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  1. #include <stdio.h>
  2. #include <time.h> // use for test. not available on IDE
  3.  
  4. time_t getElapsedSecond(int yyyy, int mm, int dd, int hh, int nn, int ss){
  5.     struct tm workdt;
  6.     workdt.tm_isdst = -1; // summer time flag
  7.     workdt.tm_year = yyyy - 1900;
  8.     workdt.tm_mon = mm - 1;
  9.     workdt.tm_mday = dd;
  10.     workdt.tm_hour = hh;
  11.     workdt.tm_min = nn;
  12.     workdt.tm_sec = ss;
  13.     return mktime(&workdt);
  14. }
  15.  
  16. void getDateTimeString(time_t srcdt, char *dstPtr)
  17. {
  18.     if (dstPtr == NULL) {
  19.         return; // error
  20.     }
  21.     struct tm *workdt;
  22.     workdt = localtime(&srcdt); 
  23.     workdt->tm_year = workdt->tm_year + 1900;
  24.     sprintf(dstPtr, "%04d/%02d/%02d %02d:%02d:%02d", 
  25.         workdt->tm_year, workdt->tm_mon + 1, workdt->tm_mday, 
  26.         workdt->tm_hour, workdt->tm_min, workdt->tm_sec
  27.     );
  28. }
  29.  
  30. typedef struct {
  31. 	unsigned int OI; // [s]
  32. 	unsigned int MI; // [s]
  33. 	unsigned int W; // [s]
  34. 	unsigned int R; // [s]
  35. 	unsigned int N; // [s]
  36. } SETTING_t;
  37.  
  38. time_t getNextWtime(time_t torigin, time_t tnow, SETTING_t *setPtr)
  39. {
  40. 	if (setPtr == NULL) {
  41. 		return 0; // error // TOOD: 0z > use error value for time_t
  42. 	}
  43. 	// case 1: (now - origin) % OI == 0
  44. 	unsigned long A = (tnow - torigin) / setPtr->OI;
  45. 	if ((tnow - torigin) % setPtr->OI == 0) {
  46. 		return torigin + (A + 1) * setPtr->OI;
  47. 	}
  48.  
  49. 	// case 2: (now - origin) % OI != 0
  50.  
  51. 	//   case 2-a: (now - A*OI) % MI == 0
  52.  
  53. 	//   case 2-b: (now - A*OI) % MI != 0
  54.  
  55. 	return 0; // TODO: 0z > remove after debug
  56. }
  57.  
  58. void AssertCheck(time_t torigin, time_t tnow, time_t tnextWans, SETTING_t *setPtr)
  59. {
  60. 	char szbuf[30];
  61. 	if (setPtr == NULL) {
  62. 		return; // error
  63. 	}
  64. 	time_t tnextWres = getNextWtime(torigin, tnow, setPtr);
  65.  
  66.     getDateTimeString(tnow, szbuf);
  67. 	printf("%s - ", szbuf);
  68.     getDateTimeString(tnextWres, szbuf);
  69. 	printf("%s:", szbuf);
  70. 	printf("%c", (tnextWres == tnextWans) ? 'T' : 'F');
  71. 	printf("\r\n");
  72. }
  73.  
  74. void Test_group_run()
  75. {
  76. 	time_t torigin = getElapsedSecond(2017, 8, 2, 13, 48, 55);
  77. 	SETTING_t setting = { 3600, 600, 60, 5, 3 }; // OI, MI, W, R, N
  78.  
  79. 	// case (2)
  80. 	AssertCheck(torigin,
  81. 		        getElapsedSecond(2017, 8, 2, 13, 48, 55),
  82.            	    getElapsedSecond(2017, 8, 2, 14, 48, 55),
  83. 	            &setting);
  84.  
  85. }
  86.  
  87. int main(void) {
  88. 	Test_group_run();
  89.  
  90. 	return 0;
  91. }
Success #stdin #stdout 0s 9424KB
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2017/08/02 13:48:55 - 2017/08/02 14:48:55:T
https://ideone.com/YV3IdY
C > timer event > double interval [TODO: stdint.h]
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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