Parsing using strtok

Parsing Using strtok in C

The strtok function in C is used to tokenize a string based on a set of delimiter characters. Here's a step-by-step explanation of how to use strtok for parsing in C:

1. Include the Necessary Header File

2. Include the necessary header file for strtok: c #include <string.h>

3. Declare the Delimiter Characters

4. Define the delimiter characters that will be used to tokenize the string: c #define DELIMITERS " \t\r\n\a"

5. Tokenize the String

6. Use the strtok function to tokenize the input string: c char *token = strtok(inputString, DELIMITERS);

7. Iterate Through the Tokens

8. Iterate through the tokens obtained from the input string: ```c while (token != NULL) { // Process the token // ...

    // Get the next token
    token = strtok(NULL, DELIMITERS);
   

   } ```

9. Complete Example

10. Here's a complete example of a function that tokenizes a string using strtok: ```c #include #include #include

    #define DELIMITERS " \t\r\n\a"

    char tokenizeString(char *inputString) { int bufsize = 64, position = 0; char tokens = malloc(bufsize * sizeof(char)); char token;

     if (!tokens) {
         fprintf(stderr, "Allocation error\n");
         exit(EXIT_FAILURE);
     }
    
     token = strtok(inputString, DELIMITERS);
     while (token != NULL) {
         tokens[position] = token;
         position++;
    
         if (position >= bufsize) {
             bufsize += 64;
             tokens = realloc(tokens, bufsize  sizeof(char));
             if (!tokens) {
                 fprintf(stderr, "Allocation error\n");
                 exit(EXIT_FAILURE);
             }
         }
    
         token = strtok(NULL, DELIMITERS);
     }
     tokens[position] = NULL;
     return tokens;
    

    } ```

This function takes an input string, tokenizes it using strtok, and returns an array of tokens.

By following these steps, you can effectively parse a string using strtok in C.