I was reading the manual page for the getline function and saw a demonstration of it :
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
int
main(int argc, char *argv[])
{
FILE *stream;
char *line = NULL;
size_t len = 0;
ssize_t nread;
...
while ((nread = getline(&line, &len, stream)) != -1) {
printf("Retrieved line of length %zu:\n", nread);
fwrite(line, nread, 1, stdout); /* ? */
}
free(line);
fclose(stream);
exit(EXIT_SUCCESS);
}
I replaced the fwrite() statement with printf ("%s", line) and it produced identical results (compared using cmp and diff). I am aware of the distinction between fwrite and fprint but was there any specifc reason the author chose to use fwrite() over fprintf or printf in this context ?
Difference between fwrite(line, nread, 1, stdout) and printf ("%s", line) includes:
printf ("%s", line) writes up to the 1st null character.
fwrite(line, nread, 1, stdout) writes to length of input.
This differs when a null character was read and so using fwrite() provides correct functionality in that pathological case.
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