add directory study

2024-02-19 00:25:23 -05:00
parent b1306b38b1
commit f3774e2f8c
4001 changed files with 2285787 additions and 0 deletions
--- a/study/linux-travel/MINIX-1.5/1.5/Source/commands/date.c
+++ b/study/linux-travel/MINIX-1.5/1.5/Source/commands/date.c
@@ -0,0 +1,113 @@
+/* date - print or set time and date		Author: Jan Looyen */
+
+#include <sys/types.h>
+#include <stddef.h>
+#include <time.h>
+#include <stdio.h>
+
+#define	MIN	60L		/* # seconds in a minute */
+#define	HOUR	(60 * MIN)	/* # seconds in an hour */
+#define	DAY	(24 * HOUR)	/* # seconds in a day */
+#define	YEAR	(365 * DAY)	/* # seconds in a year */
+
+main(argc, argv)
+int argc;
+char **argv;
+{
+  int qflag;
+  long t;
+  char time_buf[15];
+
+  if (argc > 2) usage();
+  if (argc == 2) {
+	if (*argv[1] == '-' && (argv[1][1] | 0x60) == 'q') {
+		freopen("/dev/tty0", "r", stdin);
+		printf("\nPlease enter date: MMDDYYhhmmss. Then hit the RETURN key.\n");
+		gets(time_buf);
+		set_time(time_buf);
+	} else
+		set_time(argv[1]);
+  }
+  time(&t);
+  printf("%s", ctime(&t));
+  exit(0);
+}
+
+
+set_time(t)
+char *t;
+{
+  char *tp;
+  long ct;
+  int len;
+  static int days_per_month[] = {
+		      31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+  };
+  struct tm *p;
+
+  time(&ct);
+  p = localtime(&ct);
+  p->tm_year -= 70;
+  p->tm_mon++;
+  len = strlen(t);
+  if (len != 12 && len != 10 && len != 6 && len != 4) usage();
+  tp = t;
+  while (*tp)
+	if (!isdigit(*tp++)) bad();
+  if (len == 6 || len == 12) p->tm_sec = conv(&tp, 59);
+  p->tm_min = conv(&tp, 59);
+  p->tm_hour = conv(&tp, 23);
+  if (len == 12 || len == 10) {
+	p->tm_year = conv(&tp, 99);
+	p->tm_mday = conv(&tp, 31);
+	p->tm_mon = conv(&tp, 12);
+	p->tm_year -= 70;
+	if (p->tm_year < 0) p->tm_year += 100;
+  }
+  ct = p->tm_year * YEAR;
+  ct += ((p->tm_year + 1) / 4) * DAY;
+  days_per_month[1] = 28;
+  if (((p->tm_year + 2) % 4) == 0) days_per_month[1]++;
+  len = 0;
+  p->tm_mon--;
+  while (len < p->tm_mon) ct += days_per_month[len++] * DAY;
+  ct += --p->tm_mday * DAY;
+  ct += p->tm_hour * HOUR;
+  ct += p->tm_min * MIN;
+  ct += p->tm_sec;
+  if (stime(&ct)) fprintf(stderr, "Set date not allowed\n");
+}
+
+conv(ptr, max)
+char **ptr;
+int max;
+{
+  int buf;
+
+  *ptr -= 2;
+  buf = atoi(*ptr);
+  **ptr = 0;
+  if (buf < 0 || buf > max) bad();
+  return(buf);
+}
+
+bad()
+{
+  fprintf(stderr, "Date: bad conversion\n");
+  exit(1);
+}
+
+usage()
+{
+  fprintf(stderr, "Usage: date [-q] [[MMDDYY]hhmm[ss]]\n");
+  exit(1);
+}
+
+isdigit(c)
+char c;
+{
+  if (c >= '0' && c <= '9')
+	return(1);
+  else
+	return(0);
+}