initial commit, brokenHEADdircmp

1 files changed, 181 insertions, 0 deletions

diff --git a/dircmp.c b/dircmp.c
new file mode 100644
index 0000000..3bca7a3
--- /dev/null
+++ b/dircmp.c
@@ -0,0 +1,181 @@
+/*
+ * UNG's Not GNU
+ *
+ * Copyright (c) 2022, Jakob Kaivo <jkk@ung.org>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#define _XOPEN_SOURCE 700
+#include <fcntl.h>
+#include <errno.h>
+#include <limits.h>
+#include <locale.h>
+#include <ftw.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#ifndef OPEN_MAX
+#ifdef _XOPEN_MAX
+#define OPEN_MAX _XOPEN_MAX
+#else
+#define OPEN_MAX _POSIX_OPEN_MAX
+#endif
+#endif
+
+static int directory_fd[2];
+static char *directory_path[2];
+static int return_value = 0;
+static int current_fd = 0;
+static size_t directory_base = 0;
+static int suppress = 0;
+static int diff_output = 0;
+
+static int compare(char *d1, char *d2, const char *path)
+{
+	char p1[PATH_MAX];
+	char p2[PATH_MAX];
+
+	snprintf(p1, sizeof(p1), "%s/%s", d1, path);
+	snprintf(p2, sizeof(p2), "%s/%s", d2, path);
+
+	if (diff_output) {
+		/* run diff d1/path d2/path */
+		return 0;
+	}
+
+	FILE *f1 = fopen(p1, "r");
+	if (!f1) {
+		fprintf(stderr, "dircmp: %s: %s\n", p1, strerror(errno));
+		return 1;
+	}
+
+	FILE *f2 = fopen(p2, "r");
+	if (!f2) {
+		fprintf(stderr, "dircmp: %s: %s\n", p2, strerror(errno));
+		fclose(f1);
+		return 1;
+	}
+
+	for (;;) {
+		int c1 = fgetc(f1);
+		int c2 = fgetc(f2);
+		if (c1 != c2) {
+			printf("files differ: %s %s\n", p1, p2);
+			break;
+		}
+		if (c1 == EOF) {
+			if (!suppress) {
+				printf("files match: %s %s\n", p1, p2);
+			}
+			break;
+		}
+	}
+
+	fclose(f1);
+	fclose(f2);
+	
+	return 0;
+}
+
+static int dircmp(const char *path, const struct stat *st, int type, struct FTW *ftw)
+{
+	(void)ftw; (void)type; (void)st;
+
+	//int fd1 = directory_fd[current_fd];
+	int fd2 = directory_fd[current_fd == 0 ? 1 : 0];
+	char *d1 = directory_path[current_fd];
+	char *d2 = directory_path[current_fd == 0 ? 1 : 0];
+
+	path += directory_base;
+
+	struct stat st2;
+	if (fstatat(fd2, path, &st2, 0) != 0) {
+		if (errno == ENOENT) {
+			printf("only in %s: %s\n", d1, path);
+			return 0;
+		}
+		fprintf(stderr, "dircmp: %s/%s: %s\n", d2, path, strerror(errno));
+		return_value = 1;
+		return 0;
+	}
+
+	/* common files have already been compared */
+	if (current_fd == 1) {
+		return 0;
+	}
+
+	return_value |= compare(d1, d2, path);
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	setlocale(LC_ALL, "");
+
+	int c;
+	while ((c = getopt(argc, argv, "ds")) != EOF) {
+		switch (c) {
+		case 'd':	/** compare files as with `diff` **/
+			diff_output = 1;
+			break;
+
+		case 's':	/** suppress identical files output **/
+			suppress = 1;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (optind != argc - 2) {
+		fprintf(stderr, "cmp: missing operand\n");
+		return 1;
+	}
+
+	directory_path[0] = argv[optind];
+	directory_path[1] = argv[optind];
+
+	directory_fd[0] = open(directory_path[0], O_RDONLY | O_DIRECTORY);
+	if (directory_fd[0] == -1) {
+		fprintf(stderr, "dircmp: %s: %s\n", directory_path[0], strerror(errno));
+		return 1;
+	}
+
+	directory_fd[1] = open(directory_path[0], O_RDONLY | O_DIRECTORY);
+	if (directory_fd[1] == -1) {
+		fprintf(stderr, "dircmp: %s: %s\n", directory_path[1], strerror(errno));
+		return 1;
+	}
+
+
+	directory_base = strlen(directory_path[0]) + 1;
+	nftw(directory_path[0], dircmp, OPEN_MAX, 0);
+
+	current_fd = 1;
+	directory_base = strlen(directory_path[1]) + 1;
+	nftw(directory_path[1], dircmp, OPEN_MAX, 0);
+
+	return return_value;
+}