1 files changed, 119 insertions, 0 deletions
diff --git a/winsup/mingw/mingwex/wcstoimax.c b/winsup/mingw/mingwex/wcstoimax.c
new file mode 100644
index 000000000..4b82b14a2
--- /dev/null
+++ b/winsup/mingw/mingwex/wcstoimax.c
@@ -0,0 +1,119 @@
+/*
+    This source code was extracted from the Q8 package created and
+    placed in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil>
+
+    last edit:	1999/11/05	gwyn@arl.mil
+
+	Implements subclause 7.8.2 of ISO/IEC 9899:1999 (E).
+
+	This particular implementation requires the matching <inttypes.h>.
+	It also assumes that character codes for A..Z and a..z are in
+	contiguous ascending order; this is true for ASCII but not EBCDIC.
+*/
+
+#include <wchar.h>
+#include <errno.h>
+#include <ctype.h>
+#include <inttypes.h>
+
+/* convert digit wide character to number, in any base */
+
+#define ToWNumber(c)	(iswdigit(c) ? (c) - L'0' : \
+			 iswupper(c) ? (c) - L'A' + 10 : \
+			 iswlower(c) ? (c) - L'a' + 10 : \
+			 -1		/* "invalid" flag */ \
+			)
+
+/* validate converted digit character for specific base */
+#define valid(n, b)	((n) >= 0 && (n) < (b))
+
+intmax_t
+wcstoimax(nptr, endptr, base)
+	register const wchar_t * __restrict__	nptr;
+	wchar_t ** __restrict__				endptr;
+	register int					base;
+	{
+	register uintmax_t	accum;	/* accumulates converted value */
+	register int		n;	/* numeral from digit character */
+	int			minus;	/* set iff minus sign seen */
+	int			toobig;	/* set iff value overflows */
+
+	if ( endptr != NULL )
+		*endptr = (wchar_t *)nptr;	/* in case no conv performed */
+
+	if ( base < 0 || base == 1 || base > 36 )
+		{
+		errno = EDOM;
+		return 0;		/* unspecified behavior */
+		}
+
+	/* skip initial, possibly empty sequence of white-space w.characters */
+
+	while ( iswspace(*nptr) )
+		++nptr;
+
+	/* process subject sequence: */
+
+	/* optional sign */
+
+	if ( (minus = *nptr == L'-') || *nptr == L'+' )
+		++nptr;
+
+	if ( base == 0 )
+        {
+		if ( *nptr == L'0' )
+            {
+			if ( nptr[1] == L'X' || nptr[1] == L'x' )
+				base = 16;
+			else
+				base = 8;
+            }
+		else
+				base = 10;
+        }
+	/* optional "0x" or "0X" for base 16 */
+
+	if ( base == 16 && *nptr == L'0'
+	  && (nptr[1] == L'X' || nptr[1] == L'x')
+	   )
+		nptr += 2;		/* skip past this prefix */
+
+	/* check whether there is at least one valid digit */
+
+	n = ToWNumber(*nptr);
+	++nptr;
+
+	if ( !valid(n, base) )
+		return 0;		/* subject seq. not of expected form */
+
+	accum = n;
+
+	for ( toobig = 0; n = ToWNumber(*nptr), valid(n, base); ++nptr )
+		if ( accum > INTMAX_MAX / base + 2 )	/* major wrap-around */
+			toobig = 1;	/* but keep scanning */
+		else
+			accum = base * accum + n;
+
+	if ( endptr != NULL )
+		*endptr = (wchar_t *)nptr;	/* -> first not-valid-digit */
+
+	if ( minus )
+		{
+		if ( accum > (uintmax_t)INTMAX_MAX + 1 )
+			toobig = 1;
+		}
+	else
+	if ( accum > (uintmax_t)INTMAX_MAX )
+		toobig = 1;
+
+	if ( toobig )
+		{
+		errno = ERANGE;
+		return minus ? INTMAX_MIN : INTMAX_MAX;
+		}
+	else
+		return (intmax_t)(minus ? -accum : accum);
+	}
+
+long long __attribute__ ((alias ("wcstoimax")))
+wcstoll (const wchar_t* __restrict__ nptr, wchar_t ** __restrict__ endptr, int base);