Parsing csv file with missing entries - c

Question

I am trying to parse a csv file with C where the separator is | using strtok. The problem is that some fields are empty and thus two separators are placed next to each other. It seems that strtok is just skipping all empty fields and just outputting the next non-empty field.
The thing is that I need to know at which position the token that is being read belongs to.
Here is a very small example to illustrate.
FILE
node|171933|||traffic_signals|||||40.4200658|-3.7016652
This line for instance has 10 fields, but only field 1,2,9 and 10 have some value in it.
CODE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void main()
{
FILE *fp;
char lineBuf[128];
char *token;
int i=0;
if((fp = fopen("test.txt", "r"))==NULL){
fprintf (stderr, "\nError when opening file\n");
return ;
}
fgets (lineBuf, sizeof(lineBuf), fp);
token=strtok(lineBuf, "|\n");
while(token!=NULL){
printf("Element %d: %s\n",i,token); i++;
token=strtok(NULL, "|\n");
}
}
OUTPUT
Element 0: node
Element 1: 171933
Element 2: traffic_signals
Element 3: 40.4200658
Element 4: -3.7016652
EXPECTED OUTPUT
Element 0: node
Element 1: 171933
Element 4: traffic_signals
Element 9: 40.4200658
Element 10: -3.7016652
Is there any other way to parse a line like this as expected? The number of elements in a line is not defined previously.
I already know that the behaviour shown by strtok is the usual behaviour I am just asking for another way of doing it to obtain the desired results, not for the explanation of why this happens.

Answer 1

I am not sure what platform you are on, but strsep() is the recommended replacement for what you are trying to do.
man strsep
while (fgets(buf, BUFSIZE, fp) != NULL) {
char *line = buf;
char *field;
int index = 0;
while ((field = strsep(&line, "|")) != NULL) {
/* note the trailing field will contain newline. */
printf("element %d = %s\n", index, field);
index++;
}
}

Answer 2

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
//non skip version strtok
char *my_strtok_r(char *str, const char *delims, char **store){
char *p, *wk;
if(str != NULL){
*store = str;
}
if(*store == NULL) return NULL;
//*store += strspn(*store, delims);//skip delimiter
if(**store == '\0') return NULL;
p=strpbrk(wk=*store, delims);
if(p != NULL){
*p='\0';
*store = p + 1;
} else {
*store = NULL;
}
return wk;
}
char *my_strtok(char *str, const char *delims){
static char *p;
return my_strtok_r(str, delims, &p);
}
int main(void){
char lineBuf[128] = "node|171933|||traffic_signals|||||40.4200658|-3.7016652\n";
char *token;
int i=0;
token=my_strtok(lineBuf, "|\n");
while(token!=NULL){
if(*token)//token != "";
printf("Element %d: %s\n",i,token);
i++;
token=my_strtok(NULL, "|\n");
}
return 0;
}