rewind - cppreference.com (original) (raw)
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.
[edit] Parameters
| stream | - | file stream to modify |
|---|
[edit] Return value
(none)
[edit] Example
This example shows how to read a file twice
#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:
[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