Inverse of snprintf

Question

Is there any function in C or C++ to perform the inverse of an snprintf, such that

 char buffer[256]
 snprintf( buffer, 256, "Number:%i", 10);

 // Buffer now contains "Number:10"

 int i;
 inverse_snprintf(buffer,"Number:%i", &i);

 // i now contains 10

I can write a function that meets this requirement myself, but is there already one within the standard libraries?

Answer 1

Yes, there is sscanf(). It returns the number of tokens successfully matched to the input, so you can check the return value to see how far it made it into the input string.

if (sscanf(buffer, "Number:%i", &i) == 1) {
    /* The number was successfully parsed */
}