UNIX for Advanced & Expert Users

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/statvfs.h>
extern int errno;

int disp(const char *path)
{
    struct statvfs st;
    int retval=statvfs(path, &st);

    if(!retval)
        fprintf(stdout,"%s %u\n", st.f_fstr, st.f_bsize);
    else
    {
        fprintf(stderr, "%s %s\n", path, strerror(errno));
        retval=1;
    }
    return retval;
}


int main(int argc, char **argv)
{
    int i=0;
    char path[512]={0x0};
    int retval=0;

    if(argc==1)
        while(fgets(path, sizeof(path), stdin)!=NULL)       
            retval|=disp(path);
    else
        for(i=1; i<argc; i++)        
            retval|=disp(argv[i]);
        
    return retval;
}