rewind

From cppreference.com
< c‎ | io
 
C
 
File input/output
 
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] See also

moves the file position indicator to a specific location in a file
(function)
C++ documentation for rewind
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