From 0fd56fe921624596d2cdca7b42e048e63570d8d6 Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Tue, 31 Oct 2006 12:18:49 +0000
Subject: add header file defining read and write macros

git-svn-id: http://arthurdejong.org/svn/nss-pam-ldapd/libnss_ldapd@35 ef36b2f9-881f-0410-afb5-c4e39611909c
---
 nslcd-common.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 nslcd-common.h

(limited to 'nslcd-common.h')

diff --git a/nslcd-common.h b/nslcd-common.h
new file mode 100644
index 0000000..c08050e
--- /dev/null
+++ b/nslcd-common.h
@@ -0,0 +1,84 @@
+
+/* common macros for reading and writing from streams */
+
+#ifndef _NSLCD_COMMON_H
+#define _NSLCD_COMMON_H 1
+
+/* WRITE marcos, used for writing data, on write error they will
+   call the ERROR_OUT_WRITEERROR macro
+   these macros may require the availability of the following
+   variables:
+   int32_t tmpint32; - temporary variable
+   */
+
+#define WRITE(fp,ptr,size) \
+  if (fwrite(ptr,size,1,fp)<1) \
+    { ERROR_OUT_WRITEERROR(fp) }
+
+#define WRITE_TYPE(fp,field,type) \
+  WRITE(fp,&(field),sizeof(type))
+
+#define WRITE_INT32(fp,i) \
+  tmpint32=(int32_t)(i); \
+  WRITE_TYPE(fp,tmpint32,int32_t)
+
+#define WRITE_STRING(fp,str) \
+  WRITE_INT32(fp,strlen(str)); \
+  WRITE(fp,str,strlen(str));
+
+#define WRITE_FLUSH(fp) \
+  if (fflush(fp)<0) \
+    { ERROR_OUT_WRITEERROR(fp) }
+
+/* READ macros, used for reading data, on read error they will
+   call the ERROR_OUT_READERROR or ERROR_OUT_BUFERROR macro
+   these macros may require the availability of the following
+   variables:
+   int32_t tmpint32; - temporary variable
+   char *buffer;     - pointer to a buffer for reading strings
+   size_t buflen;    - the size of the buffer
+   size_t bufptr;    - the current position in the buffer
+   */
+
+#define READ(fp,ptr,size) \
+  if (fread(ptr,size,1,fp)<1) \
+    { ERROR_OUT_READERROR(fp) }
+
+#define READ_TYPE(fp,field,type) \
+  READ(fp,&(field),sizeof(type))
+
+#define READ_INT32(fp,i) \
+  READ_TYPE(fp,tmpint32,int32_t); \
+  i=tmpint32;
+
+/* read string in the buffer (using buffer, buflen and bufptr)
+   and store the actual location of the string in field */
+#define READ_STRING_BUF(fp,field) \
+  /* read the size of the string */ \
+  READ_TYPE(fp,tmpint32,int32_t); \
+  /* check if read would fit */ \
+  if ((bufptr+(size_t)tmpint32+1)>buflen) \
+    { ERROR_OUT_BUFERROR(fp) } /* will not fit */ \
+  /* read string from the stream */ \
+  READ(fp,buffer+bufptr,(size_t)tmpint32); \
+  /* null-terminate string in buffer */ \
+  buffer[bufptr+tmpint32]='\0'; \
+  /* prepare result */ \
+  (field)=buffer+bufptr; \
+  bufptr+=tmpint32+1;
+
+/* read a string from the stream dynamically allocating memory
+   for the string (don't forget to call free() later on) */
+#define READ_STRING_ALLOC(fp,field) \
+  /* read the size of the string */ \
+  READ_TYPE(fp,tmpint32,int32_t); \
+  /* allocate memory */ \
+  (field)=(char *)malloc((size_t)(tmpint32+1)); \
+  if ((field)==NULL) \
+    { ERROR_OUT_ALLOCERROR(fp) } /* problem allocating */ \
+  /* read string from the stream */ \
+  READ(fp,name,(size_t)tmpint32); \
+  /* null-terminate string in buffer */ \
+  (name)[tmpint32]='\0';
+
+#endif /* not _NSLCD_COMMON_H */
-- 
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