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rewind

From cppreference.com
< c‎ | io
 
 
File input/output
Types and objects
        
Functions
File access
(C95)
Unformatted input/output
(C95)(C95)
(C95)
(C95)(C95)
(C95)
(C95)
(C95)
(C95)

Formatted input
(C99)(C99)(C99)(C11)(C11)(C11)
(C99)(C99)(C99)(C11)(C11)(C11)  
Direct input/output
Formatted output
File positioning
rewind

Error handling
Operations on files
 
Defined in header <stdio.h>
void rewind( FILE *stream );

Moves the file position indicator to the beginning of the given file stream.

The function is equivalent to fseek (stream, 0, SEEK_SET );, except that end-of-file and error indicators are cleared.

The function drops any effects from previous calls to ungetc .

Contents

[edit] Parameters

stream - file stream to modify

[edit] Return value

(none)

[edit] Example

This example shows how to read a file twice

Run this code
#include <stdio.h>
 
char str[20];
 
int main(void)
{
 FILE *f;
 char ch;
 
 f = fopen ("file.txt", "w");
 for (ch = '0'; ch <= '9'; ch++) {
 fputc (ch, f);
 }
 fclose (f);
 
 f = fopen ("file.txt", "r");
 fread (str, 1, 10, f);
 puts (str);
 
 rewind(f);
 fread (str, 1, 10, f);
 puts (str);
 fclose (f);
 
 return 0;
}

Output: 

0123456789
0123456789

[edit] References

  • C11 standard (ISO/IEC 9899:2011):
  • 7.21.9.5 The rewind function (p: 338)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.19.9.5 The rewind function (p: 304)
  • C89/C90 standard (ISO/IEC 9899:1990):
  • 4.9.9.5 The rewind function

[edit] See also

moves the file position indicator to a specific location in a file
(function) [edit]
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