1 files changed, 105 insertions, 0 deletions

diff --git a/src/lib/libc/stdlib/strtoul.c b/src/lib/libc/stdlib/strtoul.c
new file mode 100644
index 0000000000..1faa0abbd0
--- /dev/null
+++ b/src/lib/libc/stdlib/strtoul.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 1990 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char *rcsid = "$OpenBSD: strtoul.c,v 1.6 2005/03/30 18:51:49 pat Exp $";
+#endif /* LIBC_SCCS and not lint */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+
+/*
+ * Convert a string to an unsigned long integer.
+ *
+ * Ignores `locale' stuff.  Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+unsigned long
+strtoul(const char *nptr, char **endptr, int base)
+{
+        const char *s;
+        unsigned long acc, cutoff;
+        int c;
+        int neg, any, cutlim;
+
+        /*
+         * See strtol for comments as to the logic used.
+         */
+        s = nptr;
+        do {
+                c = (unsigned char) *s++;
+        } while (isspace(c));
+        if (c == '-') {
+                neg = 1;
+                c = *s++;
+        } else {
+                neg = 0;
+                if (c == '+')
+                        c = *s++;
+        }
+        if ((base == 0 || base == 16) &&
+            c == '0' && (*s == 'x' || *s == 'X')) {
+                c = s[1];
+                s += 2;
+                base = 16;
+        }
+        if (base == 0)
+                base = c == '0' ? 8 : 10;
+
+        cutoff = ULONG_MAX / (unsigned long)base;
+        cutlim = ULONG_MAX % (unsigned long)base;
+        for (acc = 0, any = 0;; c = (unsigned char) *s++) {
+                if (isdigit(c))
+                        c -= '0';
+                else if (isalpha(c))
+                        c -= isupper(c) ? 'A' - 10 : 'a' - 10;
+                else
+                        break;
+                if (c >= base)
+                        break;
+                if (any < 0)
+                        continue;
+                if (acc > cutoff || acc == cutoff && c > cutlim) {
+                        any = -1;
+                        acc = ULONG_MAX;
+                        errno = ERANGE;
+                } else {
+                        any = 1;
+                        acc *= (unsigned long)base;
+                        acc += c;
+                }
+        }
+        if (neg && any > 0)
+                acc = -acc;
+        if (endptr != 0)
+                *endptr = (char *) (any ? s - 1 : nptr);
+        return (acc);
+}