Moved helpers to a separate file

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

helpers.c

@@ -0,0 +1,95 @@
+
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "helpers.h"
+
+/*
+ * Helpers to replace system() calls
+ */
+
+int makepath(char *p)
+{
+	char *x, path[PATH_MAX];
+	int ret;
+	
+	x = path;
+
+	do {
+		do { *x++ = *p++; } while (*p && *p != '/');
+		ret = mkdir(path, 0777);
+	} while (*p && (*p != '/' || *(p + 1))); /* ignore trailing slash */
+
+	return ret;
+}
+
+void ifconfig(char *name, char *inet, char *mask, int up)
+{
+	struct ifreq ifr;
+	struct sockaddr_in *a = (struct sockaddr_in *)&(ifr.ifr_addr);
+	int sock;
+
+	if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP)) < 0)
+		return;
+
+	memset(&ifr, 0, sizeof (ifr));
+	strncpy(ifr.ifr_name, name, IFNAMSIZ);
+	a->sin_family = AF_INET;
+	inet_aton(inet, &a->sin_addr);
+
+	if (up) {
+		ioctl(sock, SIOCSIFADDR, &ifr);
+		inet_aton(mask, &a->sin_addr);
+		ioctl(sock, SIOCSIFNETMASK, &ifr);
+		ioctl(sock, SIOCGIFFLAGS, &ifr);
+		ifr.ifr_flags |= IFF_UP;
+		ioctl(sock, SIOCSIFFLAGS, &ifr);
+	} else {
+		ioctl(sock, SIOCGIFFLAGS, &ifr);
+		ifr.ifr_flags &= ~IFF_UP;
+		ioctl(sock, SIOCSIFFLAGS, &ifr);
+	}
+	
+	close(sock);
+}
+
+#define BUF_SIZE 4096
+
+void copyfile(char *src, char *dst, int size)
+{
+	char buffer[BUF_SIZE];
+	int s, d, n;
+
+	if ((s = open(src, O_RDONLY)) >= 0) {
+		if ((d = open(dst, O_WRONLY | O_CREAT, 0644)) >= 0) {
+
+			/* Size <= 0 means copy entire file */
+			if (size <= 0) {
+				do {
+					if ((n = read(s, buffer, BUF_SIZE)) > 0)
+						write(d, buffer, n);
+				} while (n == BUF_SIZE);
+			} else {
+				do {
+					int csize = size > BUF_SIZE ?
+							BUF_SIZE : size;
+			
+					if ((n = read(s, buffer, csize)) > 0)
+						write(d, buffer, n);
+					size -= csize;
+				} while (size > 0 && n == BUF_SIZE);
+			}
+			close(d);
+		}
+		close(s);
+	}
+}
+