strtoul() implementation for systems that lack it (from BSD).

svn path=/trunk/yasm/; revision=66

diff --git a/src/strtoul.c b/src/strtoul.c
new file mode 100644 (file)
index 0000000..80b6510
--- /dev/null
+++ b/src/strtoul.c
@@ -0,0 +1,114 @@
+/* $Id: strtoul.c,v 1.1 2001/06/29 02:06:55 peter Exp $
+ * strtoul() implementation for systems that don't have it.
+ *
+ * Copyright (c) 1990, 1993
+ *     The 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 sccsid[] = "@(#)strtoul.c  8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <limits.h>
+#include <ctype.h>
+#include <errno.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+#endif
+
+#include "util.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 = nptr;
+       unsigned long acc;
+       unsigned char c;
+       unsigned long cutoff;
+       int neg = 0, any, cutlim;
+
+       /*
+        * See strtol for comments as to the logic used.
+        */
+       do {
+               c = *s++;
+       } while (isspace(c));
+       if (c == '-') {
+               neg = 1;
+               c = *s++;
+       } else 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 = (unsigned long)ULONG_MAX / (unsigned long)base;
+       cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
+       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 *= base;
+                       acc += c;
+               }
+       }
+       if (any < 0) {
+               acc = ULONG_MAX;
+               errno = ERANGE;
+       } else if (neg)
+               acc = -acc;
+       if (endptr != 0)
+               *endptr = (char *)(any ? s - 1 : nptr);
+       return (acc);
+}