new restartable integer parsing framework.

this fixes a number of bugs in integer parsing due to lazy haphazard
wrapping, as well as some misinterpretations of the standard. the new
parser is able to work character-at-a-time or on whole strings, making
it easy to support the wide functions without unbounded space for
conversion. it will also be possible to update scanf to use the new
parser.

1 files changed, 25 insertions, 11 deletions

diff --git a/src/stdlib/wcstoimax.c b/src/stdlib/wcstoimax.c
index 59894f60..b83206b7 100644
--- a/src/stdlib/wcstoimax.c
+++ b/src/stdlib/wcstoimax.c
@@ -2,24 +2,38 @@
 #include <wctype.h>
 #include <inttypes.h>
 #include <errno.h>
+#include "intparse.h"
 
 intmax_t wcstoimax(const wchar_t *s, wchar_t **p, int base)
 {
-	int sign = 0;
-	uintmax_t x;
+	struct intparse ip = {0};
+	unsigned char tmp;
+
+	if (p) *p = (wchar_t *)s;
+
+	if (base && base-2U > 34) {
+		errno = EINVAL;
+		return 0;
+	}
 
-	/* Initial whitespace */
 	for (; iswspace(*s); s++);
 
-	/* Optional sign */
-	if (*s == '-') sign = *s++;
-	else if (*s == '+') s++;
+	ip.base = base;
+	for (; *s<256 && (tmp=*s, __intparse(&ip, &tmp, 1)); s++);
+
+	if (p && ip.err != EINVAL)
+		*p = (wchar_t *)s;
+
+	if (ip.err) {
+		errno = ip.err;
+		if (ip.err = EINVAL) return 0;
+		return ip.neg ? INTMAX_MIN : INTMAX_MAX;
+	}
 
-	x = wcstoumax(s, p, base);
-	if (x > INTMAX_MAX) {
-		if (!sign || -x != INTMAX_MIN)
+	if (ip.val > INTMAX_MAX) {
+		if (!ip.neg || -ip.val != INTMAX_MIN)
 			errno = ERANGE;
-		return sign ? INTMAX_MIN : INTMAX_MAX;
+		return ip.neg ? INTMAX_MIN : INTMAX_MAX;
 	}
-	return sign ? -x : x;
+	return ip.neg ? -ip.val : ip.val;
 }