clearerr

clearerr

Defined in header <stdio.h>
void clearerr( FILE *stream );

Resets the error flags and the EOF indicator for the given file stream.

Parameters

stream

-

the file to reset the error flags for

Return value

(none).

Example

#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
 
int main(void)
{
    FILE* tmpf = tmpfile();
    fputs("abcde\n", tmpf);
    rewind(tmpf);
    int ch;
    while ((ch=fgetc(tmpf)) != EOF)
          printf("%c", ch);
    assert(feof(tmpf)); // the loop is expected to terminate by eof
    puts("End of file reached");
 
    clearerr(tmpf);  // clear eof
 
    if (feof(tmpf))
        puts("EOF indicator set");
    else
        puts("EOF indicator cleared\n");
}

Output:

abcde
End of file reached
EOF indicator cleared

References

C11 standard (ISO/IEC 9899:2011):

• 7.21.10.1 The clearerr function (p: 338)

C99 standard (ISO/IEC 9899:1999):

• 7.19.10.1 The clearerr function (p: 304)

C89/C90 standard (ISO/IEC 9899:1990):

• 4.9.10.1 The clearerr function

See also

feof	checks for the end-of-file (function)
perror	displays a character string corresponding of the current error to stderr (function)
ferror	checks for a file error (function)

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