316 lines
7.8 KiB
C
316 lines
7.8 KiB
C
/* $OpenBSD: diffdir.c,v 1.45 2015/10/05 20:15:00 millert Exp $ */
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/*
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* Copyright (c) 2003, 2010 Todd C. Miller <Todd.Miller@courtesan.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#include <sys/cdefs.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fnmatch.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <unistd.h>
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#include "diff.h"
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static int selectfile(const struct dirent *);
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static void diffit(struct dirent *, char *, size_t, struct dirent *,
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char *, size_t, int);
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static void print_only(const char *, size_t, const char *);
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#define d_status d_type /* we need to store status for -l */
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/*
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* Diff directory traversal. Will be called recursively if -r was specified.
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*/
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void
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diffdir(char *p1, char *p2, int flags)
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{
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struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL;
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struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL;
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size_t dirlen1, dirlen2;
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char path1[PATH_MAX], path2[PATH_MAX];
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int pos;
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edp1 = edp2 = NULL;
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dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1));
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if (dirlen1 >= sizeof(path1) - 1) {
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warnc(ENAMETOOLONG, "%s", p1);
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status |= 2;
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return;
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}
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if (path1[dirlen1 - 1] != '/') {
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path1[dirlen1++] = '/';
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path1[dirlen1] = '\0';
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}
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dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2));
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if (dirlen2 >= sizeof(path2) - 1) {
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warnc(ENAMETOOLONG, "%s", p2);
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status |= 2;
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return;
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}
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if (path2[dirlen2 - 1] != '/') {
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path2[dirlen2++] = '/';
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path2[dirlen2] = '\0';
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}
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/*
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* Get a list of entries in each directory, skipping "excluded" files
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* and sorting alphabetically.
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*/
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pos = scandir(path1, &dirp1, selectfile, alphasort);
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if (pos == -1) {
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if (errno == ENOENT && (Nflag || Pflag)) {
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pos = 0;
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} else {
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warn("%s", path1);
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goto closem;
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}
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}
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dp1 = dirp1;
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edp1 = dirp1 + pos;
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pos = scandir(path2, &dirp2, selectfile, alphasort);
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if (pos == -1) {
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if (errno == ENOENT && Nflag) {
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pos = 0;
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} else {
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warn("%s", path2);
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goto closem;
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}
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}
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dp2 = dirp2;
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edp2 = dirp2 + pos;
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/*
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* If we were given a starting point, find it.
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*/
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if (start != NULL) {
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while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0)
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dp1++;
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while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0)
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dp2++;
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}
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/*
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* Iterate through the two directory lists, diffing as we go.
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*/
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while (dp1 != edp1 || dp2 != edp2) {
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dent1 = dp1 != edp1 ? *dp1 : NULL;
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dent2 = dp2 != edp2 ? *dp2 : NULL;
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pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 :
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ignore_file_case ? strcasecmp(dent1->d_name, dent2->d_name) :
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strcmp(dent1->d_name, dent2->d_name) ;
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if (pos == 0) {
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/* file exists in both dirs, diff it */
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diffit(dent1, path1, dirlen1, dent2, path2, dirlen2, flags);
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dp1++;
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dp2++;
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} else if (pos < 0) {
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/* file only in first dir, only diff if -N */
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if (Nflag) {
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diffit(dent1, path1, dirlen1, dent2, path2,
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dirlen2, flags);
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} else {
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print_only(path1, dirlen1, dent1->d_name);
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status |= 1;
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}
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dp1++;
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} else {
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/* file only in second dir, only diff if -N or -P */
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if (Nflag || Pflag)
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diffit(dent2, path1, dirlen1, dent1, path2,
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dirlen2, flags);
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else {
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print_only(path2, dirlen2, dent2->d_name);
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status |= 1;
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}
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dp2++;
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}
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}
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closem:
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if (dirp1 != NULL) {
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for (dp1 = dirp1; dp1 < edp1; dp1++)
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free(*dp1);
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free(dirp1);
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}
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if (dirp2 != NULL) {
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for (dp2 = dirp2; dp2 < edp2; dp2++)
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free(*dp2);
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free(dirp2);
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}
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}
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/*
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* Do the actual diff by calling either diffreg() or diffdir().
