ferror
From cppreference.com
| Defined in header <stdio.h>
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| int ferror( FILE *stream ); |
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Checks the given stream for errors.
Contents |
[edit] Parameters
| stream | - | the file stream to check |
[edit] Return value
Nonzero value if the file stream has errors occurred, 0 otherwise
[edit] Example
Run this code
#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:
Error indicator set
[edit] References
- 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
[edit] See also
| clears errors (function) | |
| checks for the end-of-file (function) | |
| C++ documentation for ferror
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