logo

utils-extra

Collection of extra tools for Unixes git clone https://anongit.hacktivis.me/git/utils-extra.git/

humanize.c (2835B)

    

  1. // utils-extra: Collection of extra tools for Unixes
  2. // SPDX-FileCopyrightText: 2017-2023 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
  3. // SPDX-License-Identifier: MPL-2.0
  5. #define _POSIX_C_SOURCE 200809L
  7. #include <errno.h>   // EINVAL, ERANGE
  8. #include <limits.h>  // LLONG_MIN, LLONG_MAX
  9. #include <stdbool.h> // bool
  10. #include <stdio.h>   // fprintf, perror, sscanf
  11. #include <unistd.h>  // opt*, getopt
  13. static void
  14. human_num(long double num, bool iec)
  15. {
  16. #define PFX 11
  17. 	char *si_prefixes[PFX]  = {"", "k", "M", "G", "T", "P", "E", "Z", "Y", "R", "Q"};
  18. 	char *iec_prefixes[PFX] = {
  19. 	    "B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB", "ZiB", "YiB", "RiB", "QiB"};
  21. 	unsigned div    = iec ? 1024 : 1000;
  22. 	char **prefixes = iec ? iec_prefixes : si_prefixes;
  24. 	bool neg = false;
  25. 	if(num < 0)
  26. 	{
  27. 		neg = true;
  28. 		num = -num;
  29. 	}
  31. 	unsigned quotient = 0;
  32. 	while(num > div && quotient < (PFX - 1))
  33. 	{
  34. 		num /= div;
  35. 		quotient += 1;
  36. 	}
  38. 	if(neg) num = -num;
  40. 	// %g to avoid decimal separator when possible, %f to avoid %e exponent form
  41. 	printf((num > div ? "%Lf %s\n" : "%Lg %s\n"), num, prefixes[quotient]);
  42. }
  44. static void
  45. human_time(long int epoch)
  46. {
  47. 	int year = 0, month = 0, mday = 0, hour = 0, min = 0, sec = 0;
  49. 	year = epoch / 31556926; // round(year)
  50. 	epoch %= 31556926;
  51. 	month = epoch / 2629743; // year/12
  52. 	epoch %= 2629743;
  53. 	mday = epoch / 86400;
  54. 	epoch %= 86400;
  56. 	hour = epoch / 3600;
  57. 	epoch %= 3600;
  58. 	min = epoch / 60;
  59. 	epoch %= 60;
  60. 	sec = epoch;
  62. 	if(year > 0) printf("%dY ", year);
  63. 	if(month > 0) printf("%dM ", month);
  64. 	if(mday > 0) printf("%dD ", mday);
  65. 	if(hour > 0) printf("%dh ", hour);
  66. 	if(min > 0) printf("%dm ", min);
  67. 	if(sec > 0) printf("%ds", sec);
  68. 	printf("\n");
  69. }
  71. static void
  72. usage()
  73. {
  74. 	fprintf(stderr, "Usage: humanize [-bdt] number\n");
  75. }
  77. int
  78. main(int argc, char *argv[])
  79. {
  80. 	// default to -d
  81. 	bool iec = false, time = false;
  83. 	int c = -1;
  84. 	while((c = getopt(argc, argv, ":bdt")) != -1)
  85. 	{
  86. 		switch(c)
  87. 		{
  88. 		case 'b':
  89. 			iec = true;
  90. 			break;
  91. 		case 'd':
  92. 			iec = false;
  93. 			break;
  94. 		case 't':
  95. 			time = true;
  96. 			break;
  97. 		case ':':
  98. 			fprintf(stderr, "humanize: Error: Missing operand for option: '-%c'\n", optopt);
  99. 			usage();
  100. 			return 1;
  101. 		case '?':
  102. 			fprintf(stderr, "humanize: Error: Unrecognised option: '-%c'\n", optopt);
  103. 			usage();
  104. 			return 1;
  105. 		}
  106. 	}
  108. 	argc -= optind;
  109. 	argv += optind;
  111. 	if(argc < 1)
  112. 	{
  113. 		usage();
  114. 		return 1;
  115. 	}
  117. 	for(int argi = 0; argi < argc; argi++)
  118. 	{
  119. 		// Keep sscanf here for easier error handling, rest being pure math
  120. 		if(time)
  121. 		{
  122. 			long int epoch = 0;
  124. 			if(sscanf(argv[argi], "%ld", &epoch) < 1)
  125. 			{
  126. 				perror("humanize: sscanf");
  127. 				return 1;
  128. 			}
  130. 			human_time(epoch);
  131. 		}
  132. 		else
  133. 		{
  134. 			long double num = 0;
  136. 			if(sscanf(argv[argi], "%Lg", &num) < 1)
  137. 			{
  138. 				perror("humanize: sscanf");
  139. 				return 1;
  140. 			}
  142. 			human_num(num, iec);
  143. 		}
  144. 	}
  146. 	return 0;
  147. }