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#include "stdio_impl.h" #include <limits.h> #include <errno.h> #include <stdint.h> #include <stdlib.h> #include <wchar.h> struct cookie { wchar_t *ws; size_t l; }; static size_t sw_write(FILE *f, const unsigned char *s, size_t l) { size_t l0 = l; int i = 0; struct cookie *c = f->cookie; if (s!=f->wbase && sw_write(f, f->wbase, f->wpos-f->wbase)==-1) return -1; while (c->l && l && (i=mbtowc(c->ws, (void *)s, l))>=0) { s+=i; l-=i; c->l--; c->ws++; } *c->ws = 0; if (i < 0) { f->wpos = f->wbase = f->wend = 0; f->flags |= F_ERR; return i; } f->wend = f->buf + f->buf_size; f->wpos = f->wbase = f->buf; return l0; } int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap) { int r; unsigned char buf[256]; struct cookie c = { s, n-1 }; FILE f = { .lbf = EOF, .write = sw_write, .lock = -1, .buf = buf, .buf_size = sizeof buf, .cookie = &c, }; if (!n) { return -1; } else if (n > INT_MAX) { errno = EOVERFLOW; return -1; } r = vfwprintf(&f, fmt, ap); sw_write(&f, 0, 0); return r>=n ? -1 : r; } |