intercept: Add initial test workaround for libpdf.so

We're seeing some games ship libpdf.so as a directory in their bin
directory with the real library in the lib directory, so this workaround
will hopefully alleviate the crash on start.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

src/intercept/main.c

@@ -377,6 +377,55 @@ static bool lsi_override_x86_derp(__lsi_unused__ const char *orig_name,
 #endif
 }
 
+/**
+ * This helps with a recently seen issue where the game ships "bin/libpdf.so"
+ * as a directory, and not an actual file, which is then seen before the libpdf.so
+ * within the accompanying lib directory.
+ */
+static bool lsi_override_pdf_derp(const char *orig_name, const char **soname)
+{
+        static char path_copy[PATH_MAX];
+        static char path_lookup[PATH_MAX];
+        char *dir = NULL;
+        static const char *pdf_locations[] = {
+                "../lib/libpdf.so",
+                "../lib/x86_44/libpdf.so",
+        };
+
+        if (!strstr(orig_name, "bin/libpdf.so")) {
+                return false;
+        }
+
+        if (!lsi_file_exists(orig_name)) {
+                return false;
+        }
+
+        if (!strcpy(path_copy, orig_name)) {
+                return false;
+        }
+
+        dir = dirname(path_copy);
+
+        for (size_t i = 0; i < sizeof(pdf_locations); i++) {
+                if (snprintf(path_lookup, sizeof(path_lookup), "%s/%s", dir, pdf_locations[i]) <
+                    0) {
+                        return false;
+                }
+                if (!lsi_file_exists(path_lookup)) {
+                        continue;
+                }
+
+                *soname = path_lookup;
+
+                lsi_log_debug(
+                    "Redirected invalid libpdf.so read: \033[31;1m%s\033[0m -> \033[34;1m%s\033[0m",
+                    orig_name,
+                    path_lookup);
+                return true;
+        }
+        return false;
+}
+
 /**
  * Internal helper for path replacement to host lib
  */
@@ -566,6 +615,11 @@ char *lsi_blacklist_vendor(unsigned int flag, const char *name)
                 return (char *)override_soname;
         }
 
+        /* Make sure there isn't an issue with libpdf.so */
+        if (lsi_override_pdf_derp(name, &override_soname)) {
+                return (char *)override_soname;
+        }
+
         /* Find out if its a Steam private lib.. These are relative "./" files too! */
         if (name && (strstr(name, "/Steam/") || strncmp(name, "./", 2) == 0)) {
                 for (size_t i = 0; i < ARRAY_SIZE(vendor_blacklist); i++) {