1 files changed, 100 insertions, 0 deletions
diff --git a/gnu/usr.bin/cvs/lib/strtoul.c b/gnu/usr.bin/cvs/lib/strtoul.c
new file mode 100644
index 00000000000..7d42c210f67
--- /dev/null
+++ b/gnu/usr.bin/cvs/lib/strtoul.c
@@ -0,0 +1,100 @@
+/*
+ * strtol : convert a string to long.
+ *
+ * Andy Wilson, 2-Oct-89.
+ */
+
+#include <errno.h>
+#include <ctype.h>
+#include <stdio.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef ULONG_MAX
+#define	ULONG_MAX	((unsigned long)(~0L))		/* 0xFFFFFFFF */
+#endif
+
+extern int errno;
+
+unsigned long
+strtoul(s, ptr, base)
+     const char *s; char **ptr; int base;
+{
+  unsigned long total = 0;
+  unsigned digit;
+  const char *start=s;
+  int did_conversion=0;
+  int overflow = 0;
+  int negate = 0;
+  unsigned long maxdiv, maxrem;
+
+  if (s==NULL)
+    {
+      errno = ERANGE;
+      if (!ptr)
+	*ptr = (char *)start;
+      return 0L;
+    }
+
+  while (isspace(*s))
+    s++;
+  if (*s == '+')
+    s++;
+  else if (*s == '-')
+    s++, negate = 1;
+  if (base==0 || base==16) /*  the 'base==16' is for handling 0x */
+    {
+      int tmp;
+
+      /*
+       * try to infer base from the string
+       */
+      if (*s != '0')
+        tmp = 10;	/* doesn't start with 0 - assume decimal */
+      else if (s[1] == 'X' || s[1] == 'x')
+	tmp = 16, s += 2; /* starts with 0x or 0X - hence hex */
+      else
+	tmp = 8;	/* starts with 0 - hence octal */
+      if (base==0)
+	base = (int)tmp;
+    }
+
+  maxdiv = ULONG_MAX / base;
+  maxrem = ULONG_MAX % base;
+
+  while ((digit = *s) != '\0')
+    {
+      if (digit >= '0' && digit < ('0'+base))
+	digit -= '0';
+      else
+	if (base > 10)
+	  {
+	    if (digit >= 'a' && digit < ('a'+(base-10)))
+	      digit = digit - 'a' + 10;
+	    else if (digit >= 'A' && digit < ('A'+(base-10)))
+	      digit = digit - 'A' + 10;
+	    else
+	      break;
+	  }
+	else
+	  break;
+      did_conversion = 1;
+      if (total > maxdiv
+	  || (total == maxdiv && digit > maxrem))
+	overflow = 1;
+      total = (total * base) + digit;
+      s++;
+    }
+  if (overflow)
+    {
+      errno = ERANGE;
+      if (ptr != NULL)
+	*ptr = (char *)s;
+      return (ULONG_MAX);
+    }
+  if (ptr != NULL)
+    *ptr = (char *) ((did_conversion) ? (char *)s : (char *)start);
+  return negate ? -total : total;
+}