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  1. #include <limits.h>
  2. #include <locale.h>
  3. #include <stdio.h>
  4. #include <stdlib.h>
  5. #include <string.h>
  6.  
  7. size_t commafmt(char   *buf,            /* Buffer for formatted string  */
  8. 	int     bufsize,        /* Size of buffer               */
  9. 	long    N)              /* Number to convert            */
  10. {
  11. 	const struct lconv *fmt_info = localeconv();
  12. 	int places = 0;
  13. 	int i, len = 1, posn = 1, sign = 1;
  14. 	char *ptr = buf + bufsize - 1;
  15.  
  16. 	if (2 > bufsize)
  17. 	{
  18. 	ABORT:      *buf = '\0';
  19. 		return 0;
  20. 	}
  21.  
  22. 	*ptr-- = '\0';
  23. 	--bufsize;
  24. 	if (0L > N)
  25. 	{
  26. 		sign = -1;
  27. 		N = -N;
  28. 	}
  29.  
  30. 	for (; len <= bufsize; ++len, ++posn)
  31. 	{
  32. 		*ptr-- = (char)((N % 10L) + '0');
  33. 		if (0L == (N /= 10L))
  34. 			break;
  35. 		if (fmt_info->grouping[places] && 0 == (posn % fmt_info->grouping[places]))
  36. 		{
  37. 			if (fmt_info->grouping[places + 1] != '\0')
  38. 				places = fmt_info->grouping[places + 1] == CHAR_MAX ? 0 : places + 1;
  39. 			for (i = 0; fmt_info->thousands_sep[i]; i++, ++len) {
  40. 				*ptr-- = fmt_info->thousands_sep[i];
  41. 				if (len >= bufsize)
  42. 					goto ABORT;
  43. 			}
  44. 		}
  45. 		if (len >= bufsize)
  46. 			goto ABORT;
  47. 	}
  48.  
  49. 	if (0 > sign)
  50. 	{
  51. 		if (len >= bufsize)
  52. 			goto ABORT;
  53. 		for (i = 0; fmt_info->negative_sign[i]; ++i) {
  54. 			*ptr-- = fmt_info->negative_sign[i];
  55. 			if (++len >= bufsize)
  56. 				goto ABORT;
  57. 		}
  58. 	}
  59.  
  60. 	memmove(buf, ++ptr, len + 1);
  61. 	return (size_t)len;
  62. }
  63.  
  64. int main() {
  65. 	char buffer[16];
  66.  
  67. 	setlocale(LC_ALL, "");
  68. 	commafmt(buffer, sizeof(buffer), -12345678);
  69.  
  70. 	printf("%s\n", buffer);
  71. 	return 0;
  72. }
Success #stdin #stdout 0s 11072KB
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Standard input is empty
stdout
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-12,345,678
https://ideone.com/gTv8Z4
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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