/*
* Output flags
*/
-#define D_HEADER 1 /* Print a header/footer between files */
-#define D_EMPTY1 2 /* Treat first file as empty (/dev/null) */
-#define D_EMPTY2 4 /* Treat second file as empty (/dev/null) */
+enum {
+ /* Print a header/footer between files */
+ /* D_HEADER = 1, - unused */
+ /* Treat file as empty (/dev/null) */
+ D_EMPTY1 = 2 * ENABLE_FEATURE_DIFF_DIR,
+ D_EMPTY2 = 4 * ENABLE_FEATURE_DIFF_DIR,
+};
/*
* Status values for print_status() and diffreg() return values
* D_BINARY - binary files differ
* D_COMMON - subdirectory common to both dirs
* D_ONLY - file only exists in one dir
- * D_MISMATCH1 - path1 a dir, path2 a file
- * D_MISMATCH2 - path1 a file, path2 a dir
+ * D_ISDIR1 - path1 a dir, path2 a file
+ * D_ISDIR2 - path1 a file, path2 a dir
* D_ERROR - error occurred
* D_SKIPPED1 - skipped path1 as it is a special file
* D_SKIPPED2 - skipped path2 as it is a special file
#define D_BINARY (1 << 1)
#define D_COMMON (1 << 2)
/*#define D_ONLY (1 << 3) - unused */
-#define D_MISMATCH1 (1 << 4)
-#define D_MISMATCH2 (1 << 5)
+#define D_ISDIR1 (1 << 4)
+#define D_ISDIR2 (1 << 5)
#define D_ERROR (1 << 6)
#define D_SKIPPED1 (1 << 7)
#define D_SKIPPED2 (1 << 8)
#define g_read_buf bb_common_bufsiz1
struct globals {
- USE_FEATURE_DIFF_DIR(char **dl;)
- USE_FEATURE_DIFF_DIR(int dl_count;)
- int status;
- /* This is the default number of lines of context. */
- int context;
- size_t max_context;
- char *start;
+ bool anychange;
+ smallint exit_status;
+ int opt_U_context;
+ size_t max_context; /* size of context_vec_start */
+ IF_FEATURE_DIFF_DIR(int dl_count;)
+ IF_FEATURE_DIFF_DIR(char **dl;)
+ char *opt_S_start;
const char *label1;
const char *label2;
- struct line *file[2];
- int *J; /* will be overlaid on class */
- int *class; /* will be overlaid on file[0] */
- int *klist; /* will be overlaid on file[0] after class */
- int *member; /* will be overlaid on file[1] */
+ int *J; /* will be overlaid on class */
int clen;
- int len[2];
- int pref, suff; /* length of prefix and suffix */
+ int pref, suff; /* length of prefix and suffix */
+ int nlen[2];
int slen[2];
- bool anychange;
- long *ixnew; /* will be overlaid on file[1] */
- long *ixold; /* will be overlaid on klist */
- struct cand *clist; /* merely a free storage pot for candidates */
- int clistlen; /* the length of clist */
- struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
+ int clistlen; /* the length of clist */
+ struct cand *clist; /* merely a free storage pot for candidates */
+ long *ixnew; /* will be overlaid on nfile[1] */
+ long *ixold; /* will be overlaid on klist */
+ struct line *nfile[2];
+ struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
struct context_vec *context_vec_start;
struct context_vec *context_vec_end;
struct context_vec *context_vec_ptr;
+ char *tempname1, *tempname2;
struct stat stb1, stb2;
};
#define G (*ptr_to_globals)
