Init

lib/libc/stdio/common/fwrite.c

@@ -0,0 +1,79 @@
+#if !defined(lint) && defined(SCCSIDS)
+static	char sccsid[] = "@(#)fwrite.c 1.1 94/10/31 SMI"; /* from S5R2 3.6 */
+#endif
+
+/*LINTLIBRARY*/
+/*
+ * This version writes directly to the buffer rather than looping on putc.
+ * Ptr args aren't checked for NULL because the program would be a
+ * catastrophic mess anyway.  Better to abort than just to return NULL.
+ *
+ * This version does buffered writes larger than BUFSIZ directly, when
+ * the buffer is empty.
+ */
+#include <stdio.h>
+#include "stdiom.h"
+#include <errno.h>
+
+#define MIN(x, y)       (x < y ? x : y)
+
+extern char *memcpy();
+
+int
+fwrite(ptr, size, count, iop)
+char *ptr;
+int size, count;
+register FILE *iop;
+{
+	register unsigned nleft;
+	register int n;
+	register unsigned char *cptr, *bufend;
+	register unsigned char *prev_ptr;
+
+	if (size <= 0 || count <= 0 || _WRTCHK(iop)) {
+#ifdef POSIX
+		errno = EBADF;
+#endif POSIX
+	        return (0);
+	}
+
+	bufend = iop->_base + iop->_bufsiz;
+	nleft = count*size;
+
+	/* if the file is unbuffered, or if the iop->ptr = iop->base, and there
+	   is > BUFSZ chars to write, we can do a direct write */
+	prev_ptr = iop->_ptr;
+	if (iop->_base >= iop->_ptr)  {	/*this covers the unbuffered case, too*/
+		if (((iop->_flag & _IONBF) != 0) || (nleft >= BUFSIZ))  {
+			if ((n=write(fileno(iop),ptr,nleft)) != nleft)
+			    {
+				iop->_flag |= _IOERR;
+				n = (n >= 0) ? n : 0;
+			}
+			return n/size;
+		}
+	}
+	/* Put characters in the buffer */
+	/* note that the meaning of n when just starting this loop is
+	   irrelevant.  It is defined in the loop */
+	for (; ; ptr += n) {
+	        while ((n = bufend - (cptr = iop->_ptr)) <= 0)  /* full buf */
+	                if (_xflsbuf(iop) == EOF)
+	                        return (count - (nleft + size - 1)/size);
+	        n = MIN(nleft, n);
+	        (void) memcpy((char *) cptr, ptr, n);
+	        iop->_cnt -= n;
+	        iop->_ptr += n;
+	        _BUFSYNC(iop);
+		/* done; flush if linebuffered with a newline */
+	        if ((nleft -= n) == 0)  { 
+			if (iop->_flag & (_IOLBF | _IONBF)) {
+	               		if ((iop->_flag & _IONBF) || (memchr(prev_ptr,
+					'\n',iop->_ptr - prev_ptr) != NULL))  {
+				     	(void) _xflsbuf(iop);
+				}
+			}
+	                return (count);
+	        }
+	}
+}