OpenBSD-4.6/usr.bin/diff/diffdir.c
/* $OpenBSD: diffdir.c,v 1.34 2009/06/07 08:39:13 ray Exp $ */
/*
* Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*/
#ifndef lint
static const char rcsid[] = "$OpenBSD: diffdir.c,v 1.34 2009/06/07 08:39:13 ray Exp $";
#endif /* not lint */
#include <sys/param.h>
#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 "diff.h"
#include "xmalloc.h"
static int dircompare(const void *, const void *);
static int excluded(const char *);
static struct dirent **slurpdir(char *, char **, int);
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 **dirp1, **dirp2, **dp1, **dp2;
struct dirent *dent1, *dent2;
size_t dirlen1, dirlen2;
char path1[MAXPATHLEN], path2[MAXPATHLEN];
char *dirbuf1, *dirbuf2;
int pos;
dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1));
if (dirlen1 >= sizeof(path1) - 1) {
warnx("%s: %s", p1, strerror(ENAMETOOLONG));
status = 2;
return;
}
if (path1[dirlen1 - 1] != '/') {
path1[dirlen1++] = '/';
path1[dirlen1] = '\0';
}
dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2));
if (dirlen2 >= sizeof(path2) - 1) {
warnx("%s: %s", p2, strerror(ENAMETOOLONG));
status = 2;
return;
}
if (path2[dirlen2 - 1] != '/') {
path2[dirlen2++] = '/';
path2[dirlen2] = '\0';
}
/* get a list of the entries in each directory */
dp1 = dirp1 = slurpdir(path1, &dirbuf1, Nflag + Pflag);
dp2 = dirp2 = slurpdir(path2, &dirbuf2, Nflag);
if (dirp1 == NULL || dirp2 == NULL)
return;
/*
* If we were given a starting point, find it.
*/
if (start != NULL) {
while (*dp1 != NULL && strcmp((*dp1)->d_name, start) < 0)
dp1++;
while (*dp2 != NULL && strcmp((*dp2)->d_name, start) < 0)
dp2++;
}
/*
* Iterate through the two directory lists, diffing as we go.
*/
while (*dp1 != NULL || *dp2 != NULL) {
dent1 = *dp1;
dent2 = *dp2;
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 if (lflag)
dent1->d_status |= D_ONLY;
else
print_only(path1, dirlen1, dent1->d_name);
dp1++;
} else {
/* file only in second dir, only diff if -N or -P */
if (Nflag || Pflag)
diffit(dent2, path1, dirlen1, path2, dirlen2,
flags);
else if (lflag)
dent2->d_status |= D_ONLY;
else
print_only(path2, dirlen2, dent2->d_name);
dp2++;
}
}
if (lflag) {
path1[dirlen1] = '\0';
path2[dirlen2] = '\0';
for (dp1 = dirp1; (dent1 = *dp1) != NULL; dp1++) {
print_status(dent1->d_status, path1, path2,
dent1->d_name);
}
for (dp2 = dirp2; (dent2 = *dp2) != NULL; dp2++) {
if (dent2->d_status == D_ONLY)
print_status(dent2->d_status, path2, NULL,
dent2->d_name);
}
}
if (dirbuf1 != NULL) {
xfree(dirp1);
xfree(dirbuf1);
}
if (dirbuf2 != NULL) {
xfree(dirp2);
xfree(dirbuf2);
}
}
/*
* Read in a whole directory's worth of struct dirents, culling
* out the "excluded" ones.
* Returns an array of struct dirent *'s that point into the buffer
* returned via bufp. Caller is responsible for free()ing both of these.
*/
static struct dirent **
slurpdir(char *path, char **bufp, int enoentok)
{
char *buf, *ebuf, *cp;
size_t bufsize, have, need;
long base;
int fd, nbytes, entries;
struct stat sb;
struct dirent **dirlist, *dp;
*bufp = NULL;
if ((fd = open(path, O_RDONLY, 0644)) == -1) {
static struct dirent *dummy;
if (!enoentok || errno != ENOENT) {
warn("%s", path);
return (NULL);
}
return (&dummy);
}
if (fstat(fd, &sb) == -1) {
warn("%s", path);
close(fd);
return (NULL);
}
need = roundup(sb.st_blksize, sizeof(struct dirent));
have = bufsize = roundup(MAX(sb.st_size, sb.st_blksize),
sizeof(struct dirent)) + need;
ebuf = buf = xmalloc(bufsize);
do {
if (have < need) {
bufsize += need;
have += need;
cp = xrealloc(buf, 1, bufsize);
ebuf = cp + (ebuf - buf);
buf = cp;
}
nbytes = getdirentries(fd, ebuf, have, &base);
if (nbytes == -1) {
warn("%s", path);
xfree(buf);
close(fd);
return (NULL);
}
ebuf += nbytes;
have -= nbytes;
} while (nbytes != 0);
close(fd);
/*
* We now have all the directory entries in our buffer.
* However, in order to easily sort them we need to convert
* the buffer into an array.
*/
for (entries = 0, cp = buf; cp < ebuf; ) {
dp = (struct dirent *)cp;
if (dp->d_fileno != 0)
entries++;
if (dp->d_reclen <= 0)
break;
cp += dp->d_reclen;
}
dirlist = xcalloc(sizeof(*dirlist), entries + 1);
for (entries = 0, cp = buf; cp < ebuf; ) {
dp = (struct dirent *)cp;
if (dp->d_fileno != 0 && !excluded(dp->d_name)) {
dp->d_status = 0;
dirlist[entries++] = dp;
}
if (dp->d_reclen <= 0)
break;
cp += dp->d_reclen;
}
dirlist[entries] = NULL;
qsort(dirlist, entries, sizeof(struct dirent *), dircompare);
*bufp = buf;
return (dirlist);
}
/*
* Compare d_name in two dirent structures; for qsort(3).
*/
static int
dircompare(const void *vp1, const void *vp2)
{
struct dirent *dp1 = *((struct dirent **) vp1);
struct dirent *dp2 = *((struct dirent **) vp2);
return (strcmp(dp1->d_name, dp2->d_name));
}
/*
* 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, MAXPATHLEN - 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, MAXPATHLEN - 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 if (lflag)
dp->d_status |= D_COMMON;
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);
if (!lflag)
print_status(dp->d_status, path1, path2, NULL);
}
/*
* Exclude the given directory entry?
*/
static int
excluded(const char *entry)
{
struct excludes *excl;
/* always skip "." and ".." */
if (entry[0] == '.' &&
(entry[1] == '\0' || (entry[1] == '.' && entry[2] == '\0')))
return (1);
/* check excludes list */
for (excl = excludes_list; excl != NULL; excl = excl->next)
if (fnmatch(excl->pattern, entry, FNM_PATHNAME) == 0)
return (1);
return (0);
}