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utils-extra

Collection of extra tools for Unixes

humanize.c (2635B)

    

  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. 	unsigned quotient = 0;
  25. 	while(num > div && quotient < PFX)
  26. 	{
  27. 		num /= div;
  28. 		quotient += 1;
  29. 	}
  31. 	printf("%Lg %s\n", num, prefixes[quotient]);
  32. }
  34. static void
  35. human_time(long int epoch)
  36. {
  37. 	int year = 0, month = 0, mday = 0, hour = 0, min = 0, sec = 0;
  39. 	year = epoch / 31556926; // round(year)
  40. 	epoch %= 31556926;
  41. 	month = epoch / 2629743; // year/12
  42. 	epoch %= 2629743;
  43. 	mday = epoch / 86400;
  44. 	epoch %= 86400;
  46. 	hour = epoch / 3600;
  47. 	epoch %= 3600;
  48. 	min = epoch / 60;
  49. 	epoch %= 60;
  50. 	sec = epoch;
  52. 	if(year > 0) printf("%dY ", year);
  53. 	if(month > 0) printf("%dM ", month);
  54. 	if(mday > 0) printf("%dD ", mday);
  55. 	if(hour > 0) printf("%dh ", hour);
  56. 	if(min > 0) printf("%dm ", min);
  57. 	if(sec > 0) printf("%ds", sec);
  58. 	printf("\n");
  59. }
  61. static void
  62. usage()
  63. {
  64. 	fprintf(stderr, "Usage: humanize [-bdt] number\n");
  65. }
  67. int
  68. main(int argc, char *argv[])
  69. {
  70. 	// default to -d
  71. 	bool iec = false, time = false;
  73. 	int c = -1;
  74. 	while((c = getopt(argc, argv, ":bdt")) != -1)
  75. 	{
  76. 		switch(c)
  77. 		{
  78. 		case 'b':
  79. 			iec = true;
  80. 			break;
  81. 		case 'd':
  82. 			iec = false;
  83. 			break;
  84. 		case 't':
  85. 			time = true;
  86. 			break;
  87. 		case ':':
  88. 			fprintf(stderr, "humanize: Error: Missing operand for option: '-%c'\n", optopt);
  89. 			usage();
  90. 			return 1;
  91. 		case '?':
  92. 			fprintf(stderr, "humanize: Error: Unrecognised option: '-%c'\n", optopt);
  93. 			usage();
  94. 			return 1;
  95. 		}
  96. 	}
  98. 	argc -= optind;
  99. 	argv += optind;
  101. 	if(argc < 1)
  102. 	{
  103. 		usage();
  104. 		return 1;
  105. 	}
  107. 	for(int argi = 0; argi < argc; argi++)
  108. 	{
  109. 		// Keep sscanf here for easier error handling, rest being pure math
  110. 		if(time)
  111. 		{
  112. 			long int epoch = 0;
  114. 			if(sscanf(argv[argi], "%ld", &epoch) < 1)
  115. 			{
  116. 				perror("humanize: sscanf");
  117. 				return 1;
  118. 			}
  120. 			human_time(epoch);
  121. 		}
  122. 		else
  123. 		{
  124. 			long double num = 0;
  126. 			if(sscanf(argv[argi], "%Lg", &num) < 1)
  127. 			{
  128. 				perror("humanize: sscanf");
  129. 				return 1;
  130. 			}
  132. 			human_num(num, iec);
  133. 		}
  134. 	}
  136. 	return 0;
  137. }