1 files changed, 97 insertions, 0 deletions
diff --git a/utils.c b/utils.c
index a45826b9e..cc5bf3b22 100755
--- a/utils.c
+++ b/utils.c
@@ -632,3 +632,100 @@ int vasprintf(char **strp, const char *fmt, va_list ap)
 	return size;
 }
 #endif
+
+#ifndef HAVE_STRTOQ
+#define LONG_MIN        (-9223372036854775807L-1L)
+                                        /* min value of a "long int" */
+#define LONG_MAX        9223372036854775807L
+                                        /* max value of a "long int" */
+
+/*
+ * Convert a string to a quad integer.
+ *
+ * Ignores `locale' stuff.  Assumes that the upper and lower case
+ * alphabets and digits are each contiguous.
+ */
+uint64_t strtoq(const char *nptr, char **endptr, int base)
+{
+        const char *s;
+        uint64_t acc;
+        unsigned char c;
+        uint64_t qbase, cutoff;
+        int neg, any, cutlim;
+
+        /*
+         * Skip white space and pick up leading +/- sign if any.
+         * If base is 0, allow 0x for hex and 0 for octal, else
+         * assume decimal; if base is already 16, allow 0x.
+         */
+        s = nptr;
+        do {
+                c = *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;
+
+        /*
+         * Compute the cutoff value between legal numbers and illegal
+         * numbers.  That is the largest legal value, divided by the
+         * base.  An input number that is greater than this value, if
+         * followed by a legal input character, is too big.  One that
+         * is equal to this value may be valid or not; the limit
+         * between valid and invalid numbers is then based on the last
+         * digit.  For instance, if the range for quads is
+         * [-9223372036854775808..9223372036854775807] and the input base
+         * is 10, cutoff will be set to 922337203685477580 and cutlim to
+         * either 7 (neg==0) or 8 (neg==1), meaning that if we have
+         * accumulated a value > 922337203685477580, or equal but the
+         * next digit is > 7 (or 8), the number is too big, and we will
+         * return a range error.
+         *
+         * Set any if any `digits' consumed; make it negative to indicate
+         * overflow.
+         */
+        qbase = (unsigned)base;
+        cutoff = neg ? (uint64_t)-(LONG_MIN + LONG_MAX) + LONG_MAX : LONG_MAX;
+        cutlim = cutoff % qbase;
+        cutoff /= qbase;
+        for (acc = 0, any = 0;; c = *s++) {
+                if (!isascii(c))
+                        break;
+                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 || acc > cutoff || (acc == cutoff && c > cutlim))
+                        any = -1;
+                else {
+                        any = 1;
+                        acc *= qbase;
+                        acc += c;
+                }
+        }
+        if (any < 0) {
+                acc = neg ? LONG_MIN : LONG_MAX;
+        } else if (neg)
+                acc = -acc;
+        if (endptr != 0)
+                *((const char **)endptr) = any ? s - 1 : nptr;
+        return (acc);
+}
+#endif