+++ /dev/null
-/* treecmp - compare two trees Author: Andy Tanenbaum */
-
-/* This program recursively compares two trees and reports on differences.
- * It can be used, for example, when a project consists of a large number
- * of files and directories. When a new release (i.e., a new tree) has been
- * prepared, the old and new tree can be compared to give a list of what has
- * changed. The algorithm used is that the second tree is recursively
- * descended and for each file or directory found, the corresponding one in
- * the other tree checked. The two arguments are not completely symmetric
- * because the second tree is descended, not the first one, but reversing
- * the arguments will still detect all the differences, only they will be
- * printed in a different order. The program needs lots of stack space
- * because routines with local arrays are called recursively. The call is
- * treecmp [-cv] old_dir new_dir
- * The -v flag (verbose) prints the directory names as they are processed.
- * The -c flag (changes) just prints the names of changed and new files.
- */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#define BUFSIZE 4096 /* size of file buffers */
-#define MAXPATH 128 /* longest acceptable path */
-#define DIRENTLEN 14 /* number of characters in a file name */
-
-struct dirstruct { /* layout of a directory entry */
- ino_t inum;
- char fname[DIRENTLEN];
-};
-
-struct stat stat1, stat2; /* stat buffers */
-
-char buf1[BUFSIZE]; /* used for comparing bufs */
-char buf2[BUFSIZE]; /* used for comparing bufs */
-
-int changes; /* set on -c flag */
-int verbose; /* set on -v flag */
-
-_PROTOTYPE(int main, (int argc, char **argv));
-_PROTOTYPE(void compare, (char *old, char *new));
-_PROTOTYPE(void regular, (char *old, char *new));
-_PROTOTYPE(void directory, (char *old, char *new));
-_PROTOTYPE(void check, (char *s, struct dirstruct *dp1, int ent1, char *new));
-_PROTOTYPE(void usage, (void));
-
-int main(argc, argv)
-int argc;
-char *argv[];
-{
- char *p;
-
- if (argc < 3 || argc > 4) usage();
- p = argv[1];
- if (argc == 4) {
- if (*p != '-') usage();
- p++;
- if (*p == '\0') usage();
- while (*p) {
- if (*p == 'c') changes++;
- if (*p == 'v') verbose++;
- if (*p != 'c' && *p != 'v') usage();
- p++;
- }
- }
- if (argc == 3)
- compare(argv[1], argv[2]);
- else
- compare(argv[2], argv[3]);
-
- return(0);
-}
-
-void compare(old, new)
-char *old, *new;
-{
-/* This is the main comparision routine. It gets two path names as arguments
- * and stats them both. Depending on the results, it calls other routines
- * to compare directories or files.
- */
-
- int type1, type2;
-
- if (stat(new, &stat1) < 0) {
- /* The new file does not exist. */
- if (changes == 0)
- fprintf(stderr, "Cannot stat: %s\n", new);
- else
- printf("%s\n", new);
- return;
- }
- if (stat(old, &stat2) < 0) {
- /* The old file does not exist. */
- if (changes == 0)
- fprintf(stderr, "Missing file: %s\n", old);
- else
- printf("%s\n", new);
- return;
- }
-
- /* Examine the types of the files. */
- type1 = stat1.st_mode & S_IFMT;
- type2 = stat2.st_mode & S_IFMT;
- if (type1 != type2) {
- fprintf(stderr, "Type diff: %s and %s\n", new, old);
- return;
- }
-
- /* The types are the same. */
- switch (type1) {
- case S_IFREG: regular(old, new); break;
- case S_IFDIR: directory(old, new); break;
- case S_IFCHR: break;
- case S_IFBLK: break;
- default: fprintf(stderr, "Unknown file type %o\n", type1);
- }
- return;
-}
-
-void regular(old, new)
-char *old, *new;
-{
-/* Compare to regular files. If they are different, complain. */
-
- int fd1, fd2, n1, n2;
- unsigned bytes;
- long count;
-
- if (stat1.st_size != stat2.st_size) {
- if (changes == 0)
- printf("Size diff: %s and %s\n", new, old);
- else
- printf("%s\n", new);
- return;
- }
-
- /* The sizes are the same. We actually have to read the files now. */
- fd1 = open(new, O_RDONLY);
- if (fd1 < 0) {
- fprintf(stderr, "Cannot open %s for reading\n", new);
- return;
- }
- fd2 = open(old, O_RDONLY);
- if (fd2 < 0) {
- fprintf(stderr, "Cannot open %s for reading\n", old);
- return;
- }
- count = stat1.st_size;
- while (count > 0L) {
- bytes = (unsigned) (count > BUFSIZE ? BUFSIZE : count); /* rd count */
- n1 = read(fd1, buf1, bytes);
- n2 = read(fd2, buf2, bytes);
- if (n1 != n2) {
- if (changes == 0)
- printf("Length diff: %s and %s\n", new, old);
- else
- printf("%s\n", new);
- close(fd1);
- close(fd2);
- return;
- }
-
- /* Compare the buffers. */
- if (memcmp((void *) buf1, (void *) buf2, (size_t) n1) != 0) {
- if (changes == 0)
- printf("File diff: %s and %s\n", new, old);
- else
- printf("%s\n", new);
- close(fd1);
- close(fd2);
- return;
- }
- count -= n1;
- }
- close(fd1);
- close(fd2);
-}
-
-void directory(old, new)
-char *old, *new;
-{
-/* Recursively compare two directories by reading them and comparing their
- * contents. The order of the entries need not be the same.
