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-rw-r--r--editors/Config.in39
-rw-r--r--editors/Kbuild2
-rw-r--r--editors/cmp.c145
-rw-r--r--editors/diff.c1282
4 files changed, 1468 insertions, 0 deletions
diff --git a/editors/Config.in b/editors/Config.in
index 936004c9b..3361d89f1 100644
--- a/editors/Config.in
+++ b/editors/Config.in
@@ -20,6 +20,45 @@ config FEATURE_AWK_MATH
20 Enable math functions of the Awk programming language. 20 Enable math functions of the Awk programming language.
21 NOTE: This will require libm to be present for linking. 21 NOTE: This will require libm to be present for linking.
22 22
23config CMP
24 bool "cmp"
25 default n
26 help
27 cmp is used to compare two files and returns the result
28 to standard output.
29
30config DIFF
31 bool "diff"
32 default n
33 help
34 diff compares two files or directories and outputs the
35 differences between them in a form that can be given to
36 the patch command.
37
38config FEATURE_DIFF_BINARY
39 bool "Enable checks for binary files"
40 default y
41 depends on DIFF
42 help
43 This option enables support for checking for binary files
44 before a comparison is carried out.
45
46config FEATURE_DIFF_DIR
47 bool "Enable directory support"
48 default y
49 depends on DIFF
50 help
51 This option enables support for directory and subdirectory
52 comparison.
53
54config FEATURE_DIFF_MINIMAL
55 bool "Enable -d option to find smaller sets of changes"
56 default n
57 depends on DIFF
58 help
59 Enabling this option allows the use of -d to make diff
60 try hard to find the smallest possible set of changes.
61
23config ED 62config ED
24 bool "ed" 63 bool "ed"
25 default n 64 default n
diff --git a/editors/Kbuild b/editors/Kbuild
index d991e1faf..76302aa76 100644
--- a/editors/Kbuild
+++ b/editors/Kbuild
@@ -6,6 +6,8 @@
6 6
7lib-y:= 7lib-y:=
8lib-$(CONFIG_AWK) += awk.o 8lib-$(CONFIG_AWK) += awk.o
9lib-$(CONFIG_CMP) += cmp.o
10lib-$(CONFIG_DIFF) += diff.o
9lib-$(CONFIG_ED) += ed.o 11lib-$(CONFIG_ED) += ed.o
10lib-$(CONFIG_PATCH) += patch.o 12lib-$(CONFIG_PATCH) += patch.o
11lib-$(CONFIG_SED) += sed.o 13lib-$(CONFIG_SED) += sed.o
diff --git a/editors/cmp.c b/editors/cmp.c
new file mode 100644
index 000000000..e5dda80ff
--- /dev/null
+++ b/editors/cmp.c
@@ -0,0 +1,145 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini cmp implementation for busybox
4 *
5 * Copyright (C) 2000,2001 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10/* BB_AUDIT SUSv3 (virtually) compliant -- uses nicer GNU format for -l. */
11/* http://www.opengroup.org/onlinepubs/007904975/utilities/cmp.html */
12
13/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
14 *
15 * Original version majorly reworked for SUSv3 compliance, bug fixes, and
16 * size optimizations. Changes include:
17 * 1) Now correctly distinguishes between errors and actual file differences.
18 * 2) Proper handling of '-' args.
19 * 3) Actual error checking of i/o.
20 * 4) Accept SUSv3 -l option. Note that we use the slightly nicer gnu format
21 * in the '-l' case.