-#define dl (G.dl )
-#define dl_count (G.dl_count )
-#define context (G.context )
+#define anychange (G.anychange )
+#define exit_status (G.exit_status )
+#define opt_U_context (G.opt_U_context )
#define max_context (G.max_context )
-#define status (G.status )
-#define start (G.start )
+#define dl_count (G.dl_count )
+#define dl (G.dl )
+#define opt_S_start (G.opt_S_start )
#define label1 (G.label1 )
#define label2 (G.label2 )
-#define file (G.file )
#define J (G.J )
-#define class (G.class )
-#define klist (G.klist )
-#define member (G.member )
#define clen (G.clen )
-#define len (G.len )
#define pref (G.pref )
#define suff (G.suff )
+#define nlen (G.nlen )
#define slen (G.slen )
-#define anychange (G.anychange )
+#define clistlen (G.clistlen )
+#define clist (G.clist )
#define ixnew (G.ixnew )
#define ixold (G.ixold )
-#define clist (G.clist )
-#define clistlen (G.clistlen )
+#define nfile (G.nfile )
#define sfile (G.sfile )
#define context_vec_start (G.context_vec_start )
#define context_vec_end (G.context_vec_end )
#define context_vec_ptr (G.context_vec_ptr )
#define stb1 (G.stb1 )
#define stb2 (G.stb2 )
+#define tempname1 (G.tempname1 )
+#define tempname2 (G.tempname2 )
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
- context = 3; \
+ opt_U_context = 3; \
max_context = 64; \
} while (0)
-/*static void print_only(const char *path, size_t dirlen, const char *entry)*/
+#if ENABLE_FEATURE_DIFF_DIR
static void print_only(const char *path, const char *entry)
{
printf("Only in %s: %s\n", path, entry);
}
+#endif
-/*static void print_status(int val, char *path1, char *path2, char *entry)*/
static void print_status(int val, char *_path1, char *_path2)
{
/*const char *const _entry = entry ? entry : "";*/
if (option_mask32 & FLAG_s)
printf("Files %s and %s are identical\n", _path1, _path2);
break;
- case D_MISMATCH1:
+ case D_ISDIR1:
printf("File %s is a %s while file %s is a %s\n",
_path1, "directory", _path2, "regular file");
break;
- case D_MISMATCH2:
+ case D_ISDIR2:
printf("File %s is a %s while file %s is a %s\n",
_path1, "regular file", _path2, "directory");
break;
}
+/* Our diff implementation is using seek.
+ * When we meet non-seekable file, we must make a temp copy.
+ */
+static char *make_temp(FILE *f, struct stat *sb)
+{
+ char *name;
+ int fd;
+
+ if (S_ISREG(sb->st_mode) || S_ISBLK(sb->st_mode))
+ return NULL;
+ name = xstrdup("/tmp/difXXXXXX");
+ fd = mkstemp(name);
+ if (fd < 0)
+ bb_perror_msg_and_die("mkstemp");
+ if (bb_copyfd_eof(fileno(f), fd) < 0) {
+ clean_up:
+ unlink(name);
+ xfunc_die(); /* error message is printed by bb_copyfd_eof */
+ }
+ fstat(fd, sb);
+ close(fd);
+ if (freopen(name, "r+", f) == NULL) {
+ bb_perror_msg("freopen");
+ goto clean_up;
+ }
+ return name;
+}
+
+
/*
* Check to see if the given files differ.
* Returns 0 if they are the same, 1 if different, and -1 on error.
