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-rw-r--r--src/core/show-status.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/src/core/show-status.c b/src/core/show-status.c
new file mode 100644
index 0000000..f748a82
--- /dev/null
+++ b/src/core/show-status.c
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "alloc-util.h"
+#include "fd-util.h"
+#include "io-util.h"
+#include "parse-util.h"
+#include "show-status.h"
+#include "string-table.h"
+#include "string-util.h"
+#include "terminal-util.h"
+#include "util.h"
+
+static const char* const show_status_table[_SHOW_STATUS_MAX] = {
+ [SHOW_STATUS_NO] = "no",
+ [SHOW_STATUS_AUTO] = "auto",
+ [SHOW_STATUS_TEMPORARY] = "temporary",
+ [SHOW_STATUS_YES] = "yes",
+};
+
+DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(show_status, ShowStatus, SHOW_STATUS_YES);
+
+int parse_show_status(const char *v, ShowStatus *ret) {
+ ShowStatus s;
+
+ assert(ret);
+
+ s = show_status_from_string(v);
+ if (s < 0 || s == SHOW_STATUS_TEMPORARY)
+ return -EINVAL;
+
+ *ret = s;
+ return 0;
+}
+
+int status_vprintf(const char *status, ShowStatusFlags flags, const char *format, va_list ap) {
+ static const char status_indent[] = " "; /* "[" STATUS "] " */
+ _cleanup_free_ char *s = NULL;
+ _cleanup_close_ int fd = -1;
+ struct iovec iovec[7] = {};
+ int n = 0;
+ static bool prev_ephemeral;
+
+ assert(format);
+
+ /* This is independent of logging, as status messages are
+ * optional and go exclusively to the console. */
+
+ if (vasprintf(&s, format, ap) < 0)
+ return log_oom();
+
+ /* Before you ask: yes, on purpose we open/close the console for each status line we write individually. This
+ * is a good strategy to avoid PID 1 getting killed by the kernel's SAK concept (it doesn't fix this entirely,
+ * but minimizes the time window the kernel might end up killing PID 1 due to SAK). It also makes things easier
+ * for us so that we don't have to recover from hangups and suchlike triggered on the console. */
+
+ fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return fd;
+
+ if (FLAGS_SET(flags, SHOW_STATUS_ELLIPSIZE)) {
+ char *e;
+ size_t emax, sl;
+ int c;
+
+ c = fd_columns(fd);
+ if (c <= 0)
+ c = 80;
+
+ sl = status ? sizeof(status_indent)-1 : 0;
+
+ emax = c - sl - 1;
+ if (emax < 3)
+ emax = 3;
+
+ e = ellipsize(s, emax, 50);
+ if (e)
+ free_and_replace(s, e);
+ }
+
+ if (prev_ephemeral)
+ iovec[n++] = IOVEC_MAKE_STRING(ANSI_REVERSE_LINEFEED "\r" ANSI_ERASE_TO_END_OF_LINE);
+
+ if (status) {
+ if (!isempty(status)) {
+ iovec[n++] = IOVEC_MAKE_STRING("[");
+ iovec[n++] = IOVEC_MAKE_STRING(status);
+ iovec[n++] = IOVEC_MAKE_STRING("] ");
+ } else
+ iovec[n++] = IOVEC_MAKE_STRING(status_indent);
+ }
+
+ iovec[n++] = IOVEC_MAKE_STRING(s);
+ iovec[n++] = IOVEC_MAKE_STRING("\n");
+
+ if (prev_ephemeral && !FLAGS_SET(flags, SHOW_STATUS_EPHEMERAL))
+ iovec[n++] = IOVEC_MAKE_STRING(ANSI_ERASE_TO_END_OF_LINE);
+ prev_ephemeral = FLAGS_SET(flags, SHOW_STATUS_EPHEMERAL) ;
+
+ if (writev(fd, iovec, n) < 0)
+ return -errno;
+
+ return 0;
+}
+
+int status_printf(const char *status, ShowStatusFlags flags, const char *format, ...) {
+ va_list ap;
+ int r;
+
+ assert(format);
+
+ va_start(ap, format);
+ r = status_vprintf(status, flags, format, ap);
+ va_end(ap);
+
+ return r;
+}