1 files changed, 82 insertions, 0 deletions
diff --git a/mga-bg-res/mga-bg-res.c b/mga-bg-res/mga-bg-res.c
new file mode 100644
index 0000000..6061587
--- /dev/null
+++ b/mga-bg-res/mga-bg-res.c
@@ -0,0 +1,82 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+#define PATH "/usr/share/mga/backgrounds/"
+#define DSTLINK PATH"default.jpg"
+#define SRCLINK_PREFIX PATH"Mageia-Default-"
+#define SRCLINK_SUFFIX ".jpg"
+#define SRCLINK SRCLINK_PREFIX"%s"SRCLINK_SUFFIX
+#define RESSIZE 20
+#define SRCSIZE (RESSIZE+strlen(SRCLINK_PREFIX)+strlen(SRCLINK_SUFFIX) + 1)
+#define ALLOWCHARS "0123456789x"
+
+int main(int argc, char* argv[]) {
+	char src[SRCSIZE];
+	char res[RESSIZE];
+	int l;
+
+	// check argument
+	if (argc != 2) {
+		fprintf(stderr, "Need a resolution argument, eg: '1920x1080'.\n");
+		return 1;
+	}
+
+	// get the res (max RESSIZE)
+	l = snprintf(res, RESSIZE, argv[1]);
+	if (l < 5) {
+		fprintf(stderr, "Malformed resolution argument, eg: '1920x1080'.\n");
+		return 2;
+	}
+
+	// to be sure, set the last char as 0
+	if (l < RESSIZE)
+		res[l] = 0;
+	else
+		res[RESSIZE-1] = 0;
+
+	// check if the resolution contains acceptable chars
+	l = strspn(res, ALLOWCHARS);
+	if (l < 5) {
+		fprintf(stderr, "Malformed resolution argument, eg: '1920x1080'.\n");
+		return 2;
+	}
+
+	// to be sure, set the last char as 0
+	if (l < RESSIZE)
+		res[l] = 0;
+	else
+		res[RESSIZE-1] = 0;
+
+	// create target string
+	if (snprintf(src, SRCSIZE, SRCLINK, res) < 0) {
+		fprintf(stderr, "Unknown error determining symlink target.\n");
+		return 3;
+	}
+
+	// check if symlink target exists
+	if (access(src, F_OK) < 0) {
+		fprintf(stderr, "No image for this resolution.\n");
+		return 0;
+	}
+
+	// set symlink
+	if (symlink(src, DSTLINK) < 0) {
+		if (errno != EEXIST) {
+			fprintf(stderr, "Symlink could not be set: %s.\n", strerror(errno));
+			return 4;
+		}
+
+		// since the destination exists, remove and try again
+		if (unlink(DSTLINK) < 0) {
+			fprintf(stderr, "Symlink could not be forced: %s.\n", strerror(errno));
+			return 5;
+		}
+		if (symlink(src, DSTLINK) < 0) {
+			fprintf(stderr, "Unknown error during forced symlink: %s.\n", strerror(errno));
+			return 6;
+		}
+	}
+	return 0;
+}