add shared code in common.c

3 files changed, 24 insertions, 17 deletions

diff --git a/build.sh b/build.sh
index b361ddb..60a538d 100755
--- a/build.sh
+++ b/build.sh
@@ -1,3 +1,4 @@
 #!/bin/sh
-gcc -g -Wall -pedantic -std=c99 -o server server.c
-gcc -g -Wall -pedantic -std=c99 -o chatty client.c
+set -x
+gcc -g -Wall -pedantic -std=c99 -o chatty client.c common.c
+gcc -g -Wall -pedantic -std=c99 -o server server.c common.c
diff --git a/common.c b/common.c
new file mode 100644
index 0000000..b177987
--- /dev/null
+++ b/common.c
@@ -0,0 +1,20 @@
+#include "config.h"
+#include <stdarg.h>
+#include <strings.h>
+#include <unistd.h>
+
+// wrapper for write
+void writef(char *format, ...)
+{
+    va_list args;
+    char buf[BUF_MAX + 1];
+    va_start(args, format);
+
+    vsnprintf(buf, sizeof(buf), format, args);
+    va_end(args);
+
+    int n = 0;
+    while (*(buf + n) != 0)
+        n++;
+    write(0, buf, n);
+}
diff --git a/config.h b/config.h
index 6f8a240..039367d 100644
--- a/config.h
+++ b/config.h
@@ -10,21 +10,7 @@
 // current user's name
 #define USERNAME "unrtdqttr"
 
-// wrapper for write
-void writef(char *format, ...)
-{
-    va_list args;
-    char buf[BUF_MAX +1];
-    va_start(args, format);
-
-    vsnprintf(buf, sizeof(buf), format, args);
-    va_end(args);
-
-    int n = 0;
-    while (*(buf + n) != 0)
-        n++;
-    write(0, buf, n);
-}
+void writef(char* format, ...);
 
 struct message {
     char buf[MSG_MAX];