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live-bootstrap

Mirror of <https://github.com/fosslinux/live-bootstrap>

checksum-transcriber.c (2324B)

    

  1. /*
  2.  * SPDX-FileCopyrightText: 2022 fosslinux <fosslinux@aussies.space>
  3.  *
  4.  * SPDX-License-Identifier: GPL-3.0-or-later
  5.  */
  7. #include <stdio.h>
  8. #include <string.h>
  9. #include <stdlib.h>
  10. #include <bootstrappable.h>
  11. #include <unistd.h>
  13. #define MAX_STRING 4096
  14. #define MAX_TOKENS 3
  16. char *get_distfiles(char **envp) {
  17. 	char *envvar = "DISTFILES=";
  18. 	int i = 0;
  19. 	while (envp[i] != NULL && strncmp(envp[i], envvar, strlen(envvar)) != 0) i += 1;
  20. 	// Now we have distfiles= - get just the part we want.
  21. 	require(envp[i] != NULL, "Unable to find distfiles environment variable");
  22. 	return envp[i] + strlen(envvar);
  23. }
  25. int main(int argc, char **argv, char **envp) {
  26. 	// Random file things
  27. 	require(argc == 2, "Usage: checksum-transcriber FILENAME");
  28. 	char *input = argv[1];
  29. 	FILE *in = fopen(input, "r");
  30. 	require(in != NULL, "File does not exist");
  31. 	char *output = calloc(MAX_STRING, sizeof(char));
  32. 	require(strcpy(output, input) != NULL, "Failed copying string");
  33. 	require(strcat(output, ".SHA256SUM") != NULL, "Failed concating string");
  34. 	FILE *out = fopen(output, "w+");
  35. 	require(out != NULL, "Failed opening output file");
  37. 	char *orig_line;
  38. 	char *line = calloc(MAX_STRING, sizeof(char));
  39. 	require(line != NULL, "Failed allocating string");
  40. 	char **tokens;
  41. 	char *new_line;
  42. 	char *checksum;
  43. 	char *filename;
  44. 	int i;
  45. 	fgets(line, MAX_STRING, in);
  46. 	while (strlen(line) != 0) {
  47. 		// Split each line into tokens
  48. 		orig_line = line;
  49. 		tokens = calloc(MAX_TOKENS, sizeof(char*));
  50. 		i = 0;
  51. 		while (i < MAX_TOKENS) {
  52. 			tokens[i] = line;
  53. 			new_line = strchr(line, ' ');
  54. 			// Occurs when there are only two tokens
  55. 			if (new_line == NULL) break;
  56. 			line = new_line;
  57. 			line[0] = '\0';
  58. 			line += 1;
  59. 			i += 1;
  60. 		}
  61. 		line = strchr(line, '\n');
  62. 		line[0] = '\0';
  63. 		// Get checksum and filename
  64. 		checksum = tokens[1];
  65. 		if (tokens[2] != NULL) {
  66. 			filename = tokens[2];
  67. 		} else {
  68. 			filename = strrchr(tokens[0], '/');
  69. 			filename += 1;
  70. 		}
  71. 		// Put it all together
  72. 		fputs(checksum, out);
  73. 		fputs("  ", out);
  74. 		fputs(get_distfiles(envp), out);
  75. 		fputc('/', out);
  76. 		fputs(filename, out);
  77. 		fputc('\n', out);
  78. 		// Cleanup
  79. 		i = 0;
  80. 		free(orig_line);
  81. 		free(tokens);
  82. 		line = calloc(MAX_STRING, sizeof(char));
  83. 		require(line != NULL, "Failed allocating string");
  84. 		fgets(line, MAX_STRING, in);
  85. 	}
  87. 	// Clean up
  88. 	fclose(in);
  89. 	fclose(out);
  90. }