second attempt

testline.c

@@ -16,26 +16,27 @@ typedef struct InfoState {
 void lcd_blank_line() {
   for (int i = 0; i < 15; ++i) {
     //lcd.print(' ');
-    printf(" ");
+    putchar(' ');
   }
 }
 
-int lcd_print_between(char* pos1, char* pos2) {
+int lcd_print_between(char* str, int pos1, int pos2) {
   //int i = 0;
   int va = 0;
   
-  char* p = pos1;
+  char* p = str+pos1;
   //int slen = strlen(str);
-  while (p < pos2) {
+  while (p < str+pos2) {
     if (*p != '\n' && *p != '\r') {
       //lcd.print(*(p++));
-      putchar(*(p++));
+      putchar(*p);
       ++va;
     } //else 
     //if (i == 0){ ++i; } else 
     //{
     //  break;
     //}
+    ++p;
   }
   
   if (va < 15) {
@@ -44,6 +45,7 @@ int lcd_print_between(char* pos1, char* pos2) {
       putchar(' ');
     }
   }
+  putchar('!');
   return va;
 }
 
@@ -76,6 +78,9 @@ list_t* aux_gen_wrap_list(list_t* wrap, char* text) {
     }
     ++curr;
   }
+  if (list_rpush(wrap, list_node_new((int)(curr-text))) == NULL) {
+    return NULL;
+  }
   return wrap;
 }
 
@@ -95,20 +100,38 @@ void initInfoState(InfoState* st, char* text) {
   st->pos2 = st->pos3 = NULL;
 }
 
-void initInfoScreen(InfoState* st, char* text) {
+int initInfoScreen(InfoState* st, char* text) {
   initInfoState(st, text);
+  printf("%d\n", st->wrap->len);
+  int retn = 0;
   //lcd.setCursor(0, 0);
   if ((st->pos2 = list_iterator_next(st->it))) {
     //printf("hello\n");
-    printf("%d\n", st->pos2->val);
-    int tmp = lcd_print_between(st->info, st->info+(int)st->pos2->val);
-    printf("%d\n", tmp);
+    //printf("%d\n", st->pos2->val);
+    int tmp = lcd_print_between(st->info, 0, (int)st->pos2->val);
+    //printf("%d\n", tmp);
+    //printf("%d\n", st->wrap->len);
+    if ((st->pos3 = list_iterator_next(st->it))) {
+      printf("\n");
+      //printf("%d\n", st->pos2->val);
+      //printf("%d\n", st->pos3->val);
+      int tmp = lcd_print_between(st->info, (int)st->pos2->val, (int)st->pos3->val);
+      //printf("%d\n", tmp);
+      //printf("%d\n", st->wrap->len);
+    } else {
+      printf("\n");
+      lcd_blank_line();
+    }
+  } else {
+    retn = 1;
+  }
+  return retn;
 }
 
+int scrollDown(InfoState* st) {
+  
 }
 
-
-
 /*
   Separate a substring that can be printed on one line, and return the 
   original string position corresponding to the end of the substring.
@@ -177,6 +200,8 @@ char* aux_sub_line_rev(char* str, char substr[16]) {
 int main() {
   char* cinfo = "Far far away, a\n\nbehind the word mountains, far from the countries Vokalia and Consonantia, there live the blind texts.";
   //             0              1516               32
+  char* s2 = "      ba\n      ab";
+  //          0          11
   list_t *wrap = list_new();
   wrap = aux_gen_wrap_list(wrap, cinfo);