Convert char to string C

Question

I know the starting address of the string e g   char  buf  and the max length int l  of the string i e   total number of characters is less than or equal to l    What is the simplest way to get the value of the string from the specified memory segment  In other words  how to implement string retrieveString char  buf  int l     EDIT  The memory is reserved for writing and reading string of variable length  In other words  int l indicates the size of the memory and not the length of the string

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std  string str  char  const s    test    str assign s     string amp  assign  const char  s      gt   signature FYR  Reference s here

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There seems to be a few details left out of your explanation  but I will do my best     If these are NUL-terminated strings or the memory is pre-zeroed  you can just iterate down the length of the memory segment until you hit a NUL  0  character or the maximum length  whichever comes first   Use the string constructor  passing the buffer and the size determined in the previous step   string retrieveString  char  buf  int max          size t len   0      while   len  lt  max   amp  amp   buf  len        0               len               return string  buf  len         If the above is not the case  I m not sure how you determine where a string ends

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Use the string s constructor  basic string const charT  s size type n  const Allocator amp  a   Allocator       EDIT   OK  then if the C string length is not given explicitly  use the ctor   basic string const charT  s  const Allocator amp  a   Allocator

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std  string str buffer  buffer   length     Or  if the string already exists   str assign buffer  buffer   length     Edit  I m still not completely sure I understand the question   But if it s something like what JoshG is suggesting  that you want up to length characters  or until a null terminator  whichever comes first  then you can use this   std  string str buffer  std  find buffer  buffer   length    0

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char  charPtr    test string   cout  lt  lt  charPtr  lt  lt  endl   string str   charPtr  cout  lt  lt  str  lt  lt  endl

[c++] Convert char* to string C++

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