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Build nfd_portal.cpp on older glibc and dbus APIs.

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<sys/random.h> is available as of [glibc 2.25](https://sourceware.org/legacy-ml/libc-alpha/2017-02/msg00079.html). Add fallback implementation using `syscall` for older versions, adapted from [btzy/nativefiledialog-extended@44e63d5](44e63d5e57).
`dbus_message_iter_get_element_count` is available as of [D-Bus 1.9.16](https://launchpad.net/debian/+source/dbus/1.9.16-1). Fallback on counting elements manually.
This commit is contained in:
Giorge Koulin 2023-03-31 09:08:48 +01:00
parent 9ecda53ba3
commit 9096c63b5d
1 changed files with 20 additions and 2 deletions
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20
nfd/nfd_portal.cpp
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@ -14,9 +14,17 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/random.h> // for the random token string
#include <unistd.h> // for access()
#if !defined(__has_include) || !defined(__linux__)
#include <sys/random.h> // for getrandom() - the random token string
#elif __has_include(<sys/random.h>)
#include <sys/random.h>
#else // for GLIBC < 2.25
#include <sys/syscall.h>
#define getrandom(buf, sz, flags) syscall(SYS_getrandom, buf, sz, flags)
#endif
#include "nfd.h"
/*
@ -705,7 +713,17 @@ nfdpathsetsize_t ReadResponseUrisUncheckedGetArraySize(DBusMessage* msg) {
nfdpathsetsize_t sz = 0; // Initialization will never be used, but we initialize it to prevent
// the uninitialized warning otherwise.
ReadDict(iter, "uris", [&sz](DBusMessageIter& uris_iter) {
// `dbus_message_iter_get_element_count` is available as of [D-Bus 1.9.16](https://launchpad.net/debian/+source/dbus/1.9.16-1).
#if DBUS_MAJOR_VERSION > 1 || DBUS_MINOR_VERSION > 9 || (DBUS_MINOR_VERSION == 9 && DBUS_MINOR_VERSION >= 16)
sz = dbus_message_iter_get_element_count(&uris_iter);
#else // Otherwise fallback on counting elements manually.
sz = 0;
DBusMessageIter uri_iter;
dbus_message_iter_recurse(&uris_iter, &uri_iter);
do {
++sz;
} while (dbus_message_iter_next(&uri_iter));
#endif
return NFD_OKAY;
});
return sz;