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Read a string of characters from a stream


#include <stdio.h>

char* fgets( char* buf, 
             size_t n, 
             FILE* fp );


A pointer to a buffer in which fgets() can store the characters that it reads.
The maximum number of characters to read.
The stream from which to read the characters.



Use the -l c option to qcc to link against this library. This library is usually included automatically.


The fgets() function reads a string of characters from the stream specified by fp, and stores them in the array specified by buf.

It stops reading characters when:

The newline character isn't discarded. A null character is placed immediately after the last character read into the array.

Note: Don't assume that there's a newline character in every string that you read with fgets(). A newline character isn't present if there are more than n-1 characters before the newline.

Also, a newline character might not appear as the last character in a file when the end-of-file is reached.


The same pointer as buf, or NULL if the stream is at the end-of-file or an error occurs (errno is set).

Note: Use feof() or ferror() to distinguish an end-of-file condition from an error.


#include <stdio.h>
#include <stdlib.h>

int main( void )
    FILE *fp;
    char buffer[80];

    fp = fopen( "file", "r" );
    if( fp != NULL ) {
        while( fgets( buffer, 80, fp ) != NULL ) {
            fputs( buffer, stdout );
        fclose( fp );
        return EXIT_SUCCESS;
    return EXIT_FAILURE;


ANSI, POSIX 1003.1

Cancellation point Yes
Interrupt handler No
Signal handler No
Thread Yes

See also:

errno, feof(), ferror(), fopen(), fputs(), getc(), gets(), fgetc()