22 */
23
24#include "libbb.h"
25
26static FILE *cmp_xfopen_input(const char *filename)
27{
28 FILE *fp;
29
30 fp = fopen_or_warn_stdin(filename);
31 if (fp)
32 return fp;
33 xfunc_die(); /* We already output an error message. */
34}
35
36static const char fmt_eof[] = "cmp: EOF on %s\n";
37static const char fmt_differ[] = "%s %s differ: char %"OFF_FMT"d, line %d\n";
38// This fmt_l_opt uses gnu-isms. SUSv3 would be "%.0s%.0s%"OFF_FMT"d %o %o\n"
39static const char fmt_l_opt[] = "%.0s%.0s%"OFF_FMT"d %3o %3o\n";
40
41static const char opt_chars[] = "sl";
42#define CMP_OPT_s (1<<0)
43#define CMP_OPT_l (1<<1)
44
45int cmp_main(int argc, char **argv);
46int cmp_main(int argc, char **argv)
47{
48 FILE *fp1, *fp2, *outfile = stdout;
49 const char *filename1, *filename2 = "-";
50 USE_DESKTOP(off_t skip1 = 0, skip2 = 0;)
51 off_t char_pos = 0;
52 int line_pos = 1; /* Hopefully won't overflow... */
53 const char *fmt;
54 int c1, c2;
55 unsigned opt;
56 int retval = 0;
57
58 xfunc_error_retval = 2; /* 1 is returned if files are different. */
59
60 opt_complementary = "?:-1"
61 USE_DESKTOP(":?4")
62 SKIP_DESKTOP(":?2")
63 ":l--s:s--l";
64 opt = getopt32(argc, argv, opt_chars);
65 argv += optind;
66
67 filename1 = *argv;
68 fp1 = cmp_xfopen_input(filename1);
69
70 if (*++argv) {
71 filename2 = *argv;
72#if ENABLE_DESKTOP
73 if (*++argv) {
74 skip1 = XATOOFF(*argv);
75 if (*++argv) {
76 skip2 = XATOOFF(*argv);
77 }
78 }
79#endif
80 }
81
82 fp2 = cmp_xfopen_input(filename2);
83 if (fp1 == fp2) { /* Paranoia check... stdin == stdin? */
84 /* Note that we don't bother reading stdin. Neither does gnu wc.
85 * But perhaps we should, so that other apps down the chain don't
86 * get the input. Consider 'echo hello | (cmp - - && cat -)'.
87 */
88 return 0;
89 }
90
91 if (opt & CMP_OPT_l)
92 fmt = fmt_l_opt;
93 else
94 fmt = fmt_differ;
95
96#if ENABLE_DESKTOP
97 while (skip1) { getc(fp1); skip1--; }
98 while (skip2) { getc(fp2); skip2--; }
99#endif
100 do {
101 c1 = getc(fp1);
102 c2 = getc(fp2);
103 ++char_pos;
104 if (c1 != c2) { /* Remember: a read error may have occurred. */
105 retval = 1; /* But assume the files are different for now. */
106 if (c2 == EOF) {
107 /* We know that fp1 isn't at EOF or in an error state. But to
108 * save space below, things are setup to expect an EOF in fp1
109 * if an EOF occurred. So, swap things around.
110 */
111 fp1 = fp2;
112 filename1 = filename2;
113 c1 = c2;
114 }
115 if (c1 == EOF) {
116 die_if_ferror(fp1, filename1);
117 fmt = fmt_eof; /* Well, no error, so it must really be EOF. */
118 outfile = stderr;
119 /* There may have been output to stdout (option -l), so
120 * make sure we fflush before writing to stderr. */
121 xfflush_stdout();
122 }
123 if (!(opt & CMP_OPT_s)) {
124 if (opt & CMP_OPT_l) {
125 line_pos = c1; /* line_pos is unused in the -l case. */
126 }
127 fprintf(outfile, fmt, filename1, filename2, char_pos, line_pos, c2);
128 if (opt) { /* This must be -l since not -s. */
129 /* If we encountered an EOF,
130 * the while check will catch it. */
131 continue;
132 }
133 }
134 break;
135 }
136 if (c1 == '\n') {
137 ++line_pos;
138 }
139 } while (c1 != EOF);
140
141 die_if_ferror(fp1, filename1);
142 die_if_ferror(fp2, filename2);
143
144 fflush_stdout_and_exit(retval);
145}
diff --git a/editors/diff.c b/editors/diff.c
new file mode 100644
index 000000000..830c15ea6
--- /dev/null
+++ b/editors/diff.c
@@ -0,0 +1,1282 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini diff implementation for busybox, adapted from OpenBSD diff.
