Thread: (MinGW)I don't know how to link files together

I tried something like this:

The main.c

Code:

#include <malloc.h>
#include <stdio.h>

#include "GetLine.h"

int main(void){
    char *Input = (char *)malloc(sizeof(char) * 100);

    GetLine(Input, 100)

    printf("%s\n", Input);

    return 0;
}

At the end it gave me these:

Code:

C:\HChingWong\MineSweeper>gcc -o main.exe main.c GetLine.c
GetLine.c: In function 'GetLine':
GetLine.c:2:14: error: 'NULL' undeclared (first use in this function)
GetLine.c:2:14: note: each undeclared identifier is reported only once for each
function it appears in
GetLine.c:9:22: warning: incompatible implicit declaration of built-in function
'strchr'

How can I solve these disgusting things?

And the other things I think are less useful.

The GetLine.h

Code:

int GetLine(char *, int);

And The GetLine.c

Code:

int GetLine(char *Input, const int SizeTag){
	if(Input == NULL){
		puts("Unallocated input buffer.");
		return -1;
	}

	fgets(Input, SizeTag);

	char *LastCharPtr = strchr(Input, '\n');
	if(!LastCharPtr != NULL){
		puts("Input is too long.\n");
                *Input = '\0';
		return -1;
	}
	*LastCharPtr = '\0';

	return 0;
}

In your GetLine.c, you need to include header files for all the functions/macros that you are using.
ie. fgets, NULL, => stdio.h
strchr => string.h

Edit: fgets() expects three parameters.

Btw, malloc.h is non-standard. Use stdlib.h.

Thank you very much. I get it. I can only include files in the source files and not the headers. Thank you for the extra commands, too.

Erm, yes you can include headers in header files.