*/
-static NOINLINE int files_differ(FILE *f1, FILE *f2, int flags)
+static NOINLINE int files_differ(FILE *f1, FILE *f2)
{
size_t i, j;
- if ((flags & (D_EMPTY1 | D_EMPTY2)) || stb1.st_size != stb2.st_size
- || (stb1.st_mode & S_IFMT) != (stb2.st_mode & S_IFMT)
- ) {
+ /* Prevent making copies for "/dev/null" (too common) */
+ /* Deal with input from pipes etc */
+ tempname1 = make_temp(f1, &stb1);
+ tempname2 = make_temp(f2, &stb2);
+ if (stb1.st_size != stb2.st_size) {
return 1;
}
while (1) {
}
p[++j].value = h;
}
- len[i] = j;
- file[i] = p;
+ nlen[i] = j;
+ nfile[i] = p;
}
{
int i, j;
- for (pref = 0; pref < len[0] && pref < len[1] &&
- file[0][pref + 1].value == file[1][pref + 1].value; pref++)
+ for (pref = 0; pref < nlen[0] && pref < nlen[1] &&
+ nfile[0][pref + 1].value == nfile[1][pref + 1].value; pref++)
continue;
- for (suff = 0; suff < len[0] - pref && suff < len[1] - pref &&
- file[0][len[0] - suff].value == file[1][len[1] - suff].value;
- suff++)
+ for (suff = 0; suff < nlen[0] - pref && suff < nlen[1] - pref &&
+ nfile[0][nlen[0] - suff].value == nfile[1][nlen[1] - suff].value;
+ suff++)
continue;
for (j = 0; j < 2; j++) {
- sfile[j] = file[j] + pref;
- slen[j] = len[j] - pref - suff;
+ sfile[j] = nfile[j] + pref;
+ slen[j] = nlen[j] - pref - suff;
for (i = 0; i <= slen[j]; i++)
sfile[j][i].serial = i;
}
struct cand *q;
int i;
- for (i = 0; i <= len[0]; i++)
- J[i] = i <= pref ? i : i > len[0] - suff ? i + len[1] - len[0] : 0;
+ for (i = 0; i <= nlen[0]; i++)
+ J[i] = i <= pref ? i : i > nlen[0] - suff ? i + nlen[1] - nlen[0] : 0;
for (q = clist + p; q->y != 0; q = clist + q->pred)
J[q->x + pref] = q->y + pref;
}
ixold[0] = ixnew[0] = 0;
jackpot = 0;
ctold = ctnew = 0;
- for (i = 1; i <= len[0]; i++) {
+ for (i = 1; i <= nlen[0]; i++) {
if (J[i] == 0) {
ixold[i] = ctold += skipline(f1);
continue;
J[i] = 0;
if (c != '\n' && c != EOF)
ctold += skipline(f1);
-// BUG? Should be "if (d != '\n' && d != EOF)" ?
- if (d != '\n' && c != EOF)
+/* was buggy? "if (d != '\n' && c != EOF)" */
+ if (d != '\n' && d != EOF)
ctnew += skipline(f2);
break;
}
ixnew[j] = ctnew;
j++;
}
- for (; j <= len[1]; j++)
+ for (; j <= nlen[1]; j++)
ixnew[j] = ctnew += skipline(f2);
}
return;
b = d = 0; /* gcc */
- lowa = MAX(1, cvp->a - context);
- upb = MIN(len[0], context_vec_ptr->b + context);
- lowc = MAX(1, cvp->c - context);
- upd = MIN(len[1], context_vec_ptr->d + context);
+ lowa = MAX(1, cvp->a - opt_U_context);
+ upb = MIN(nlen[0], context_vec_ptr->b + opt_U_context);
+ lowc = MAX(1, cvp->c - opt_U_context);
+ upd = MIN(nlen[1], context_vec_ptr->d + opt_U_context);
printf("@@ -");
uni_range(lowa, upb);
* lines appended (beginning at b). If c is greater than d then there are
* lines missing from the to file.
*/
-static void change(char *file1, FILE *f1, char *file2, FILE *f2,
+static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
int a, int b, int c, int d)
{
if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
* Print the context/unidiff header first time through.
*/
print_header(file1, file2);
- } else if (a > context_vec_ptr->b + (2 * context) + 1
- && c > context_vec_ptr->d + (2 * context) + 1
+ } else if (a > context_vec_ptr->b + (2 * opt_U_context) + 1
+ && c > context_vec_ptr->d + (2 * opt_U_context) + 1
) {
/*
* If this change is more than 'context' lines from the
}
-static void output(char *file1, FILE *f1, char *file2, FILE *f2)
+static void output(const char *file1, FILE *f1, const char *file2, FILE *f2)
{
/* Note that j0 and j1 can't be used as they are defined in math.h.
* This also allows the rather amusing variable 'j00'... */
rewind(f1);
rewind(f2);
- m = len[0];
+ m = nlen[0];
J[0] = 0;
- J[m + 1] = len[1] + 1;
+ J[m + 1] = nlen[1] + 1;
for (i0 = 1; i0 <= m; i0 = i1 + 1) {
while (i0 <= m && J[i0] == J[i0 - 1] + 1)
i0++;
}
if (m == 0) {
// change() seeks!
