Split String with Multiple Delimiters Using Strtok in C
I Have Problem with Splitting a String. the Code Below Works, but Only If Between Strings Are ' ' (Spaces). but I Need to Split Strings Even If There Is Any...
I have problem with splitting a string. The code below works, but only if between strings are ' ' (spaces). But I need to split strings even if there is any whitespace char. Is strtok() even necessary?
char input[1024];
char *string[3];
int i=0;
fgets(input,1024,stdin)!='\0') //get input
{
string[0]=strtok(input," "); //parce first string
while(string[i]!=NULL) //parce others
{
printf("string [%d]=%s\n",i,string[i]);
i++;
string[i]=strtok(NULL," ");
}
1 Answer
A simple example that shows how to use multiple delimiters and potential improvements in your code. See embedded comments for explanation.
Be warned about the general shortcomings of strtok() (from manual):
These functions modify their first argument.
These functions cannot be used on constant strings.
The identity of the delimiting byte is lost.
The
strtok()function uses a static buffer while parsing, so it's not thread safe. Usestrtok_r()if this matters to you.
#include <stdio.h>
#include<string.h>
int main(void)
{
char input[1024];
char *string[256]; // 1) 3 is dangerously small,256 can hold a while;-)
// You may want to dynamically allocate the pointers
// in a general, robust case.
char delimit[]=" \t\r\n\v\f"; // 2) POSIX whitespace characters
int i = 0, j = 0;
if(fgets(input, sizeof input, stdin)) // 3) fgets() returns NULL on error.
// 4) Better practice to use sizeof
// input rather hard-coding size
{
string[i]=strtok(input,delimit); // 5) Make use of i to be explicit
while(string[i]!=NULL)
{
printf("string [%d]=%s\n",i,string[i]);
i++;
string[i]=strtok(NULL,delimit);
}
for (j=0;j<i;j++)
printf("%s", string[i]);
}
return 0;
}
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