4 *
5 * Copyright (C) 2006 by Robert Sullivan <cogito.ergo.cogito@hotmail.com>
6 * Copyright (c) 2003 Todd C. Miller <Todd.Miller@courtesan.com>
7 *
8 * Sponsored in part by the Defense Advanced Research Projects
9 * Agency (DARPA) and Air Force Research Laboratory, Air Force
10 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
11 *
12 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 */
14
15#include "libbb.h"
16
17#define FSIZE_MAX 32768
18
19/*
20 * Output flags
21 */
22#define D_HEADER 1 /* Print a header/footer between files */
23#define D_EMPTY1 2 /* Treat first file as empty (/dev/null) */
24#define D_EMPTY2 4 /* Treat second file as empty (/dev/null) */
25
26/*
27 * Status values for print_status() and diffreg() return values
28 * Guide:
29 * D_SAME - files are the same
30 * D_DIFFER - files differ
31 * D_BINARY - binary files differ
32 * D_COMMON - subdirectory common to both dirs
33 * D_ONLY - file only exists in one dir
34 * D_MISMATCH1 - path1 a dir, path2 a file
35 * D_MISMATCH2 - path1 a file, path2 a dir
36 * D_ERROR - error occurred
37 * D_SKIPPED1 - skipped path1 as it is a special file
38 * D_SKIPPED2 - skipped path2 as it is a special file
39 */
40
41#define D_SAME 0
42#define D_DIFFER (1<<0)
43#define D_BINARY (1<<1)
44#define D_COMMON (1<<2)
45#define D_ONLY (1<<3)
46#define D_MISMATCH1 (1<<4)
47#define D_MISMATCH2 (1<<5)
48#define D_ERROR (1<<6)
49#define D_SKIPPED1 (1<<7)
50#define D_SKIPPED2 (1<<8)
51
52/* Command line options */
53#define FLAG_a (1<<0)
54#define FLAG_b (1<<1)
55#define FLAG_d (1<<2)
56#define FLAG_i (1<<3)
57#define FLAG_L (1<<4)
58#define FLAG_N (1<<5)
59#define FLAG_q (1<<6)
60#define FLAG_r (1<<7)
61#define FLAG_s (1<<8)
62#define FLAG_S (1<<9)
63#define FLAG_t (1<<10)
64#define FLAG_T (1<<11)
65#define FLAG_U (1<<12)
66#define FLAG_w (1<<13)
67
68struct cand {
69 int x;
70 int y;
71 int pred;
72};
73
74struct line {
75 int serial;
76 int value;
77};
78
79/*
80 * The following struct is used to record change information
81 * doing a "context" or "unified" diff. (see routine "change" to
82 * understand the highly mnemonic field names)
83 */
84struct context_vec {
85 int a; /* start line in old file */
86 int b; /* end line in old file */
87 int c; /* start line in new file */
88 int d; /* end line in new file */
89};
90
91struct globals {
92 USE_FEATURE_DIFF_DIR(char **dl;)
93 USE_FEATURE_DIFF_DIR(int dl_count;)
94 /* This is the default number of lines of context. */
95 int context;
96 size_t max_context;
97 int status;
98 char *start;
99 const char *label1;
100 const char *label2;
101 struct line *file[2];
102 int *J; /* will be overlaid on class */
103 int *class; /* will be overlaid on file[0] */
104 int *klist; /* will be overlaid on file[0] after class */
105 int *member; /* will be overlaid on file[1] */
106 int clen;
107 int len[2];
108 int pref, suff; /* length of prefix and suffix */
109 int slen[2];
110 bool anychange;
111 long *ixnew; /* will be overlaid on file[1] */
112 long *ixold; /* will be overlaid on klist */
113 struct cand *clist; /* merely a free storage pot for candidates */
114 int clistlen; /* the length of clist */
115 struct line *sfile[2]; /* shortened by pruning common prefix/suffix */
116 struct context_vec *context_vec_start;
117 struct context_vec *context_vec_end;
118 struct context_vec *context_vec_ptr;
119 struct stat stb1, stb2;
120};
121#define G (*ptr_to_globals)
122#define dl (G.dl )
123#define dl_count (G.dl_count )
124#define context (G.context )
125#define max_context (G.max_context )
126#define status (G.status )
127#define start (G.start )
128#define label1 (G.label1 )
129#define label2 (G.label2 )
130#define file (G.file )
