From 80f9fc5842e9a712d625f8370159d645dae1d930 Mon Sep 17 00:00:00 2001
From: ValKmjolnir <lhk101lhk101@qq.com>
Date: Wed, 11 Oct 2023 00:20:02 +0800
Subject: [PATCH] :zap: can convert minimum double from string

---
 src/nasal_misc.cpp | 9 ++++++---
 test/scalar.nas    | 2 ++
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/nasal_misc.cpp b/src/nasal_misc.cpp
index 374e190..183ec9e 100644
--- a/src/nasal_misc.cpp
+++ b/src/nasal_misc.cpp
@@ -120,7 +120,8 @@ f64 oct2f(const char* str) {
 // but this also makes 0.1+0.2==0.3,
 // not another result that you may get in other languages.
 f64 dec2f(const char* str) {
-    f64 ret = 0, negative = 1, num_pow = 0;
+    f64 ret = 0, num_pow = 0;
+    bool negative = false;
     while('0'<=*str && *str<='9') {
         ret = ret*10+(*str++-'0');
     }
@@ -147,7 +148,7 @@ f64 dec2f(const char* str) {
         return nan("");
     }
     if (*str=='-' || *str=='+') {
-        negative = (*str++=='-'? -1:1);
+        negative = (*str++=='-');
     }
     if (!*str) {
         return nan("");
@@ -159,7 +160,9 @@ f64 dec2f(const char* str) {
     if (*str) {
         return nan("");
     }
-    return ret*std::pow(10, negative*num_pow);
+    return negative?
+        ret*std::pow(10, 1-num_pow)*0.1:
+        ret*std::pow(10, num_pow-1)*10;
 }
 
 f64 str2num(const char* str) {
diff --git a/test/scalar.nas b/test/scalar.nas
index 4d853f7..afad81f 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -234,4 +234,6 @@ for(var a=0;a<16;a+=1) {
 }
 
 print([0, 1, 2]~[3, 4, 5], "\n");
+
+print(num("1.79769313486231570814527423731704357e+308"), "\n");
 print(num("4.94065645841246544176568792868e-324"), "\n");
\ No newline at end of file