1 3b0f3d61 2020-01-22 neels /* Commandline diff utility to test diff implementations. */
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>
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.
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.
19 3b0f3d61 2020-01-22 neels #include <sys/mman.h>
20 3b0f3d61 2020-01-22 neels #include <sys/stat.h>
21 18a9c7f8 2020-09-20 stsp #include <sys/types.h>
23 3b0f3d61 2020-01-22 neels #include <err.h>
24 3b0f3d61 2020-01-22 neels #include <fcntl.h>
25 3b0f3d61 2020-01-22 neels #include <inttypes.h>
26 3b0f3d61 2020-01-22 neels #include <stdio.h>
27 3b0f3d61 2020-01-22 neels #include <stdlib.h>
28 e10a628a 2020-09-16 stsp #include <stdbool.h>
29 3e6cba3a 2020-08-13 stsp #include <string.h>
30 3b0f3d61 2020-01-22 neels #include <unistd.h>
32 e10a628a 2020-09-16 stsp #include <diff/arraylist.h>
33 8ad022d2 2020-05-05 neels #include <diff/diff_main.h>
34 8ad022d2 2020-05-05 neels #include <diff/diff_output.h>
36 3b0f3d61 2020-01-22 neels __dead void usage(void);
37 527f2c8a 2020-09-20 stsp int diffreg(char *, char *, bool, bool, int);
38 7a54ad3a 2020-09-20 stsp FILE * openfile(const char *, char **, struct stat *);
40 3b0f3d61 2020-01-22 neels __dead void
41 3b0f3d61 2020-01-22 neels usage(void)
43 760fe30e 2020-05-05 neels fprintf(stderr,
44 527f2c8a 2020-09-20 stsp "usage: %s [-pw] [-C n] file1 file2\n"
46 760fe30e 2020-05-05 neels " -p Use Patience Diff (slower but often nicer)\n"
47 732e8ee0 2020-09-20 stsp " -w Ignore Whitespace\n"
48 527f2c8a 2020-09-20 stsp " -C n Number of Context Lines\n"
49 760fe30e 2020-05-05 neels , getprogname());
54 3b0f3d61 2020-01-22 neels main(int argc, char *argv[])
57 732e8ee0 2020-09-20 stsp bool do_patience = false, ignore_whitespace = false;
58 527f2c8a 2020-09-20 stsp int context_lines = 3;
60 527f2c8a 2020-09-20 stsp while ((ch = getopt(argc, argv, "pwC:")) != -1) {
61 3b0f3d61 2020-01-22 neels switch (ch) {
63 760fe30e 2020-05-05 neels do_patience = true;
66 732e8ee0 2020-09-20 stsp ignore_whitespace = true;
69 527f2c8a 2020-09-20 stsp context_lines = atoi(optarg);
76 3b0f3d61 2020-01-22 neels argc -= optind;
77 3b0f3d61 2020-01-22 neels argv += optind;
79 3b0f3d61 2020-01-22 neels if (argc != 2)
82 527f2c8a 2020-09-20 stsp rc = diffreg(argv[0], argv[1], do_patience, ignore_whitespace,
83 527f2c8a 2020-09-20 stsp context_lines);
84 3e6cba3a 2020-08-13 stsp if (rc != DIFF_RC_OK) {
85 3e6cba3a 2020-08-13 stsp fprintf(stderr, "diff: %s\n", strerror(rc));
91 0d27172a 2020-05-06 neels const struct diff_algo_config myers_then_patience;
92 0d27172a 2020-05-06 neels const struct diff_algo_config myers_then_myers_divide;
93 0d27172a 2020-05-06 neels const struct diff_algo_config patience;
94 0d27172a 2020-05-06 neels const struct diff_algo_config myers_divide;
96 760fe30e 2020-05-05 neels const struct diff_algo_config myers_then_patience = (struct diff_algo_config){
97 3b0f3d61 2020-01-22 neels .impl = diff_algo_myers,
98 9e668157 2020-01-27 neels .permitted_state_size = 1024 * 1024 * sizeof(int),
99 3b0f3d61 2020-01-22 neels .fallback_algo = &patience,
102 0d27172a 2020-05-06 neels const struct diff_algo_config myers_then_myers_divide =
103 0d27172a 2020-05-06 neels (struct diff_algo_config){
104 760fe30e 2020-05-05 neels .impl = diff_algo_myers,
105 760fe30e 2020-05-05 neels .permitted_state_size = 1024 * 1024 * sizeof(int),
106 760fe30e 2020-05-05 neels .fallback_algo = &myers_divide,
