fscanf in C not reading full lines?

Question

This is so stupidly simple but I\'m just having issues with it.

A text file has a header,

e.g.,

# Avizo BINARY-LITTLE-ENDIAN 2.1

define Latt         


        

Answer 1

The %s specifier in fscanf reads words, so it stops when reaching a space.

Use fgets to read a whole line.

Answer 2

Although %s may mean "string", but fscanf (as scanf) is not a greedy mathing one, you should tell it the seperator is "new line". And, You'd better to set maxinum buffer size to prevent buffer overflow.

#include <stdio.h>

#define NAME_MAX    80
#define NAME_MAX_S "80"

int main(void)
{
    static char name[NAME_MAX + 1]; // + 1 because of null
    if(scanf("%" NAME_MAX_S "[^\n]", name) != 1)
    {
        fputs("io error or premature end of line\n", stderr);
        return 1;
    }

    printf("Hello %s. Nice to meet you.\n", name);
}

Answer 3

I recommend that you use fgets, but if you insist on using fscanf:

fscanf(fd, "%[^\n]\n", buff);

This will read a full line.