C function to print color text with formatting

Question

this question helped me to print in different collors.

Iam trying to create a function which always prints the given char*in blue. I got so far:

#define KBLU  "\x1B[34m"
#define KWHT  "\x1B[37m"

void infoPrint(char* msg, ...)
{
    printf("%s", KBLU);
    printf(msg);
    printf("%s", KWHT);
}

When i call the function:

int value = 42;
infoPrint("Show value: %d.\n", value);

Iam getting the following output in the color blue:

Show value: 0.

For any reason the value 42 is not passed correctly.

If i change the function void infoPrint(char* msg, ...)to:

void infoPrint(char* msg, ...)
{
    printf(msg);
}

Iam getting the output (obviously in standard terminal color):

Show value: 42.

What happens to the value 42? Why is it 0 if I try to print in blue before printing the actual message?

Thank you

You need to use `vprintf`; if you use `printf` without giving proper arguments, the behaviour is *undefined*, and unfortunately it might even look as if it *works*, as in your 2nd case. — Antti Haapala -- Слава Україні, May 28 '18 at 20:39
@Antii Haapala Thank you this really is a duplicate. Didnt know what to google exactly. Should i delete this one? — Moritz Schmidt, May 28 '18 at 20:46
No, on the contrary, you've got upvotes here too, let it be open if someone else is wondering about the same thing. — Antti Haapala -- Слава Україні, May 28 '18 at 20:54

C function to print color text with formatting

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