131#define J (G.J )
132#define class (G.class )
133#define klist (G.klist )
134#define member (G.member )
135#define clen (G.clen )
136#define len (G.len )
137#define pref (G.pref )
138#define suff (G.suff )
139#define slen (G.slen )
140#define anychange (G.anychange )
141#define ixnew (G.ixnew )
142#define ixold (G.ixold )
143#define clist (G.clist )
144#define clistlen (G.clistlen )
145#define sfile (G.sfile )
146#define context_vec_start (G.context_vec_start )
147#define context_vec_end (G.context_vec_end )
148#define context_vec_ptr (G.context_vec_ptr )
149#define stb1 (G.stb1 )
150#define stb2 (G.stb2 )
151#define INIT_G() do { \
152 PTR_TO_GLOBALS = xzalloc(sizeof(G)); \
153 context = 3; \
154 max_context = 64; \
155} while (0)
156
157
158static void print_only(const char *path, size_t dirlen, const char *entry)
159{
160 if (dirlen > 1)
161 dirlen--;
162 printf("Only in %.*s: %s\n", (int) dirlen, path, entry);
163}
164
165static void print_status(int val, char *path1, char *path2, char *entry)
166{
167 const char * const _entry = entry ? entry : "";
168 char * const _path1 = entry ? concat_path_file(path1, _entry) : path1;
169 char * const _path2 = entry ? concat_path_file(path2, _entry) : path2;
170
171 switch (val) {
172 case D_ONLY:
173 print_only(path1, strlen(path1), entry);
174 break;
175 case D_COMMON:
176 printf("Common subdirectories: %s and %s\n", _path1, _path2);
177 break;
178 case D_BINARY:
179 printf("Binary files %s and %s differ\n", _path1, _path2);
180 break;
181 case D_DIFFER:
182 if (option_mask32 & FLAG_q)
183 printf("Files %s and %s differ\n", _path1, _path2);
184 break;
185 case D_SAME:
186 if (option_mask32 & FLAG_s)
187 printf("Files %s and %s are identical\n", _path1, _path2);
188 break;
189 case D_MISMATCH1:
190 printf("File %s is a %s while file %s is a %s\n",
191 _path1, "directory", _path2, "regular file");
192 break;
193 case D_MISMATCH2:
194 printf("File %s is a %s while file %s is a %s\n",
195 _path1, "regular file", _path2, "directory");
196 break;
197 case D_SKIPPED1:
198 printf("File %s is not a regular file or directory and was skipped\n",
199 _path1);
200 break;
201 case D_SKIPPED2:
202 printf("File %s is not a regular file or directory and was skipped\n",
203 _path2);
204 break;
205 }
206 if (entry) {
207 free(_path1);
208 free(_path2);
209 }
210}
211static void fiddle_sum(int *sum, int t)
212{
213 *sum = (int)(*sum * 127 + t);
214}
215/*
216 * Hash function taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578.
217 */
218static int readhash(FILE * f)
219{
220 int i, t, space;
221 int sum;
222
223 sum = 1;
224 space = 0;
225 if (!(option_mask32 & (FLAG_b | FLAG_w))) {
226 for (i = 0; (t = getc(f)) != '\n'; i++) {
227 if (t == EOF) {
228 if (i == 0)
229 return 0;
230 break;
231 }
232 fiddle_sum(&sum, t);
233 }
234 } else {
235 for (i = 0;;) {
236 switch (t = getc(f)) {
237 case '\t':
238 case '\r':
239 case '\v':
240 case '\f':
241 case ' ':
242 space++;
243 continue;
244 default:
245 if (space && !(option_mask32 & FLAG_w)) {
246 i++;
247 space = 0;
248 }
249 fiddle_sum(&sum, t);
250 i++;
251 continue;
252 case EOF:
253 if (i == 0)
254 return 0;
255 /* FALLTHROUGH */
256 case '\n':
257 break;
258 }
259 break;
260 }
261 }
262 /*
263 * There is a remote possibility that we end up with a zero sum.
264 * Zero is used as an EOF marker, so return 1 instead.
265 */
266 return (sum == 0 ? 1 : sum);
267}
268
269
270/*
271 * Check to see if the given files differ.
272 * Returns 0 if they are the same, 1 if different, and -1 on error.
273 */
274static int files_differ(FILE * f1, FILE * f2, int flags)
275{
276 size_t i, j;
277
278 if ((flags & (D_EMPTY1 | D_EMPTY2)) || stb1.st_size != stb2.st_size
