1 files changed, 171 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..8f9405d
--- /dev/null
+++ b/util.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 2004,2005 Michael Schroeder (mls@suse.de)
+ *
+ * This program is licensed under the BSD license, read LICENSE.BSD
+ * for further information
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "util.h"
+
+/****************************************************************
+ *
+ * utility functions
+ *
+ */
+
+void *
+xmalloc(size_t len)
+{
+  void *r = malloc(len ? len : 1);
+  if (r)
+    return r;
+  fprintf(stderr, "Out of memory allocating %zu bytes!\n", len);
+  exit(1);
+}
+
+void *
+xmalloc2(size_t num, size_t len)
+{
+  if (len && (num * len) / len != num)
+    {
+      fprintf(stderr, "Out of memory allocating %zu*%zu bytes!\n", num, len);
+      exit(1);
+    }
+  return xmalloc(num * len);
+}
+
+void *
+xrealloc(void *old, size_t len)
+{
+  if (old == 0)
+    old = malloc(len ? len : 1);
+  else
+    old = realloc(old, len ? len : 1);
+  if (old)
+    return old;
+  fprintf(stderr, "Out of memory reallocating %zu bytes!\n", len);
+  exit(1);
+}
+
+void *
+xrealloc2(void *old, size_t num, size_t len)
+{
+  if (len && (num * len) / len != num)
+    {
+      fprintf(stderr, "Out of memory allocating %zu*%zu bytes!\n", num, len);
+      exit(1);
+    }
+  return xrealloc(old, num * len);
+}
+
+void *
+xcalloc(size_t num, size_t len)
+{
+  void *r = calloc(num, len);
+  if (r)
+    return r;
+  fprintf(stderr, "Out of memory allocating %zu*%zu bytes!\n", num, len);
+  exit(1);
+}
+
+void *
+xfree(void *mem)
+{
+  if (mem)
+    free(mem);
+  return 0;
+}
+
+ssize_t
+xread(int fd, void *buf, size_t l)
+{
+  size_t ol = l;
+  ssize_t r;
+
+  while (l)
+    {
+      r = read(fd, buf, l); 
+      if (r < 0) 
+	{
+	  if (errno == EINTR)
+	    continue;
+          return r;
+	}
+      if (r == 0)
+        return ol - l;
+      buf += r;
+      l -= r;
+    }
+  return ol;
+}
+
+int
+parsehex(char *s, unsigned char *hex, int len)
+{
+  int i, r = 0;
+
+  len *= 2;
+  for (i = 0; ; i++, s++)
+    {
+      if (*s == 0 && !(i & 1))
+	return i / 2;
+      if (i == len)
+	{
+	  fprintf(stderr, "parsehex: string too long\n");
+	  exit(1);
+	}
+      if (*s >= '0' && *s <= '9')
+	r = (r << 4) | (*s - '0');
+      else if (*s >= 'a' && *s <= 'f')
+	r = (r << 4) | (*s - ('a' - 10));
+      else if (*s >= 'A' && *s <= 'F')
+	r = (r << 4) | (*s - ('a' - 10));
+      else
+	{
+	  fprintf(stderr, "parsehex: bad string\n");
+	  exit(1);
+	}
+      if ((i & 1) != 0)
+	{
+	  hex[i / 2] = r;
+	  r = 0;
+	}
+    }
+}
+
+void
+parsemd5(char *s, unsigned char *md5)
+{
+  if (!*s)
+    {
+      memset(md5, 0, 16);
+      return;
+    }
+  if (parsehex(s, md5, 16) != 16)
+    {
+      fprintf(stderr, "parsemd5: bad md5\n");
+      exit(1);
+    }
+}
+
+void
+parsesha256(char *s, unsigned char *sha256)
+{
+  if (!*s)
+    {
+      memset(sha256, 0, 32);
+      return;
+    }
+  if (parsehex(s, sha256, 32) != 32)
+    {
+      fprintf(stderr, "parsesha256: bad sha256\n");
+      exit(1);
+    }
+}
+