Test program from the URL referenced.

test.c (text/plain), 1018 bytes, created by Martin Baute on 2009-09-15 15:24:15 UTC

#include <stdio.h>
#include <stdlib.h>

int main()
{
    char * string = "0xz";  // valid hex prefix, followed by invalid digit
    int i = -1;             // result value, initialized to impossible value
    int count = -1;         // count of scanf()-parsed characters, likewise initialized
    char c;                 // holds first scanf()-unparsed character
    char * endptr = NULL;   // points to first strtoul()-unparsed character

    // scan string with scanf(), putting result in i, characters parsed in 'count',
    // and the next character to be parsed in 'c'.
    sscanf( string, "%x%n%c", &i, &count, &c );
    // print results
    printf( "sscanf():  Value %d - Consumed %d - Next char %c\n", i, count, c );

    // scan string with strtoul(), putting result in i, and pointer to next
    // character to be parsed in 'c'.
    i = strtoul( string, &endptr, 16 );
    // print results
    printf( "strtoul(): Value %d - Consumed %d - Next char %c\n", i, ( endptr - string ), *endptr );
    return 0;
}