getc() crashes when trying to read after the last \n in a file

Asked Dec 25 '18 at 19:07

Active Dec 25 '18 at 19:23

Viewed 83 times

I have a an issue where fgetc() would crash upon trying to read beyond the last character in a stream (there is no file being opened, I am redirecting a text file to stdin). In the following code, with a file that contains a single character and a newline, it does not get to the "something" at the end - it does not even return EOF, merely quits.

I am somewhat at my wits' end here, really not sure what I am doing wrong. It's probably me not knowing something critical, but I have no idea what it is.

I did try to check with feof(), but it did not even get to it.

int p;
while ( (p = fgetc(stdin)) != EOF ) {
    printf("%c", p);
}
printf("something.\n");

I tried changing the previous char p to int p, to no avail.

edited Dec 25 '18 at 19:23

asked Dec 25 '18 at 19:07

Sunspawn

1

`int p;` instead of `char p;` – wildplasser Dec 25 '18 at 19:10
1

`fgetc()` returns `int` and not `char`. – H.S. Dec 25 '18 at 19:10
Is that really it? Gonna check real quick, feeling mighty dumb right now. – Sunspawn Dec 25 '18 at 19:15
Nope, still not getting to the last line. – Sunspawn Dec 25 '18 at 19:17
1

The exact code in the (edited) question works fine when copypasted inside `int main() { … }` and the input is piped from `echo x`. – Arkku Dec 25 '18 at 19:22
Strange, I am getting crashes there when using the feature of eclipse that replaces console input with a text file. – Sunspawn Dec 25 '18 at 19:25
2

Try directly from the command-line. – Arkku Dec 25 '18 at 19:27
Okay, it works. Seems the issue is with the eclipse side. Thanks a ton! – Sunspawn Dec 25 '18 at 19:35
Eclipse sucks. =) – Arkku Dec 25 '18 at 20:51

getc() crashes when trying to read after the last \n in a file

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