C Standard library functions: String. h: strchr, implementation of strrchr

/*  Strchr  */  /*  This function is used to locate the first occurrence of a character in a string.  */  /*  If it is found, the absolute address is returned. If it is not found, null is returned.  */  Char * /*  Returns the absolute position of the first occurrence of a string.  */  My_strchr (  Const   Char * SRC,/*  String to be searched  */      Char Ch /*  Characters to be searched  */  ){  While (* SRC! = CH) /*  Test from the first character. If not equal, null is returned.  */  {  If (* Src = '  \ 0 '  )  Return  NULL; SRC ++; /*  Point to the next character  */  }  Return ( Char *) SRC; /*  This is returned only when the first character is the character to be searched.  */  }  /*  Strrchr */  /*  This function returns the position of the last occurrence of a character in the string.  */  /*  Locate: returns the absolute position. Not found: returns NULL  */  Char * My_strrchr (  Const   Char * SRC, /*  String to be searched  */      Char Ch /* Characters to be searched  */  ){  Const   Char * PTR;  For (PTR = NULL; ++ SRC) /*  Match from the first character  */  {  If (* Src = CH) /*  No value can be reassigned once.  */ PTR = SRC;  If (* Src = '  \ 0  ' ) /*  End of arrival  */              Return ( Char * ) PTR;} the girl does not cry (QQ:  191035066 )@ 2012 - 05 -29   16 : 51 : 48 @ Http: //  Www.cnblogs.com/nbsofer