From 1320299fc0097eff92369c33814abc0bd57c7e03 Mon Sep 17 00:00:00 2001
From: Joshua Weinstein <jweinstein@splunk.com>
Date: Mon, 11 Jun 2018 01:06:42 -0700
Subject: [PATCH] finished repl

---
 Makefile            |  5 +++++
 include/IOUtil.h    | 13 ++++++++++++-
 src/flow/WindData.c |  4 ++--
 src/main/Main.c     |  9 +++++++--
 src/util/IOUtil.c   | 21 +++++++++++++++++++++
 5 files changed, 47 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index fb9e6b1..2daba88 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,11 @@ LD_FLAGS :=
 MEM_FLAGS := -DWindData_BUF_SIZE=$(WIND_MEM_BUF) -DWindData_LOAD_SIZE=$(WIND_MEM_LOAD) -DWindComp_BUF_SIZE=$(WIND_MEM_COMP)
 CC_FLAGS := -c -Wall -I$(INC_DIR) $(MEM_FLAGS)
 
+# Cleans old and rebuilds all object files
+build:
+	make clean
+	make all
+
 clean:
 	rm -rf bin
 	rm -rf lib
diff --git a/include/IOUtil.h b/include/IOUtil.h
index 8d2789f..ce8b9b5 100644
--- a/include/IOUtil.h
+++ b/include/IOUtil.h
@@ -4,13 +4,24 @@
 #include "WindData.h"
 #include "WindState.h"
 #include "WindComp.h"
+#include "WindRun.h"
+
+#define IOUtil_REPL_PROMPT "wind> "
+
+#ifndef IOUtil_REPL_SIZE
+#define IOUtil_REPL_SIZE 512
+#endif
 
 
 // Prints a byte-marked sequence of Wind Values from start to end.
 int IOUtil_print(const unsigned char* start, const unsigned char* end);
 
-
+// Prints debug info about the state and data of Wind.
+// Allows visualization of the buffers, error, state, command
 void IOUtil_debug(void);
 
+// Starts a read eval print loop.
+void IOUtil_repl(void);
+
 
 #endif
diff --git a/src/flow/WindData.c b/src/flow/WindData.c
index 3d78ad3..f64154d 100644
--- a/src/flow/WindData.c
+++ b/src/flow/WindData.c
@@ -104,7 +104,7 @@ void WindData_active_set(unsigned char* place)
 
 void WindData_active_write(void* data, size_t length)
 {
-        unsigned char* writer = WindData_ACTIVE_B ? WindData_B1 : WindData_B0_PTR;
+        unsigned char* writer = WindData_ACTIVE_B ? WindData_B1_PTR : WindData_B0_PTR;
         if(length > (WindData_ACTIVE_B ? WindData_B1_END : WindData_B0_END) - writer)
         {
                 fprintf(stderr, "%s\n", "Memory Error: Ran out of load buffer memory, exiting.");
@@ -191,7 +191,7 @@ void WindData_inactive_set(unsigned char* place)
 
 void WindData_inactive_write(void* data, size_t length)
 {
-        unsigned char* writer = !WindData_ACTIVE_B ? WindData_B1 : WindData_B0_PTR;
+        unsigned char* writer = !WindData_ACTIVE_B ? WindData_B1_PTR : WindData_B0_PTR;
         if(length > (!WindData_ACTIVE_B ? WindData_B1_END : WindData_B0_END) - writer)
         {
                 fprintf(stderr, "%s\n", "Memory Error: Ran out of load buffer memory, exiting.");
diff --git a/src/main/Main.c b/src/main/Main.c
index 681e761..21182ac 100644
--- a/src/main/Main.c
+++ b/src/main/Main.c
@@ -7,9 +7,14 @@
 
 
 int main(int argc, char const *argv[]) {
-        if(argc != 3)
+        if(argc == 1)
         {
-                fprintf(stderr, "Error, need exactly two command line arguments, got %d\n", argc - 1);
+                IOUtil_repl();
+                exit(0);
+        }
+        if(argc > 3)
+        {
+                fprintf(stderr, "Error, need two or no command line arguments, got %d\n", argc - 1);
                 exit(1);
         }
         else if(!strcmp(argv[1], "-c"))
diff --git a/src/util/IOUtil.c b/src/util/IOUtil.c
index 608209f..a1fb03d 100644
--- a/src/util/IOUtil.c
+++ b/src/util/IOUtil.c
@@ -93,3 +93,24 @@ void IOUtil_debug(void)
         printf("]\n");
         puts("________________________");
 }
+
+void IOUtil_repl(void)
+{
+        int running = 1;
+        char replBuf[IOUtil_REPL_SIZE];
+        while(running)
+        {
+                printf(IOUtil_REPL_PROMPT);
+                if(fgets(replBuf, IOUtil_REPL_SIZE, stdin) != NULL)
+                {
+                        if(replBuf[0] == 'e' && replBuf[1] == 'x' && replBuf[2] == 'i' && replBuf[3] == 't')
+                        {
+                                return;
+                        }
+                        else
+                        {
+                                WindRun_code(replBuf);
+                        }
+                }
+        }
+}