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Restores the current position in the stream to pos.
The internal file position indicator associated with stream is set to the position represented by pos, which is a pointer to an fpos_t object whose value shall have been previously obtained by a call to fgetpos.
The end-of-file internal indicator of the stream is cleared after a successful call to this function, and all effects from previous calls to ungetc on this stream are dropped.
On streams open for update (read+write), a call to fsetpos allows to switch between reading and writing.
A similar function, fseek, can be used to set arbitrary positions on streams open in binary mode.
On failure, a non-zero value is returned and errno is set to a system-specific positive value.
After this code is successfully executed, a file called myfile.txt will contain:
Reference
C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
-
<cfenv> (fenv.h)C++11
- <cfloat> (float.h)
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<cinttypes> (inttypes.h)C++11
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
-
<cstdbool> (stdbool.h)C++11
- <cstddef> (stddef.h)
-
<cstdint> (stdint.h)C++11
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
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<ctgmath> (tgmath.h)C++11
- <ctime> (time.h)
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<cuchar> (uchar.h)C++11
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
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<array>C++11
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<forward_list>C++11
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<unordered_set>C++11
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Input/Output:
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Other:
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<chrono>C++11
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<initializer_list>C++11
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<random>C++11
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<ratio>C++11
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<system_error>C++11
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<type_traits>C++11
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<typeindex>C++11
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<cstdio> (stdio.h)
functions
- clearerr
- fclose
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- fflush
- fgetc
- fgetpos
- fgets
- fopen
- fprintf
- fputc
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- fread
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- fseek
- fsetpos
- ftell
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snprintfC++11
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vfscanfC++11
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vscanfC++11
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vsnprintfC++11
- vsprintf
-
vsscanfC++11
objects
types
macro constants
function
<cstdio>
fsetpos
int fsetpos ( FILE * stream, const fpos_t * pos );
Set position indicator of stream
The internal file position indicator associated with stream is set to the position represented by pos, which is a pointer to an fpos_t object whose value shall have been previously obtained by a call to fgetpos.
The end-of-file internal indicator of the stream is cleared after a successful call to this function, and all effects from previous calls to ungetc on this stream are dropped.
On streams open for update (read+write), a call to fsetpos allows to switch between reading and writing.
A similar function, fseek, can be used to set arbitrary positions on streams open in binary mode.
Parameters
Return Value
If successful, the function returns zero.On failure, a non-zero value is returned and errno is set to a system-specific positive value.
Example
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After this code is successfully executed, a file called myfile.txt will contain:
This is a sample |
See also
- fgetpos
- Get current position in stream (function)
- fseek
- Reposition stream position indicator (function)
- rewind
- Set position of stream to the beginning (function)
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