Parsing a CSV file in C

Question

I have the following code below:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(void)
{
    int lendata;
    printf("Content-type:text/html\n\n");
    printf("<html><body>");
    lendata = atoi(getenv("CONTENT_LENGTH"));
    char *buf = malloc(lendata+1);
    int i=0;
    char *data;
    while((data=fgets(buf,lendata+1,stdin)) != NULL){
        char *lines[i];     
        lines[i] = strdup(data);
        printf("%s<br>",lines[i]);      
        i++;

}
    printf("%d, %d",lendata,i); 
    free(buf);
    printf("</body></html>");
    return 0;

}

I am trying to parse a *.csv file with different data types inside (i.e. character strings, intger ). How can I process each line in the file? Thanks!

strdup() allocates a new string each time. You'd have to free those eventually. — Jiminion
– Jiminion, Commented Aug 16, 2013 at 3:15

Jiminion · Accepted Answer · 2013-08-16 03:57:10Z

1

Maybe this will be better....

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(void)
{
    int lendata;
    printf("Content-type:text/html\n\n");
    printf("<html><body>");
    lendata = atoi(getenv("CONTENT_LENGTH"));
    char *buf = malloc(lendata+1);
    int i=0;
    char *data;
    while((data=fgets(buf,lendata+1,stdin)) != NULL){
          /*char *lines[i]; */       
          /* lines[i] = strdup(data); */  
          printf("%s<br>",data);        
          i++;  
    }
    printf("%d, %d",lendata,i); 
    free(buf);
    printf("</body></html>");
    return 0;

}

sscanf call returns number of entries that were matched.

numentries = sscanf(line,"%s,%s,%s,%s,%s",ent1,ent2,ent3,ent4,ent5);

edited Aug 16, 2013 at 3:57

answered Aug 16, 2013 at 3:12

Jiminion

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6 Comments

user2672367 Over a year ago

How can I then parse the content of the file?

user2672367 Over a year ago

Can I use sscanf to since the data inside the file are not numbers or integers?

Jiminion Over a year ago

Yes. Just be careful of spaces, if there are any. You might have to account fro them in the sscanf format.

WhozCraig Over a year ago

@JKTA Everything you need to know about sscanf() for this (and frankly the rest of the C standard library) can be found at this link.

Jiminion Over a year ago

@JKTA sscanf(line,"%s, %s,%s"); /* space after first comma, no space after second */

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