sourcemeta · jviotti · Oct 28, 2025 · Oct 28, 2025
diff --git a/README.markdown b/README.markdown
@@ -66,6 +66,7 @@ expressed as JSON Schema definitions.
 | ISO | [ISO 8601-1:2019](https://www.iso.org/standard/70907.html) | Date and time — Representations for information interchange — Part 1: Basic rules |
 | ISO | [ISO 80000-1:2022](https://www.iso.org/standard/76921.html) | Quantities and units — Part 1: General |
 | ISO/IEC | [ISO/IEC 2382:2015](https://www.iso.org/standard/63598.html) | Information technology — Vocabulary |
+| ISO/IEC | [ISO/IEC 9899:2024](https://www.iso.org/standard/82075.html) | Programming languages — C |
 | JSON-RPC | [JSON-RPC 2.0](https://www.jsonrpc.org/specification) | JSON-RPC 2.0 Specification |
 | JSON Schema | [Draft 2020-12](https://json-schema.org/draft/2020-12/json-schema-core) | JSON Schema: A Media Type for Describing JSON Documents |
 

diff --git a/schemas/iso/c/2024/bool.json b/schemas/iso/c/2024/bool.json
@@ -0,0 +1,10 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Boolean Type (bool)",
+  "description": "A boolean type that can hold the values 0 (false) or 1 (true)",
+  "$comment": "In C, bool is represented as an integer type that can only hold 0 or 1. Defined in `<stdbool.h>` as `_Bool`",
+  "examples": [ 0, 1 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "enum": [ 0, 1 ]
+}
diff --git a/schemas/iso/c/2024/double.json b/schemas/iso/c/2024/double.json
@@ -0,0 +1,29 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Double Precision Floating Point (double)",
+  "description": "A double precision (64-bit) floating point type conforming to IEC 60559 (IEEE 754)",
+  "$comment": "The minimum and maximum represent `DBL_MAX` and `-DBL_MAX`. Special floating-point values are defined in a separate schema",
+  "examples": [
+    0.0,
+    1.5,
+    -3.14159,
+    299800000.0,
+    179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0,
+    -179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0,
+    "NAN",
+    "INFINITY",
+    "-INFINITY"
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "anyOf": [
+    {
+      "type": "number",
+      "maximum": 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0,
+      "minimum": -179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0
+    },
+    {
+      "$ref": "./float-special.json"
+    }
+  ]
+}
diff --git a/schemas/iso/c/2024/float-special.json b/schemas/iso/c/2024/float-special.json
@@ -0,0 +1,9 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Special Floating-Point Values",
+  "description": "Special floating-point values as defined in `<math.h>`. These are represented as strings since JSON numbers cannot express these values",
+  "examples": [ "NAN", "INFINITY", "-INFINITY" ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "enum": [ "NAN", "INFINITY", "-INFINITY" ]
+}
diff --git a/schemas/iso/c/2024/float.json b/schemas/iso/c/2024/float.json
@@ -0,0 +1,28 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Single Precision Floating Point (float)",
+  "description": "A single precision (32-bit) floating point type conforming to IEC 60559 (IEEE 754)",
+  "$comment": "The minimum and maximum represent `FLT_MAX` and `-FLT_MAX`. Special floating-point values are defined in a separate schema",
+  "examples": [
+    0.0,
+    1.5,
+    -3.14,
+    340282346600000016151267322115014000640.0,
+    -340282346600000016151267322115014000640.0,
+    "NAN",
+    "INFINITY",
+    "-INFINITY"
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "anyOf": [
+    {
+      "type": "number",
+      "maximum": 340282346600000016151267322115014000640.0,
+      "minimum": -340282346600000016151267322115014000640.0
+    },
+    {
+      "$ref": "./float-special.json"
+    }
+  ]
+}
diff --git a/schemas/iso/c/2024/int16_t.json b/schemas/iso/c/2024/int16_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Signed 16-bit Integer (int16_t)",
+  "description": "A signed integer type with width of exactly 16 bits",
+  "examples": [ 0, 1, -1, 32767, -32768, 1000, -1000 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 32767,
+  "minimum": -32768
+}
diff --git a/schemas/iso/c/2024/int32_t.json b/schemas/iso/c/2024/int32_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Signed 32-bit Integer (int32_t)",
+  "description": "A signed integer type with width of exactly 32 bits",
+  "examples": [ 0, 1, -1, 2147483647, -2147483648, 42, -999 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 2147483647,
+  "minimum": -2147483648
+}
diff --git a/schemas/iso/c/2024/int64_t.json b/schemas/iso/c/2024/int64_t.json
@@ -0,0 +1,19 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Signed 64-bit Integer (int64_t)",
+  "description": "A signed integer type with width of exactly 64 bits",
+  "examples": [
+    0,
+    1,
+    -1,
+    9223372036854775807,
+    -9223372036854775808,
+    1000000000,
+    -1000000000
+  ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 9223372036854775807,
+  "minimum": -9223372036854775808
+}
diff --git a/schemas/iso/c/2024/int8_t.json b/schemas/iso/c/2024/int8_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Signed 8-bit Integer (int8_t)",
+  "description": "A signed integer type with width of exactly 8 bits",
+  "examples": [ 0, 1, -1, 127, -128, 42, -99 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 127,
+  "minimum": -128
+}
diff --git a/schemas/iso/c/2024/uint16_t.json b/schemas/iso/c/2024/uint16_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Unsigned 16-bit Integer (uint16_t)",
