From 649e5d53238c5a7cbb672a048e9e58490c1f1015 Mon Sep 17 00:00:00 2001
From: Srujun Thanmay Gupta <theununtrium@gmail.com>
Date: Thu, 24 Nov 2016 15:25:20 -0600
Subject: [PATCH] Fixed executable permissions and added sample program

This is to test how createfs and elfconvert work.
---
 createfs                    | Bin
 elfconvert                  | Bin
 syscalls/Makefile           |   2 +-
 syscalls/ece391factorial.c  |  44 ++++++++++++++++++++++++++++++++++++
 syscalls/to_fsdir/factorial | Bin 0 -> 5509 bytes
 5 files changed, 45 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 createfs
 mode change 100644 => 100755 elfconvert
 create mode 100644 syscalls/ece391factorial.c
 create mode 100755 syscalls/to_fsdir/factorial

diff --git a/createfs b/createfs
old mode 100644
new mode 100755
diff --git a/elfconvert b/elfconvert
old mode 100644
new mode 100755
diff --git a/syscalls/Makefile b/syscalls/Makefile
index e59b153..7bc758c 100644
--- a/syscalls/Makefile
+++ b/syscalls/Makefile
@@ -2,7 +2,7 @@ CFLAGS += -Wall -nostdlib -ffreestanding
 LDFLAGS += -nostdlib -ffreestanding
 CC = gcc
 
-ALL: cat grep hello ls pingpong counter shell sigtest testprint syserr
+ALL: cat grep hello ls pingpong counter shell sigtest testprint syserr factorial
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c -o $@ $<
diff --git a/syscalls/ece391factorial.c b/syscalls/ece391factorial.c
new file mode 100644
index 0000000..a4cadfe
--- /dev/null
+++ b/syscalls/ece391factorial.c
@@ -0,0 +1,44 @@
+#include <stdint.h>
+
+#include "ece391support.h"
+#include "ece391syscall.h"
+
+#define BUFSIZE 10
+
+int main ()
+{
+    uint8_t buf[BUFSIZE];
+    uint32_t cnt, i, num;
+
+    ece391_fdputs(1, (uint8_t*)"Enter number to calculate factorial of:\n");
+    if (-1 == (cnt = ece391_read(0, buf, BUFSIZE-1)) ) {
+        ece391_fdputs(1, (uint8_t*)"Can't read the number from keyboard.\n");
+     return 3;
+    }
+    buf[cnt] = '\0';
+
+    num = 0;
+    i = 0;
+    while (buf[i] >= '0' && buf[i] <= '9')
+    {
+        num *= 10;
+        num += (uint32_t)(buf[i] - '0');
+        i++;
+    }
+
+    cnt = 1;
+    while (num != 0)
+    {
+        cnt *= num;
+        num--;
+    }
+
+    uint8_t out[BUFSIZE];
+    ece391_itoa(cnt, out, 10);
+
+    ece391_fdputs(1, (uint8_t*)"Factorial: ");
+    ece391_fdputs(1, out);
+    ece391_fdputs(1, (uint8_t*)"\n");
+
+    return 0;
+}
diff --git a/syscalls/to_fsdir/factorial b/syscalls/to_fsdir/factorial
new file mode 100755
index 0000000000000000000000000000000000000000..3fff04cde64de2be694e025dbec65bd6aa4d0e42
GIT binary patch
literal 5509
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literal 0
HcmV?d00001