How to resolve the algorithm Call a foreign-language function step by step in the FutureBasic programming language

Published on 12 May 2024 09:40 PM
#Futurebasic

How to resolve the algorithm Call a foreign-language function step by step in the FutureBasic programming language

Table of Contents

Problem Statement

Show how a foreign language function can be called from the language.

As an example, consider calling functions defined in the C language. Create a string containing "Hello World!" of the string type typical to the language. Pass the string content to C's strdup. The content can be copied if necessary. Get the result from strdup and print it using language means. Do not forget to free the result of strdup (allocated in the heap).

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Call a foreign-language function step by step in the FutureBasic programming language

Source code in the futurebasic programming language

include "NSLog.incl"

BeginCDeclaration
  char *strdup(const char *src);
EndC

BeginCFunction
  char *strdup(const char *src) {
    char *dst = malloc(strlen (src) + 1);  // Space for length plus null
    if (dst == NULL) return NULL;          // No memory
    strcpy(dst, src);                      // Copy the characters
  return dst;                              // Return the new string
  }
EndC

BeginCCode
  NSLog( @"%s", strdup( "Hello, World!" ) );
EndC
  
HandleEvents

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