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Register Remember Me? Join them; it only takes a minute: Sign up Little trouble with fgets and error handling up vote 3 down vote favorite i have recently started to learn C and have dagH 05-14-2007 #2 MacGyver View Profile View Forum Posts Deathray Engineer Join Date Mar 2007 Posts 3,211 Something more like this: Code: while(fgets(buf, 200, fp) != NULL) { printf("%s",buf); } /* The time now is 11:05 AM.

Pronuncia strana della "s" dopo una "r": un fenomeno romano o di tutta l'Italia? Good Term For "Mild" Error (Software) Any better way to determine source of light by analyzing the electromagnectic spectrum of the light more hot questions question feed lang-c about us tour Just pass perror() a string to print before the error. Permalink Jul 25, 2008 Geoff Clare Thanks for the pointer.

Replace lines matching a pattern with lines from another file in order need book id, written before 1996, it's about a teleport company that sends students learning to become colonists to My immediate reaction was "surely ROSE would flag all uses of gets() as unsafe". Declaration Following is the declaration for fgets() function. Risk Management in Single engined piston aircraft flight Appease Your Google Overlords: Draw the "G" Logo Is there a place in academia for someone who compulsively solves every problem on their

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed If a null character is read by fgets, it will be stored in the string along with the rest of the characters read. The gets() function is shown as the NCE. Browse other questions tagged c fgets or ask your own question.

If you're posting code, use code tags: [code] /* insert code here */ [/code] Quick Navigation C Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Isn't that more expensive than an elevated system? always on the run. always on the run.

stream -- This is the pointer to a FILE object that identifies the stream where characters are read from. When all else fails, read the instructions. You may need to see ferror return value to be sure about it. I actually implemented fgets() in my own C library. ;-) Two nasty habits of mine: One, I answer SO questions while the compiler is running, i.e.

This volume of IEEEStd1003.1-2001 defers to the ISOC standard. If no errors occur, writes a null character at the position immediately after the last character written to str. What's the most recent specific historical element that is common between Star Trek and the real world? Is it appropriate to tell my coworker my mom passed away?

Why is it a bad idea for management to have constant access to every employee's inbox? If end-of-file is encountered and no characters have been read into the array, the contents of the array remain unchanged and a null pointer is returned.The wide-character function fgetws() has the same Don't use fgets unless you know the data cannot contain a null. I took it out of the ROSE paragraph.

Gwyn On POSIX systems it is also easy to input a null byte (and some other "binary" codes) from the keyboard, usually as ctrl-SPACE or [email protected] How do computers remember where they store things? Although the standard specification is ambiguous in the case where count==1, common implementations read no characters, store zero in str[0], and report success (return str) [edit] Example Run this code #include Please note fgets() will automatically append a null character (\0) to the end of the string, which may cause the string to be truncated, since you specify how many characters must

It will create a text file containing the string Hidee ho! I actually implemented fgets() in my own C library. ;-) Two nasty habits of mine: One, I answer SO questions while the compiler is running, i.e. Powered by vBulletin Version 4.2.3 Copyright © 2016 vBulletin Solutions, Inc. I haven't used ferror before so...

If an error occurs, a null pointer is returned. When all else fails, read the instructions. Powered by vBulletin Version 4.2.3 Copyright © 2016 vBulletin Solutions, Inc. And strings need a '\0', so now consider unsigned int length = 20+1+1; –chux Mar 12 '14 at 0:40 add a comment| 2 Answers 2 active oldest votes up vote 2

If there is no error, fgets returns the string read as a return value, which may be discarded. Thank you for any help. This may occur, for example, if a binary data file is read by the fgets() call [Lai 2006]. Get Started with C or C++ C Tutorial C++ Tutorial Get the C++ Book All Tutorials Advanced Search Forum General Programming Boards C Programming Check for EOF when using fgets Getting

If a read error occurs, the error indicator (ferror) is set and a null pointer is also returned (but the contents pointed by str may have changed). APPLICATION USAGE None. If a read error occurs, the error indicator for the stream shall be set, fgets() shall return a null pointer, [CX] and shall set errno to indicate the error. If a read error occurs, the error indicator (ferror) is set and a null pointer is also returned (but the contents pointed by str may have changed).

Try man fgets -- on the command line in a Unix-ish environment, or if in a pinch, in a web search engine. ;) share|improve this answer edited Mar 11 '14 at The time now is 11:05 AM. At least, not one I could find. It stops when either (n-1) characters are read, the newline character is read, or the end-of-file is reached, whichever comes first.

Input Output (FIO) Skip to end of banner JIRA links Go to start of banner FIO37-C. There's nothing wrong with using them unless you have a specific reason not to. A newline character makes fgets stop reading, but it is considered a valid character by the function and included in the string copied to str. Do not assume that fgets() or fgetws() returns a nonempty string when successful Skip to end of metadata Created by Chad Dougherty, last modified by Sandy Shrum on Jul 28, 2016