Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Stdio / stdio.c

diff --git a/StdLib/LibC/Stdio/stdio.c b/StdLib/LibC/Stdio/stdio.c
new file mode 100644 (file)
index 0000000..005a438
--- /dev/null
+++ b/StdLib/LibC/Stdio/stdio.c
@@ -0,0 +1,117 @@
+/** @file\r
+    Small standard I/O/seek/close functions.\r
+    These maintain the `known seek offset' for seek optimisation.\r
+\r
+    Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>\r
+    This program and the accompanying materials are licensed and made available\r
+    under the terms and conditions of the BSD License that accompanies this\r
+    distribution.  The full text of the license may be found at\r
+    http://opensource.org/licenses/bsd-license.php.\r
+\r
+    THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+    WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+    Copyright (c) 1990, 1993\r
+    The Regents of the University of California.  All rights reserved.\r
+\r
+    This code is derived from software contributed to Berkeley by\r
+    Chris Torek.\r
+\r
+    Redistribution and use in source and binary forms, with or without\r
+    modification, are permitted provided that the following conditions\r
+    are met:\r
+      - Redistributions of source code must retain the above copyright\r
+        notice, this list of conditions and the following disclaimer.\r
+      - Redistributions in binary form must reproduce the above copyright\r
+        notice, this list of conditions and the following disclaimer in the\r
+        documentation and/or other materials provided with the distribution.\r
+      - Neither the name of the University nor the names of its contributors\r
+        may be used to endorse or promote products derived from this software\r
+        without specific prior written permission.\r
+\r
+    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"\r
+    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
+    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
+    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE\r
+    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r
+    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r
+    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r
+    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r
+    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r
+    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r
+    POSSIBILITY OF SUCH DAMAGE.\r
+\r
+    NetBSD: stdio.c,v 1.13 2003/08/07 16:43:33 agc Exp\r
+    stdio.c 8.1 (Berkeley) 6/4/93\r
+**/\r
+#include  <LibConfig.h>\r
+\r
+#include  "namespace.h"\r
+\r
+#include  <assert.h>\r
+#include  <errno.h>\r
+#include  <fcntl.h>\r
+#include  <stdio.h>\r
+#include  <sys/EfiSysCall.h>\r
+\r
+#include  "reentrant.h"\r
+#include  "local.h"\r
+\r
+int\r
+__sread(void *cookie, char *buf, int n)\r
+{\r
+  FILE *fp = cookie;\r
+  int ret;\r
+\r
+  _DIAGASSERT(fp != NULL);\r
+  _DIAGASSERT(buf != NULL);\r
+\r
+  ret = (int)read(fp->_file, buf, (size_t)n);\r
+  /* if the read succeeded, update the current offset */\r
+  if (ret >= 0)\r
+    fp->_offset += ret;\r
+  else\r
+    fp->_flags &= ~__SOFF;  /* paranoia */\r
+  return (ret);\r
+}\r
+\r
+int\r
+__swrite(void *cookie, char const *buf, int n)\r
+{\r
+  FILE *fp = cookie;\r
+\r
+  _DIAGASSERT(cookie != NULL);\r
+  _DIAGASSERT(buf != NULL);\r
+\r
+  if (fp->_flags & __SAPP)\r
+    (void) lseek(fp->_file, (off_t)0, SEEK_END);\r
+  fp->_flags &= ~__SOFF;  /* in case FAPPEND mode is set */\r
+  return (int)(write(fp->_file, (char *)buf, (size_t)n));\r
+}\r
+\r
+fpos_t\r
+__sseek(void *cookie, fpos_t offset, int whence)\r
+{\r
+  FILE *fp = cookie;\r
+  off_t ret;\r
+\r
+  _DIAGASSERT(fp != NULL);\r
+\r
+  ret = lseek(fp->_file, (off_t)offset, whence);\r
+  if (ret == -1L)\r
+    fp->_flags &= ~__SOFF;\r
+  else {\r
+    fp->_flags |= __SOFF;\r
+    fp->_offset = ret;\r
+  }\r
+  return (ret);\r
+}\r
+\r
+int\r
+__sclose(void *cookie)\r
+{\r
+\r
+  _DIAGASSERT(cookie != NULL);\r
+\r
+  return (close(((FILE *)cookie)->_file));\r
+}\r