Working on sourceviewer

bfckr.c

@@ -66,12 +66,46 @@ void die(const char *message)
 /* Prints the bf source at the current location */
 void print_sourceviewer(bf_code_t *bf)
 {
-    printf("\nSource viewer:                                           \n"
+    printf("\nSource viewer:\n");
+    printf("-------------------------------------------------------------\n"); // 62 dashes
+
+    if(bf->ip <= 30) { // if there aren't enough instruction characters to print
+        for(int i = bf->ip; i >= 0; i--) { // print as much instructions as possible
+            printf("%c", bf->code[i]);
+        }
+        for(int i = 30-(bf->ip); i >= 0; i--) { // then fill with whitespaces
+            printf(" ");
+        }
+    }
+
+    if(bf->ip > 30) { // if there are enough instruction characters
+        for(int i = 30; i >= 0; i--) { // print 30 instruction chars before ip
+            printf("%c", bf->code[i]);
+        }
+    }
+
+    // print 30 instructions begining at ip
+    for(size_t i = bf->ip; i < bf->ip + 29; i++) {
+        if(bf->code[i] == '\n') {
+            printf(" ");
+        } else if(bf->code[i] == NULL) {
+            printf(" ");
+        } else {
+            printf("%c", bf->code[i]);
+        }
+    }
+    printf("\n");
+    printf("                             ^                             \n");
+    printf("                             ip=%d                         \n", bf->ip);
+    printf("-------------------------------------------------------------\n");
+
+    /*printf("\nSource viewer:                                           \n"
            "-----------------------------------------------------------\n"
            "_____________________________>+++++++++++++++[<+>>>>>>>>+++\n"
            "                             ^                             \n"
            "                             ip=0                          \n"
            "-----------------------------------------------------------\n"); // just to get the idea ...
+    */
 }
 
 /* Prints memory information at the current memory location */
@@ -79,6 +113,8 @@ void print_memoryviewer(bf_code_t *bf)
 {
     // int pointerlocation = (p - memory)*sizeof(*memory); // find the arrayindex at which the pointer is pointing
 
+
+
     printf("\nMemory viewer:                                           \n"
            "-----------------------------------------------------------\n"
            "000 000 000 000 000 000 001 001 000 000 000 000 000 000 000\n"
@@ -91,7 +127,7 @@ void print_memoryviewer(bf_code_t *bf)
 /* Pauses the program flow and prints information */
 void bfuck_debugger(bf_code_t *bf) //char *bf_source_input, int instructionpointer)
 {
-    clear(); // clear terminal
+    //clear(); // clear terminal
 
     printf("[s]: single step [c]: continue\n");
 
@@ -154,7 +190,7 @@ void bfuck_execute(bf_code_t *bf)
                 // jump forward to the command after the next ]
                 loop = 1;
                 while(loop > 0) { // count nested loops and make sure to get the matching ]
-                    bf->ip = i++;
+                    bf->ip = i++; // save current instruction pointer and increment it
                     if(bf->code[i] == '[') {
                         loop++;
                     }
@@ -172,7 +208,7 @@ void bfuck_execute(bf_code_t *bf)
                 // jump back to the command after the matching [
                 loop = 1;
                 while(loop > 0) { // count nested loops and make sure to get the matching [
-                    bf->ip = i--;
+                    bf->ip = i--; // save current instruction pointer and increment it
                     if(bf->code[i] == '[') {
                         loop--;
                     }
@@ -226,6 +262,7 @@ int main(int argc, char* argv[])
     // close file after reading
     fclose(fp);
 
+    bfuck_debugger(&bf);
     // try to interpret it
     bfuck_execute(&bf);
 

examples/pi.bf

@@ -1,4 +1,4 @@
->  +++++ +++++ +++++ (15 digits)
+>  +++++ +++++ +++++
 
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