Listing 2

/*
 * string.h - string hadling (for cc on UNIX 4.2 BSD)
 */

#ifndef _STRING_H_INCLUDED

#define NULL ((char *)0)

#ifndef _SIZE_T_DEFINED
typeder unsigned size_t;
#define _SIZE_T_DEFINED
#endif

char *strcat();
int strcmp();
char *strcpy();
size_t strlen();
char *strncat();
int strncmp();
char *strncpy();

/*
 * interim macro definitions for functions
 */
char *index();
#define strchr(s, c) index(s, c)

extern int sys_nerr;
extern char *sys_errlist[];
#define strerror(e) \
   ((e) < sys_nerr ? sys_errlist[e] : "?no message?")

char *rindex();
#define strrchr(s, c) rindex(s, c)

/*
 * missing functions
 */
char *memchr();
int memcmp();
char *memcpy();
char *memmove();
char *memset();
int strcoll();
size_t strcspn();
char *strpbrk();
size_t strspn();
char *strstr();
char *strtok();
size_t strxfrm();

#define _STRING H_INCLUDED

#endif