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> int main(void) { FILE* fp = fopen("test.txt", "r"); if(!fp) { perror("File opening failed"); return EXIT_FAILURE; } int c; // note: int, not char, required to handle EOF while ((c = fgetc(fp)) != EOF) { // standard C I/O file reading loop putchar(c); } if (ferror(fp)) puts("I/O error when reading"); else if (feof(fp)) puts("End of file reached successfully"); fclose(fp); }
[edit] References
- C11 standard (ISO/IEC 9899:2011):
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- 7.21.10.3 The ferror function (p: 339)
- C99 standard (ISO/IEC 9899:1999):
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- 7.19.10.3 The ferror function (p: 305)
- C89/C90 standard (ISO/IEC 9899:1990):
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- 4.9.10.3 The ferror function
[edit] See also
| clears errors (function) |
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| checks for the end-of-file (function) |
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| displays a character string corresponding of the current error to stderr (function) |
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C++ documentation for ferror
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