c:stdio.h:setvbuf
Differences
This shows you the differences between two versions of the page.
| — |
c:stdio.h:setvbuf [2024/02/16 01:05] (current) |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | {{keywords>wiki library source code example reference}} | ||
| + | ====== setvbuf ====== | ||
| + | <code c> | ||
| + | int setvbuf(FILE *stream, char *buffer, int mode, size_t size); | ||
| + | </code> | ||
| + | Controls buffering for stream stream. mode is _IOFBF for full buffering, _IOLBF for line buffering, _IONBF for no buffering. Non-null buf specifies buffer of size size to be used; otherwise, a buffer is allocated. Returns non-zero on error. Call must be before any other operation on stream. | ||
| + | <code c> | ||
| + | _IOLBF File will buffered line by line | ||
| + | _IONBF Input/Output will not be buffered | ||
| + | _IOFBF Input/Output will fully buffered | ||
| + | </code> | ||
| + | |||
| + | ===== C Sourcecode Example ===== | ||
| + | <code c> | ||
| + | /* | ||
| + | * setvbuf example code | ||
| + | * http://code-reference.com/c/stdio.h/setvbuf | ||
| + | */ | ||
| + | |||
| + | #include <stdio.h> /* including standard library */ | ||
| + | //#include <windows.h> /* uncomment this for Windows */ | ||
| + | |||
| + | |||
| + | int main ( void ) | ||
| + | { | ||
| + | FILE *stream_not_buffered, *stream_full_buffered, *stream_line_buffered; | ||
| + | stream_full_buffered=fopen ("test.txt","w"); | ||
| + | stream_not_buffered=fopen("test2.txt","w"); | ||
| + | stream_line_buffered=fopen("test3.txt","w"); | ||
| + | |||
| + | /* case 1 full buffered */ | ||
| + | setvbuf ( stream_full_buffered , NULL , _IOFBF , 2000L ); | ||
| + | |||
| + | fputs("Buffered input for setvbuf full buffered", stream_full_buffered); | ||
| + | fflush(stream_full_buffered); | ||
| + | fclose(stream_full_buffered); | ||
| + | |||
| + | |||
| + | /* case 2 not buffered */ | ||
| + | setvbuf ( stream_not_buffered , NULL , _IONBF , BUFSIZ ); | ||
| + | |||
| + | fputs("input for setvbuf not buffered", stream_not_buffered); | ||
| + | fflush(stream_not_buffered); | ||
| + | fclose(stream_not_buffered); | ||
| + | |||
| + | |||
| + | /* case 3 line buffered */ | ||
| + | setvbuf ( stream_line_buffered , NULL , _IOLBF , 80 ); | ||
| + | |||
| + | fputs("Buffered input for setvbuf line buffered", stream_line_buffered); | ||
| + | fflush(stream_line_buffered); | ||
| + | fclose(stream_line_buffered); | ||
| + | |||
| + | |||
| + | return 0; | ||
| + | } | ||
| + | |||
| + | </code> | ||
| + | |||
| + | |||
| + | output: ./setvbuf | ||
| + | |||
| + | ==== content of test.txt === | ||
| + | <code c> | ||
| + | Buffered input for setvbuf full buffered | ||
| + | </code> | ||
| + | ==== content of test2.txt === | ||
| + | <code c> | ||
| + | input for setvbuf not buffered | ||
| + | </code> | ||
| + | ==== content of test3.txt === | ||
| + | <code c> | ||
| + | Buffered input for setvbuf line buffered | ||
| + | </code> | ||
| + | |||
| + | |||
| + | see also [[c:stdio.h:setbuf|]] | ||
on the occasion of the current invasion of Russia in Ukraine
c/stdio.h/setvbuf.txt · Last modified: 2024/02/16 01:05 (external edit)
Page Tools
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 3.0 Unported
