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  1. #include <stdio.h>
  2. #include <assert.h>
  3. #include <stdlib.h>
  4. #include <errno.h>
  5.  
  6. struct Foo
  7. {
  8. 	int a;
  9. 	int b;
  10. 	int c;
  11.  
  12. 	int state;
  13. };
  14.  
  15. void on_number(void *opaque, long value)
  16. {
  17. 	assert(opaque);
  18. 	struct Foo* ctx = (struct Foo*)(opaque);
  19. 	if (ctx->state == 0)
  20. 		ctx->a = value;
  21. 	if (ctx->state == 1)
  22. 		ctx->b = value;
  23. 	if (ctx->state == 2)
  24. 		ctx->c = value;
  25. 	ctx->state++;
  26. }
  27.  
  28. void extract_numbers(const char *str, int base, void *opaque, void (*on_number_cb)(void*,long))
  29. {
  30. 	while (*str) 
  31. 	{
  32. 		char *enptr = NULL;
  33. 		long  value = strtol(str, &enptr, base);
  34. 		if (str == enptr) 
  35. 		{
  36. 			str++;
  37. 			continue;
  38. 		}
  39. 		else
  40. 		{
  41. 			str = enptr;
  42. 		}
  43.  
  44. 		if (on_number_cb)
  45. 			on_number_cb(opaque, value);
  46. 	}
  47. }
  48.  
  49. int main(void) 
  50. {	
  51. 	const char* str = "5 used hard 4 label 10";
  52. 	struct Foo  ctx = {0};
  53.  
  54. 	extract_numbers(str, 10, &ctx, on_number);
  55.  
  56. 	printf("ctx.a = %d, ctx.b = %d, ctx.c = %d\n", ctx.a, ctx.b, ctx.c);
  57.  
  58. 	return 0;
  59. }
  60.  
Success #stdin #stdout 0s 2156KB
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Standard input is empty
stdout
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ctx.a = 5, ctx.b = 4, ctx.c = 10
https://ideone.com/w4Ke4Y
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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