1 files changed, 57 insertions, 0 deletions
diff --git a/src/journal/pcre2-dlopen.c b/src/journal/pcre2-dlopen.c
new file mode 100644
index 0000000..fbe81f9
--- /dev/null
+++ b/src/journal/pcre2-dlopen.c
@@ -0,0 +1,57 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "alloc-util.h"
+#include "dlfcn-util.h"
+#include "pcre2-dlopen.h"
+
+#if HAVE_PCRE2
+static void *pcre2_dl = NULL;
+
+pcre2_match_data* (*sym_pcre2_match_data_create)(uint32_t, pcre2_general_context *);
+void (*sym_pcre2_match_data_free)(pcre2_match_data *);
+void (*sym_pcre2_code_free)(pcre2_code *);
+pcre2_code* (*sym_pcre2_compile)(PCRE2_SPTR, PCRE2_SIZE, uint32_t, int *, PCRE2_SIZE *, pcre2_compile_context *);
+int (*sym_pcre2_get_error_message)(int, PCRE2_UCHAR *, PCRE2_SIZE);
+int (*sym_pcre2_match)(const pcre2_code *, PCRE2_SPTR, PCRE2_SIZE, PCRE2_SIZE, uint32_t, pcre2_match_data *, pcre2_match_context *);
+PCRE2_SIZE* (*sym_pcre2_get_ovector_pointer)(pcre2_match_data *);
+
+int dlopen_pcre2(void) {
+        _cleanup_(dlclosep) void *dl = NULL;
+        int r;
+
+        if (pcre2_dl)
+                return 0; /* Already loaded */
+
+        dl = dlopen("libpcre2-8.so.0", RTLD_LAZY);
+        if (!dl)
+                return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                                       "PCRE2 support is not installed: %s", dlerror());
+
+        r = dlsym_many_and_warn(
+                        dl,
+                        LOG_ERR,
+                        &sym_pcre2_match_data_create, "pcre2_match_data_create_8",
+                        &sym_pcre2_match_data_free, "pcre2_match_data_free_8",
+                        &sym_pcre2_code_free, "pcre2_code_free_8",
+                        &sym_pcre2_compile, "pcre2_compile_8",
+                        &sym_pcre2_get_error_message, "pcre2_get_error_message_8",
+                        &sym_pcre2_match, "pcre2_match_8",
+                        &sym_pcre2_get_ovector_pointer, "pcre2_get_ovector_pointer_8",
+                        NULL);
+        if (r < 0)
+                return r;
+
+        /* Note that we never release the reference here, because there's no real reason to, after all this
+         * was traditionally a regular shared library dependency which lives forever too. */
+        pcre2_dl = TAKE_PTR(dl);
+
+        return 1;
+}
+
+#else
+
+int dlopen_pcre2(void) {
+        return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+                               "PCRE2 support is not compiled in.");
+}
+#endif