Initial commit

.envrc

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+use flake

.gitignore

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+# Nix
+result*
+
+# Misc
+.direnv

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(
+    json
+    LANGUAGES
+        C
+)
+
+set(CMAKE_C_STANDARD 23)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+set(CMAKE_C_EXTENSIONS OFF)
+
+add_executable(
+    ${PROJECT_NAME}
+    main.c
+    json.c
+)
+

README.md

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+# Json
+
+A simple json stringifying library written in C out of frustration.
+
+See `main.c` for a usage example.
+

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1743315132,
+        "narHash": "sha256-6hl6L/tRnwubHcA4pfUUtk542wn2Om+D4UnDhlDW9BE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "52faf482a3889b7619003c0daec593a1912fddc1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "C Template";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { 
+    nixpkgs
+    , flake-utils
+    , ...
+    }:
+    flake-utils.lib.eachDefaultSystem (system:
+    let
+      pkgs = nixpkgs.legacyPackages.${system};
+      pname = "hello-world"; #package name
+      version = "0.0.1";
+      src = ./.;
+      buildInputs = with pkgs; [
+      ];
+      nativeBuildInputs = with pkgs; [
+        cmake
+        ninja
+        pkg-config
+        clang-tools
+        ctags
+      ];
+    in
+    {
+      devShells.default = pkgs.mkShell.override { stdenv = pkgs.clangStdenv; } {
+        inherit buildInputs nativeBuildInputs;
+      };
+
+      packages.default = pkgs.stdenv.mkDerivation {
+        inherit buildInputs nativeBuildInputs pname version src;
+      };
+
+      formatter = pkgs.alejandra;
+    });
+}

json.c

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+#include "json.h"
+
+#include <assert.h>
+
+#define UNREACHABLE() assert(false)
+
+Json json_init(FILE* stream, Whitespace whitespace)
+{
+    return (Json){
+        .stream = stream,
+        .whitespace = whitespace,
+        .indent_level = 0,
+        .next_punctuation = BEGINNING,
+    };
+}
+
+void json_free(Json* json)
+{
+}
+
+void begin_value(Json* json);
+void end_value(Json* json);
+void push_indentation(Json* json);
+void pop_indentation(Json* json);
+void indent(Json* json);
+
+void json_begin_array(Json* json)
+{
+    begin_value(json);
+    putc('[', json->stream);
+    push_indentation(json);
+    json->next_punctuation = NONE;
+}
+
+void json_end_array(Json* json)
+{
+    pop_indentation(json);
+    switch (json->next_punctuation) {
+    case NONE:
+        break;
+    case COMMA:
+        indent(json);
+        break;
+    case BEGINNING:
+    case COLON:
+        UNREACHABLE();
+    }
+    putc(']', json->stream);
+    end_value(json);
+}
+
+void json_begin_object(Json* json)
+{
+    begin_value(json);
+    putc('{', json->stream);
+    push_indentation(json);
+    json->next_punctuation = NONE;
+}
+
+void json_end_object(Json* json)
+{
+    pop_indentation(json);
+    switch (json->next_punctuation) {
+    case NONE:
+        break;
+    case COMMA:
+        indent(json);
+        break;
+    case BEGINNING:
+    case COLON:
+        UNREACHABLE();
+    }
+    putc('}', json->stream);
+    end_value(json);
+}
+
+void json_add_object_field(Json* json, const char* key)
+{
+    begin_value(json);
+    fprintf(json->stream, "\"%s\"", key);
+    json->next_punctuation = COLON;
+}
+
+void json_add_string(Json* json, const char* value)
+{
+    begin_value(json);
+    fprintf(json->stream, "\"%s\"", value);
+    end_value(json);
+}
+
+void json_add_long(Json* json, long value)
+{
+    begin_value(json);
+    fprintf(json->stream, "%ld", value);
+    end_value(json);
+}
+
+void json_add_double(Json* json, double value)
+{
+    begin_value(json);
+    fprintf(json->stream, "%f", value);
+    end_value(json);
+}
+
+void json_add_bool(Json* json, bool value)
+{
+    begin_value(json);
+    const char* s;
+    if (value) {
+        s = "true";
+    } else {
+        s = "false";
+    }
+    fputs(s, json->stream);
+    end_value(json);
+}
+
+void json_add_null(Json* json)
+{
+    begin_value(json);
+    fputs("null", json->stream);
+    end_value(json);
+}
+
+void begin_value(Json* json)
+{
+    switch (json->next_punctuation) {
+    case BEGINNING:
+        break;
+    case NONE:
+        indent(json);
+        break;
+    case COMMA:
+        fputc(',', json->stream);
+        indent(json);
+        break;
+    case COLON:
+        putc(':', json->stream);
+        if (json->whitespace != MINIFIED) {
+            fputc(' ', json->stream);
+        }
+        break;
+    }
+}
+
+void end_value(Json* json)
+{
+    json->next_punctuation = COMMA;
+}
+
+void push_indentation(Json* json)
+{
+    json->indent_level += 1;
+}
+
+void pop_indentation(Json* json)
+{
+    json->indent_level -= 1;
+}
+
+void indent(Json* json)
+{
+    char indent_char = ' ';
+    int n;
+    switch (json->whitespace) {
+    case MINIFIED:
+        return;
+    case INDENT_1:
+        n = 1 * json->indent_level;
+        break;
+    case INDENT_2:
+        n = 2 * json->indent_level;
+        break;
+    case INDENT_3:
+        n = 3 * json->indent_level;
+        break;
+    case INDENT_4:
+        n = 4 * json->indent_level;
+        break;
+    case INDENT_8:
+        n = 8 * json->indent_level;
+        break;
+    case INDENT_TAB:
+        indent_char = '\t';
+        n = json->indent_level;
+        break;
+    }
+    putc('\n', json->stream);
+    for (int i = 0; i < n; i++) {
+        putc(indent_char, json->stream);
+    }
+}
+

