1 3b0f3d61 2020-01-22 neels /* Commandline diff utility to test diff implementations. */
  2 3b0f3d61 2020-01-22 neels /*
  3 3b0f3d61 2020-01-22 neels  * Copyright (c) 2018 Martin Pieuchot
  4 3b0f3d61 2020-01-22 neels  * Copyright (c) 2020 Neels Hofmeyr <neels@hofmeyr.de>
  5 3b0f3d61 2020-01-22 neels  *
  6 3b0f3d61 2020-01-22 neels  * Permission to use, copy, modify, and distribute this software for any
  7 3b0f3d61 2020-01-22 neels  * purpose with or without fee is hereby granted, provided that the above
  8 3b0f3d61 2020-01-22 neels  * copyright notice and this permission notice appear in all copies.
  9 3b0f3d61 2020-01-22 neels  *
 10 3b0f3d61 2020-01-22 neels  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 11 3b0f3d61 2020-01-22 neels  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 12 3b0f3d61 2020-01-22 neels  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 13 3b0f3d61 2020-01-22 neels  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 14 3b0f3d61 2020-01-22 neels  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 15 3b0f3d61 2020-01-22 neels  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 16 3b0f3d61 2020-01-22 neels  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 17 3b0f3d61 2020-01-22 neels  */
 18 3b0f3d61 2020-01-22 neels 
 19 3b0f3d61 2020-01-22 neels #include <sys/mman.h>
 20 3b0f3d61 2020-01-22 neels #include <sys/stat.h>
 21 3b0f3d61 2020-01-22 neels 
 22 3b0f3d61 2020-01-22 neels #include <err.h>
 23 3b0f3d61 2020-01-22 neels #include <fcntl.h>
 24 3b0f3d61 2020-01-22 neels #include <inttypes.h>
 25 3b0f3d61 2020-01-22 neels #include <stdio.h>
 26 3b0f3d61 2020-01-22 neels #include <stdlib.h>
 27 3b0f3d61 2020-01-22 neels #include <unistd.h>
 28 3b0f3d61 2020-01-22 neels 
 29 3b0f3d61 2020-01-22 neels #ifdef __linux__
 30 3b0f3d61 2020-01-22 neels /* stupid shims to compile and test on linux */
 31 3b0f3d61 2020-01-22 neels #define __dead
 32 3b0f3d61 2020-01-22 neels 
 33 3b0f3d61 2020-01-22 neels static const char *getprogname()
 34 3b0f3d61 2020-01-22 neels {
 35 3b0f3d61 2020-01-22 neels 	return "diff";
 36 3b0f3d61 2020-01-22 neels }
 37 3b0f3d61 2020-01-22 neels #endif
 38 3b0f3d61 2020-01-22 neels 
 39 3b0f3d61 2020-01-22 neels __dead void	 usage(void);
 40 3b0f3d61 2020-01-22 neels int		 diffreg(char *, char *, int);
 41 3b0f3d61 2020-01-22 neels char		*mmapfile(const char *, struct stat *);
 42 3b0f3d61 2020-01-22 neels 
 43 3b0f3d61 2020-01-22 neels __dead void
 44 3b0f3d61 2020-01-22 neels usage(void)
 45 3b0f3d61 2020-01-22 neels {
 46 3b0f3d61 2020-01-22 neels 	fprintf(stderr, "usage: %s file1 file2\n", getprogname());
 47 3b0f3d61 2020-01-22 neels 	exit(1);
 48 3b0f3d61 2020-01-22 neels }
 49 3b0f3d61 2020-01-22 neels 
 50 3b0f3d61 2020-01-22 neels int
 51 3b0f3d61 2020-01-22 neels main(int argc, char *argv[])
 52 3b0f3d61 2020-01-22 neels {
 53 3b0f3d61 2020-01-22 neels 	int ch;
 54 3b0f3d61 2020-01-22 neels 
 55 3b0f3d61 2020-01-22 neels 	while ((ch = getopt(argc, argv, "")) != -1) {
 56 3b0f3d61 2020-01-22 neels 		switch (ch) {
 57 3b0f3d61 2020-01-22 neels 		default:
 58 3b0f3d61 2020-01-22 neels 			usage();
 59 3b0f3d61 2020-01-22 neels 		}
 60 3b0f3d61 2020-01-22 neels 	}
 61 3b0f3d61 2020-01-22 neels 
 62 3b0f3d61 2020-01-22 neels 	argc -= optind;
 63 3b0f3d61 2020-01-22 neels 	argv += optind;
 64 3b0f3d61 2020-01-22 neels 
 65 3b0f3d61 2020-01-22 neels 	if (argc != 2)
 66 3b0f3d61 2020-01-22 neels 		usage();
 67 3b0f3d61 2020-01-22 neels 
 68 3b0f3d61 2020-01-22 neels 	return diffreg(argv[0], argv[1], 0);
 69 3b0f3d61 2020-01-22 neels }
 70 3b0f3d61 2020-01-22 neels 
 71 3b0f3d61 2020-01-22 neels #include <diff/diff_main.h>
 72 3b0f3d61 2020-01-22 neels #include <diff/diff_output.h>
 73 3b0f3d61 2020-01-22 neels 
 74 3b0f3d61 2020-01-22 neels const struct diff_algo_config myers, patience, myers_divide;
 75 3b0f3d61 2020-01-22 neels 
 76 3b0f3d61 2020-01-22 neels const struct diff_algo_config myers = (struct diff_algo_config){
 77 3b0f3d61 2020-01-22 neels 	.impl = diff_algo_myers,
 78 3b0f3d61 2020-01-22 neels 	.permitted_state_size = 104 * sizeof(int),
 79 3b0f3d61 2020-01-22 neels 	.fallback_algo = &patience,
 80 3b0f3d61 2020-01-22 neels };
 81 3b0f3d61 2020-01-22 neels 
 82 3b0f3d61 2020-01-22 neels const struct diff_algo_config patience = (struct diff_algo_config){
 83 3b0f3d61 2020-01-22 neels 	.impl = diff_algo_patience,
 84 3b0f3d61 2020-01-22 neels 	.inner_algo = &patience,	// After subdivision, do Patience again.
