From 33613a85afc4b1481367fbe92a17ee59c240250b Mon Sep 17 00:00:00 2001
From: Sven Eisenhauer <sven@sven-eisenhauer.net>
Date: Fri, 10 Nov 2023 15:11:48 +0100
Subject: add new repo

---
 Bachelor/Verteilte Systeme/Praktikum1/util.cpp | 86 ++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 Bachelor/Verteilte Systeme/Praktikum1/util.cpp

(limited to 'Bachelor/Verteilte Systeme/Praktikum1/util.cpp')

diff --git a/Bachelor/Verteilte Systeme/Praktikum1/util.cpp b/Bachelor/Verteilte Systeme/Praktikum1/util.cpp
new file mode 100644
index 0000000..88c8f66
--- /dev/null
+++ b/Bachelor/Verteilte Systeme/Praktikum1/util.cpp	
@@ -0,0 +1,86 @@
+/************************************************************************
+ *
+ * Utility functions to use with sockets
+ *
+ ************************************************************************
+
+/************************************************************************
+ *
+ * Read "n" bytes from a descriptor.
+ * Use in place of read() when fd is a stream socket.
+ */
+#include <iostream>
+using namespace std;
+
+int readn(int fd, char* ptr, int nbytes)
+{
+	int	nleft, nread;
+
+	nleft = nbytes;
+	while (nleft > 0) {
+		nread = read(fd, ptr, nleft);
+		if (nread < 0)
+			return(nread);		/* error, return < 0 */
+		else if (nread == 0)
+			break;			/* EOF */
+
+		nleft -= nread;
+		ptr   += nread;
+	}
+	return(nbytes - nleft);		/* return >= 0 */
+}
+/************************************************************************
+
+/************************************************************************
+ *
+ * Read a line from a descriptor.  Read the line one byte at a time,
+ * looking for the newline.  We store the newline in the buffer,
+ * then follow it with a null (the same as fgets(3)).
+ * We return the number of characters up to, but not including,
+ * the null (the same as strlen(3)).
+ */
+int readline(int fd,char* ptr, int maxlen)
+{
+	int	n, rc;
+	char	c;
+
+	for (n = 1; n < maxlen; n++) {
+		if ( (rc = read(fd, &c, 1)) == 1) {
+			*ptr++ = c;
+			if (c == '\n')
+				break;
+		} else if (rc == 0) {
+			if (n == 1)
+				return(0);	/* EOF, no data read */
+			else
+				break;		/* EOF, some data was read */
+		} else
+			return(-1);	/* error */
+	}
+
+	*ptr = 0;
+	return(n);
+}
+/************************************************************************
+
+/************************************************************************
+ *
+ * Write "n" bytes to a descriptor.
+ * Use in place of write() when fd is a stream socket.
+ */
+int writen(int fd, char* ptr, int nbytes)
+{
+	int	nleft, nwritten;
+
+	nleft = nbytes;
+	while (nleft > 0) {
+		nwritten = write(fd, ptr, nleft);
+		if (nwritten <= 0)
+			return(nwritten);		/* error */
+
+		nleft -= nwritten;
+		ptr   += nwritten;
+	}
+	return(nbytes - nleft);
+}
+/************************************************************************/
-- 
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