Diff: consolelogger.c

Revision:

27:8656a313842b

Parent:

25:8507bf644fdf

--- a/consolelogger.c	Mon May 08 10:51:21 2017 -0700
+++ b/consolelogger.c	Mon May 22 10:35:55 2017 -0700
@@ -7,15 +7,204 @@
 #include "azure_c_shared_utility/xlogging.h"
 #include "azure_c_shared_utility/consolelogger.h"
 
+#if (defined(_MSC_VER)) && (!(defined WINCE))
+#include "windows.h"
+
+/*returns a string as if printed by vprintf*/
+static char* vprintf_alloc(const char* format, va_list va)
+{
+    char* result;
+    int neededSize = vsnprintf(NULL, 0, format, va);
+    if (neededSize < 0)
+    {
+        result = NULL;
+    }
+    else
+    {
+        result = (char*)malloc(neededSize + 1);
+        if (result == NULL)
+        {
+            /*return as is*/
+        }
+        else
+        {
+            if (vsnprintf(result, neededSize + 1, format, va) != neededSize)
+            {
+                free(result);
+                result = NULL;
+            }
+        }
+    }
+    return result;
+}
+
+/*returns a string as if printed by printf*/
+static char* printf_alloc(const char* format, ...)
+{
+    char* result;
+    va_list va;
+    va_start(va, format);
+    result = vprintf_alloc(format, va);
+    va_end(va);
+    return result;
+}
+
+/*returns NULL if it fails*/
+static char* lastErrorToString(DWORD lastError)
+{
+    char* result;
+    if (lastError == 0)
+    {
+        result = printf_alloc(""); /*no error should appear*/
+        if (result == NULL)
+        {
+            (void)printf("failure in printf_alloc");
+        }
+        else
+        {
+            /*return as is*/
+        }
+    }
+    else
+    {
+        char temp[MESSAGE_BUFFER_SIZE];
+        if (FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS, NULL, lastError, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), temp, MESSAGE_BUFFER_SIZE, NULL) == 0)
+        {
+            result = printf_alloc("GetLastError()=0X%x", lastError);
+            if (result == NULL)
+            {
+                (void)printf("failure in printf_alloc\n");
+                /*return as is*/
+            }
+            else
+            {
+                /*return as is*/
+            }
+        }
+        else
+        {
+            /*eliminate the \r or \n from the string*/
+            /*one replace of each is enough*/
+            char* whereAreThey;
+            if ((whereAreThey = strchr(temp, '\r')) != NULL)
+            {
+                *whereAreThey = '\0';
+            }
+            if ((whereAreThey = strchr(temp, '\n')) != NULL)
+            {
+                *whereAreThey = '\0';
+            }
+
+            result = printf_alloc("GetLastError()==0X%x (%s)", lastError, temp);
+
+            if (result == NULL)
+            {
+                (void)printf("failure in printf_alloc\n");
+                /*return as is*/
+            }
+            else
+            {
+                /*return as is*/
+            }
+        }
+    }
+    return result;
+}
+/*this function will use 1x printf (in the happy case) .*/
+/*more than 1x printf / function call can mean intermingled LogErrors in a multithreaded env*/
+/*the function will also attempt to produce some human readable strings for GetLastError*/
+void consolelogger_log_with_GetLastError(const char* file, const char* func, int line, const char* format, ...)
+{
+	DWORD lastError;
+	char* lastErrorAsString;
+	int lastErrorAsString_should_be_freed;
+	time_t t;
+    int systemMessage_should_be_freed;
+	char* systemMessage;
+    int userMessage_should_be_freed;
+	char* userMessage;
+
+    va_list args;
+    va_start(args, format);
+
+    /*this is what this case will do:
+    1. snip the last error
+    2. create a string with what that last error means
+    3. printf the system message (__FILE__, __LINE__ etc) + the last error + whatever the user wanted
+    */
+    /*1. snip the last error*/
+    lastError = GetLastError();
+
+    /*2. create a string with what that last error means*/
+    lastErrorAsString = lastErrorToString(lastError);
+    if (lastErrorAsString == NULL)
+    {
+        (void)printf("failure in lastErrorToString");
+        lastErrorAsString = "";
+        lastErrorAsString_should_be_freed = 0;
+    }
+    else
+    {
+        lastErrorAsString_should_be_freed = 1;
+    }
+
+    t = time(NULL);
+    systemMessage = printf_alloc("Error: Time:%.24s File:%s Func:%s Line:%d %s", ctime(&t), file, func, line, lastErrorAsString);
+
+    if (systemMessage == NULL)
+    {
+        systemMessage = "";
+        (void)printf("Error: [FAILED] Time:%.24s File : %s Func : %s Line : %d %s", ctime(&t), file, func, line, lastErrorAsString);
+        systemMessage_should_be_freed = 0;
+    }
+    else
+    {
+        systemMessage_should_be_freed = 1;
+    }
+
+    userMessage = vprintf_alloc(format, args);
+    if (userMessage == NULL)
+    {
+        (void)printf("[FAILED] ");
+        (void)vprintf(format, args);
+        (void)printf("\n");
+        userMessage_should_be_freed = 0;
+    }
+    else
+    {
+        /*3. printf the system message(__FILE__, __LINE__ etc) + the last error + whatever the user wanted*/
+        (void)printf("%s %s\n", systemMessage, userMessage);
+        userMessage_should_be_freed = 1;
+    }
+
+    if (userMessage_should_be_freed == 1)
+    {
+        free(userMessage);
+    }
+
+    if (systemMessage_should_be_freed == 1)
+    {
+        free(systemMessage);
+    }
+
+    if (lastErrorAsString_should_be_freed == 1)
+    {
+        free(lastErrorAsString);
+    }
+    va_end(args);
+}
+#endif
+
 #if defined(__GNUC__)
 __attribute__ ((format (printf, 6, 7)))
 #endif
-void consolelogger_log(LOG_CATEGORY log_category, const char* file, const char* func, const int line, unsigned int options, const char* format, ...)
+void consolelogger_log(LOG_CATEGORY log_category, const char* file, const char* func, int line, unsigned int options, const char* format, ...)
 {
+    time_t t;
     va_list args;
     va_start(args, format);
 
-    time_t t = time(NULL); 
+    t = time(NULL); 
     
     switch (log_category)
     {
@@ -29,12 +218,13 @@
         break;
     }
 
-	(void)vprintf(format, args);
-	va_end(args);
+    (void)vprintf(format, args);
+    va_end(args);
 
     (void)log_category;
-	if (options & LOG_LINE)
-	{
-		(void)printf("\r\n");
-	}
+    if (options & LOG_LINE)
+    {
+        (void)printf("\r\n");
+    }
 }
+