#include <string.h>

unsigned strlen (const char *str)
{
      unsigned i;
      for (i = 0; *str!=0; str++) i++;
      return i;
}

int strcmp(const char *pStr1, const char *pStr2)
{
    char c1, c2;
    int v;

    do {
        c1 = *pStr1++;
        c2 = *pStr2++;
        /* the casts are necessary when pStr1 is shorter & char is signed */
        v = (unsigned int)c1 - (unsigned int)c2;
    } while ((v == 0) && (c1 != '\0'));

    return v;
}