gistfile1.txt

diff --git a/qrintf.h b/qrintf.h
index 6e6c7d8..35af13e 100644
--- a/qrintf.h
+++ b/qrintf.h
@@ -73,26 +73,37 @@ static inline qrintf_t _qrintf_s_len(qrintf_t ctx, const char *s, size_t l)
     return ctx;
 }
 
+static inline void _qprintf_reverse(char *start, char *end)
+{
+    char *s = start;
+    char *e = end - 1;
+    char *middle = s + (end - s) / 2;
+    char tmp;
+    while (s < middle) {
+        tmp = *s;
+        *s++ = *e;
+        *e-- = tmp;
+    }
+}
+
 #define _QP_SIGNED_F(type, suffix, min, max) \
     static inline qrintf_t _qrintf_ ## suffix (qrintf_t ctx, type v) \
     { \
-        char tmp[sizeof(type) * 3]; \
-        size_t i = 0; \
+        size_t off = ctx.off; \
         if (v < 0) { \
             ctx.str[ctx.off++] = '-'; \
+            off = ctx.off; \
             if (v == min) { \
-                tmp[i++] = '1' + max % 10; \
+                ctx.str[ctx.off++] = '1' + max % 10; \
                 v = max / 10; \
             } else { \
                 v = -v; \
             } \
         } \
         do { \
-            tmp[i++] = '0' + v % 10; \
+            ctx.str[ctx.off++] = '0' + v % 10; \
         } while ((v /= 10) != 0); \
-        do { \
-            ctx.str[ctx.off++] = tmp[--i]; \
-        } while (i != 0); \
+        _qprintf_reverse(ctx.str + off, ctx.str + ctx.off);\
         return ctx; \
     }
 
@@ -104,14 +115,11 @@ _QP_SIGNED_F(long long, lld, LLONG_MIN, LLONG_MAX)
 #define _QP_UNSIGNED_F(type, suffix, max) \
     static inline qrintf_t _qrintf_ ## suffix (qrintf_t ctx, type v) \
     { \
-        char tmp[sizeof(type) * 3]; \
-        size_t i = 0; \
+        size_t off = ctx.off; \
         do { \
-            tmp[i++] = '0' + v % 10; \
+            ctx.str[ctx.off++] = '0' + v % 10; \
         } while ((v /= 10) != 0); \
-        do { \
-            ctx.str[ctx.off++] = tmp[--i]; \
-        } while (i != 0); \
+        _qprintf_reverse(ctx.str + off, ctx.str + ctx.off);\
         return ctx; \
     }