- change(file1, f1, file2, f2, 1, 0, 1, len[1]);
+ change(file1, f1, file2, f2, 1, 0, 1, nlen[1]);
}
if (anychange != 0 && !(option_mask32 & FLAG_q)) {
// dump_unified_vec() seeks!
* 3*(number of k-candidates installed), typically about
* 6n words for files of length n.
*/
-static unsigned diffreg(char *file1, char *file2, int flags)
+/* NB: files can be not REGular. The only sure thing that they
+ * are not both DIRectories. */
+static unsigned diffreg(const char *file1, const char *file2, int flags)
{
+ int *member; /* will be overlaid on nfile[1] */
+ int *class; /* will be overlaid on nfile[0] */
+ int *klist; /* will be overlaid on nfile[0] after class */
FILE *f1;
FILE *f2;
unsigned rval;
anychange = 0;
context_vec_ptr = context_vec_start - 1;
+ tempname1 = tempname2 = NULL;
+ /* Is any of them a directory? Then it's simple */
if (S_ISDIR(stb1.st_mode) != S_ISDIR(stb2.st_mode))
- return (S_ISDIR(stb1.st_mode) ? D_MISMATCH1 : D_MISMATCH2);
-
- if (LONE_DASH(file1) && LONE_DASH(file2))
- return D_SAME;
+ return (S_ISDIR(stb1.st_mode) ? D_ISDIR1 : D_ISDIR2);
+ /* None of them are directories */
rval = D_SAME;
if (flags & D_EMPTY1)
- f1 = xfopen(bb_dev_null, "r");
- else
- f1 = xfopen_stdin(file1);
+ /* can't be stdin, but xfopen_stdin() is smaller code */
+ file1 = bb_dev_null;
+ f1 = xfopen_stdin(file1);
if (flags & D_EMPTY2)
- f2 = xfopen(bb_dev_null, "r");
- else
- f2 = xfopen_stdin(file2);
-
-/* We can't diff non-seekable stream - we use rewind(), fseek().
- * This can be fixed (volunteers?).
- * Meanwhile we should check it here by stat'ing input fds,
- * but I am lazy and check that in main() instead.
- * Check in main won't catch "diffing fifos buried in subdirectories"
- * failure scenario - not very likely in real life... */
-
- /* Quick check whether they are different */
- i = files_differ(f1, f2, flags);
- if (i == 0)
- goto closem;
- else if (i != 1) { /* 1 == ok */
- /* error */
- status |= 2;
- goto closem;
+ file2 = bb_dev_null;
+ f2 = xfopen_stdin(file2);
+
+ /* NB: if D_EMPTY1/2 is set, other file is always a regular file,
+ * not pipe/fifo/chardev/etc - D_EMPTY is used by "diff -r" only,
+ * and it never diffs non-ordinary files in subdirs. */
+ if (!(flags & (D_EMPTY1 | D_EMPTY2))) {
+ /* Quick check whether they are different */
+ /* NB: copies non-REG files to tempfiles and fills tempname1/2 */
+ i = files_differ(f1, f2);
+ if (i != 1) { /* not different? */
+ if (i != 0) /* error? */
+ exit_status |= 2;
+ goto closem;
+ }
}
if (!asciifile(f1) || !asciifile(f2)) {
rval = D_BINARY;
- status |= 1;
+ exit_status |= 1;
goto closem;
}
sort(sfile[0], slen[0]);
sort(sfile[1], slen[1]);
- member = (int *) file[1];
+ member = (int *) nfile[1];
equiv(sfile[0], slen[0], sfile[1], slen[1], member);
+//TODO: xrealloc_vector?
member = xrealloc(member, (slen[1] + 2) * sizeof(int));
- class = (int *) file[0];
+ class = (int *) nfile[0];
unsort(sfile[0], slen[0], class);
class = xrealloc(class, (slen[0] + 2) * sizeof(int));
free(member);
free(class);
- J = xrealloc(J, (len[0] + 2) * sizeof(int));
+ J = xrealloc(J, (nlen[0] + 2) * sizeof(int));
unravel(klist[i]);
free(clist);
free(klist);
- ixold = xrealloc(ixold, (len[0] + 2) * sizeof(long));
- ixnew = xrealloc(ixnew, (len[1] + 2) * sizeof(long));
+ ixold = xrealloc(ixold, (nlen[0] + 2) * sizeof(long));
+ ixnew = xrealloc(ixnew, (nlen[1] + 2) * sizeof(long));
// Rewind inside!