279 || (stb1.st_mode & S_IFMT) != (stb2.st_mode & S_IFMT)
280 ) {
281 return 1;
282 }
283 while (1) {
284 i = fread(bb_common_bufsiz1, 1, BUFSIZ/2, f1);
285 j = fread(bb_common_bufsiz1 + BUFSIZ/2, 1, BUFSIZ/2, f2);
286 if (i != j)
287 return 1;
288 if (i == 0)
289 return (ferror(f1) || ferror(f2));
290 if (memcmp(bb_common_bufsiz1,
291 bb_common_bufsiz1 + BUFSIZ/2, i) != 0)
292 return 1;
293 }
294}
295
296
297static void prepare(int i, FILE * fd, off_t filesize)
298{
299 struct line *p;
300 int h;
301 size_t j, sz;
302
303 rewind(fd);
304
305 sz = (filesize <= FSIZE_MAX ? filesize : FSIZE_MAX) / 25;
306 if (sz < 100)
307 sz = 100;
308
309 p = xmalloc((sz + 3) * sizeof(struct line));
310 j = 0;
311 while ((h = readhash(fd))) {
312 if (j == sz) {
313 sz = sz * 3 / 2;
314 p = xrealloc(p, (sz + 3) * sizeof(struct line));
315 }
316 p[++j].value = h;
317 }
318 len[i] = j;
319 file[i] = p;
320}
321
322
323static void prune(void)
324{
325 int i, j;
326
327 for (pref = 0; pref < len[0] && pref < len[1] &&
328 file[0][pref + 1].value == file[1][pref + 1].value; pref++)
329 ;
330 for (suff = 0; suff < len[0] - pref && suff < len[1] - pref &&
331 file[0][len[0] - suff].value == file[1][len[1] - suff].value;
332 suff++)
333 ;
334 for (j = 0; j < 2; j++) {
335 sfile[j] = file[j] + pref;
336 slen[j] = len[j] - pref - suff;
337 for (i = 0; i <= slen[j]; i++)
338 sfile[j][i].serial = i;
339 }
340}
341
342
343static void equiv(struct line *a, int n, struct line *b, int m, int *c)
344{
345 int i, j;
346
347 i = j = 1;
348 while (i <= n && j <= m) {
349 if (a[i].value < b[j].value)
350 a[i++].value = 0;
351 else if (a[i].value == b[j].value)
352 a[i++].value = j;
353 else
354 j++;
355 }
356 while (i <= n)
357 a[i++].value = 0;
358 b[m + 1].value = 0;
359 j = 0;
360 while (++j <= m) {
361 c[j] = -b[j].serial;
362 while (b[j + 1].value == b[j].value) {
363 j++;
364 c[j] = b[j].serial;
365 }
366 }
367 c[j] = -1;
368}
369
370
371static int isqrt(int n)
372{
373 int y, x;
374
375 if (n == 0)
376 return 0;
377 x = 1;
378 do {
379 y = x;
380 x = n / x;
381 x += y;
382 x /= 2;
383 } while ((x - y) > 1 || (x - y) < -1);
384
385 return x;
386}
387
388
389static int newcand(int x, int y, int pred)
390{
391 struct cand *q;
392
393 if (clen == clistlen) {
394 clistlen = clistlen * 11 / 10;
395 clist = xrealloc(clist, clistlen * sizeof(struct cand));
396 }
397 q = clist + clen;
398 q->x = x;
399 q->y = y;
400 q->pred = pred;
401 return clen++;
402}
403
404
405static int search(int *c, int k, int y)
406{
407 int i, j, l, t;
408
409 if (clist[c[k]].y < y) /* quick look for typical case */
410 return k + 1;
411 i = 0;
412 j = k + 1;
413 while (1) {
414 l = i + j;
415 if ((l >>= 1) <= i)
416 break;
417 t = clist[c[l]].y;
418 if (t > y)
419 j = l;
420 else if (t < y)
421 i = l;
422 else
423 return l;
424 }
425 return l + 1;
426}
427
428
429static int stone(int *a, int n, int *b, int *c)
430{
431 int i, k, y, j, l;
432 int oldc, tc, oldl;
433 unsigned int numtries;
434
435#if ENABLE_FEATURE_DIFF_MINIMAL
436 const unsigned int bound =
437 (option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
438#else
439 const unsigned int bound = MAX(256, isqrt(n));
440#endif
441 k = 0;
442 c[0] = newcand(0, 0, 0);
443 for (i = 1; i <= n; i++) {
444 j = a[i];
445 if (j == 0)
446 continue;
447 y = -b[j];
448 oldl = 0;
449 oldc = c[0];
450 numtries = 0;
451 do {
452 if (y <= clist[oldc].y)
453 continue;
454 l = search(c, k, y);
455 if (l != oldl + 1)
456 oldc = c[l - 1];
457 if (l <= k) {
458 if (clist[c[l]].y <= y)
459 continue;
460 tc = c[l];
461 c[l] = newcand(i, y, oldc);
462 oldc = tc;
463 oldl = l;
464 numtries++;
465 } else {
466 c[l] = newcand(i, y, oldc);
467 k++;
