4

server-exp3/cgi-bin/add.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#define MAXLINE 8192
+
+int main(void) {
+    char *buf, *p;
+    char content[MAXLINE];
+    int n1=0, n2=0;
+
+    /* Extract the two arguments from standard input */
+    scanf("%d&%d", &n1, &n2);
+    
+    /* Make the response body */
+    sprintf(content, "Welcome to add.com: ");
+    sprintf(content, "%sTHE Internet addition portal.\r\n<p>", content);
+    sprintf(content, "%sThe answer is: %d + %d = %d\r\n<p>", 
+	    content, n1, n2, n1 + n2);
+    sprintf(content, "%sThanks for visiting!\r\n", content);
+
+    /* Generate the HTTP response */
+    printf("Content-length: %d\r\n", (int) strlen(content));
+    printf("Content-type: text/html\r\n\r\n");
+    printf("%s", content);
+    fflush(stdout);
+    exit(0);
+}