strrchr 字符在字符串中最后一次出现的位置

;***

;char *strrchr(string, ch) - find last occurrence of ch in string

;

;Purpose:

;       Finds the last occurrence of ch in string.  The terminating

;       null character is used as part of the search.

;

;       Algorithm:

;       char *

;       strrchr (string, ch)

;             char *string, ch;

;             {

;             char *start = string;

;

;             while (*string++)

;                     ;

;             while (--string != start && *string != ch)

;                     ;

;             if (*string == ch)

;                     return(string);

;             return(NULL);

;             }

;

;Entry:

;       char *string - string to search in

;       char ch - character to search for

;

;Exit:

;       returns a pointer to the last occurrence of ch in the given

;       string

;       returns NULL if ch does not occurr in the string

;

;Uses:

;

;Exceptions:

;

;*******************************************************************************