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IABSD.fr/src/usr.bin/diff/diffdir.c
millert
- usr.bin/diff/diffdir.c
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/* $OpenBSD: diffdir.c,v 1.47 2019/01/25 00:19:26 millert Exp $ */ /* * Copyright (c) 2003, 2010 Todd C. Miller <millert@openbsd.org> * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ #include <sys/stat.h> #include <dirent.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <fnmatch.h> #include <paths.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <limits.h> #include "diff.h" #include "xmalloc.h" static int selectfile(const struct dirent *); static void diffit(struct dirent *, char *, size_t, char *, size_t, int); #define d_status d_type /* we need to store status for -l */ /* * Diff directory traversal. Will be called recursively if -r was specified. */ void diffdir(char *p1, char *p2, int flags) { struct dirent *dent1, **dp1, **edp1, **dirp1 = NULL; struct dirent *dent2, **dp2, **edp2, **dirp2 = NULL; size_t dirlen1, dirlen2; char path1[PATH_MAX], path2[PATH_MAX]; int pos; dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1)); if (dirlen1 >= sizeof(path1) - 1) { warnc(ENAMETOOLONG, "%s", p1); status |= 2; return; } if (path1[dirlen1 - 1] != '/') { path1[dirlen1++] = '/'; path1[dirlen1] = '\0'; } dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2)); if (dirlen2 >= sizeof(path2) - 1) { warnc(ENAMETOOLONG, "%s", p2); status |= 2; return; } if (path2[dirlen2 - 1] != '/') { path2[dirlen2++] = '/'; path2[dirlen2] = '\0'; } /* * Get a list of entries in each directory, skipping "excluded" files * and sorting alphabetically. */ pos = scandir(path1, &dirp1, selectfile, alphasort); if (pos == -1) { if (errno == ENOENT && (Nflag || Pflag)) { pos = 0; } else { warn("%s", path1); goto closem; } } dp1 = dirp1; edp1 = dirp1 + pos; pos = scandir(path2, &dirp2, selectfile, alphasort); if (pos == -1) { if (errno == ENOENT && Nflag) { pos = 0; } else { warn("%s", path2); goto closem; } } dp2 = dirp2; edp2 = dirp2 + pos; /* * If we were given a starting point, find it. */ if (start != NULL) { while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0) dp1++; while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0) dp2++; } /* * Iterate through the two directory lists, diffing as we go. */ while (dp1 != edp1 || dp2 != edp2) { dent1 = dp1 != edp1 ? *dp1 : NULL; dent2 = dp2 != edp2 ? *dp2 : NULL; pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 : strcmp(dent1->d_name, dent2->d_name); if (pos == 0) { /* file exists in both dirs, diff it */ diffit(dent1, path1, dirlen1, path2, dirlen2, flags); dp1++; dp2++; } else if (pos < 0) { /* file only in first dir, only diff if -N */ if (Nflag) { diffit(dent1, path1, dirlen1, path2, dirlen2, flags); } else { print_only(path1, dirlen1, dent1->d_name); status |= 1; } dp1++; } else { /* file only in second dir, only diff if -N or -P */ if (Nflag || Pflag) { diffit(dent2, path1, dirlen1, path2, dirlen2, flags); } else { print_only(path2, dirlen2, dent2->d_name); status |= 1; } dp2++; } } closem: if (dirp1 != NULL) { for (dp1 = dirp1; dp1 < edp1; dp1++) free(*dp1); free(dirp1); } if (dirp2 != NULL) { for (dp2 = dirp2; dp2 < edp2; dp2++) free(*dp2); free(dirp2); } } /* * Do the actual diff by calling either diffreg() or diffdir(). */ static void diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2, int flags) { flags |= D_HEADER; strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1); if (stat(path1, &stb1) != 0) { if (!(Nflag || Pflag) || errno != ENOENT) { warn("%s", path1); return; } flags |= D_EMPTY1; memset(&stb1, 0, sizeof(stb1)); } strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2); if (stat(path2, &stb2) != 0) { if (!Nflag || errno != ENOENT) { warn("%s", path2); return; } flags |= D_EMPTY2; memset(&stb2, 0, sizeof(stb2)); stb2.st_mode = stb1.st_mode; } if (stb1.st_mode == 0) stb1.st_mode = stb2.st_mode; if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) { if (rflag) diffdir(path1, path2, flags); else printf("Common subdirectories: %s and %s\n", path1, path2); return; } if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode)) dp->d_status = D_SKIPPED1; else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode)) dp->d_status = D_SKIPPED2; else dp->d_status = diffreg(path1, path2, flags); print_status(dp->d_status, path1, path2, ""); } /* * Returns 1 if the directory entry should be included in the * diff, else 0. Checks the excludes list. */ static int selectfile(const struct dirent *dp) { struct excludes *excl; if (dp->d_fileno == 0) return (0); /* always skip "." and ".." */ if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' || (dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) return (0); /* check excludes list */ for (excl = excludes_list; excl != NULL; excl = excl->next) if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0) return (0); return (1); }