1 files changed, 121 insertions, 0 deletions
diff --git a/libsigsegv/src/stackvma-rofile.c b/libsigsegv/src/stackvma-rofile.c
new file mode 100644
index 00000000..d6d19394
--- /dev/null
+++ b/libsigsegv/src/stackvma-rofile.c
@@ -0,0 +1,121 @@
+/* Buffered read-only streams.
+   Copyright (C) 2008  Bruno Haible <bruno@clisp.org>
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#include <errno.h> /* errno, EINTR */
+#include <fcntl.h> /* O_RDONLY */
+#include <stddef.h> /* size_t */
+#include <unistd.h> /* read, close */
+
+/* Buffered read-only streams.
+   We cannot use <stdio.h> here, because fopen() calls malloc(), and a malloc()
+   call may have been interrupted.  */
+
+struct rofile
+  {
+    int fd;
+    size_t position;
+    size_t filled;
+    int eof_seen;
+    char buffer[4096];
+  };
+
+/* Open a read-only file stream.  */
+static int
+rof_open (struct rofile *rof, const char *filename)
+{
+  int fd = open (filename, O_RDONLY);
+  if (fd < 0)
+    return -1;
+  rof->fd = fd;
+  rof->position = 0;
+  rof->filled = 0;
+  rof->eof_seen = 0;
+  return 0;
+}
+
+/* Return the next byte from a read-only file stream without consuming it,
+   or -1 at EOF.  */
+static int
+rof_peekchar (struct rofile *rof)
+{
+  if (rof->position == rof->filled)
+    {
+      if (rof->eof_seen)
+        return -1;
+      else
+        for (;;)
+          {
+            int n = read (rof->fd, rof->buffer, sizeof (rof->buffer));
+#ifdef EINTR
+            if (n < 0 && errno == EINTR)
+              continue;
+#endif
+            if (n <= 0)
+              {
+                rof->eof_seen = 1;
+                return -1;
+              }
+            rof->filled = n;
+            rof->position = 0;
+            break;
+          }
+    }
+  return (unsigned char) rof->buffer[rof->position];
+}
+
+/* Return the next byte from a read-only file stream, or -1 at EOF.  */
+static int
+rof_getchar (struct rofile *rof)
+{
+  int c = rof_peekchar (rof);
+  if (c >= 0)
+    rof->position++;
+  return c;
+}
+
+/* Parse an unsigned hexadecimal number from a read-only file stream.  */
+static int
+rof_scanf_lx (struct rofile *rof, unsigned long *valuep)
+{
+  unsigned long value = 0;
+  unsigned int numdigits = 0;
+  for (;;)
+    {
+      int c = rof_peekchar (rof);
+      if (c >= '0' && c <= '9')
+        value = (value << 4) + (c - '0');
+      else if (c >= 'A' && c <= 'F')
+        value = (value << 4) + (c - 'A' + 10);
+      else if (c >= 'a' && c <= 'f')
+        value = (value << 4) + (c - 'a' + 10);
+      else
+        break;
+      rof_getchar (rof);
+      numdigits++;
+    }
+  if (numdigits == 0)
+    return -1;
+  *valuep = value;
+  return 0;
+}
+
+/* Close a read-only file stream.  */
+static void
+rof_close (struct rofile *rof)
+{
+  close (rof->fd);
+}