Diff: src/DatastructConversion/conversions.cpp

Revision:

4:91fa1c5ebbe1

diff -r 572adaa86366 -r 91fa1c5ebbe1 src/DatastructConversion/conversions.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/DatastructConversion/conversions.cpp	Wed Mar 27 06:08:17 2019 +0000
@@ -0,0 +1,140 @@
+/**
+ * @defgroup conversions Data Structure Conversions
+ * @{
+ */
+
+#include <sstream>
+#include <iomanip>
+#include <vector>
+#include "conversions.h"
+
+/**
+ *  @brief  Converts a C++ string to C-string; Use free() to release mem after copying the content.
+ *  @author Lau Lee Hong
+ *  @param  str C++ string
+ *  @return Pointer to a null-terminated array of character
+ */
+char* StringToChar(const std::string& str) 
+{
+    char* buffer = (char*)std::malloc(std::strlen(str.c_str()) + 1);
+    if(buffer != NULL)
+    {
+        std::strcpy(buffer, str.c_str());
+    }
+    
+    return buffer; 
+}
+
+/**
+ *  @brief  Converts an int-type to string-type hex.
+ *  @author Lau Lee Hong
+ *  @param  i Integer to be converted to hex string
+ *  @return Hexadecimal of string format
+ */
+std::string IntToHex(uint32_t i)
+{
+  std::stringstream stream;
+  stream << std::hex << i;
+  return stream.str();
+}
+
+/**
+ *  @brief  Converts an int-type to string.
+ *  @author Lau Lee Hong
+ *  @param  i (int)integer to be converted (std::string)integer
+ *  @return Integer of string format
+ */
+std::string IntToString(int v)
+{
+    std::ostringstream oss;
+    oss << v;
+    return oss.str();
+}
+
+/**
+ *  @brief  Converts an double-type to a C-string with variable number of decimal places.
+ *  @author Lau Lee Hong
+ *  @param  str             buffer to store result
+ *  @param  v               value
+ *  @param  decimal_digits  number of decimal places
+ *  @return Null-terminated charcter array of double value with user-defined number of decimal places
+ */
+char* DoubleToChar(char* str, double v, int decimal_digits)
+{
+    int i = 1;
+    int int_part, fract_part;
+    int len;
+    char *ptr;
+
+    /* Prepare decimal digits multiplicator */
+    for (; decimal_digits != 0; i *= 10, decimal_digits--);
+
+    /* Calculate integer & fractional parts */
+    int_part = (int)v;
+    fract_part = (int)((v - (double)(int)v) * i);
+
+    /* Fill in integer part */
+    std::sprintf(str, "%i.", int_part);
+
+    /* Prepare fill in of fractional part */
+    len = std::strlen(str);
+    ptr = &str[len];
+
+    /* Fill in leading fractional zeros */
+    for (i /= 10; i > 1; i /= 10, ptr++)
+    {
+        if (fract_part >= i)
+        {
+            break;
+        }
+        *ptr = '0';
+    }
+
+    /* Fill in (rest of) fractional part */
+    std::sprintf(ptr, "%i", fract_part);
+
+    return str;
+}
+
+/**
+ *  @brief  Converts a C++ string to an integer
+ *  @author Lee Tze Han
+ *  @param  str C++ string
+ *  @return Integer from string representation
+ */
+int StringToInt(const std::string& str)
+{
+    std::istringstream iss(str);
+    int v;
+    iss >> v;
+    return v;   
+}
+
+/**
+ *  @brief  Converts a time_t object (from NTPClient) to a C++ string
+ *  @author Lee Tze Han
+ *  @param  time time_t representing current time
+ *  @return String representation of the underlying typedef'd uint32_t
+ */
+//std::string TimeToString(const std::time_t time)
+//{
+//    std::ostringstream oss;
+//    oss << time;
+//    return oss.str();   
+//}
+//
+///**
+// *  @brief  Converts a C++ string to time_t object
+// *  @author Lee Tze Han
+// *  @param  str C++ string
+// *  @return time_t from string representation
+// */
+//std::time_t StringToTime(const std::string& str)
+//{
+//    std::istringstream iss(str);
+//    std::time_t time;
+//    iss >> time;
+//    return time;    
+//}
+
+/** @}*/
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