Login or Register to Ask a Question and Join Our Community


Programming

fgets problems

 
Thread Tools Search this Thread
Top Forums Programming fgets problems
Prev   Next
# 1  
Old 02-17-2010
fgets problems
I've been having trouble with reading past the end-of-file in C. Can anyone find my stupid mistake?

This is the minimal code needed to cause the error for me:

Code:
FILE *f = fopen(name, "r");
if (!f)
	return;
pari_sp ltop = avma;
char line[1100];
while(fgets(line, 1100, f) != NULL)
	printf(".");
fclose(f);

So name is a C-string pointing to a valid filename. The FILE f opens without trouble, and the fgets loop runs through each line in the file. (The actual processing code, which I deleted, parses those lines without trouble; here I replaced it with a line which shows how many lines it reads.) But the last read through fgets does *not* return NULL but causes an application-ending error. fclose is never run.

What am I doing wrong?
 
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

while and do problems

Any ideas how to clear this error as it seems I dont understand if,do,while and els commands #!/bin/ksh set -x print "This script creates test messages" print "Please enter test case name" read testcasename echo $testcasename skipfield=Y while print "Do you want to skip this field... (4 Replies)
Discussion started by: andrew.p.mcderm
4 Replies

2. Programming

fgets read file line with "\n" inside

Hi, I have a string like this, char str ="This, a sample string.\\nThis is the second line, \\n \\n, we will have one blank line"; if I want to use strtok() to seperate the string, which token should I use? I tried "\n", "\\n", either not working. peter (1 Reply)
Discussion started by: laopi
1 Replies

3. Programming

fgets problems newline

hello, i'm trying to write a C-program that reads a file line by line. (and searches each line for a given string) This file is an special ASCII-database-file, with a lot of entries. I checked the line with most length, and it was about 4000 characters. With google i found several... (4 Replies)
Discussion started by: p1cm1n
4 Replies

4. UNIX for Dummies Questions & Answers

Problems with using less

Hello, I am having problems with using less on Linux version 2.6.18-92.1.17.el5 (brewbuilder@hs20-bc1-7.build.redhat.com) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)). I am using csh but have the same problems on bash. If I pipe something to less it works perfectly i.e. cat file | less... (9 Replies)
Discussion started by: z1dane
9 Replies

5. Programming

[C] fgets problem with SIGINT singlal!!!

Hi all, I have this method to read a string from a STDIN: void readLine(char* inputBuffer){ fgets (inputBuffer, MAX_LINE, stdin); fflush(stdin); /* remove '\n' char from string */ if(strlen(inputBuffer) != 0) inputBuffer = '\0'; } All work fine but if i... (1 Reply)
Discussion started by: hurricane86
1 Replies

6. Programming

Question about NULL Character & fgets()

Assume client send the message " Hello ", i get output such as Sent mesg: hello Bytes Sent to Client: 6 bytes_received = recv(clientSockD, data, MAX_DATA, 0); if(bytes_received) { send(clientSockD, data, bytes_received, 0); data = '\0';... (2 Replies)
Discussion started by: f.ben.isaac
2 Replies

7. Programming

Problem with fgets and rewind function ..

Hello Friends, I got stuck with fgets () & rewind() function .. Please need help.. Actually I am doing a like, The function should read lines from a txt file until the function is called.. If the data from the txt file ends then it goes to the top and then again when the function is called... (1 Reply)
Discussion started by: user_prady
1 Replies

8. Programming

fgets()

does anyone knows how to accept a command from a user.. i was wondering to use fgets(), but got no idea how to start it... (4 Replies)
Discussion started by: skanky
4 Replies

9. UNIX for Dummies Questions & Answers

Problems with ld.so.1

I renamed ld.so.1 on a Sun machine running Solaris 2.6. Now I cannot boot the system and I can use only very few commands in Maintenance Mode. Can someone help me? (3 Replies)
Discussion started by: ciccio
3 Replies

10. UNIX for Advanced & Expert Users

'make' problems (compliation problems?)

I'm trying to compile and install both most recent version of 'make' and the most recent version of 'openssh' on my Sparc20. I've run into the following problems... and I don't know what they mean. Can someone please help me resolve these issues? I'm using the 'make' version that was... (5 Replies)
Discussion started by: xyyz
5 Replies
Login or Register to Ask a Question

LEARN ABOUT MINIX

gets

GETS(3) 						     Library Functions Manual							   GETS(3)

NAME

       gets, fgets - get a string from a stream

SYNOPSIS

       #include <stdio.h>

       char *gets(char *s)
       char *fgets(char *s, int n, FILE *stream)

DESCRIPTION

       Gets  reads  a string into s from the standard input stream stdin.  The string is terminated by a newline character, which is replaced in s
       by a null character.  Gets returns its argument.

       Fgets reads n-1 characters, or up through a newline character, whichever comes first, from the stream into the string s.  The last  charac-
       ter read into s is followed by a null character.  Fgets returns its first argument.

SEE ALSO

       puts(3), getc(3), scanf(3), fread(3), ferror(3).

DIAGNOSTICS

       Gets and fgets return the constant pointer NULL upon end of file or error.

BUGS

       Gets deletes a newline, fgets keeps it, all in the name of backward compatibility.

       Gets is not present in the Minix-vmd C library for reasons that should be obvious.  Use fgets instead.

7th Edition							   May 15, 1985 							   GETS(3)