feat: IOB structures and iob_init()

src/io_backend/io_backend.c

@@ -0,0 +1,34 @@
+#include "io_backend.h"
+
+#include <stdio.h>
+
+static struct iob_context context;
+static FILE *input;
+
+int iob_init(struct iob_context *ctx)
+{
+    context = *ctx;
+
+    switch (context.mode)
+    {
+    IOB_MODE_STDIN:
+        input = stdin;
+        return 0;
+
+    IOB_MODE_SCRIPT:
+        if (context.args == NULL)
+            return -2;
+        input = fopen(context.args, "r");
+        if (input == NULL)
+            return -4;
+
+    IOB_MODE_CMD:
+        if (context.args != NULL)
+            return -2;
+        else
+            return 0;
+
+    default:
+        return -1;
+    }
+}

src/io_backend/io_backend.h

@@ -0,0 +1,46 @@
+#ifndef IO_BACKEND_H
+#define IO_BACKEND_H
+
+#include <sys/types.h>
+
+enum iob_mode {
+    IOB_MODE_NULL = 0,
+    IOB_MODE_STDIN,
+    IOB_MODE_SCRIPT,
+    IOB_MODE_CMD
+};
+
+/* @struct iob_context
+ * @var mode
+ * @var args contains
+ *        the script name when mode is set to IOB_SCRIPT,
+ *        the command to execute when mode is set to IOB_CMD,
+ */
+struct iob_context {
+    enum iob_mode mode;
+    char* args;
+};
+
+/*
+ * @brief Initializes the IO Backend module
+ * 
+ * @param context contains the input mode and the args
+ * @return 0 on success, the corresponding error code otherwise
+ */
+int iob_init(struct iob_context *context);
+
+/* TODO
+ *
+ *
+ *
+ */
+void iob_close();
+
+/*i TODO
+ *
+ *
+ *
+ */
+ssize_t stream_read(char** stream);
+
+#endif /* ! IO_BACKEND_H */