clearerr

void clearerr( FILE *stream );

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

Parameters

Return value

(none).

Example

#include <stdio.h>
#include <assert.h>
 
int main(void)
{
    FILE* tmpf = tmpfile();
    fputs("cppreference.com\n", tmpf);
    rewind(tmpf);
 
    for (int ch; (ch = fgetc(tmpf)) != EOF; putchar(ch)) { }
 
    assert(feof(tmpf)); // the loop is expected to terminate by EOF
    puts("End of file reached");
 
    clearerr(tmpf); // clear EOF
 
    puts(feof(tmpf) ? "EOF indicator set" 
                    : "EOF indicator cleared");
}

cppreference.com
End of file reached
EOF indicator cleared

References

• C17 standard (ISO/IEC 9899:2018):
• 7.21.10.1 The clearerr function (p: 246)
• 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