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11fb383275
this was a POSIX requirement that was always in conflict with ISO C, which specified a well-defined behavior for snprintf and swprintf so long as the actual number of bytes/characters produced did not exceed INT_MAX. I originally raised this conflict for snprintf with the Austin Group as tracker issue 761, which was never resolved. it was later reported again as issue 1219, and as a result the conflicting requirement has been removed. the corresponding issue with swprintf does not seem to have been addressed, but as the same reasoning applies to it, I am removing the limitation on n for swprintf as well.
58 lines
1 KiB
C
58 lines
1 KiB
C
#include "stdio_impl.h"
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#include <limits.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.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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if (!i) i=1;
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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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if (i < 0) {
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f->wpos = f->wbase = f->wend = 0;
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f->flags |= F_ERR;
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return i;
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}
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f->wend = f->buf + f->buf_size;
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f->wpos = f->wbase = f->buf;
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return 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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unsigned char buf[256];
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struct cookie c = { s, n-1 };
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FILE f = {
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.lbf = EOF,
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.write = sw_write,
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.lock = -1,
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.buf = buf,
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.buf_size = sizeof buf,
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.cookie = &c,
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};
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if (!n) {
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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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