Some string operations written in C from the lib, funny to see these and how ubiquitous they still are:

/* * @(#)strops.c 1.1 92/07/30 Copyr 1985 Sun Micro

* Assorted string operations /

/ * Compare strings: s1>s2: >0 s1==s2: 0 s1<s2: <0 /

strcmp(s1, s2) register char s1, s2;

{

while (s1 == s2++)

  if (*s1++=='\0')

   return (0);

 return (*s1 - *--s2);

}

/* * Returns the number of * non-NULL bytes in string argument. /

strlen(s)

register char s;

{

register int n;

n = 0;

while (*s++)

  n++;

 return (n);

}