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*/
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static void
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diffit(struct dirent *dp, char *path1, size_t plen1, struct dirent *dp2,
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char *path2, size_t plen2, int flags)
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{
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flags |= D_HEADER;
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strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1);
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/*
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* If we are ignoring file case, use dent2s name here if both names are
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* the same apart from case.
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*/
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if (ignore_file_case && strcasecmp(dp2->d_name, dp2->d_name) == 0)
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strlcpy(path2 + plen2, dp2->d_name, PATH_MAX - plen2);
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else
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strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2);
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if (noderef) {
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if (lstat(path1, &stb1) != 0) {
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if (!(Nflag || Pflag) || errno != ENOENT) {
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warn("%s", path1);
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return;
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}
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flags |= D_EMPTY1;
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memset(&stb1, 0, sizeof(stb1));
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}
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if (lstat(path2, &stb2) != 0) {
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if (!Nflag || errno != ENOENT) {
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warn("%s", path2);
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return;
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}
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flags |= D_EMPTY2;
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memset(&stb2, 0, sizeof(stb2));
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stb2.st_mode = stb1.st_mode;
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}
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if (stb1.st_mode == 0)
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stb1.st_mode = stb2.st_mode;
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if (S_ISLNK(stb1.st_mode) || S_ISLNK(stb2.st_mode)) {
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if (S_ISLNK(stb1.st_mode) && S_ISLNK(stb2.st_mode)) {
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char buf1[PATH_MAX];
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char buf2[PATH_MAX];
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ssize_t len1 = 0;
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ssize_t len2 = 0;
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len1 = readlink(path1, buf1, sizeof(buf1));
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len2 = readlink(path2, buf2, sizeof(buf2));
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if (len1 < 0 || len2 < 0) {
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perror("reading links");
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return;
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}
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buf1[len1] = '\0';
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buf2[len2] = '\0';
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if (len1 != len2 || strncmp(buf1, buf2, len1) != 0) {
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printf("Symbolic links %s and %s differ\n",
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path1, path2);
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status |= 1;
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}
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return;
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}
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printf("File %s is a %s while file %s is a %s\n",
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path1, S_ISLNK(stb1.st_mode) ? "symbolic link" :
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(S_ISDIR(stb1.st_mode) ? "directory" :
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(S_ISREG(stb1.st_mode) ? "file" : "error")),
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path2, S_ISLNK(stb2.st_mode) ? "symbolic link" :
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(S_ISDIR(stb2.st_mode) ? "directory" :
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(S_ISREG(stb2.st_mode) ? "file" : "error")));
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status |= 1;
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return;
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}
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} else {
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if (stat(path1, &stb1) != 0) {
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if (!(Nflag || Pflag) || errno != ENOENT) {
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warn("%s", path1);
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return;
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}
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flags |= D_EMPTY1;
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memset(&stb1, 0, sizeof(stb1));
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}
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if (stat(path2, &stb2) != 0) {
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if (!Nflag || errno != ENOENT) {
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warn("%s", path2);
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return;
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}
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flags |= D_EMPTY2;
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memset(&stb2, 0, sizeof(stb2));
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stb2.st_mode = stb1.st_mode;
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}
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if (stb1.st_mode == 0)
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stb1.st_mode = stb2.st_mode;
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}
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if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
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if (rflag)
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diffdir(path1, path2, flags);
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else
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printf("Common subdirectories: %s and %s\n",
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path1, path2);
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return;
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}
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if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode))
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dp->d_status = D_SKIPPED1;
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else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
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dp->d_status = D_SKIPPED2;
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else
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dp->d_status = diffreg(path1, path2, flags, 0);
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print_status(dp->d_status, path1, path2, "");
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}
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/*
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* Returns 1 if the directory entry should be included in the
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* diff, else 0. Checks the excludes list.
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*/
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static int
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selectfile(const struct dirent *dp)
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{
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struct excludes *excl;
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if (dp->d_fileno == 0)
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return (0);
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/* always skip "." and ".." */
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if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
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(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
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return (0);
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/* check excludes list */
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for (excl = excludes_list; excl != NULL; excl = excl->next)
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if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0)
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return (0);
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return (1);
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}
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void
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print_only(const char *path, size_t dirlen, const char *entry)
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{
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if (dirlen > 1)
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dirlen--;
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printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
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}
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