json.h

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+#ifndef JSON_H
+#define JSON_H
+
+#include <stdio.h>
+
+typedef enum Whitespace {
+    MINIFIED,
+    INDENT_1,
+    INDENT_2,
+    INDENT_3,
+    INDENT_4,
+    INDENT_8,
+    INDENT_TAB,
+} Whitespace;
+
+typedef enum Punctuation {
+    BEGINNING,
+    NONE,
+    COMMA,
+    COLON,
+} Punctuation;
+
+typedef struct Json {
+    FILE* stream;
+    Whitespace whitespace;
+    int indent_level;
+    Punctuation next_punctuation;
+} Json;
+
+Json json_init(FILE* stream, Whitespace whitespace);
+void json_free(Json* json);
+
+void json_begin_array(Json* json);
+void json_end_array(Json* json);
+void json_begin_object(Json* json);
+void json_end_object(Json* json);
+void json_add_object_field(Json* json, const char* key);
+void json_add_string(Json* json, const char* value);
+void json_add_long(Json* json, long value);
+void json_add_double(Json* json, double value);
+void json_add_bool(Json* json, bool value);
+void json_add_null(Json* json);
+
+#endif // JSON_H
+

main.c

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+#include <stdio.h>
+
+#include "json.h"
+
+typedef struct Info {
+    int id;
+    const char* description;
+    bool enabled;
+} Info;
+
+#define INFO_LEN 2
+static const Info infos[INFO_LEN] = {
+    (Info){
+        .id = 0,
+        .description = "test",
+        .enabled = true,
+    },
+    (Info){
+        .id = 1,
+        .description = "Hello, World!",
+        .enabled = false,
+    },
+};
+
+int main()
+{
+    auto json = json_init(stdout, INDENT_2);
+
+    json_begin_array(&json);
+    for (int i = 0; i < INFO_LEN; i++) {
+        auto info = infos[i];
+
+        json_begin_object(&json);
+        {
+            json_add_object_field(&json, "id");
+            json_add_long(&json, info.id);
+
+            json_add_object_field(&json, "description");
+            json_add_string(&json, info.description);
+
+            json_add_object_field(&json, "enabled");
+            json_add_bool(&json, info.enabled);
+        }
+        json_end_object(&json);
+    }
+    json_end_array(&json);
+
+    json_free(&json);
+}
+