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Declaration:
int setvbuf(FILE *stream,
char *buffer, int
mode, size_t size);
Defines how a stream should be buffered. This should be called
after the stream has been opened but before any operation has
been done on the stream. The argument mode defines how
the stream should be buffered as follows:
_IOFBF |
Input and output is fully buffered. If the buffer is
empty, an input operation attempts to fill the buffer.
On output the buffer will be completely filled before
any information is written to the file (or the stream is
closed). |
_IOLBF |
Input and output is line buffered. If the buffer is
empty, an input operation attempts to fill the buffer.
On output the buffer will be flushed whenever a newline
character is written. |
_IONBF |
Input and output is not buffered. No buffering is
performed. |
The argument buffer points to an array to be used as
the buffer. If buffer is a null pointer, then
setvbuf uses malloc to create its
own buffer.
The argument size determines the size of the array.
On success zero is returned. On error a nonzero value is
returned.
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