从文本文件的一行中获取每个单词

Question

I am trying to read a txt file, and I can get the line which I want, but I can not print every words in this line one by one;

for example: the line looks like:

hello world 1 2 3

and I need print them one by one which looks like:

hello   
world   
1   
2   
3    

I got the segmentation fault core dumped error

char temp[256]；

while(fgets(temp, 256, fp) != NULL) {
    ...
    int tempLength = strlen(temp);
    char *tempCopy = (char*) calloc(tempLength + 1, sizeof(char));
    strncpy(temCopy, temp, tempLength); // segmentation fault core dumped here；
                                     // works fine with temp as "name country"
    name = strtok_r(tempCopy, delimiter, &context);
    country = strtok_r(Null, delimiter, &context);
    printf("%s\n", name);
    printf("%s\n", country);
}

Can anyone help me fix the code?
Thanks!

Answer 1

While read a line from a file you can invoke the following function:

 if( fgets (str, 60, fp)!=NULL ) {

                            puts(str);
                            token = strtok(str," ");
                            while(token != NULL)
                            {
                                    printf("%s\n",token);
                                    token = strtok(NULL," ");
                            }
                    }

Answer 2

Impleted with strtok()

char *p;
char temp[256];

while(fgets(temp,256,fp) != NULL){
  p = strtok (temp," ");
  while (p != NULL)
  {
    printf ("%s\n",p);
    p = strtok (NULL, " ");
  }
}

If you see man strtok You will found

BUGS

Be cautious when using these functions. If you do use them, note that: * These functions modify their first argument.

   * These functions cannot be used on constant strings.

   * The identity of the delimiting character is lost.

   * The strtok() function uses a static buffer while parsing, so it's not thread safe.  Use strtok_r() if this matters to you.

Try to make changes with strtok_r()