Splitting string using delimiter in c [closed] - c

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My input string is 1,2,3:4,5,6:7,5,8
First I need to split 1, 2, 3 set wit : delimiter. Then again I need to split 1 2 3 with , delimiter. So I need to do outer split and inner split till the end of input string.. Please explain me with some example

Answer 1

As coderredoc says, strtok is the function you need.
#include <string.h>
char *strtok(char *str, const char *delim);
But strtok have some
quirks you have to remember:
Only in the first call you have to pass the source (str), subsequent
calls of strtok must be passed with NULL
Strtok modifies the source. Do not use unmodifiable strings or string
literal ("this is a string literal")
Because of the previous point, you should always do a copy of the source.
Simple example
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void)
{
const char *text = "Hello:World:!";
char *tmp = strdup(text);
if(tmp == NULL)
return 1; // no more memory
char *token = strtok(tmp, ":");
if(token == NULL)
{
free(tmp);
printf("No tokens\n");
return 1;
}
printf("Token: '%s'\n", token);
while(token = strtok(NULL, ":"))
printf("Token: '%s'\n", token);
free(tmp);
return 0;
}
Expected output
Token: 'Hello'
Token: 'World'
Token: '!'
Update
If you need to nest strtok, you should use strtok_r as mentioned before.
Here is an update of my example above. If I'm not mistaken, input will have
the same format as yours (more or less, mine has different set sizes, but same principle)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(void)
{
const char *input ="v1,v2,v3,v4,v5:w1,w2,w3,w4,w5:x1,x2,x3,x4:y1,y2,y3,y4,y5,y6";
char *input_copy = strdup(input);
char *set_track, *elem_track; // keep track for strtok_r
char *set, *value;
char *_input = input_copy;
int setnum = 0;
while(set = strtok_r(_input, ":", &set_track))
{
_input = NULL; // for subsequent calls of strtok_r
printf("Set %d contains: ", ++setnum);
// in this case I don't care about strtok messing with the input
char *_set_input = set; // same trick as above
while(value = strtok_r(_set_input, ",", &elem_track))
{
_set_input = NULL; // for subsequent calls of strtok_r
printf("%s, ", value);
}
puts("");
}
free(input_copy);
return 0;
}
Expected output
Set 1 contains: v1, v2, v3, v4, v5,
Set 2 contains: w1, w2, w3, w4, w5,
Set 3 contains: x1, x2, x3, x4,
Set 4 contains: y1, y2, y3, y4, y5, y6,