Thread: loop in the same string using strtok

Hi
i am trying to write a function in C which will print a substring oout of a string in loop with a token seperator.
For example
i have a file which contains the following lines

aaaaa
bbbbb
ccccc
ddddd


i have to read each line and then copy to a variable. Once end is reached , i have to start from again

i am trying to use strtok but how to go to the starting of function and then strtok again

Below is the code snippet

Code:

#include <stdio.h>
#include<string.h>
char *result;
void new();
int main(void) {
int c=0,i,n;
FILE *fp;
char str[40000];
fp=fopen("test.txt","r");
n=fread(str,1,40000,fp);
printf("str value is <%s>\n",str);
result = strtok(str,"\n");
for(i=0;i<50;i++)
{
printf("result value is <%s>\n",result);
new();
result=strtok(NULL,"\n");
}

return(0);
}
void new()
{
char *temp;
printf("result value in function is <%s>\n",result);
strcpy(temp,result);
printf("temp value is <%s>\n",temp);

}

Any other solution will also do

Thanks
Vit

You need just a simple

Code:

rewind(fileptrName); 

to reset the file pointer back to the start of the file. That's no problem.

What I don't understand is WHAT you need to do with the data, and WHEN do you need to end this re-starting from the beginning of the file.

I gather that you know these answers. They are central to your program, of course.

Basically
i need to be continued until my process is up. Its like each time i get a request from a running process, i will create a dummy response taken from the file. The response should be in order each time.
i.e for the first request, i will send first response from the file
for the second request,second response.
if its the end of responses then for the next request, i will take the first response again.

EX: if there are 3 responses in the file

response 1
response 2
response 3

for request1 i will respond with response 1
..
request 3, i will respond with response 3
request 4 , i will respond with response 1
so on...

Well, i dint know why it dint struck me, but now i thought of something like this

Copy all the contents of file into a buffer
Split all the buffer contents whenever a new line occurs and copy into a 2 dimensional array and loop on the 2 dimensional array.. i will try to do this and see..


thanks
Vit