clock.c

   1 /*-
   2  * "THE BEER-WARE LICENSE" (Revision 42):
   3  * <tobias.rehbein@web.de> wrote this file. As long as you retain this notice
   4  * you can do whatever you want with this stuff. If we meet some day, and you
   5  * think this stuff is worth it, you can buy me a beer in return.
   6  *                                                              Tobias Rehbein
   7  */
   8
   9 #include <assert.h>
  10 #include <err.h>
  11 #include <stdlib.h>
  12 #include <sysexits.h>
  13 #include <time.h>
  14
  15 #include "buffers.h"
  16 #include "clock.h"
  17
  18 struct clock_context {
  19         char            clock_str[CLOCK_BUFFLEN];
  20 };
  21
  22 struct clock_context *
  23 clock_context_open()
  24 {
  25         struct clock_context *ctx;
  26
  27         if ((ctx = malloc(sizeof(*ctx))) == NULL)
  28                 err(EX_SOFTWARE, "malloc(%d) clock_context", sizeof(struct clock_context));
  29
  30         return (ctx);
  31 }
  32
  33 void
  34 clock_context_close(struct clock_context *ctx)
  35 {
  36         assert(ctx != NULL);
  37
  38         free(ctx);
  39 }
  40
  41 char           *
  42 clock_str(struct clock_context *ctx)
  43 {
  44         time_t          t;
  45         struct tm      *tm;
  46
  47         assert(ctx != NULL);
  48
  49         if (time(&t) == (time_t) (-1))
  50                 errx(EX_SOFTWARE, "time()");
  51         if ((tm = localtime(&t)) == NULL)
  52                 errx(EX_SOFTWARE, "localtime()");
  53
  54         strftime(ctx->clock_str, sizeof(ctx->clock_str), "%c", tm);
  55
  56         return (ctx->clock_str);
  57 }