ttimeadj.c - filmtools - various tools for photographic film development and darkroom printing
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       ---
       ttimeadj.c (758B)
       ---
            1 #include <stdio.h>
            2 #include <unistd.h>
            3 #include <err.h>
            4 #include <math.h>
            5 
            6 char *argv0;
            7 
            8 static void
            9 usage()
           10 {
           11         printf("usage: %s factor time\n", argv0);
           12         puts("where time is in format MM:SS");
           13 }
           14 
           15 int
           16 main(int argc, char **argv)
           17 {
           18         double factor;
           19         int min, sec, sec_equiv;
           20         argv0 = *argv;
           21 
           22 #ifdef __OpenBSD__
           23         if (pledge("stdio", NULL) == -1)
           24                 err(1, "pledge");
           25 #endif
           26 
           27         if (argc != 3) {
           28                 usage();
           29                 errx(1, "incorrect arguments");
           30         }
           31 
           32         if (sscanf(argv[1], "%lg", &factor) != 1)
           33                 errx(2, "could not parse FACTOR");
           34         if (sscanf(argv[2], "%d:%d", &min, &sec) != 2)
           35                 errx(2, "could not parse TIME in MM:SS format");
           36 
           37         sec_equiv = min * 60 + sec;
           38 
           39         printf("%d:%02d\n",
           40                (int)(sec_equiv*factor/60.0),
           41                (int)(sec_equiv*factor)%60);
           42 
           43         return 0;
           44 }