check(f1, f2);
// Rewind inside!
closem:
if (anychange) {
- status |= 1;
+ exit_status |= 1;
if (rval == D_SAME)
rval = D_DIFFER;
}
fclose_if_not_stdin(f1);
fclose_if_not_stdin(f2);
+ if (tempname1) {
+ unlink(tempname1);
+ free(tempname1);
+ }
+ if (tempname2) {
+ unlink(tempname2);
+ free(tempname2);
+ }
return rval;
}
#if ENABLE_FEATURE_DIFF_DIR
static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
{
- int flags = D_HEADER;
+ int flags = 0; /*D_HEADER;*/
int val;
char *fullpath1 = NULL; /* if -N */
char *fullpath2 = NULL;
val = D_SKIPPED1;
else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
val = D_SKIPPED2;
- else
+ else {
+ /* Both files are either REGular or DIRectories */
val = diffreg(fullpath1, fullpath2, flags);
+ }
print_status(val, fullpath1, fullpath2 /*, NULL*/);
ret:
#if ENABLE_FEATURE_DIFF_DIR
/* This function adds a filename to dl, the directory listing. */
-static int add_to_dirlist(const char *filename,
- struct stat ATTRIBUTE_UNUSED *sb,
+static int FAST_FUNC add_to_dirlist(const char *filename,
+ struct stat *sb UNUSED_PARAM,
void *userdata,
- int depth ATTRIBUTE_UNUSED)
+ int depth UNUSED_PARAM)
{
- /* +2: with space for eventual trailing NULL */
- dl = xrealloc(dl, (dl_count+2) * sizeof(dl[0]));
+ dl = xrealloc_vector(dl, 5, dl_count);
dl[dl_count] = xstrdup(filename + (int)(ptrdiff_t)userdata);
dl_count++;
return TRUE;
/* This returns a sorted directory listing. */
-static char **get_dir(char *path)
+static char **get_recursive_dirlist(char *path)
{
dl_count = 0;
dl = xzalloc(sizeof(dl[0]));
- /* If -r has been set, then the recursive_action function will be
- * used. Unfortunately, this outputs the root directory along with
- * the recursed paths, so use void *userdata to specify the string
- * length of the root directory - '(void*)(strlen(path)+)'.
- * add_to_dirlist then removes root dir prefix. */
-
+ /* We need to trim root directory prefix.
+ * Using void *userdata to specify its length,
+ * add_to_dirlist will remove it. */
if (option_mask32 & FLAG_r) {
recursive_action(path, ACTION_RECURSE|ACTION_FOLLOWLINKS,
- add_to_dirlist, NULL,
- (void*)(strlen(path)+1), 0);
+ add_to_dirlist, /* file_action */
+ NULL, /* dir_action */
+ (void*)(ptrdiff_t)(strlen(path) + 1),
+ 0);
} else {
DIR *dp;
struct dirent *ep;
*dp2 = '\0';
/* Get directory listings for p1 and p2. */
- dirlist1 = get_dir(p1);
- dirlist2 = get_dir(p2);
+ dirlist1 = get_recursive_dirlist(p1);
+ dirlist2 = get_recursive_dirlist(p2);
/* If -S was set, find the starting point. */
- if (start) {
- while (*dirlist1 != NULL && strcmp(*dirlist1, start) < 0)
+ if (opt_S_start) {
+ while (*dirlist1 != NULL && strcmp(*dirlist1, opt_S_start) < 0)
dirlist1++;
- while (*dirlist2 != NULL && strcmp(*dirlist2, start) < 0)
+ while (*dirlist2 != NULL && strcmp(*dirlist2, opt_S_start) < 0)
dirlist2++;
if ((*dirlist1 == NULL) || (*dirlist2 == NULL))
bb_error_msg(bb_msg_invalid_arg, "NULL", "-S");
