common progress display support

[git.git] / progress.c

diff --git a/progress.c b/progress.c
new file mode 100644 (file)
index 0000000..702e116
--- /dev/null
+++ b/progress.c
@@ -0,0 +1,68 @@
+#include "git-compat-util.h"
+#include "progress.h"
+
+static volatile sig_atomic_t progress_update;
+
+static void progress_interval(int signum)
+{
+       progress_update = 1;
+}
+
+static void set_progress_signal(void)
+{
+       struct sigaction sa;
+       struct itimerval v;
+
+       memset(&sa, 0, sizeof(sa));
+       sa.sa_handler = progress_interval;
+       sigemptyset(&sa.sa_mask);
+       sa.sa_flags = SA_RESTART;
+       sigaction(SIGALRM, &sa, NULL);
+
+       v.it_interval.tv_sec = 1;
+       v.it_interval.tv_usec = 0;
+       v.it_value = v.it_interval;
+       setitimer(ITIMER_REAL, &v, NULL);
+}
+
+static void clear_progress_signal(void)
+{
+       struct itimerval v = {{0,},};
+       setitimer(ITIMER_REAL, &v, NULL);
+       signal(SIGALRM, SIG_IGN);
+       progress_update = 0;
+}
+
+int display_progress(struct progress *progress, unsigned n)
+{
+       if (progress->total) {
+               unsigned percent = n * 100 / progress->total;
+               if (percent != progress->last_percent || progress_update) {
+                       progress->last_percent = percent;
+                       fprintf(stderr, "%s%4u%% (%u/%u) done\r",
+                               progress->msg, percent, n, progress->total);
+                       progress_update = 0;
+                       return 1;
+               }
+       } else if (progress_update) {
+               fprintf(stderr, "%s%u\r", progress->msg, n);
+               progress_update = 0;
+               return 1;
+       }
+       return 0;
+}
+
+void start_progress(struct progress *progress, const char *msg, unsigned total)
+{
+       progress->msg = msg;
+       progress->total = total;
+       progress->last_percent = -1;
+       set_progress_signal();
+}
+
+void stop_progress(struct progress *progress)
+{
+       clear_progress_signal();
+       if (progress->total)
+               fputc('\n', stderr);
+}