Feature/bacnet-str-itoa-helpers (#1157)

* Added BACnet library itoa, ltoa, ultoa, dtoa, and utoa ASCII functions for ease of printing formatted values.

* Exposed the bacnet_byte_reverse_bits() function API.

src/bacnet/bacstr.c

@@ -1775,3 +1775,85 @@ bool bacnet_string_to_unsigned(
 
     return true;
 }
+
+/**
+ * @brief General purpose print formatter which returns the formatted string
+ * @param buffer - destination string
+ * @param count - length of the destination string
+ * @param format - format string
+ * @return character string buffer
+ */
+char *
+bacnet_sprintf_to_ascii(char *buffer, size_t size, const char *format, ...)
+{
+    va_list args;
+
+    va_start(args, format);
+    /* The vsnprintf function always writes a null terminator,
+       even if it truncates the output. */
+    (void)vsnprintf(buffer, size, format, args);
+    va_end(args);
+
+    return buffer;
+}
+
+/**
+ * @brief Convert a value into a string and return the base-10 string
+ * @param value Number to be converted.
+ * @param buffer Buffer that holds the result of the conversion.
+ * @param size Length of the buffer in units of the character type.
+ * @param precision Number of decimal places
+ * @return character string buffer
+ */
+char *bacnet_dtoa(double value, char *buffer, size_t size, unsigned precision)
+{
+    return bacnet_sprintf_to_ascii(buffer, size, "%.*f", precision, value);
+}
+
+/**
+ * @brief Convert a value into a string and return the base-10 string
+ * @param value Number to be converted.
+ * @param buffer Buffer that holds the result of the conversion.
+ * @param size Length of the buffer in units of the character type.
+ * @return character string buffer
+ */
+char *bacnet_itoa(int value, char *buffer, size_t size)
+{
+    return bacnet_sprintf_to_ascii(buffer, size, "%d", value);
+}
+
+/**
+ * @brief Convert a value into a string and return the base-10 string
+ * @param value Number to be converted.
+ * @param buffer Buffer that holds the result of the conversion.
+ * @param size Length of the buffer in units of the character type.
+ * @return character string buffer
+ */
+char *bacnet_ltoa(long value, char *buffer, size_t size)
+{
+    return bacnet_sprintf_to_ascii(buffer, size, "%ld", value);
+}
+
+/**
+ * @brief Convert a value into a string and return the base-10 string
+ * @param value Number to be converted.
+ * @param buffer Buffer that holds the result of the conversion.
+ * @param size Length of the buffer in units of the character type.
+ * @return character string buffer
+ */
+char *bacnet_utoa(unsigned value, char *buffer, size_t size)
+{
+    return bacnet_sprintf_to_ascii(buffer, size, "%u", value);
+}
+
+/**
+ * @brief Convert a value into a string and return the base-10 string
+ * @param value Number to be converted.
+ * @param buffer Buffer that holds the result of the conversion.
+ * @param size Length of the buffer in units of the character type.
+ * @return character string buffer
+ */
+char *bacnet_ultoa(unsigned long value, char *buffer, size_t size)
+{
+    return bacnet_sprintf_to_ascii(buffer, size, "%lu", value);
+}