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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/algorithm/../io/ferror.html below:

ferror - cppreference.com

Checks the given stream for errors.

Nonzero value if the file stream has errors occurred, ​0​ otherwise

#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <wchar.h>
 
int main(void)
{
    char* fname = tmpnam(NULL);
    FILE* f = fopen(fname, "wb");
    fputs("\xff\xff\n", f); // not a valid UTF-8 character sequence
    fclose(f);
 
    setlocale(LC_ALL, "en_US.utf8");
    f = fopen(fname, "rb");
    wint_t ch;
    while ((ch=fgetwc(f)) != WEOF) // attempt to read as UTF-8 fails
          printf("%#x ", ch);
 
    if (feof(f))
        puts("EOF indicator set");
    if (ferror(f))
        puts("Error indicator set");
}

Output:

• C11 standard (ISO/IEC 9899:2011):

• 7.21.10.3 The ferror function (p: 339)

• C99 standard (ISO/IEC 9899:1999):

• 7.19.10.3 The ferror function (p: 305)

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

• 4.9.10.3 The ferror function

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