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	ttimeadj.c - filmtools - various tools for photographic film development and da…
	git clone git://src.adamsgaard.dk/filmtools
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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 }