mirror of
https://github.com/fluencelabs/musl
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835f9f950e
this header evolved to facilitate the extremely lazy practice of omitting explicit includes of the necessary headers in individual stdio source files; not only was this sloppy, but it also increased build time. now, stdio_impl.h is only including the headers it needs for its own use; any further headers needed by source files are included directly where needed.
54 lines
970 B
C
54 lines
970 B
C
#include "stdio_impl.h"
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#include <limits.h>
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#include <string.h>
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#include <errno.h>
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#include <stdint.h>
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#include <wchar.h>
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struct cookie {
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wchar_t *ws;
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size_t l;
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};
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static size_t sw_write(FILE *f, const unsigned char *s, size_t l)
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{
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size_t l0 = l;
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int i = 0;
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struct cookie *c = f->cookie;
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if (s!=f->wbase && sw_write(f, f->wbase, f->wpos-f->wbase)==-1)
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return -1;
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while (c->l && l && (i=mbtowc(c->ws, (void *)s, l))>=0) {
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s+=i;
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l-=i;
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c->l--;
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c->ws++;
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}
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*c->ws = 0;
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return i<0 ? i : l0;
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}
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int vswprintf(wchar_t *restrict s, size_t n, const wchar_t *restrict fmt, va_list ap)
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{
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int r;
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FILE f;
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unsigned char buf[256];
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struct cookie c = { s, n-1 };
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memset(&f, 0, sizeof(FILE));
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f.lbf = EOF;
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f.write = sw_write;
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f.buf_size = sizeof buf;
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f.buf = buf;
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f.lock = -1;
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f.cookie = &c;
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if (!n) {
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return -1;
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} else if (n > INT_MAX) {
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errno = EOVERFLOW;
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return -1;
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}
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r = vfwprintf(&f, fmt, ap);
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sw_write(&f, 0, 0);
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return r>=n ? -1 : r;
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}
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