rewind

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.

Parameters

stream

-

file stream to modify

Return value

(none)

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

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

Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Date and time utilities
Strings library
Algorithms
Numerics
Input/output support
Localization support
Atomic operations (C11)
Thread support (C11)
Technical Specifications

rewind

Parameters

Return value

Example

References

See also