NAME

std::rewind - std::rewind

Synopsis

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.

Parameters

stream - file stream to modify

Return value

(none)

Example

// Run this code

#include <cstdio>

int main()
{
std::FILE *f;
char ch;
char str[20];

f = std::fopen("file.txt", "w");
for (ch = '0'; ch <= '9'; ch++) {
std::fputc(ch, f);
}
std::fclose(f);

std::FILE* f2 = std::fopen("file.txt", "r");
unsigned int size = std::fread(str, 1, 10, f2);
std::puts(str);
std::printf("\n%u\n",size);

std::rewind(f2);
unsigned int size2 = std::fread(str, 1, 10, f2);
std::puts(str);
std::printf("\n%u",size2);
std::fclose(f2);
}

See also

fseek moves the file position indicator to a specific location in a file
(function)