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In place of gets(), you can use a function that does check the length of the user input. The following is a function called safe_gets() that does the trick: #define EOLN '\n' void safe_gets (char *input, int max_chars) { int count = 0; char next_char; do { next_char = getchar(); if (next_char != EOLN) input[count++] = next_char; } while ((count < max_chars-1) && (next_char != EOLN)); input[count]=0; } The safe_gets() function is called differently than gets(). The gets() function only takes a buffer as input. The safe_gets() function takes two parameters: a buffer called input, and max_chars, an integer that specifies the maximum number of characters that the function should put into the buffer. As safe_gets() adds characters into the input buffer, it continuously checks to make sure it is not writing more characters than the input buffer can hold. The safe_gets() function has two local variables. The first is count, the current number of characters that have been input. The other is next_char, a one-byte character that stores the next character of input. Using a function called getchar(),5 safe_gets() accepts one character of input at a time, so long as count is less than the maximum number of characters it is allowed to accept and the user input has not ended yet. The getchar() function returns EOLN (for end of line) when there is no more user input to accept. When the do...while loop starts executing, count is less than max_chars-1, and it is safe to put next_char into the input buffer because you are not going to overrun or overflow the

Next, you need to add references to both the Spark and Spark.Web.Mvc assemblies to your project, as shown in figure 10.2. With the Spark assembly references added to your project, you can configure ASP.NET MVC to use Spark as its view engine. Spark has additional configuration, which you can either place in your Web.config file or in code. For this example, we ll configure Spark in code, but the Spark documentation has full examples of both options. Our Spark configuration is shown in listing 10.11.

The size of a page of the adjustment. You should set this to zero when you use GtkAdjustment for GtkSpinButton. The increment that will be moved in an individual step. For example, with GtkSpinButton, a single step will be taken when an arrow button is pressed. The maximum gdouble value that the adjustment can reach. The current value of the adjustment, which is always between lower and upper.

var settings = new SparkSettings() .SetDebug(true) .AddAssembly("SparkViewExample") .AddNamespace("System") .AddNamespace("System.Collections.Generic") .AddNamespace("System.Linq") .AddNamespace("System.Web.Mvc") .AddNamespace("System.Web.Mvc.Html"); ViewEngines.Engines.Add(new SparkViewFactory(settings));

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5. The getchar() function is a standard C library function like gets(), but it only reads one character of user input at a time.

We place the configuration code into the Application_Start method in our Global.asax.cs file, because the Spark configuration and MVC view engine configuration only need to happen once per application domain. In the first section, we create a SparkSettings object, configuring the compilation mode, and adding our project assembly and various assemblies for compilation. This section is similar to configuring the WebFormViewEngine in the Web.config file. Next, we add a new SparkViewFactory instance to the System.Web.Mvc.ViewEngines.Engines collection; the ViewEngines class allows additional view engines to be configured for our application. Then we pass our SparkSettings object to the SparkViewFactory instance. That s all it takes to configure Spark! Now that Spark is configured, we can move on to creating views for our example.

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10.3.2 Simple Spark view example On the controller and model pieces of our MVC application, we won t see any changes as a result of our new view engine. In our example, we want to display a list of Product model objects, as shown in listing 10.12.