How to print the first word of each line with comma separation plus give me an option to select those words one by one when printing

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define STRING_LEN 200

int main(){
  char string[STRING_LEN], data[STRING_LEN];
  FILE * fp1 = fopen("file.csv", "r");
  
  while(fgets(string, STRING_LEN, fp1)){
    // strtok(string, ",");
    sscanf(string, "%s", data);
    printf("%s\n", data);
  }
  
  return 0;
}

What I have tried:

In this code, I am trying to get the first word of each line with the difference of comma because it's a CSV file and the name contains two words. But sscanf is separating words with the difference of space. So I'm not able to get the last name. I can use strtok to separate but I also want to print the data one by one like data[0], data[1] later on which is not possible with strtok.

Posted 11-Oct-20 2:22am

ibilalkayy

Updated 11-Oct-20 5:34am

v2

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Richard MacCutchan · Answer 1 · 2020-10-11T02:54:00

Solution 1

The strtok function will do what you want if you actually capture each field as you tokenise it. If you know there are exactly two fields per line then:

C++

char* data[2];
data[0] = strtok(line, " ,");
data[1] = strtok(NULL, " ,");

Posted 11-Oct-20 2:54am

Richard MacCutchan

Rick York · Answer 2 · 2020-10-11T05:34:00

Richard is on the right track. I use a function to do this kind of thing that wraps strtok in a loop and saves a pointer to each token found in an array. It is not perfect for dealing with CSV files because it does not handle commas embedded in a quoted string correctly. Here's what it looks like :

C++

int ParseTokens( char * buffer, const char * delims, char * tokens[], int maxTokens )
{
    char * cptr = nullptr;
    char * pbuffer = buffer;
    int tokenCount = 0;
    int x;
    for( x = 0; x < maxTokens; x += 1 )
    {
        cptr = strtok( pbuffer, delims );
        if( ! cptr )
            break;

        tokens[ tokenCount ] = cptr;
        ++tokenCount;
        pbuffer = nullptr;
    }
    return tokenCount;
}

To call it you can do this :

C++

#define MAX_TOKENS 16
    char * tokens[ MAX_TOKENS ] = { nullptr };
    const char * delimiters = ",";
    int tokenCount = ParseTokens( string, delimiters, tokens, MAX_TOKENS );