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Unified Diff: fusl/src/stdlib/wcstod.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/stdlib/wcstod.c
diff --git a/fusl/src/stdlib/wcstod.c b/fusl/src/stdlib/wcstod.c
new file mode 100644
index 0000000000000000000000000000000000000000..26fe9af8b4cc7d7c5f69fbab349d1bb1735f18f8
--- /dev/null
+++ b/fusl/src/stdlib/wcstod.c
@@ -0,0 +1,65 @@
+#include "shgetc.h"
+#include "floatscan.h"
+#include "stdio_impl.h"
+#include <wchar.h>
+#include <wctype.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, prec, 1);
+ if (p) {
+ size_t cnt = shcnt(&f);
+ *p = cnt ? t + cnt : (wchar_t *)s;
+ }
+ return y;
+}
+
+float wcstof(const wchar_t *restrict s, wchar_t **restrict p)
+{
+ return wcstox(s, p, 0);
+}
+
+double wcstod(const wchar_t *restrict s, wchar_t **restrict p)
+{
+ return wcstox(s, p, 1);
+}
+
+long double wcstold(const wchar_t *restrict s, wchar_t **restrict p)
+{
+ return wcstox(s, p, 2);
+}
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