How to split a string to 2 strings in C

Question

I was wondering how you could take 1 string  split it into 2 with a delimiter  such as space  and assign the 2 parts to 2 separate strings   I ve tried using strtok   but to no avail

User · Answer

If you re open to changing the original string  you can simply replace the delimiter with  0  The original pointer will point to the first string and the pointer to the character after the delimiter will point to the second string  The good thing is you can use both pointers at the same time without allocating any new string buffers

User · Answer

If you have a char array allocated you can simply put a   0  wherever you want  Then point a new char   pointer to the location just after the newly inserted   0    This will destroy your original string though depending on where you put the   0

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include  lt string h gt   char  token  char line      SEVERAL WORDS   char  search             Token will point to  SEVERAL   token   strtok line  search        Token will point to  WORDS   token   strtok NULL  search       Update  Note that on some operating systems  strtok man page mentions      This interface is obsoleted by strsep 3     An example with strsep is shown below   char  token  char  string  char  tofree   string   strdup  abc def ghi     if  string    NULL       tofree   string     while   token   strsep  amp string           NULL          printf   s n   token          free tofree

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You can use strtok   for that Example  it works for me   include  lt stdio h gt   include  lt string h gt   int main          char str     - This  a sample string        char   pch      printf   Splitting string    s   into tokens  n  str       pch   strtok  str     -        while  pch    NULL                printf    s n  pch           pch   strtok  NULL      -              return 0

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This is how you implement a strtok   like function  taken from a BSD licensed string processing library for C  called zString     Below function differs from the standard strtok   in the way it recognizes consecutive delimiters  whereas the standard strtok   does not   char  zstring strtok char  str  const char  delim        static char  static str 0          var to store last address        int index 0  strlength 0           integers for indexes        int found   0                      check if delim is found            delimiter cannot be NULL       if no more char left  return NULL as well            if  delim  0     str    0  amp  amp  static str    0           return 0       if  str    0          str   static str          get length of string        while str strlength           strlength            find the first occurance of delim        for  index 0 index lt strlength index            if  str index   delim 0                 found 1              break                    if delim is not contained in str  return str        if   found            static str   0          return str                check for consecutive delimiters      if first char is delim  return delim            if  str 0   delim 0             static str    str   1           return  char   delim                terminate the string       this assignmetn requires char    so str has to       be char   rather than  char            str index      0           save the rest of the string        if   str   index   1   0          static str    str   index   1       else         static str   0           return str      Below is an example code that demonstrates the usage    Example Usage       char str      A B   C         printf  1  s n  zstring strtok s              printf  2  s n  zstring strtok NULL              printf  3  s n  zstring strtok NULL              printf  4  s n  zstring strtok NULL              printf  5  s n  zstring strtok NULL              printf  6  s n  zstring strtok NULL           Example Output       1 A       2 B       3         4         5 C       6  null    You can even use a while loop  standard library s strtok   would give the same result here   char s    some text here  do       printf   s n  zstring strtok s          while zstring strtok NULL

User · Answer

You can do   char str     Stackoverflow Serverfault   char piece1 20            piece2 20        char   p   p   strtok  str          call the strtok with str as 1st arg for the 1st time  if  p    NULL     check if we got a token        strcpy piece1 p      save the token      p   strtok  NULL           subsequent call should have NULL as 1st arg      if  p    NULL     check if we got a token          strcpy piece2 p      save the token    printf   s     s n  piece1 piece2      prints Stackoverflow    Serverfault   If you expect more than one token its better to call the 2nd and subsequent calls to strtok in a while loop until the return value of strtok becomes NULL

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char  line   strdup  user name       don t do char  line    user name   see Note  char  first part   strtok line          first part points to  user  char  sec part   strtok NULL            sec part points to  name    Note  strtok modifies the string  so don t hand it a pointer to string literal

User · Answer

For purposes such as this  I tend to use strtok r   instead of strtok       For example      int main  void    char str 128   char  ptr   strcpy  str   123456 789asdf    strtok r  str        amp ptr    printf     s     s  n   str  ptr   return 0      This will output       123456    789asdf   If more delimiters are needed  then loop   Hope this helps

[c] How to split a string to 2 strings in C

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