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error-standalone

standalone <error.h> implementation intended for muslgit clone https://anongit.hacktivis.me/git/error-standalone.git/

error.c (1679B)

    

  1. // Copyright © 2024 Haelwenn (lanodan) Monnier <contact@hacktivis.me>
  2. // SPDX-License-Identifier: MIT
  3. #define _GNU_SOURCE // program_invocation_name
  5. #include <errno.h>
  6. #include <stdarg.h>
  7. #include <stdio.h>
  8. #include <stdlib.h>
  9. #include <string.h>
  11. #include "error.h"
  13. unsigned int error_message_count = 0;
  14. void (*error_print_progname)(void) = NULL;
  15. int error_one_per_line = 0;
  17. void
  18. error(int status, int errnum, const char *format, ...)
  19. {
  20. 	fflush(stdout);
  22. 	if(error_print_progname != NULL)
  23. 	{
  24. 		(*error_print_progname) ();
  25. 	}
  26. 	else
  27. 	{
  28. 		fprintf(stderr, "%s:", program_invocation_name);
  29. 	}
  31. 	va_list args;
  32. 	va_start(args, format);
  33. 	vfprintf(stderr, format, args);
  34. 	va_end(args);
  36. 	if(errnum != 0)
  37. 		fprintf(stderr, ": %s", strerror(errnum));
  39. 	putc('\n', stderr);
  41. 	error_message_count++;
  43. 	if(status != 0) exit(status);
  44. }
  46. void
  47. error_at_line(int status, int errnum, const char *filename, unsigned int linenum, const char *format, ...)
  48. {
  49. 	if(error_one_per_line != 0)
  50. 	{
  51. 		static const char *prev_filename;
  52. 		static unsigned int prev_linenum;
  54. 		if(prev_linenum == linenum &&
  55. 			(prev_filename == filename || strcmp(prev_filename, filename) == 0)
  56. 		) return; // already printed, skip
  58. 		prev_filename = filename;
  59. 		prev_linenum = linenum;
  60. 	}
  62. 	fflush(stdout);
  64. 	if(error_print_progname != NULL)
  65. 	{
  66. 		(*error_print_progname) ();
  67. 	}
  68. 	else
  69. 	{
  70. 		fprintf(stderr, "%s:", program_invocation_name);
  71. 	}
  73. 	fprintf(stderr, " %s:%d: ", filename, linenum);
  75. 	va_list args;
  76. 	va_start(args, format);
  77. 	vfprintf(stderr, format, args);
  78. 	va_end(args);
  80. 	if(errnum != 0)
  81. 		fprintf(stderr, ": %s", strerror(errnum));
  83. 	putc('\n', stderr);
  85. 	error_message_count++;
  87. 	if(status != 0) exit(status);
  88. }