will
+      // not be auto-detected to avoid auto-detect conflicts between C and C++
+      disableAutodetect: true,
+      illegal: '</',
+      contains: [].concat(
+        EXPRESSION_CONTEXT,
+        FUNCTION_DECLARATION,
+        EXPRESSION_CONTAINS,
+        [
+          PREPROCESSOR,
+          {
+            begin: hljs.IDENT_RE + '::',
+            keywords: KEYWORDS
+          },
+          {
+            className: 'class',
+            beginKeywords: 'enum class struct union',
+            end: /[{;:<>=]/,
+            contains: [
+              { beginKeywords: "final class struct" },
+              hljs.TITLE_MODE
+            ]
+          }
+        ]),
+      exports: {
+        preprocessor: PREPROCESSOR,
+        strings: STRINGS,
+        keywords: KEYWORDS
+      }
+    };
+  }
+
+  return c;
+
+})();
+
+    hljs.registerLanguage('c', hljsGrammar);
+  })();
\ No newline at end of file