操作系统SunOS 4.1.3版本的源码

				#if !defined(lint) && defined(SCCSIDS)				static	char sccsid[] = "@(#)strrchr.c 1.1 92/07/30 SMI"; /* from S5R2 1.2 */				#endif								/*LINTLIBRARY*/				/*				 * Return the ptr in sp at which the character c last				 * appears; NULL if not found				*/								#define NULL 0								char *				strrchr(sp, c)				register char *sp, c;				{					register char *r;									r = NULL;					do {						if(*sp == c)							r = sp;					} while(*sp++);					return(r);				}