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std::rewind

From cppreference.com
< cpp‎ | io‎ | c
 
 
 
C-style I/O
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(C++11)(C++11)(C++11)    
(C++11)(C++11)(C++11)    
 
Defined in header <cstdio>
void rewind( std::FILE* stream );

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

The function is equivalent to std::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

#include <array>
#include <cstdio>
 
int main()
{
    std::FILE* f = std::fopen("file.txt", "w");
    for (char ch = '0'; ch <= '9'; ch++)
        std::fputc(ch, f);
    std::fclose(f);
 
    std::array<char, 20> str;
    std::FILE* f2 = std::fopen("file.txt", "r");
 
    const unsigned size1 = std::fread(str.data(), 1, str.size(), f2);
    std::puts(str.data());
    std::printf("size1 = %u\n", size1);
 
    std::rewind(f2);
 
    const unsigned size2 = std::fread(str.data(), 1, str.size(), f2);
    std::puts(str.data());
    std::printf("size2 = %u", size2);
 
    std::fclose(f2);
}

Output:

0123456789
size1 = 10
0123456789
size2 = 10

[edit] See also

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