From b05ac67f5e11d06fc6eefd65556f036998a0a0bb Mon Sep 17 00:00:00 2001
From: ache <ache@FreeBSD.org>
Date: Fri, 21 Jan 2005 00:42:13 +0000
Subject: [PATCH] POSIX says that 0[xX] prefix is _optional_ even in base 16
 case, make it really so.

"If the value of base is 16, the characters 0x or 0X may optionally
precede the sequence of letters and digits, following the sign if
present."

Found by:       joerg
---
 lib/libc/stdlib/strtoimax.c | 6 +++++-
 lib/libc/stdlib/strtol.c    | 6 +++++-
 lib/libc/stdlib/strtoll.c   | 6 +++++-
 lib/libc/stdlib/strtoul.c   | 6 +++++-
 lib/libc/stdlib/strtoull.c  | 6 +++++-
 lib/libc/stdlib/strtoumax.c | 6 +++++-
 6 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/lib/libc/stdlib/strtoimax.c b/lib/libc/stdlib/strtoimax.c
index 0cb387b64ad9..147fce2b98a3 100644
--- a/lib/libc/stdlib/strtoimax.c
+++ b/lib/libc/stdlib/strtoimax.c
@@ -75,7 +75,11 @@ strtoimax(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;
diff --git a/lib/libc/stdlib/strtol.c b/lib/libc/stdlib/strtol.c
index 658628e370c6..5aae7f9dc0bc 100644
--- a/lib/libc/stdlib/strtol.c
+++ b/lib/libc/stdlib/strtol.c
@@ -76,7 +76,11 @@ strtol(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;
diff --git a/lib/libc/stdlib/strtoll.c b/lib/libc/stdlib/strtoll.c
index 2eb3a509a58c..6cbe76abae99 100644
--- a/lib/libc/stdlib/strtoll.c
+++ b/lib/libc/stdlib/strtoll.c
@@ -75,7 +75,11 @@ strtoll(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;
diff --git a/lib/libc/stdlib/strtoul.c b/lib/libc/stdlib/strtoul.c
index 2146a98b8ac0..a8e37364101b 100644
--- a/lib/libc/stdlib/strtoul.c
+++ b/lib/libc/stdlib/strtoul.c
@@ -73,7 +73,11 @@ strtoul(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;
diff --git a/lib/libc/stdlib/strtoull.c b/lib/libc/stdlib/strtoull.c
index 1720a8f6571c..0e80b0d51295 100644
--- a/lib/libc/stdlib/strtoull.c
+++ b/lib/libc/stdlib/strtoull.c
@@ -73,7 +73,11 @@ strtoull(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;
diff --git a/lib/libc/stdlib/strtoumax.c b/lib/libc/stdlib/strtoumax.c
index ddaee5935a4b..91d5d07ea4c8 100644
--- a/lib/libc/stdlib/strtoumax.c
+++ b/lib/libc/stdlib/strtoumax.c
@@ -73,7 +73,11 @@ strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base)
 			c = *s++;
 	}
 	if ((base == 0 || base == 16) &&
-	    c == '0' && (*s == 'x' || *s == 'X')) {
+	    c == '0' && (*s == 'x' || *s == 'X') &&
+	    ((s[1] >= 'a' && s[1] <= 'f') ||
+	     (s[1] >= 'A' && s[1] <= 'F') ||
+	     (s[1] >= '0' && s[1] <= '9'))
+	   ) {
 		c = s[1];
 		s += 2;
 		base = 16;