2.9BSD/usr/src/cmd/refer/refer/deliv2.c

# include "stdio.h"
hash (s)
char *s;
{
	int c, n;
	for(n=0; c= *s; s++)
		n += (c*n+ c << (n%4));
	return(n>0 ? n : -n);
}
err (s, a)
char *s;
{
	fprintf(stderr, "Error: ");
	fprintf(stderr, s, a);
	putc('\n', stderr);
	cleanup();
	exit(1);
}
prefix(t, s)
char *t, *s;
{
	int c, d;
	while ( (c= *t++) == *s++)
		if (c==0) return(1);
	return(c==0 ? 1: 0);
}
mindex(s, c)
char *s;
{
	register char *p;
	for( p=s; *p; p++)
		if (*p ==c)
			return(p);
	return(0);
}
zalloc(m,n)
{
	int t;
# if D1
	fprintf(stderr, "calling calloc for %d*%d bytes\n",m,n);
# endif
	t = calloc(m,n);
# if D1
	fprintf(stderr, "calloc returned %o\n", t);
# endif
	return(t);
}