CODEWITHSUNDEEP
carraysfgetsio-redirection
user3251142
user3251142

Reputation: 175

STDIN redirection: how to make program end once fgets() reads an expected ending line

Ok, so I have a program that reads lines of a file. However once it reaches the line
*** END ***
it's meant to see that
char str[100];
while(fgets(str,100,stdin) != NULL && strcmp(str,"*** END ***"))
and the while loop should stop because strcmp will be equal to 0 therefore making the while loop false.

However it doesn't. I think this is because str has a different amount of chars (I'm assuming the rest after the copied line have nothing inside of them?) than "*** END ***". How can I fix my program so that it will end once the line is read? Thanks.

OK, so I know now it's because in my example text, I had a line after that one. Once deleted it works fine. But how can I make it end whether there's a line after it or not?

Upvotes: 0

Views: 313

Answers (2)

user3365834
user3365834

Reputation:

you can use

char * strstr ( const char *, const char * )

A pointer to the first occurrence in str1 of the entire sequence of characters specified in str2, or a null pointer if the sequence is not present in str1.

Upvotes: 1

Buddhima Gamlath
Buddhima Gamlath

Reputation: 2328

I think your input terminates with an end of line (\n) character. fgets include that also in the string.

Try strcmp(str,"*** END ***\n") instead.

Upvotes: 0

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