i can't believe i just wrote a json parser in C

src/main.c

@@ -0,0 +1,108 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include "parsers/json.h"
+
+typedef enum {
+    music = 0,
+    art = 1,
+    blog = 2,
+} MediaType;
+
+MediaType read_media_type(char *name) {
+    char *type_names[] = {"music", "art", "blog"};
+    for (int i = 0; i < sizeof(type_names) / sizeof(char*); i++) {
+        if (strcmp(name, type_names[i]) == 0) return i;
+    }
+    return -1;
+}
+
+void print_help() {
+    printf("usage: compile <-t media_type> <-i input_file> [output_file]\n");
+    printf("valid media types: music, art, blog\n");
+    printf("if output_file is not specified, the output will be written to stdout.\n");
+}
+
+int main(int argc, char **argv) {
+    if (argc <= 1) {
+        print_help();
+        return 0;
+    }
+
+    MediaType media_type = -1;
+    FILE *input_file = NULL;
+    size_t optind = 0;
+
+    for (optind = 1; optind < argc && argv[optind][0] == '-'; optind++) {
+        switch (argv[optind][1]) {
+            case 't':
+                media_type = read_media_type(argv[++optind]);
+                if (media_type < 0) {
+                    fprintf(stderr, "media type `%s` is not implemented!\n\n", argv[optind]);
+                    print_help();
+                    exit(EXIT_FAILURE);
+                }
+                break;
+            case 'i':
+                if (optind++ >= argc) {
+                    fprintf(stderr, "-i was passed, but no file path was given!\n\n");
+                    exit(EXIT_FAILURE);
+                }
+                input_file = fopen(argv[optind], "r");
+                if (input_file == NULL) {
+                    fprintf(stderr, "failed to open file %s!\n\n", argv[optind]);
+                    exit(EXIT_FAILURE);
+                }
+                break;
+            default:
+                print_help();
+                exit(EXIT_FAILURE);
+        }
+    }
+
+    if (media_type < 0) {
+        fprintf(stderr, "media type not provided!\n\n");
+        print_help();
+        exit(EXIT_FAILURE);
+    }
+    if (input_file == NULL) {
+        fprintf(stderr, "input file not provided!\n\n");
+        print_help();
+        exit(EXIT_FAILURE);
+    }
+
+    // get length of file
+    fseek(input_file, -sizeof(char), SEEK_END);
+    size_t length = ftell(input_file);
+    fseek(input_file, 0, SEEK_SET);
+
+    // read file to buffer
+    char buf[length + 1];
+    fread(buf, 1, length, input_file);
+    buf[length] = '\0';
+
+    size_t offset = 0;
+    JsonObject *json = json_parse(buf, &offset);
+    if (json == NULL) {
+        fprintf(stderr, "failed to parse input file!\n");
+        exit(EXIT_FAILURE);
+    }
+
+    printf("title: %s\n", (char*)json_get(json, "title"));
+    printf("type: %s\n", (char*)json_get(json, "type"));
+    printf("year: %.0f\n", *(float*)json_get(json, "year"));
+    printf("artwork: %s\n", (char*)json_get(json, "artwork"));
+    printf("buylink: %s\n", (char*)json_get(json, "buylink"));
+
+    JsonArrayItem *links = json_get(json, "links");
+    size_t i = 0;
+    while (links != NULL) {
+        JsonObject *link = links->value;
+        printf("links.%zu.title: %s\n", i, (char*)json_get(link, "title"));
+        printf("links.%zu.url: %s\n", i, (char*)json_get(link, "url"));
+        links = links->next;
+        i++;
+    }
+
+    return 0;
+}