1 files changed, 31 insertions, 0 deletions
diff --git a/rushs/tinyprintf/io_merge_files/merge_files.c b/rushs/tinyprintf/io_merge_files/merge_files.c
new file mode 100644
index 0000000..26ac9cf
--- /dev/null
+++ b/rushs/tinyprintf/io_merge_files/merge_files.c
@@ -0,0 +1,31 @@
+#define _POSIX_C_SOURCE 200809L
+
+#include <stdio.h>
+
+int merge_files(const char *file_1, const char *file_2)
+{
+    FILE *a = fopen(file_1, "a");
+    if (a == NULL)
+    {
+        return -1;
+    }
+    FILE *r = fopen(file_2, "r");
+    if (r == NULL)
+    {
+        return -1;
+    }
+
+    int c;
+    while ((c = fgetc(r)) != EOF)
+    {
+        if (fputc(c, a) == EOF)
+        {
+            return -1;
+        }
+    }
+
+    fclose(a);
+    fclose(r);
+
+    return 0;
+}