First index of a non-Whitespace character in astring in C

Question

How do I get the index of the first non-whitespace character in a string. For example for the string " #$%abcd" I would expect getting the index 3 for #.

Answer 1

Why not code it instead of include other libraries:
Here is a starting point:

int main () 
{
    char s[] = "   #$%abcd\0";
    size_t i = 0;
    while(s[i] == ' ' || s[i] == '\t'|| s[i] == '\n' || s[i] == '\r' || s[i] == '\f' || s[i] == '\v')
    {
        ++i;
    }
    return i;
}

i is the index of the first non-whitespace char: