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#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdatomic.h>
int vsnprintf(char *restrict s, size_t n, const char *restrict format,
va_list ap)
{
int r;
FILE f;
if (n == 0) {
return 0;
}
if (!s) {
return -1;
}
memset(&f, 0, sizeof(f));
f.fd = -1;
f.flags = O_WRONLY;
f.type = _IONBF;
atomic_flag_clear(&f.lock);
f.buf = s;
f.buf_size = n;
f.buf_len = 0;
f.buf_pos = 0;
f.eof = 0;
f.unget_cnt = 0;
f.offset = 0;
f.next = NULL;
r = vfprintf(&f, format, ap);
if (f.buf_len < n) {
s[f.buf_len] = '\0';
} else if (n > 0) {
s[n - 1] = '\0';
r = n - 1;
}
return r;
}
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