2.11BSD/ingres/source/gutil/concat.c

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/*
**  STRING CONCATENATE
**
**	The strings `s1' and `s2' are concatenated and stored into
**	`s3'.  It is ok for `s1' to equal `s3', but terrible things
**	will happen if `s2' equals `s3'.  The return value is is a
**	pointer to the end of `s3' field.
*/

char *concat(s1, s2, s3)
char	*s1, *s2, *s3;
{
	register char		*p;
	register char		*q;

	p = s3;
	q = s1;
	while (*q)
		*p++ = *q++;
	q = s2;
	while (*q)
		*p++ = *q++;
	*p = 0;
	return (p);
}