468 break;
469 }
470 } while ((y = b[++j]) > 0 && numtries < bound);
471 }
472 return k;
473}
474
475
476static void unravel(int p)
477{
478 struct cand *q;
479 int i;
480
481 for (i = 0; i <= len[0]; i++)
482 J[i] = i <= pref ? i : i > len[0] - suff ? i + len[1] - len[0] : 0;
483 for (q = clist + p; q->y != 0; q = clist + q->pred)
484 J[q->x + pref] = q->y + pref;
485}
486
487
488static void unsort(struct line *f, int l, int *b)
489{
490 int *a, i;
491
492 a = xmalloc((l + 1) * sizeof(int));
493 for (i = 1; i <= l; i++)
494 a[f[i].serial] = f[i].value;
495 for (i = 1; i <= l; i++)
496 b[i] = a[i];
497 free(a);
498}
499
500
501static int skipline(FILE * f)
502{
503 int i, c;
504
505 for (i = 1; (c = getc(f)) != '\n' && c != EOF; i++)
506 continue;
507 return i;
508}
509
510
511/*
512 * Check does double duty:
513 * 1. ferret out any fortuitous correspondences due
514 * to confounding by hashing (which result in "jackpot")
515 * 2. collect random access indexes to the two files
516 */
517static void check(FILE * f1, FILE * f2)
518{
519 int i, j, jackpot, c, d;
520 long ctold, ctnew;
521
522 rewind(f1);
523 rewind(f2);
524 j = 1;
525 ixold[0] = ixnew[0] = 0;
526 jackpot = 0;
527 ctold = ctnew = 0;
528 for (i = 1; i <= len[0]; i++) {
529 if (J[i] == 0) {
530 ixold[i] = ctold += skipline(f1);
531 continue;
532 }
533 while (j < J[i]) {
534 ixnew[j] = ctnew += skipline(f2);
535 j++;
536 }
537 if ((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)
538 || (option_mask32 & FLAG_i)) {
539 while (1) {
540 c = getc(f1);
541 d = getc(f2);
542 /*
543 * GNU diff ignores a missing newline
544 * in one file if bflag || wflag.
545 */
546 if (((option_mask32 & FLAG_b) || (option_mask32 & FLAG_w)) &&
547 ((c == EOF && d == '\n') || (c == '\n' && d == EOF))) {
548 break;
549 }
550 ctold++;
551 ctnew++;
552 if ((option_mask32 & FLAG_b) && isspace(c) && isspace(d)) {
553 do {
554 if (c == '\n')
555 break;
556 ctold++;
557 } while (isspace(c = getc(f1)));
558 do {
559 if (d == '\n')
560 break;
561 ctnew++;
562 } while (isspace(d = getc(f2)));
563 } else if (option_mask32 & FLAG_w) {
564 while (isspace(c) && c != '\n') {
565 c = getc(f1);
566 ctold++;
567 }
568 while (isspace(d) && d != '\n') {
569 d = getc(f2);
570 ctnew++;
571 }
572 }
573 if (c != d) {
574 jackpot++;
575 J[i] = 0;
576 if (c != '\n' && c != EOF)
577 ctold += skipline(f1);
578 if (d != '\n' && c != EOF)
579 ctnew += skipline(f2);
580 break;
581 }
582 if (c == '\n' || c == EOF)
583 break;
584 }
585 } else {
586 while (1) {
587 ctold++;
588 ctnew++;
589 if ((c = getc(f1)) != (d = getc(f2))) {
590 J[i] = 0;
591 if (c != '\n' && c != EOF)
592 ctold += skipline(f1);
593 if (d != '\n' && c != EOF)
594 ctnew += skipline(f2);
595 break;
596 }
597 if (c == '\n' || c == EOF)
598 break;
599 }
600 }
601 ixold[i] = ctold;
602 ixnew[j] = ctnew;
603 j++;
604 }
605 for (; j <= len[1]; j++)
606 ixnew[j] = ctnew += skipline(f2);
607}
608
609
610/* shellsort CACM #201 */
611static void sort(struct line *a, int n)
612{
613 struct line *ai, *aim, w;
614 int j, m = 0, k;
615
616 if (n == 0)
617 return;
618 for (j = 1; j <= n; j *= 2)
619 m = 2 * j - 1;
620 for (m /= 2; m != 0; m /= 2) {
621 k = n - m;
622 for (j = 1; j <= k; j++) {
623 for (ai = &a[j]; ai > a; ai -= m) {
624 aim = &ai[m];
625 if (aim < ai)
626 break; /* wraparound */
627 if (aim->value > ai[0].value ||
628 (aim->value == ai[0].value && aim->serial > ai[0].serial))
629 break;
630 w.value = ai[0].value;
631 ai[0].value = aim->value;
632 aim->value = w.value;
633 w.serial = ai[0].serial;
634 ai[0].serial = aim->serial;
635 aim->serial = w.serial;
636 }
637 }
638 }
639}
640
641
642static void uni_range(int a, int b)
643{
644 if (a < b)
