diff options
Diffstat (limited to 'libc-top-half/musl/src/stdlib/wcstod.c')
-rw-r--r-- | libc-top-half/musl/src/stdlib/wcstod.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/stdlib/wcstod.c b/libc-top-half/musl/src/stdlib/wcstod.c new file mode 100644 index 0000000..97b894e --- /dev/null +++ b/libc-top-half/musl/src/stdlib/wcstod.c @@ -0,0 +1,82 @@ +#ifdef __wasilibc_unmodified_upstream // Changes to optimize printf/scanf when long double isn't needed +#else +#include "printscan.h" +#endif +#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; +} + +#if defined(__wasilibc_printscan_no_long_double) +static long_double wcstox(const wchar_t *s, wchar_t **p, int prec) +#else +static long double wcstox(const wchar_t *s, wchar_t **p, int prec) +#endif +{ + wchar_t *t = (wchar_t *)s; + unsigned char buf[64]; + FILE f = {0}; + f.flags = 0; + f.rpos = f.rend = f.buf = buf + 4; + f.buf_size = sizeof buf - 4; +#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT) + f.lock = -1; +#endif + f.read = do_read; + while (iswspace(*t)) t++; + f.cookie = (void *)t; + shlim(&f, 0); +#if defined(__wasilibc_printscan_no_long_double) + long_double y = __floatscan(&f, prec, 1); +#else + long double y = __floatscan(&f, prec, 1); +#endif + 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) +{ +#if defined(__wasilibc_printscan_no_long_double) + long_double_not_supported(); +#else + return wcstox(s, p, 2); +#endif +} |