3 files changed, 102 insertions, 0 deletions
diff --git a/gdb/target/target-utils.c b/gdb/target/target-utils.c
index 4e8fae7..cdfa6e6 100644
--- a/gdb/target/target-utils.c
+++ b/gdb/target/target-utils.c
@@ -19,3 +19,82 @@
 
 #include "common-defs.h"
 #include "target/target-utils.h"
+
+LONGEST
+read_alloc (gdb_byte **buf_p, int handle, read_alloc_pread_ftype *pread_func,
+	    int padding)
+{
+  size_t buf_alloc, buf_pos;
+  gdb_byte *buf;
+  LONGEST n;
+  int target_errno;
+
+  /* Start by reading up to 4K at a time.  The target will throttle
+     this number down if necessary.  */
+  buf_alloc = 4096;
+  buf = xmalloc (buf_alloc);
+  buf_pos = 0;
+  while (1)
+    {
+      n = pread_func (handle, &buf[buf_pos], buf_alloc - buf_pos - padding,
+		      buf_pos, &target_errno);
+      if (n <= 0)
+	{
+	  if (n < 0 || (n == 0 && buf_pos == 0))
+	    xfree (buf);
+	  else
+	    *buf_p = buf;
+	  if (n < 0)
+	    {
+	      /* An error occurred.  */
+	      return -1;
+	    }
+	  else
+	    {
+	      /* Read all there was.  */
+	      return buf_pos;
+	    }
+	}
+
+      buf_pos += n;
+
+      /* If the buffer is filling up, expand it.  */
+      if (buf_alloc < buf_pos * 2)
+	{
+	  buf_alloc *= 2;
+	  buf = xrealloc (buf, buf_alloc);
+	}
+    }
+}
+
+char *
+read_stralloc (struct inferior *inf, const char *filename,
+	       read_stralloc_func_ftype *func)
+{
+  gdb_byte *buffer;
+  char *bufstr;
+  LONGEST i, transferred;
+
+  transferred = func (inf, filename, &buffer, 1);
+  bufstr = (char *) buffer;
+
+  if (transferred < 0)
+    return NULL;
+
+  if (transferred == 0)
+    return xstrdup ("");
+
+  bufstr[transferred] = 0;
+
+  /* Check for embedded NUL bytes; but allow trailing NULs.  */
+  for (i = strlen (bufstr); i < transferred; i++)
+    if (bufstr[i] != 0)
+      {
+	warning (_("target file %s "
+		   "contained unexpected null characters"),
+		 filename);
+	break;
+      }
+
+  return bufstr;
+}
diff --git a/gdb/target/target-utils.h b/gdb/target/target-utils.h
index 443ffc3..e8bf52a 100644
--- a/gdb/target/target-utils.h
+++ b/gdb/target/target-utils.h
@@ -20,4 +20,16 @@
 #ifndef TARGET_TARGET_UTILS_H
 #define TARGET_TARGET_UTILS_H
 
+typedef int (read_alloc_pread_ftype) (int handle, gdb_byte *read_buf, int len,
+				      ULONGEST offset, int *target_errno);
+extern LONGEST read_alloc (gdb_byte **buf_p, int handle,
+			   read_alloc_pread_ftype *pread_func, int padding);
+
+struct inferior;
+typedef LONGEST (read_stralloc_func_ftype) (struct inferior *inf,
+					    const char *filename,
+					    gdb_byte **buf_p, int padding);
+extern char *read_stralloc (struct inferior *inf, const char *filename,
+			    read_stralloc_func_ftype *func);
+
 #endif /* TARGET_TARGET_UTILS_H */
diff --git a/gdb/target/target.h b/gdb/target/target.h
index 6ee0fee..4c85fe0 100644
--- a/gdb/target/target.h
+++ b/gdb/target/target.h
@@ -70,4 +70,15 @@ extern void target_stop_and_wait (ptid_t ptid);
 
 extern void target_continue_no_signal (ptid_t ptid);
 
+/* Read target file FILENAME, in the filesystem as seen by INF.  If
+   INF is NULL, use the filesystem seen by the debugger (GDB or, for
+   remote targets, the remote stub).  The result is NUL-terminated and
+   returned as a string, allocated using xmalloc.  If an error occurs
+   or the transfer is unsupported, NULL is returned.  Empty objects
+   are returned as allocated but empty strings.  A warning is issued
+   if the result contains any embedded NUL bytes.  */
+struct inferior;
+extern char *target_fileio_read_stralloc (struct inferior *inf,
+					  const char *filename);
+
 #endif /* TARGET_COMMON_H */