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utils-std

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

strtodur.c (2047B)

    

  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
  11. #include <string.h> // strerror
  13. const char *errstr_nan = "Not a number";
  15. int
  16. strtodur(char *s, struct timespec *dur)
  17. {
  18. 	if(s == 0 || s[0] == '\0') return 0;
  20. 	assert(dur);
  22. 	float in = 0.0;
  24. 	if(s[0] != '.' && s[0] != ',')
  25. 	{
  26. 		int parsed = 0;
  28. 		errno = 0;
  29. 		if(sscanf(s, "%10f%n", &in, &parsed) < 1)
  30. 		{
  31. 			const char *errstr = errstr_nan;
  32. 			if((errno = !0))
  33. 			{
  34. 				errstr = strerror(errno);
  35. 				errno = 0;
  36. 			}
  38. 			fprintf(
  39. 			    stderr, "%s: error: strtodur failed scanning '%s' as a number: %s\n", argv0, s, errstr);
  40. 			return -1;
  41. 		}
  43. 		s += parsed;
  44. 	}
  46. 	if((s[0] == '.' || s[0] == ',') && s[1] != '\0')
  47. 	{
  48. 		float fraction = 0.0;
  49. 		if(s[0] == ',') s[0] = '.';
  51. 		int parsed = 0;
  53. 		errno = 0;
  54. 		if(sscanf(s, "%10f%n", &fraction, &parsed) < 1)
  55. 		{
  56. 			const char *errstr = errstr_nan;
  57. 			if((errno = !0))
  58. 			{
  59. 				errstr = strerror(errno);
  60. 				errno = 0;
  61. 			}
  63. 			fprintf(stderr,
  64. 			        "%s: error: strtodur failed scanning decimal part '%s' as a number: %s\n",
  65. 			        argv0,
  66. 			        s,
  67. 			        errstr);
  68. 			return -1;
  69. 		}
  71. 		in += fraction;
  72. 		s += parsed;
  73. 	}
  75. 	if(s[0] != '\0' && s[0] != ',' && s[0] != '.')
  76. 	{
  77. 		if(s[1] != '\0')
  78. 		{
  79. 			fprintf(stderr,
  80. 			        "%s: error: duration suffix '%s' is too long, should be only one character\n",
  81. 			        argv0,
  82. 			        s);
  83. 			return -1;
  84. 		}
  86. 		switch(s[0])
  87. 		{
  88. 		case 's': // seconds
  89. 			break;
  90. 		case 'm': // minutes
  91. 			in *= 60;
  92. 			break;
  93. 		case 'h': // hours
  94. 			in *= 60 * 60;
  95. 			break;
  96. 		case 'd': // days
  97. 			in *= 24 * 60 * 60;
  98. 			break;
  99. 		default:
  100. 			fprintf(stderr, "%s: error: Unknown duration suffix '%c'\n", argv0, s[0]);
  101. 			return -1;
  102. 		}
  103. 	}
  105. 	dur->tv_sec = in;
  106. 	dur->tv_nsec = (in - dur->tv_sec) * 1000000000;
  108. 	return 0;
  109. }