parallax

1 files changed, 44 insertions, 0 deletions

diff --git a/utl/json2map/common.c b/utl/json2map/common.c
new file mode 100644
index 0000000..c401fc1
--- /dev/null
+++ b/utl/json2map/common.c
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "common.h"
+
+struct blob load_file(char const *const name) {
+	const size_t START_SIZE = 8192;
+	FILE *file = fopen(name, "rb");
+	if (file == NULL) {
+		return (struct blob) {.data = NULL};
+	}
+	char *data = malloc(START_SIZE);
+	size_t allocated = START_SIZE;
+	size_t used = 0;
+	while (1) {
+		size_t read = fread(data + used, 1, allocated - used, file);
+		if (read != allocated - used) {
+			used += read;
+			break;
+		}
+		used += read;
+		allocated *= 2;
+		void *const newdata = realloc(data, allocated);
+		if (newdata == NULL) {
+			goto realloc_error;
+		}
+		data = newdata;
+	}
+	if (used == 0) {
+		free(data);
+		fclose(file);
+		return (struct blob) {.data = NULL, .size = 0};
+	}
+	void *const newdata = realloc(data, used);
+	if (newdata == NULL) {
+		goto realloc_error;
+	}
+	fclose(file);
+	return (struct blob) {.data = newdata, .size = used};
+	
+	realloc_error:
+	free(data);
+	fclose(file);
+	return (struct blob) {.data = NULL};
+}