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utils-std

Collection of commonly available Unix tools git clone https://anongit.hacktivis.me/git/utils-std.git

strtodur.c (1795B)

    

  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 <errno.h> // errno
  10. #include <stdio.h> // fprintf, perror, sscanf
  12. int
  13. strtodur(char *s, struct timespec *dur)
  14. {
  15. 	if(s == 0 || s[0] == '\0') return 0;
  17. 	assert(dur);
  19. 	float in = 0.0;
  21. 	if(s[0] != '.' && s[0] != ',')
  22. 	{
  23. 		int parsed = 0;
  24. 		assert(errno == 0);
  25. 		if(sscanf(s, "%10f%n", &in, &parsed) < 1)
  26. 		{
  27. 			if(errno == 0)
  28. 			{
  29. 				fprintf(stderr, "strtodur: error: Not a number: %s\n", s);
  30. 			}
  31. 			else
  32. 			{
  33. 				perror("strtodur: error: sscanf");
  34. 				errno = 0;
  35. 			}
  36. 			return -1;
  37. 		}
  39. 		s += parsed;
  40. 	}
  42. 	if((s[0] == '.' || s[0] == ',') && s[1] != '\0')
  43. 	{
  44. 		float fraction = 0.0;
  45. 		if(s[0] == ',') s[0] = '.';
  47. 		int parsed = 0;
  48. 		assert(errno == 0);
  49. 		if(sscanf(s, "%10f%n", &fraction, &parsed) < 1)
  50. 		{
  51. 			if(errno == 0)
  52. 			{
  53. 				fprintf(stderr, "strtodur: error: Decimal part is not a number: %s\n", s);
  54. 			}
  55. 			else
  56. 			{
  57. 				perror("strtodur: error: sscanf");
  58. 				errno = 0;
  59. 			}
  60. 			return -1;
  61. 		}
  63. 		in += fraction;
  64. 		s += parsed;
  65. 	}
  67. 	if(s[0] != '\0' && s[0] != ',' && s[0] != '.')
  68. 	{
  69. 		if(s[1] != '\0')
  70. 		{
  71. 			fprintf(
  72. 			    stderr, "strtodur: error: suffix '%s' is too long, should be only one character\n", s);
  73. 			return -1;
  74. 		}
  76. 		switch(s[0])
  77. 		{
  78. 		case 's': // seconds
  79. 			break;
  80. 		case 'm': // minutes
  81. 			in *= 60;
  82. 			break;
  83. 		case 'h': // hours
  84. 			in *= 60 * 60;
  85. 			break;
  86. 		case 'd': // days
  87. 			in *= 24 * 60 * 60;
  88. 			break;
  89. 		default:
  90. 			fprintf(stderr, "strtodur: error: Unknown suffix '%c'\n", s[0]);
  91. 			return -1;
  92. 		}
  93. 	}
  95. 	dur->tv_sec = in;
  96. 	dur->tv_nsec = (in - dur->tv_sec) * 1000000000;
  98. 	return 0;
  99. }