- */
-
- int fd1, fd2, n1, n2, ent1, ent2, i, used1 = 0, used2 = 0;
- char *dir1buf, *dir2buf;
- char name1buf[MAXPATH], name2buf[MAXPATH];
- struct dirstruct *dp1, *dp2;
- unsigned dir1bytes, dir2bytes;
-
- /* Allocate space to read in the directories */
- dir1bytes = (unsigned) stat1.st_size;
- dir1buf = (char *)malloc((size_t)dir1bytes);
- if (dir1buf == 0) {
- fprintf(stderr, "Cannot process directory %s: out of memory\n", new);
- return;
- }
- dir2bytes = (unsigned) stat2.st_size;
- dir2buf = (char *)malloc((size_t)dir2bytes);
- if (dir2buf == 0) {
- fprintf(stderr, "Cannot process directory %s: out of memory\n", old);
- free(dir1buf);
- return;
- }
-
- /* Read in the directories. */
- fd1 = open(new, O_RDONLY);
- if (fd1 > 0) n1 = read(fd1, dir1buf, dir1bytes);
- if (fd1 < 0 || n1 != dir1bytes) {
- fprintf(stderr, "Cannot read directory %s\n", new);
- free(dir1buf);
- free(dir2buf);
- if (fd1 > 0) close(fd1);
- return;
- }
- close(fd1);
-
- fd2 = open(old, O_RDONLY);
- if (fd2 > 0) n2 = read(fd2, dir2buf, dir2bytes);
- if (fd2 < 0 || n2 != dir2bytes) {
- fprintf(stderr, "Cannot read directory %s\n", old);
- free(dir1buf);
- free(dir2buf);
- close(fd1);
- if (fd2 > 0) close(fd2);
- return;
- }
- close(fd2);
-
- /* Linearly search directories */
- ent1 = dir1bytes / sizeof(struct dirstruct);
- dp1 = (struct dirstruct *) dir1buf;
- for (i = 0; i < ent1; i++) {
- if (dp1->inum != 0) used1++;
- dp1++;
- }
-
- ent2 = dir2bytes / sizeof(struct dirstruct);
- dp2 = (struct dirstruct *) dir2buf;
- for (i = 0; i < ent2; i++) {
- if (dp2->inum != 0) used2++;
- dp2++;
- }
-
- if (verbose) printf("Directory %s: %d entries\n", new, used1);
-
- /* Check to see if any entries in dir2 are missing from dir1. */
- dp1 = (struct dirstruct *) dir1buf;
- dp2 = (struct dirstruct *) dir2buf;
- for (i = 0; i < ent2; i++) {
- if (dp2->inum == 0 || strcmp(dp2->fname, ".") == 0 ||
- strcmp(dp2->fname, "..") == 0) {
- dp2++;
- continue;
- }
- check(dp2->fname, dp1, ent1, new);
- dp2++;
- }
-
- /* Recursively process all the entries in dir1. */
- dp1 = (struct dirstruct *) dir1buf;
- for (i = 0; i < ent1; i++) {
- if (dp1->inum == 0 || strcmp(dp1->fname, ".") == 0 ||
- strcmp(dp1->fname, "..") == 0) {
- dp1++;
- continue;
- }
- if (strlen(new) + DIRENTLEN >= MAXPATH) {
- fprintf(stderr, "Path too long: %s\n", new);
- free(dir1buf);
- free(dir2buf);
- return;
- }
- if (strlen(old) + DIRENTLEN >= MAXPATH) {
- fprintf(stderr, "Path too long: %s\n", old);
- free(dir1buf);
- free(dir2buf);
- return;
- }
- strcpy(name1buf, old);
- strcat(name1buf, "/");
- strncat(name1buf, dp1->fname, (size_t)DIRENTLEN);
- strcpy(name2buf, new);
- strcat(name2buf, "/");
- strncat(name2buf, dp1->fname, (size_t)DIRENTLEN);
-
- /* Here is the recursive call to process an entry. */
- compare(name1buf, name2buf); /* recursive call */
- dp1++;
- }
-
- free(dir1buf);
- free(dir2buf);
-}
-
-void check(s, dp1, ent1, new)
-char *s;
-struct dirstruct *dp1;
-int ent1;
-char *new;
-{
-/* See if the file name 's' is present in the directory 'dirbuf'. */
- int i;
- char file[DIRENTLEN+1];
-
- for (i = 0; i < ent1; i++) {
- if (strncmp(dp1->fname, s, (size_t)DIRENTLEN) == 0) return;
- dp1++;
- }
- if (changes == 0) {
- strncpy(file, s, DIRENTLEN);
- file[DIRENTLEN] = '\0';
- printf("Missing file: %s/%s\n", new, file);
- }
-
-}
-
-void usage()
-{
- printf("Usage: treecmp [-cv] old_dir new_dir\n");
- exit(1);
-}