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#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;
}
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