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/* Spotify looks for its theme data in /usr/share/spotify/theme. This
LD_PRELOAD library intercepts open() and stat() calls to redirect
them to the corresponding location in $out. */
#define _GNU_SOURCE
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <limits.h>
char themeDir [] = "/usr/share/spotify/theme";
char realThemeDir [] = OUT "/share/spotify/theme";
const char * rewrite(const char * path, char * buf)
{
if (strncmp(path, themeDir, sizeof(themeDir) - 1) != 0) return path;
if (snprintf(buf, PATH_MAX, "%s%s", realThemeDir, path + sizeof(themeDir) - 1) >= PATH_MAX)
abort();
return buf;
}
int open(const char *path, int flags, ...)
{
char buf[PATH_MAX];
int (*_open) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open");
mode_t mode = 0;
if (flags & O_CREAT) {
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
}
return _open(rewrite(path, buf), flags, mode);
}
int open64(const char *path, int flags, ...)
{
char buf[PATH_MAX];
int (*_open64) (const char *, int, mode_t) = dlsym(RTLD_NEXT, "open64");
mode_t mode = 0;
if (flags & O_CREAT) {
va_list ap;
va_start(ap, flags);
mode = va_arg(ap, mode_t);
va_end(ap);
}
return _open64(rewrite(path, buf), flags, mode);
}
int __xstat64(int ver, const char *path, struct stat64 *st)
{
char buf[PATH_MAX];
int (*___xstat64) (int ver, const char *, struct stat64 *) = dlsym(RTLD_NEXT, "__xstat64");
return ___xstat64(ver, rewrite(path, buf), st);
}
int access(const char *path, int mode)
{
char buf[PATH_MAX];
int (*_access) (const char *path, int mode) = dlsym(RTLD_NEXT, "access");
return _access(rewrite(path, buf), mode);
}
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