Initial commit

src/Makefile

@@ -0,0 +1,2 @@
+baps1: main.c
+	$(CC) -Wall -Wextra -lm main.c -o baps1

src/main.c

@@ -0,0 +1,136 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+static char *
+get_tty_name(void)
+{
+  return ttyname(STDIN_FILENO);
+}
+
+static char *
+get_filename(void)
+{
+  char *filename = malloc(sizeof(char) * 255);
+  char *tty = get_tty_name();
+  char *pch;
+
+  while ((pch = strchr(tty, '/')))
+    *pch = '_';
+
+  sprintf(filename, "/tmp/baps1_%u_%s", getuid(), tty);
+
+  return filename;
+}
+
+static time_t
+load_previous_time(char *filename)
+{
+  FILE *timefile = fopen(filename, "r");
+  time_t prev;
+
+  fscanf(timefile, "%ld", &prev);
+  fclose(timefile);
+
+  return prev;
+}
+
+static time_t
+get_previous_time(char *filename)
+{
+  time_t prev;
+
+  if (access(filename, R_OK) == 0) {
+    prev = load_previous_time(filename);
+  }
+  else {
+    prev = 0;
+  }
+
+  return prev;
+}
+
+static int
+get_tty_number(void)
+{
+  char *tty = get_tty_name();
+  char *num = strrchr(tty, '/') + 1;
+
+  return atoi(num);
+}
+
+static char
+get_tty_type(void)
+{
+  char *tty = get_tty_name();
+
+  strtok(tty, "/");             /* dev */
+
+  return strtok(NULL, "/")[0];
+}
+
+static int
+save_current_time(char *filename)
+{
+  FILE *timefile = fopen(filename, "w");
+  time_t now;
+
+  if (!timefile)
+    return 0;
+
+  time(&now);
+  fprintf(timefile, "%ld", now);
+  fclose(timefile);
+
+  return 1;
+}
+
+static void
+print_time_since(time_t lasttime)
+{
+  double h, m, s;
+  time_t now;
+
+  time(&now);
+  s = difftime(now, lasttime);
+
+  if (s >= 60.0) {
+    m = floor(s / 60.0);
+    s -= m * 60;
+
+    if (m >= 60.0) {
+      h = floor(m / 60.0);
+      m -= h * 60;
+
+      printf("%.0lfh", h);
+    }
+
+    printf("%.0lfm", m);
+  }
+
+  printf("%.0lfs", s);
+}
+
+int
+main()
+{
+  char *filename = get_filename();
+  time_t lasttime = get_previous_time(filename);
+
+  printf("%c%d:", get_tty_type(), get_tty_number());
+
+  if (lasttime > 0) {
+    print_time_since(lasttime);
+  }
+  else {
+    puts("new");
+  }
+
+  save_current_time(filename);
+  free(filename);
+
+  return EXIT_SUCCESS;
+}