Strip first and last character from C string

Question

I have a C string that looks like  Nmy stringP   where N and P can be any character  How can I edit it into  my string  in C

User · Answer

Another option  again assuming that  edit  means you want to modify in place   void topntail char  str        size t len   strlen str       assert len  gt   2      or whatever you want to do with short strings     memmove str  str 1  len-2       str len-2    0      This modifies the string in place  without generating a new address as pmg s solution does  Not that there s anything wrong with pmg s answer  but in some cases it s not what you want

User · Answer

Further to  pmg s answer  note that you can do both operations in one statement   char mystr      Nmy stringP   char  p   mystr  p   strlen p -1    0    This will likely work as expected but behavior is undefined in C standard

User · Answer

The most efficient way      Note destroys the original string by removing it s last char    Do not pass in a string literal  char   getAllButFirstAndLast char  input      int len   strlen input      if len  gt  0      input     Go past the first char   if len  gt  1      input len - 2      0    Replace the last char with a null termination   return input              Call it like so char str 512   strcpy str   hello world    char  pMod   getAllButFirstAndLast str     The safest way   void getAllButFirstAndLast const char  input  char  output      int len   strlen input     if len  gt  0      strcpy output    input     if len  gt  1      output len - 2      0               Call it like so char mod 512   getAllButFirstAndLast  hello world   mod     The second way is less efficient but it is safer because you can pass in string literals into input   You could also use strdup for the second way if you didn t want to implement it yourself

User · Answer

To  quot remove quot  the 1st character point to the second character  char mystr      quot Nmy stringP quot   char  p   mystr  p        N  is not in  p      To remove the last character replace it with a   0   p strlen p -1    0      P  is not in  p   and it isn t in  mystr  either

[c] Strip first and last character from C string

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