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#include "stdio_impl.h" #include <limits.h> #include <string.h> #include <errno.h> #include <stdint.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; return i<0 ? i : l0; } int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap) { int r; FILE f; unsigned char buf[256]; struct cookie c = { s, n-1 }; memset(&f, 0, sizeof(FILE)); f.lbf = EOF; f.write = sw_write; f.buf_size = sizeof buf; f.buf = buf; f.lock = -1; f.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; } |