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cmd-timer

run command at a specific interval git clone https://anongit.hacktivis.me/git/cmd-timer.git

strtodur.c (2331B)

    

  1. // utils-std: Collection of commonly available Unix tools
  2. // SPDX-FileCopyrightText: 2017 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
  3. // SPDX-License-Identifier: MPL-2.0
  5. #define _POSIX_C_SOURCE 200809L
  6. #include "strtodur.h"
  8. #include <assert.h>
  9. #include <ctype.h>
  10. #include <errno.h>  // errno
  11. #include <stdio.h>  // fprintf, perror, sscanf
  12. #include <string.h> // strerror
  14. const char *errstr_nan = "Not a number";
  16. int
  17. strtodur(char *s, struct timespec *dur)
  18. {
  19. 	if(s == 0) return 0;
  21. 	assert(dur);
  23. 	float total = 0.0;
  25. 	while(*s != '\0')
  26. 	{
  27. 		float in = 0.0;
  29. 		if(s[0] != '.' && s[0] != ',')
  30. 		{
  31. 			int parsed = 0;
  32. 			float res = 0.0;
  34. 			errno = 0;
  35. 			if(sscanf(s, "%10f%n", &res, &parsed) < 1)
  36. 			{
  37. 				const char *errstr = errstr_nan;
  38. 				if(errno != 0)
  39. 				{
  40. 					errstr = strerror(errno);
  41. 					errno = 0;
  42. 				}
  44. 				fprintf(
  45. 				    stderr, "%s: error: strtodur failed scanning '%s' as a number: %s\n", argv0, s, errstr);
  46. 				return -1;
  47. 			}
  49. 			in += res;
  50. 			s += parsed;
  51. 		}
  53. 		if((s[0] == '.' || s[0] == ','))
  54. 		{
  55. 			if(s[1] == '\0')
  56. 			{
  57. 				s++;
  58. 				goto dot_skip;
  59. 			}
  61. 			float fraction = 0.0;
  62. 			if(s[0] == ',') s[0] = '.';
  64. 			int parsed = 0;
  66. 			errno = 0;
  67. 			if(sscanf(s, "%10f%n", &fraction, &parsed) < 1)
  68. 			{
  69. 				const char *errstr = errstr_nan;
  70. 				if(errno != 0)
  71. 				{
  72. 					errstr = strerror(errno);
  73. 					errno = 0;
  74. 				}
  76. 				fprintf(stderr,
  77. 				        "%s: error: strtodur failed scanning decimal part '%s' as a number: %s\n",
  78. 				        argv0,
  79. 				        s,
  80. 				        errstr);
  81. 				return -1;
  82. 			}
  84. 			if(parsed == 0) parsed++;
  86. 			in += fraction;
  87. 			s += parsed;
  88. 		}
  90. 		if(s[0] != '\0' && s[0] != ',' && s[0] != '.')
  91. 		{
  92. 			if(s[1] != '\0' && !isdigit(s[1]))
  93. 			{
  94. 				fprintf(stderr,
  95. 				        "%s: error: duration suffix '%s' is too long, should be only one character\n",
  96. 				        argv0,
  97. 				        s);
  98. 				return -1;
  99. 			}
  101. 			switch(s[0])
  102. 			{
  103. 			case 's': // seconds
  104. 				break;
  105. 			case 'm': // minutes
  106. 				in *= 60;
  107. 				break;
  108. 			case 'h': // hours
  109. 				in *= 60 * 60;
  110. 				break;
  111. 			case 'd': // days
  112. 				in *= 24 * 60 * 60;
  113. 				break;
  114. 			default:
  115. 				fprintf(stderr, "%s: error: Unknown duration suffix '%c'\n", argv0, s[0]);
  116. 				return -1;
  117. 			}
  119. 			s++;
  120. 		}
  122. 	dot_skip:
  123. 		total += in;
  124. 	}
  126. 	dur->tv_sec = total;
  127. 	dur->tv_nsec = (total - dur->tv_sec) * 1000000000;
  129. 	return 0;
  130. }