Proper way to empty a C-String

Question

I ve been working on a project in C that requires me to mess around with strings a lot   Normally  I do program in C    so this is a bit different than just saying string empty     I m wondering what would be the proper way to empty a string in C   Would this be it    buffer 80     Hello World  n            strcpy buffer

User · Answer

I m a beginner but   Up to my knowledge the best way is  strncpy dest string    strlen dest string

User · Answer

needs name of string and its length will zero all characters other methods might stop at the first zero they encounter      void strClear char p   u8 len  u8 i 0           if len  while i lt len  p i  0 i

User · Answer

Two other ways are strcpy str       and string 0    0  To really delete the Variable contents  in case you have dirty code which is not working properly with the snippets above  P   use a loop like in the example below    include  lt string h gt        int i 0  for i 0 i lt strlen string  i          string i    0      In case you want to clear a dynamic allocated array of chars from the beginning  you may either use a combination of malloc   and memset   or - and this is way faster - calloc   which does the same thing as malloc but initializing the whole array with Null   At last i want you to have your runtime in mind  All the way more  if you re handling huge arrays  6 digits and above  you should try to set the first value to Null instead of running memset   through the whole String   It may look dirtier at first  but is way faster  You just need to pay more attention on your code     I hope this was useful for anybody

User · Answer

It depends on what you mean by  empty   If you just want a zero-length string  then your example will work   This will also work   buffer 0      0     If you want to zero the entire contents of the string  you can do it this way   memset buffer 0 strlen buffer      but this will only work for zeroing up to the first NULL character   If the string is a static array  you can use   memset buffer 0 sizeof buffer

User · Answer

If you are trying to clear out a receive buffer for something that receives strings I have found the best way is to use memset as described above   The reason is that no matter how big the next received string is  limited to sizeof buffer of course   it will automatically be an asciiz string if written into a buffer that has been pre-zeroed

User · Answer

Depends on what you mean by emptying  If you just want an empty string  you could do  buffer 0    0    If you want to set every element to zero  do  memset buffer  0  80

[c] Proper way to empty a C-String

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