implement wcstod and family

not heavily tested but these functions appear to work correctly

diff --git a/src/stdlib/wcstod.c b/src/stdlib/wcstod.c
new file mode 100644 (file)
index 0000000..338c616
--- /dev/null
+++ b/src/stdlib/wcstod.c
@@ -0,0 +1,61 @@
+#include "shgetc.h"
+#include "floatscan.h"
+#include "stdio_impl.h"
+
+/* This read function heavily cheats. It knows:
+ *  (1) len will always be 1
+ *  (2) non-ascii characters don't matter */
+
+static size_t do_read(FILE *f, unsigned char *buf, size_t len)
+{
+       size_t i;
+       const wchar_t *wcs = f->cookie;
+
+       if (!wcs[0]) wcs=L"@";
+       for (i=0; i<f->buf_size && wcs[i]; i++)
+               f->buf[i] = wcs[i] < 128 ? wcs[i] : '@';
+       f->rpos = f->buf;
+       f->rend = f->buf + i;
+       f->cookie = (void *)(wcs+i);
+
+       if (i && len) {
+               *buf = *f->rpos++;
+               return 1;
+       }
+       return 0;
+}
+
+static long double wcstox(const wchar_t *s, wchar_t **p, int prec)
+{
+       wchar_t *t = (wchar_t *)s;
+       unsigned char buf[64];
+       FILE f = {0};
+       f.flags = 0;
+       f.rpos = f.rend = 0;
+       f.buf = buf + 4;
+       f.buf_size = sizeof buf - 4;
+       f.lock = -1;
+       f.read = do_read;
+       while (iswspace(*t)) t++;
+       f.cookie = (void *)t;
+       shlim(&f, 0);
+       long double y = __floatscan(&f, -1, prec, 1);
+       off_t cnt = shcnt(&f);
+       if (p) *p = cnt ? t + cnt : (wchar_t *)s;
+       return y;
+}
+
+float wcstof(const wchar_t *s, wchar_t **p)
+{
+       return wcstox(s, p, 0);
+}
+
+double wcstod(const wchar_t *s, wchar_t **p)
+{
+       return wcstox(s, p, 1);
+}
+
+long double wcstold(const wchar_t *s, wchar_t **p)
+{
+       return wcstox(s, p, 2);
+}