1 #include "stdio_impl.h"
2
3 /* This function makes no attempt to protect the user from his/her own
4 * stupidity. If called any time but when then ISO C standard specifically
5 * allows it, all hell can and will break loose, especially with threads!
6 *
7 * This implementation ignores all arguments except the buffering type,
8 * and uses the existing buffer allocated alongside the FILE object.
9 * In the case of stderr where the preexisting buffer is length 1, it
10 * is not possible to set line buffering or full buffering. */
11
setvbuf(FILE * restrict f,char * restrict buf,int type,size_t size)12 int setvbuf(FILE* restrict f, char* restrict buf, int type, size_t size) {
13 f->lbf = EOF;
14
15 if (type == _IONBF)
16 f->buf_size = 0;
17 else if (type == _IOLBF)
18 f->lbf = '\n';
19
20 f->flags |= F_SVB;
21
22 return 0;
23 }
24