Z88dk: (Classic) ZX +3 fcntl not working

[suborb]

Investigation to follow

[DarwinNE]

Hello,
if it can be useful for you, here is a possible test program (called plus3file.c) I obtained from some existing code of mine:

~~~~

include

include

define BUFFERSIZE 128

void wtr(const char s)
{
for(; *s!='0';++s)
fputc(s,stdout);
}

int main(void)
{
FILE *f;
char buffer[BUFFERSIZE];

f=fopen("test.dat","w");

if(f==NULL) {
    wtr("Can not open file ");
    return 1;
}
fputs("SAVEDAWS2.1\n",f);

fputs("this is a test\n",f);
fclose(f);
f=fopen("test.dat","r");
fgets(buffer, BUFFERSIZE, f);
if(f==NULL) {
    wtr("Can not open file ");
    return 1;
}
if(strcmp(buffer, "SAVEDAWS2.1\n")!=0) {
    wtr("Incorrect format ");
    fclose(f);
    return 2;
}
wtr("Everything was OK.\n");
fclose(f);
return 0;

}
~~~~

The makefile is as follows:

~~
all:
zcc +zx -clib=ansi -lndos -create-app plus3file.c -subtype=plus3 -o plus3file
~~

I compile with no issues, but the file write fails when executing the program on Fuse:

I hope this helps,
D.

[suborb]

I can't spot anything obviously wrong at a first glance, so this one is on me!

EDIT: Of course, I should always take a second glance and use your compile line rather than the one I made myself.

You're adding the option -lndos which is the stub fcntl library, you need to use -lp3 to link in the +3 fcntl library.

[DarwinNE]

Thank you very much, that makes sense to me!!!