First testing draft of the program. Displays the up and download speed

Makefile

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+# cStatBar Makefile
+
+SRC = cstatbar.c
+OBJ = ${SRC:.c=.o}
+CC = cc
+CFLAGS = -std=c99 -g
+LDFLAGS = -lX11
+
+
+all: options cstatbar
+
+options:
+	@echo cstatusbar build options are as follow:
+	@echo "CFLAGS = ${CFLAGS}"
+	@echo "LDFLAGS = ${LDFLAGS}"
+	@echo "CC = ${CC}"
+
+.c.o:
+	${CC} -c ${CFLAGS} $<
+
+${OBJ}: config.h
+
+config.h:
+	cp config.def.h $@
+
+cstatbar: ${OBJ}
+	${CC} -o $@ ${OBJ} ${LDFLAGS}
+
+clean:
+	rm -f cstatbar ${OBJ}
+
+.PHONY: all options clean

config.def.h

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+static const int cycletime      = 2;  /* time between updates in second */ 
+static const char interface[]   = "enp4s0"; /* The name of the inteface to display information for */
+static const char * icons[]     = { /* Array of icons to be used for the status bar segments */
+    "",    // Icon for date
+    "",    // Icon for battery
+    "",    // Icon for CPU usage
+    "",    // Icon for RAM usage
+    "",    // Icon for disk
+    "龍",   // Icon for network speed
+    "",    // Icon for upload speed 
+    "",    // Icon for download speed 
+    "",    // Icon for network information
+    ""     // Icon for music infos 
+};

config.h

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+static const int cycletime      = 2;  /* time between updates in second */ 
+static const char interface[]   = "enp4s0"; /* The name of the inteface to display information for */
+static const char * icons[]     = { /* Array of icons to be used for the status bar segments */
+    "",    // Icon for date
+    "",    // Icon for battery
+    "",    // Icon for CPU usage
+    "",    // Icon for RAM usage
+    "",    // Icon for disk
+    "龍",   // Icon for network speed
+    "",    // Icon for upload speed 
+    "",    // Icon for download speed 
+    "",    // Icon for network information
+    ""     // Icon for music infos 
+};

cstatbar.c

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+/* cStatBar
+ * 
+ * A simple statusbar to be used with DWM
+ * Gathers different kinds of system info and displays it as the windows title
+ * 
+ * Requires dwm to have the status2d patch applied and a font that supports icons e.g. Nerdfonts
+ *
+ * author: _N0x
+ * version: 0.1
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <X11/Xlib.h>
+
+#include "config.h"
+
+/* enums */ 
+enum { IconDateTime, IconBattery, IconCPU, IconRAM, IconDisk,
+       IconNetSpeed, IconNetSpeedUp, IconNetSpeedDown, IconNetwork, IconMusic };
+
+/* function declaration */
+void setup();
+void setxroot(char *title);
+char *readinfile(char *filename);
+char *getnetworkspeed();
+char *cs(int count, ...);
+
+/* variables */
+static const char *iface;
+static const char kbs[] = "kb/s";
+
+
+/* Uses functionality from Xlib to set the window root name to a specified string */
+void setxroot(char *title)
+{
+    Display * dpy = XOpenDisplay(NULL);
+
+    int screen = DefaultScreen(dpy);
+    Window root = RootWindow(dpy, screen);
+
+    XStoreName(dpy, root, title); 
+    XFlush(dpy);
+
+    XCloseDisplay(dpy);
+}
+
+
+/* Takes in a filename and returns the content of the file */
+char * readinfile(char *fileName)
+{
+    FILE * fd;
+    char * c;
+    int len;
+
+    fd = fopen(fileName, "r");
+    if (fd==NULL) 
+    {
+        perror("Could not read in File.\n");
+        exit(EXIT_FAILURE);
+    }
+   
+    fseek(fd, 0, SEEK_END);
+    len = ftell(fd);
+    fseek(fd, 0, SEEK_SET); 
+    c = malloc(len);
+    fread(c, 1, len, fd);
+    
+    return c;
+}
+
+
+char * getnetworkspeed()
+{
+    char *tmp,*result,*R1,*R2,*T1,*T2;
+    char TT[12], RR[12];
+    
+    tmp = cs(3, "/sys/class/net/", iface, "/statistics/rx_bytes");
+    R1 = readinfile(tmp);
+    free(tmp);
+    
+    tmp = cs(3, "/sys/class/net/", iface, "/statistics/tx_bytes");
+    T1 = readinfile(tmp);
+    free(tmp);
+    
+    sleep(1);
+
+    tmp = cs(3, "/sys/class/net/", iface, "/statistics/rx_bytes");
+    R2 = readinfile(tmp);
+    free(tmp);
+    
+    tmp = cs(3, "/sys/class/net/", iface, "/statistics/tx_bytes");
+    T2 = readinfile(tmp);
+    free(tmp);
+
+    sprintf(RR, "%d", (atoi(R2) - atoi(R1)) / 1024);
+    sprintf(TT, "%d", (atoi(T2) - atoi(T1)) / 1024);
+
+    result = cs(11, icons[IconNetSpeed], " ", 
+            icons[IconNetSpeedUp], " ", TT, kbs, " ", 
+            icons[IconNetSpeedDown], " ", RR, kbs);
+
+    return result;
+}
+
+
+/* a variadic function to take in count number of strings and concatenate them into one single string */
+char * cs(int count, ...)
+{
+    va_list ap;
+    va_start(ap, count);
+    
+    int len = 1;
+    for(int i=0; i<count; i++) { len += strlen(va_arg(ap, char*)); }
+    va_end(ap);
+
+    char * result = malloc(len * sizeof(char));
+    int pos = 0;
+
+    va_start(ap, count);
+    for(int i=0; i<count; i++){
+        char * tmp = va_arg(ap, char *);
+        strcpy(result + pos, tmp);
+        pos += strlen(tmp);
+    }
+    return result;
+}
+
+
+void setup(){
+    iface = interface;
+}
+
+
+int main(int argc, char *argv[])
+{
+    setup();
+
+    while(1) {
+        //setxroot(name); 
+        printf("%s\n", getnetworkspeed());
+
+        sleep(cycletime);
+    }
+}