109 3b0f3d61 2020-01-22 neels const struct diff_algo_config patience = (struct diff_algo_config){
110 3b0f3d61 2020-01-22 neels .impl = diff_algo_patience,
111 0d27172a 2020-05-06 neels /* After subdivision, do Patience again: */
112 0d27172a 2020-05-06 neels .inner_algo = &patience,
113 0d27172a 2020-05-06 neels /* If subdivision failed, do Myers Divide et Impera: */
114 0d27172a 2020-05-06 neels .fallback_algo = &myers_then_myers_divide,
117 3b0f3d61 2020-01-22 neels const struct diff_algo_config myers_divide = (struct diff_algo_config){
118 3b0f3d61 2020-01-22 neels .impl = diff_algo_myers_divide,
119 0d27172a 2020-05-06 neels /* When division succeeded, start from the top: */
120 0d27172a 2020-05-06 neels .inner_algo = &myers_then_myers_divide,
121 0d27172a 2020-05-06 neels /* (fallback_algo = NULL implies diff_algo_none). */
124 3b0f3d61 2020-01-22 neels const struct diff_config diff_config = {
125 3b0f3d61 2020-01-22 neels .atomize_func = diff_atomize_text_by_line,
126 760fe30e 2020-05-05 neels .algo = &myers_then_myers_divide,
129 760fe30e 2020-05-05 neels const struct diff_config diff_config_patience = {
130 760fe30e 2020-05-05 neels .atomize_func = diff_atomize_text_by_line,
131 760fe30e 2020-05-05 neels .algo = &myers_then_patience,
135 527f2c8a 2020-09-20 stsp diffreg(char *file1, char *file2, bool do_patience, bool ignore_whitespace,
136 527f2c8a 2020-09-20 stsp int context_lines)
138 3b0f3d61 2020-01-22 neels char *str1, *str2;
139 7a54ad3a 2020-09-20 stsp FILE *f1, *f2;
140 3b0f3d61 2020-01-22 neels struct stat st1, st2;
141 3b0f3d61 2020-01-22 neels struct diff_input_info info = {
142 3b0f3d61 2020-01-22 neels .left_path = file1,
143 3b0f3d61 2020-01-22 neels .right_path = file2,
145 f8cbb8fe 2020-05-05 neels struct diff_result *result;
147 0d27172a 2020-05-06 neels const struct diff_config *cfg;
148 00d5652b 2020-09-22 stsp int diff_flags = 0;
150 0d27172a 2020-05-06 neels cfg = do_patience ? &diff_config_patience : &diff_config;
152 7a54ad3a 2020-09-20 stsp f1 = openfile(file1, &str1, &st1);
153 7a54ad3a 2020-09-20 stsp f2 = openfile(file2, &str2, &st2);
155 00d5652b 2020-09-22 stsp if (ignore_whitespace)
156 00d5652b 2020-09-22 stsp diff_flags |= DIFF_FLAG_IGNORE_WHITESPACE;
158 7a54ad3a 2020-09-20 stsp result = diff_main(cfg, f1, str1, st1.st_size, f2, str2, st2.st_size,
159 00d5652b 2020-09-22 stsp diff_flags);
161 f8cbb8fe 2020-05-05 neels rc = diff_output_plain(stdout, &info, result);
163 2c20a3ed 2020-09-22 stsp rc = diff_output_unidiff(NULL, stdout, &info, result, context_lines);
165 f8cbb8fe 2020-05-05 neels diff_result_free(result);
168 c6eecea3 2020-07-26 stsp munmap(str1, st1.st_size);
170 c6eecea3 2020-07-26 stsp munmap(str2, st2.st_size);
171 7a54ad3a 2020-09-20 stsp fclose(f1);
172 7a54ad3a 2020-09-20 stsp fclose(f2);
174 f8cbb8fe 2020-05-05 neels return rc;
178 c6eecea3 2020-07-26 stsp openfile(const char *path, char **p, struct stat *st)
180 7a54ad3a 2020-09-20 stsp FILE *f = NULL;
182 7a54ad3a 2020-09-20 stsp f = fopen(path, "r");
183 7a54ad3a 2020-09-20 stsp if (f == NULL)
184 3b0f3d61 2020-01-22 neels err(2, "%s", path);
186 7a54ad3a 2020-09-20 stsp if (fstat(fileno(f), st) == -1)
187 3b0f3d61 2020-01-22 neels err(2, "%s", path);
189 c6eecea3 2020-07-26 stsp #ifndef DIFF_NO_MMAP
190 7a54ad3a 2020-09-20 stsp *p = mmap(NULL, st->st_size, PROT_READ, MAP_PRIVATE, fileno(f), 0);
191 c6eecea3 2020-07-26 stsp if (*p == MAP_FAILED)
193 c6eecea3 2020-07-26 stsp *p = NULL; /* fall back on file I/O */