sys/tsrb: ease readability

Author: kfessel

sys/tsrb/tsrb.c

@@ -59,14 +59,14 @@ int tsrb_peek_one(tsrb_t *rb)
 
 int tsrb_get(tsrb_t *rb, uint8_t *dst, size_t n)
 {
-    size_t tmp = n;
+    int cnt = 0;
     unsigned irq_state = irq_disable();
-    while (tmp && !tsrb_empty(rb)) {
+    while (n-- && !tsrb_empty(rb)) {
         *dst++ = _pop(rb);
-        tmp--;
+        cnt++;
     }
     irq_restore(irq_state);
-    return (n - tmp);
+    return (cnt);
 }
 
 int tsrb_peek(tsrb_t *rb, uint8_t *dst, size_t n)
@@ -78,19 +78,19 @@ int tsrb_peek(tsrb_t *rb, uint8_t *dst, size_t n)
         *dst++ = _peek(rb, idx++);
     }
     irq_restore(irq_state);
-    return idx;
+    return (int) idx;
 }
 
 int tsrb_drop(tsrb_t *rb, size_t n)
 {
-    size_t tmp = n;
+    int cnt = 0;
     unsigned irq_state = irq_disable();
-    while (tmp && !tsrb_empty(rb)) {
+    while (n-- && !tsrb_empty(rb)) {
         _pop(rb);
-        tmp--;
+        cnt++;
     }
     irq_restore(irq_state);
-    return (n - tmp);
+    return cnt;
 }
 
 int tsrb_add_one(tsrb_t *rb, uint8_t c)
@@ -107,12 +107,12 @@ int tsrb_add_one(tsrb_t *rb, uint8_t c)
 
 int tsrb_add(tsrb_t *rb, const uint8_t *src, size_t n)
 {
-    size_t tmp = n;
+    int cnt = 0;
     unsigned irq_state = irq_disable();
-    while (tmp && !tsrb_full(rb)) {
+    while (n-- && !tsrb_full(rb)) {
         _push(rb, *src++);
-        tmp--;
+        cnt++;
     }
     irq_restore(irq_state);
-    return (n - tmp);
+    return cnt;
 }