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[gapil.git] / sources / full_fwrite.c

diff --git a/sources/full_fwrite.c b/sources/full_fwrite.c
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+/* full_fwrite.c
+ * 
+ * Copyright (C) 2005 Simone Piccardi
+ * 
+ * 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 of the License, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/****************************************************************
+ *
+ * Routine full_fwrite
+ * Routine to write an exact number of bytes into a file
+ *
+ * Author: Simone Piccardi
+ * Mar. 2005
+ *
+ * $Id$ 
+ *
+ ****************************************************************/
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>      /* include standard I/O library */
+
+size_t full_fwrite(FILE *file, const void *buf, size_t count) 
+{
+    size_t nleft;
+    size_t nwritten;
+
+    nleft = count;
+    while (nleft > 0) {             /* repeat until no left */
+       if ( (nwritten = fwrite(buf, 1, nleft, file)) < nleft) {
+           if (ferror(file)) {     /* if error */
+               return(-1);         /* return negative value as error */
+           }
+       }
+       nleft -= nwritten;          /* set left to write */
+       buf +=nwritten;             /* set pointer */
+    }
+    return (nleft);
+}
+