645 printf("%d,%d", a, b - a + 1);
646 else if (a == b)
647 printf("%d", b);
648 else
649 printf("%d,0", b);
650}
651
652
653static void fetch(long *f, int a, int b, FILE * lb, int ch)
654{
655 int i, j, c, lastc, col, nc;
656
657 if (a > b)
658 return;
659 for (i = a; i <= b; i++) {
660 fseek(lb, f[i - 1], SEEK_SET);
661 nc = f[i] - f[i - 1];
662 if (ch != '\0') {
663 putchar(ch);
664 if (option_mask32 & FLAG_T)
665 putchar('\t');
666 }
667 col = 0;
668 for (j = 0, lastc = '\0'; j < nc; j++, lastc = c) {
669 if ((c = getc(lb)) == EOF) {
670 printf("\n\\ No newline at end of file\n");
671 return;
672 }
673 if (c == '\t' && (option_mask32 & FLAG_t)) {
674 do {
675 putchar(' ');
676 } while (++col & 7);
677 } else {
678 putchar(c);
679 col++;
680 }
681 }
682 }
683}
684
685
686static int asciifile(FILE * f)
687{
688#if ENABLE_FEATURE_DIFF_BINARY
689 int i, cnt;
690#endif
691
692 if ((option_mask32 & FLAG_a) || f == NULL)
693 return 1;
694
695#if ENABLE_FEATURE_DIFF_BINARY
696 rewind(f);
697 cnt = fread(bb_common_bufsiz1, 1, BUFSIZ, f);
698 for (i = 0; i < cnt; i++) {
699 if (!isprint(bb_common_bufsiz1[i])
700 && !isspace(bb_common_bufsiz1[i])) {
701 return 0;
702 }
703 }
704#endif
705 return 1;
706}
707
708
709/* dump accumulated "unified" diff changes */
710static void dump_unified_vec(FILE * f1, FILE * f2)
711{
712 struct context_vec *cvp = context_vec_start;
713 int lowa, upb, lowc, upd;
714 int a, b, c, d;
715 char ch;
716
717 if (context_vec_start > context_vec_ptr)
718 return;
719
720 b = d = 0; /* gcc */
721 lowa = MAX(1, cvp->a - context);
722 upb = MIN(len[0], context_vec_ptr->b + context);
723 lowc = MAX(1, cvp->c - context);
724 upd = MIN(len[1], context_vec_ptr->d + context);
725
726 printf("@@ -");
727 uni_range(lowa, upb);
728 printf(" +");
729 uni_range(lowc, upd);
730 printf(" @@\n");
731
732 /*
733 * Output changes in "unified" diff format--the old and new lines
734 * are printed together.
735 */
736 for (; cvp <= context_vec_ptr; cvp++) {
737 a = cvp->a;
738 b = cvp->b;
739 c = cvp->c;
740 d = cvp->d;
741
742 /*
743 * c: both new and old changes
744 * d: only changes in the old file
745 * a: only changes in the new file
746 */
747 if (a <= b && c <= d)
748 ch = 'c';
749 else
750 ch = (a <= b) ? 'd' : 'a';
751#if 0
752 switch (ch) {
753 case 'c':
754 fetch(ixold, lowa, a - 1, f1, ' ');
755 fetch(ixold, a, b, f1, '-');
756 fetch(ixnew, c, d, f2, '+');
757 break;
758 case 'd':
759 fetch(ixold, lowa, a - 1, f1, ' ');
760 fetch(ixold, a, b, f1, '-');
761 break;
762 case 'a':
763 fetch(ixnew, lowc, c - 1, f2, ' ');
764 fetch(ixnew, c, d, f2, '+');
765 break;
766 }
767#else
768 if (ch == 'c' || ch == 'd') {
769 fetch(ixold, lowa, a - 1, f1, ' ');
770 fetch(ixold, a, b, f1, '-');
771 }
772 if (ch == 'a')
773 fetch(ixnew, lowc, c - 1, f2, ' ');
774 if (ch == 'c' || ch == 'a')
775 fetch(ixnew, c, d, f2, '+');
776#endif
777 lowa = b + 1;
778 lowc = d + 1;
779 }
780 fetch(ixnew, d + 1, upd, f2, ' ');
781
782 context_vec_ptr = context_vec_start - 1;
783}
784
785
786static void print_header(const char *file1, const char *file2)
787{
788 if (label1)
789 printf("--- %s\n", label1);
790 else
791 printf("--- %s\t%s", file1, ctime(&stb1.st_mtime));
792 if (label2)
793 printf("+++ %s\n", label2);
794 else
795 printf("+++ %s\t%s", file2, ctime(&stb2.st_mtime));
796}
797
798
799/*
800 * Indicate that there is a difference between lines a and b of the from file
801 * to get to lines c to d of the to file. If a is greater than b then there
802 * are no lines in the from file involved and this means that there were
803 * lines appended (beginning at b). If c is greater than d then there are
804 * lines missing from the to file.
