récupération des données d'un formulaire html via un script cgi en C

<div id="generic_narrow_column">
		<!-- Home Page Signup Form -->
<style>
/**
 * signup form
 **/

#reg-form-body{
	background: url('../yolaImages/box_signup.png') repeat-x;	
	text-align:center;
	padding-top:20px;
	height:370px;
}
#reg-form-body.domain {
    background-image: none;
    padding-top: 0px;
}
	#reg-form-body small {
		font-size:11px;
	}

	#reg-form-body #headerContainer{
		width:230px;
		margin-left:auto;margin-right:auto;
		padding-bottom:1px;
		text-align:left;
	}

    #reg-form-body.domain #headerContainer {
        width: auto;
    }
	#reg-form-body #headerContainer h2{
		margin-top:0px;padding-top:0px;
		margin-bottom:0px;
		font-size:24px;
		font-weight:normal;
	}
    #reg-form-body.domain #headerContainer h2 {
        color:#660000;
        font-weight: bold;
    }
	
	#reg-form-body #headerContainer h4{
		margin-top:0px;
		font-size:14px;
		font-weight:normal;
        color:#000;
	}
	
	#reg-form-body .input{
		width:135px;
		color:#999999;
		float:right;
		margin-right:25px;
	}
	
	#reg-form-body .reg-field-lbl{
		float:left;margin-left:20px;padding-top:5px;
	}
	#reg-form-body.domain .reg-field-lbl {
    	margin-left:0px;
    }
	#reg-form-body .signup_field {
		margin-top:10px;
		height:24px;
	}
	#reg-form-bottom {
		width:240px;
		text-align:left;
		margin-left:auto; margin-right:auto;
	}
    #reg-form-bottom.domain {
        margin-left:auto; margin-right:120px;
	}

	#reg-form-bottom input {
		margin-left:0px;
		margin-top:0px;	
	}
	#reg-form-body.domain input.input {
        width: 330px;
    }

</style>



<script type="text/javascript" src = "http://www.yola.com/javascript/validateSignUp.js?stamp=4386" ></script>	


<div id="reg-form-body"  align="center">
	<div id="headerContainer" >
		<h2 >nom de ton formulaire</h2>
		<h4 >sous nom de ton formulaire</h4>
	</div>
	
	<form id="frmRegister" name="frmRegister" action="http://www.yola.com/actions/doseosignup"  method="post" accept-charset="utf-8" class='signup_form' >

		<div class="signup_field" >
						<span class='reg-field-lbl' >Full name</span>
			<input class="input"  id="rfname" type="text" value="" alt="" name="Fullname"  />
			<div class="spacer"></div>
		</div>
		<div class="signup_field" >
						<span class='reg-field-lbl' >Email</span>
			<input class="input"  id="remail" type="text" value="" alt="" name="Email"  />
			<div class="spacer"></div>
		</div>
		<div class="signup_field" >
			<span class='reg-field-lbl' >Confirm email</span>
			<input class="input"  id="cremail" type="text" value="" alt="" name="cEmail"  />
			<div class="spacer"></div>
		</div>
		<div class="signup_field" >
			<span class='reg-field-lbl' >Password</span>
			<input class="input"  id="rpassword" type="password" name="Password" alt="" value="" />
			<div class="spacer"></div>
		</div>
		<div class='spacer'></div>
		<div id="reg-form-bottom" >
		
			<div style="margin-top:10px;" >		
				<table width="100%" cellspacing="0" cellpadding="0">
					<tr><td valign = "top">
						<input type="checkbox" checked="checked" id="chknewsletter" name="chknewsletter" value="1" />
					</td><td>
						<label for="chknewsletter" style="font-size:12px;">
						m'inscrir à la newsletter. 
						</label><br />
						
					</td></tr>
				</table>
			</div>
			<div style="margin-top:10px;">
				                <input type="image" src="http://www.icone-gif.com/gif/webmaster/cliqueici/clique-ici-gif-003.gif" onclick="javascript: return validatesignup();" name="btnRegister"  id="btnRegister" value="Log in" />
			            </div>
			<div style="clear:both; margin-top:10px;font-size:small">
				ex:blablabla</a> blablabla</a>.			</div>
		</div>
        		
	</form>
</div>

</div>	

<div class="spacer">
	&nbsp;
</div>

<div id="bottomRibbonContainer" >
	<div id="bottomRibbon" >
		<div id="media">