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authorRich Felker <dalias@aerifal.cx>2012-04-16 17:26:54 -0400
committerRich Felker <dalias@aerifal.cx>2012-04-16 17:26:54 -0400
commitf94cbdeb4181e604e193646af16a2e5daa3dd718 (patch)
treec5b95bbb15b06c74b6cb24fe1c646fe919f920e1 /src/stdlib/wcstod.c
parenta4310aa2f592779118912fe5e7f6df4fd6b6d64a (diff)
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implement wcstod and family
not heavily tested but these functions appear to work correctly
Diffstat (limited to 'src/stdlib/wcstod.c')
-rw-r--r--src/stdlib/wcstod.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/stdlib/wcstod.c b/src/stdlib/wcstod.c
new file mode 100644
index 00000000..338c6160
--- /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);
+}