+  "description": "An unsigned integer type with width of exactly 16 bits",
+  "examples": [ 0, 1, 65535, 32768, 1000 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 65535,
+  "minimum": 0
+}
diff --git a/schemas/iso/c/2024/uint32_t.json b/schemas/iso/c/2024/uint32_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Unsigned 32-bit Integer (uint32_t)",
+  "description": "An unsigned integer type with width of exactly 32 bits",
+  "examples": [ 0, 1, 4294967295, 2147483648, 42 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 4294967295,
+  "minimum": 0
+}
diff --git a/schemas/iso/c/2024/uint8_t.json b/schemas/iso/c/2024/uint8_t.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "title": "ISO/IEC 9899:2024 Unsigned 8-bit Integer (uint8_t)",
+  "description": "An unsigned integer type with width of exactly 8 bits",
+  "examples": [ 0, 1, 255, 128, 42 ],
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "x-links": [ "https://www.iso.org/standard/82075.html" ],
+  "type": "integer",
+  "maximum": 255,
+  "minimum": 0
+}
diff --git a/test/iso/c/2024/bool.test.json b/test/iso/c/2024/bool.test.json
@@ -0,0 +1,61 @@
+{
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "target": "../../../../schemas/iso/c/2024/bool.json",
+  "tests": [
+    {
+      "description": "Valid - 0 (false)",
+      "data": 0,
+      "valid": true
+    },
+    {
+      "description": "Valid - 1 (true)",
+      "data": 1,
+      "valid": true
+    },
+    {
+      "description": "Invalid - 2",
+      "data": 2,
+      "valid": false
+    },
+    {
+      "description": "Invalid - negative number",
+      "data": -1,
+      "valid": false
+    },
+    {
+      "description": "Invalid - large positive number",
+      "data": 100,
+      "valid": false
+    },
+    {
+      "description": "Invalid type - string",
+      "data": "true",
+      "valid": false
+    },
+    {
+      "description": "Invalid type - boolean",
+      "data": true,
+      "valid": false
+    },
+    {
+      "description": "Invalid type - null",
+      "data": null,
+      "valid": false
+    },
+    {
+      "description": "Invalid type - array",
+      "data": [],
+      "valid": false
+    },
+    {
+      "description": "Invalid type - object",
+      "data": {},
+      "valid": false
+    },
+    {
+      "description": "Invalid type - float",
+      "data": 0.5,
+      "valid": false
+    }
+  ]
+}
diff --git a/test/iso/c/2024/double.test.json b/test/iso/c/2024/double.test.json
@@ -0,0 +1,116 @@
+{
+  "x-license": "https://github.com/sourcemeta/std/blob/main/LICENSE",
+  "target": "../../../../schemas/iso/c/2024/double.json",
+  "tests": [
+    {
+      "description": "Valid - zero",
+      "data": 0.0,
+      "valid": true
+    },
+    {
+      "description": "Valid - positive value",
+      "data": 1.5,
+      "valid": true
+    },
+    {
+      "description": "Valid - negative value",
+      "data": -3.14159,
+      "valid": true
+    },
+    {
+      "description": "Valid - scientific notation",
+      "data": 299800000.0,
+      "valid": true
+    },
+    {
+      "description": "Valid - maximum value",
+      "data": 179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0,
+      "valid": true
+    },
+    {
+      "description": "Valid - minimum value",
+      "data": -179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.0,
+      "valid": true
+    },
+    {
+      "description": "Valid - special value NAN",
+      "data": "NAN",
+      "valid": true
+    },
+    {
+      "description": "Valid - special value INFINITY",
+      "data": "INFINITY",
+      "valid": true
+    },
+    {
+      "description": "Valid - special value -INFINITY",
+      "data": "-INFINITY",
+      "valid": true
+    },
+    {
+      "description": "Invalid - string with wrong case",
+      "data": "nan",
+      "valid": false
+    },
+    {
+      "description": "Invalid - string with wrong case",
+      "data": "infinity",
+      "valid": false
+    },
+    {
+      "description": "Invalid - JavaScript style",
+      "data": "Infinity",
+      "valid": false
+    },
+    {
+      "description": "Invalid - wrong special value string",
+      "data": "inf",
+      "valid": false
+    },
+    {
+      "description": "Invalid - numeric string",
+      "data": "1.5",
+      "valid": false
+    },
+    {
+      "description": "Invalid type - boolean",
+      "data": false,
+      "valid": false
+    },
+    {
+      "description": "Invalid type - null",
+      "data": null,
+      "valid": false
+    },
+    {
+      "description": "Invalid type - array",
+      "data": [],
+      "valid": false
+    },
+    {
+      "description": "Invalid type - object",
+      "data": {},
+      "valid": false
+    },
+    {
+      "description": "Valid - integer value",
+      "data": 42,
+      "valid": true
+    },
+    {
+      "description": "Valid - negative integer value",
+      "data": -100,
+      "valid": true
+    },
+    {
+      "description": "Valid - large value within range",
+      "data": 10000000000000000159028911097599180468360808563945281389781327557747838772170381060813469985856815104.0,
+      "valid": true
+    },
+    {
+      "description": "Valid - small negative value within range",
+      "data": -10000000000000000159028911097599180468360808563945281389781327557747838772170381060813469985856815104.0,
+      "valid": true
+    }
+  ]
+}