 85 3b0f3d61 2020-01-22 neels 	.fallback_algo = &myers_divide, // If subdivision failed, do Myers Divide et Impera.
 86 3b0f3d61 2020-01-22 neels };
 87 3b0f3d61 2020-01-22 neels 
 88 3b0f3d61 2020-01-22 neels const struct diff_algo_config myers_divide = (struct diff_algo_config){
 89 3b0f3d61 2020-01-22 neels 	.impl = diff_algo_myers_divide,
 90 3b0f3d61 2020-01-22 neels 	.inner_algo = &myers,		// When division succeeded, start from the top.
 91 3b0f3d61 2020-01-22 neels 					// (fallback_algo = NULL implies diff_algo_none).
 92 3b0f3d61 2020-01-22 neels };
 93 3b0f3d61 2020-01-22 neels 
 94 3b0f3d61 2020-01-22 neels const struct diff_config diff_config = {
 95 3b0f3d61 2020-01-22 neels 	.atomize_func = diff_atomize_text_by_line,
 96 3b0f3d61 2020-01-22 neels 	.algo = &myers,
 97 3b0f3d61 2020-01-22 neels };
 98 3b0f3d61 2020-01-22 neels 
 99 3b0f3d61 2020-01-22 neels int
100 3b0f3d61 2020-01-22 neels diffreg(char *file1, char *file2, int flags)
101 3b0f3d61 2020-01-22 neels {
102 3b0f3d61 2020-01-22 neels 	char *str1, *str2;
103 3b0f3d61 2020-01-22 neels 	struct stat st1, st2;
104 3b0f3d61 2020-01-22 neels 	struct diff_input_info info = {
105 3b0f3d61 2020-01-22 neels 		.left_path = file1,
106 3b0f3d61 2020-01-22 neels 		.right_path = file2,
107 3b0f3d61 2020-01-22 neels 	};
108 3b0f3d61 2020-01-22 neels 
109 3b0f3d61 2020-01-22 neels 	str1 = mmapfile(file1, &st1);
110 3b0f3d61 2020-01-22 neels 	str2 = mmapfile(file2, &st2);
111 3b0f3d61 2020-01-22 neels 
112 81b40973 2020-01-22 neels 	diff_unidiff(stdout, &diff_config, &info, str1, st1.st_size, str2, st2.st_size, 3);
113 3b0f3d61 2020-01-22 neels 
114 3b0f3d61 2020-01-22 neels 	munmap(str1, st1.st_size);
115 3b0f3d61 2020-01-22 neels 	munmap(str2, st2.st_size);
116 3b0f3d61 2020-01-22 neels 
117 3b0f3d61 2020-01-22 neels 	return 0;
118 3b0f3d61 2020-01-22 neels }
119 3b0f3d61 2020-01-22 neels 
120 3b0f3d61 2020-01-22 neels char *
121 3b0f3d61 2020-01-22 neels mmapfile(const char *path, struct stat *st)
122 3b0f3d61 2020-01-22 neels {
123 3b0f3d61 2020-01-22 neels 	int			 fd;
124 3b0f3d61 2020-01-22 neels 	char			*p;
125 3b0f3d61 2020-01-22 neels 
126 3b0f3d61 2020-01-22 neels 	fd = open(path, O_RDONLY);
127 3b0f3d61 2020-01-22 neels 	if (fd == -1)
128 3b0f3d61 2020-01-22 neels 		err(2, "%s", path);
129 3b0f3d61 2020-01-22 neels 
130 3b0f3d61 2020-01-22 neels 	if (fstat(fd, st) == -1)
131 3b0f3d61 2020-01-22 neels 		err(2, "%s", path);
132 3b0f3d61 2020-01-22 neels 
133 3b0f3d61 2020-01-22 neels 	if ((uintmax_t)st->st_size > SIZE_MAX)
134 3b0f3d61 2020-01-22 neels 		errx(2, "%s: file too big to fit memory", path);
135 3b0f3d61 2020-01-22 neels 
136 3b0f3d61 2020-01-22 neels 	p = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
137 3b0f3d61 2020-01-22 neels 	if (p == MAP_FAILED)
138 3b0f3d61 2020-01-22 neels 		err(2, "mmap");
139 3b0f3d61 2020-01-22 neels 
140 3b0f3d61 2020-01-22 neels 	close(fd);
141 3b0f3d61 2020-01-22 neels 
142 3b0f3d61 2020-01-22 neels 	return p;
143 3b0f3d61 2020-01-22 neels }