while (*dirlist1 != NULL || *dirlist2 != NULL) {
dp1 = *dirlist1;
dp2 = *dirlist2;
- pos = dp1 == NULL ? 1 : dp2 == NULL ? -1 : strcmp(dp1, dp2);
+ pos = dp1 == NULL ? 1 : (dp2 == NULL ? -1 : strcmp(dp1, dp2));
if (pos == 0) {
do_diff(p1, dp1, p2, dp2);
dirlist1++;
int diff_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int diff_main(int argc ATTRIBUTE_UNUSED, char **argv)
+int diff_main(int argc UNUSED_PARAM, char **argv)
{
- bool gotstdin = 0;
+ int gotstdin = 0;
char *f1, *f2;
llist_t *L_arg = NULL;
opt_complementary = "=2:L::U+";
getopt32(argv, "abdiL:NqrsS:tTU:wu"
"p" /* ignored (for compatibility) */,
- &L_arg, &start, &context);
+ &L_arg, &opt_S_start, &opt_U_context);
/*argc -= optind;*/
argv += optind;
while (L_arg) {
if (label1 && label2)
bb_show_usage();
- if (!label1)
- label1 = L_arg->data;
- else { /* then label2 is NULL */
+ if (label1) /* then label2 is NULL */
label2 = label1;
- label1 = L_arg->data;
- }
- /* we leak L_arg here... */
- L_arg = L_arg->link;
+ label1 = llist_pop(&L_arg);
}
/*
*/
f1 = argv[0];
f2 = argv[1];
+ /* Compat: "diff file name_which_doesnt_exist" exits with 2 */
+ xfunc_error_retval = 2;
if (LONE_DASH(f1)) {
fstat(STDIN_FILENO, &stb1);
- gotstdin = 1;
+ gotstdin++;
} else
xstat(f1, &stb1);
if (LONE_DASH(f2)) {
fstat(STDIN_FILENO, &stb2);
- gotstdin = 1;
+ gotstdin++;
} else
xstat(f2, &stb2);
+ xfunc_error_retval = 1;
+
if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
- bb_error_msg_and_die("can't compare - to a directory");
+ bb_error_msg_and_die("can't compare stdin to a directory");
+
if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
#if ENABLE_FEATURE_DIFF_DIR
diffdir(f1, f2);
+ return exit_status;
#else
- bb_error_msg_and_die("directory comparison not supported");
+ bb_error_msg_and_die("no support for directory comparison");
#endif
- } else {
- if (S_ISDIR(stb1.st_mode)) {
- f1 = concat_path_file(f1, f2);
- xstat(f1, &stb1);
- }
- if (S_ISDIR(stb2.st_mode)) {
- f2 = concat_path_file(f2, f1);
- xstat(f2, &stb2);
- }
-/* XXX: FIXME: */
-/* We can't diff e.g. stdin supplied by a pipe - we use rewind(), fseek().
- * This can be fixed (volunteers?) */
- if (!S_ISREG(stb1.st_mode) || !S_ISREG(stb2.st_mode))
- bb_error_msg_and_die("can't diff non-seekable stream");
- print_status(diffreg(f1, f2, 0), f1, f2 /*, NULL*/);
}
- return status;
+
+ if (S_ISDIR(stb1.st_mode)) { /* "diff dir file" */
+ /* NB: "diff dir dir2/dir3/file" must become
+ * "diff dir/file dir2/dir3/file" */
+ char *slash = strrchr(f2, '/');
+ f1 = concat_path_file(f1, slash ? slash + 1 : f2);
+ xstat(f1, &stb1);
+ }
+ if (S_ISDIR(stb2.st_mode)) {
+ char *slash = strrchr(f1, '/');
+ f2 = concat_path_file(f2, slash ? slash + 1 : f1);
+ xstat(f2, &stb2);
+ }
+
+ /* diffreg can get non-regular files here,
+ * they are not both DIRestories */
+ print_status((gotstdin > 1 ? D_SAME : diffreg(f1, f2, 0)),
+ f1, f2 /*, NULL*/);
+ return exit_status;
}
projects / oweals / busybox.git / blobdiff