now reads from stdin, cMIPS.{h,c}

cMIPS/include/cMIPS.h

 
 #define x_INST_BASE_ADDR 0x00000000
-#define x_DATA_BASE_ADDR 0x00020000
+#define x_DATA_BASE_ADDR 0x00010000
 #define x_IO_BASE_ADDR   0x0F000000
 #define x_IO_MEM_SZ      0x00002000
 #define x_IO_ADDR_RANGE  0x00000020
@@ -24,7 +24,7 @@
 extern void exit(int);
 extern void print(int);
 extern void to_stdout(char c);
-extern int  from_stdin(char *);
+extern int  from_stdin(void);
 
 extern void writeInt(int);
 extern void writeClose(void);

cMIPS/include/cMIPS.s

@@ -3,7 +3,7 @@
         .set x_INST_BASE_ADDR,0x00000000
         .set x_INST_MEM_SZ,0x00004000
 
-        .set x_DATA_BASE_ADDR,0x00020000
+        .set x_DATA_BASE_ADDR,0x00010000
         .set x_DATA_MEM_SZ,0x00008000
 	
         .set x_IO_BASE_ADDR,0x0F000000

cMIPS/include/cMIPSio.c

@@ -16,11 +16,12 @@
 //=======================================================================
 // simulator's STD_INPUT and STD_OUTPUT
 //=======================================================================
-// write an integer (hex) to VHDL simulator's standard output
-void print(int n) { 
-  int *IO = (int *)IO_PRINT_ADDR;
+// read a character from VHDL simulator's standard input
+int from_stdin(void) {
+  int *IO = (void *)IO_STDIN_ADDR;
   
-  *IO = n;
+  // gets line line only after receiving a '\n' (line-feed, 0x0a)
+  return( *IO );
 }
 
 // write a character to VHDL simulator's standard output
@@ -31,21 +32,12 @@ void to_stdout(char c) {
   *IO = (unsigned char)c;
 }
 
-// read a character from VHDL simulator's standard input
-//  return value = 1 if EnoOfFile, 0 otherwise  
-//  character read is stored at address provided in argument
-int from_stdin(char *c) {
-  int *IO = (int *)IO_STDIN_ADDR;
-  int status, value;
-
-  value  = *IO;
-  status = *(IO + 1);
+// write an integer (hex) to VHDL simulator's standard output
+void print(int n) { 
+  int *IO = (int *)IO_PRINT_ADDR;
 
-  if (status == 0) {
-    *c = (unsigned char)value;
+  *IO = n;
 }
-  return status;
-}; //--------------------------------------------------------------------
 
 
 //=======================================================================