diff options
| -rw-r--r-- | src/stdlib/wcstod.c | 61 |
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); +} |