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utils-std

Collection of commonly available Unix tools

fs.c (1656B)

    

  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. // For copy_file_range
  6. #define _GNU_SOURCE     // musl, glibc
  7. #define _DEFAULT_SOURCE // FreeBSD
  9. #include "./fs.h"
  11. #include <errno.h>
  12. #include <stdio.h>  // BUFSIZ
  13. #include <string.h> // strrchr
  14. #include <unistd.h> // copy_file_range
  16. char *
  17. static_basename(char *path)
  18. {
  19. 	char *sep = strrchr(path, '/');
  21. 	return (sep == NULL) ? path : sep + 1;
  22. }
  24. char *
  25. path_split_static(char *path, bool trim)
  26. {
  27. 	char *child = NULL;
  28. 	size_t path_len = strlen(path);
  30. 	// delete trailing slashes
  31. 	if(trim)
  32. 		for(int i = path_len - 1; i > 0 && path[i] == '/'; i--)
  33. 			path[i] = 0;
  35. 	for(int i = path_len - 1; i > 0; i--)
  36. 		if(path[i] == '/')
  37. 		{
  38. 			path[i] = 0;
  39. 			child = &path[i + 1];
  40. 			break;
  41. 		}
  43. 	return child;
  44. }
  46. #ifndef MIN
  47. #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  48. #endif
  50. int
  51. manual_file_copy(int fd_in, int fd_out, off_t len, int flags)
  52. {
  53. 	do
  54. 	{
  55. 		char buf[BUFSIZ];
  57. 		ssize_t nread = read(fd_in, buf, MIN(BUFSIZ, len));
  58. 		if(nread < 0) return nread;
  60. 		ssize_t nwrite = write(fd_out, buf, (size_t)nread);
  61. 		if(nwrite < 0) return nwrite;
  63. 		len -= nwrite;
  64. 	} while(len > 0);
  66. 	return 0;
  67. }
  69. #ifdef HAS_COPY_FILE_RANGE
  70. int
  71. auto_file_copy(int fd_in, int fd_out, off_t len, int flags)
  72. {
  73. 	off_t ret = -1;
  74. 	do
  75. 	{
  76. 		ret = copy_file_range(fd_in, NULL, fd_out, NULL, len, 0);
  77. 		if(ret < 0)
  78. 		{
  79. 			if(errno == EXDEV)
  80. 			{
  81. 				errno = 0;
  82. 				return manual_file_copy(fd_in, fd_out, len, flags);
  83. 			}
  85. 			return ret;
  86. 		}
  87. 		len -= ret;
  88. 	} while(len > 0 && ret > 0);
  90. 	return 0;
  91. }
  92. #endif