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clearerr

From cppreference.com
< c‎ | io
 
 
File input/output


Functions
File access
Direct input/output
Unformatted input/output
(C95)(C95)
(C95)
(C95)(C95)
(C95)
(C95)
Formatted input
Formatted output
File positioning
Error handling
clearerr
Operations on files
 
Defined in header <stdio.h>
void clearerr( FILE *stream );

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

Contents

[edit] Parameters

stream - the file to reset the error flags for

[edit] Return value

(none)

[edit] 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

[edit] 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

[edit] See also

checks for the end-of-file
(function) [edit]
displays a character string corresponding of the current error to stderr
(function) [edit]
checks for a file error
(function) [edit]
C++ documentation for clearerr