added add_file_infos function

include/sync/types.h

@@ -38,4 +38,14 @@ typedef enum {
     SYNC_RESULT,
 } SyncResultType;
 
+typedef struct {
+    SyncResultType type;
+    union {
+        FileInfo result;
+        GeneralError error;
+    };
+} FileInfoResult;
+
+FileInfoResult add_file_infos(FileInfo a, FileInfo b, const char* start);
+
 #endif // SYNC_TYPES_H

src/types.c

@@ -0,0 +1,38 @@
+// Kyler Olsen
+// ZINC Bootstrap compiler
+// Type helper functions
+// June 2025
+
+#include "sync/types.h"
+
+FileInfoResult add_file_infos(FileInfo a, FileInfo b, const char* start) {
+    if (a.filename != b.filename)
+        return (FileInfoResult){SYNC_ERROR, .error = (GeneralError){"Cannot add two FileInfo structs from different files.", 1}};
+    size_t line = a.line;
+    size_t column = a.column;
+    size_t length = a.length;
+    size_t lines = a.lines;
+    for (int i = a.length; ; i++) {
+        if (start[i] == '\0')
+            return (FileInfoResult){SYNC_ERROR, .error = (GeneralError){"Encountered end of string.", 1}};
+        if (start[i] == '\n') {
+            column = 1;
+            line++;
+            lines++;
+        } else column++;
+        length++;
+        if (line == b.line && column == b.column) {
+            length += b.length;
+            lines += b.lines;
+            break;
+        }
+    }
+    FileInfo file_info = {
+        .filename = a.filename,
+        .line = a.line,
+        .column = a.column,
+        .length = length,
+        .lines = lines
+    };
+    return (FileInfoResult){SYNC_RESULT, .result = file_info};
+}