805 */
806static void change(char *file1, FILE * f1, char *file2, FILE * f2, int a,
807 int b, int c, int d)
808{
809 if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
810 anychange = 1;
811 return;
812 }
813
814 /*
815 * Allocate change records as needed.
816 */
817 if (context_vec_ptr == context_vec_end - 1) {
818 ptrdiff_t offset = context_vec_ptr - context_vec_start;
819
820 max_context <<= 1;
821 context_vec_start = xrealloc(context_vec_start,
822 max_context * sizeof(struct context_vec));
823 context_vec_end = context_vec_start + max_context;
824 context_vec_ptr = context_vec_start + offset;
825 }
826 if (anychange == 0) {
827 /*
828 * Print the context/unidiff header first time through.
829 */
830 print_header(file1, file2);
831 } else if (a > context_vec_ptr->b + (2 * context) + 1 &&
832 c > context_vec_ptr->d + (2 * context) + 1) {
833 /*
834 * If this change is more than 'context' lines from the
835 * previous change, dump the record and reset it.
836 */
837 dump_unified_vec(f1, f2);
838 }
839 context_vec_ptr++;
840 context_vec_ptr->a = a;
841 context_vec_ptr->b = b;
842 context_vec_ptr->c = c;
843 context_vec_ptr->d = d;
844 anychange = 1;
845}
846
847
848static void output(char *file1, FILE * f1, char *file2, FILE * f2)
849{
850 /* Note that j0 and j1 can't be used as they are defined in math.h.
851 * This also allows the rather amusing variable 'j00'... */
852 int m, i0, i1, j00, j01;
853
854 rewind(f1);
855 rewind(f2);
856 m = len[0];
857 J[0] = 0;
858 J[m + 1] = len[1] + 1;
859 for (i0 = 1; i0 <= m; i0 = i1 + 1) {
860 while (i0 <= m && J[i0] == J[i0 - 1] + 1)
861 i0++;
862 j00 = J[i0 - 1] + 1;
863 i1 = i0 - 1;
864 while (i1 < m && J[i1 + 1] == 0)
865 i1++;
866 j01 = J[i1 + 1] - 1;
867 J[i1] = j01;
868 change(file1, f1, file2, f2, i0, i1, j00, j01);
869 }
870 if (m == 0) {
871 change(file1, f1, file2, f2, 1, 0, 1, len[1]);
872 }
873 if (anychange != 0 && !(option_mask32 & FLAG_q)) {
874 dump_unified_vec(f1, f2);
875 }
876}
877
878/*
879 * The following code uses an algorithm due to Harold Stone,
880 * which finds a pair of longest identical subsequences in
881 * the two files.
882 *
883 * The major goal is to generate the match vector J.
884 * J[i] is the index of the line in file1 corresponding
885 * to line i file0. J[i] = 0 if there is no
886 * such line in file1.
887 *
888 * Lines are hashed so as to work in core. All potential
889 * matches are located by sorting the lines of each file
890 * on the hash (called ``value''). In particular, this
891 * collects the equivalence classes in file1 together.
892 * Subroutine equiv replaces the value of each line in
893 * file0 by the index of the first element of its
894 * matching equivalence in (the reordered) file1.
895 * To save space equiv squeezes file1 into a single
896 * array member in which the equivalence classes
897 * are simply concatenated, except that their first
898 * members are flagged by changing sign.
899 *
900 * Next the indices that point into member are unsorted into
901 * array class according to the original order of file0.
902 *
903 * The cleverness lies in routine stone. This marches
904 * through the lines of file0, developing a vector klist
905 * of "k-candidates". At step i a k-candidate is a matched
906 * pair of lines x,y (x in file0 y in file1) such that
907 * there is a common subsequence of length k
908 * between the first i lines of file0 and the first y
909 * lines of file1, but there is no such subsequence for
910 * any smaller y. x is the earliest possible mate to y
911 * that occurs in such a subsequence.
912 *
913 * Whenever any of the members of the equivalence class of
914 * lines in file1 matable to a line in file0 has serial number
915 * less than the y of some k-candidate, that k-candidate
916 * with the smallest such y is replaced. The new
917 * k-candidate is chained (via pred) to the current
918 * k-1 candidate so that the actual subsequence can
919 * be recovered. When a member has serial number greater
920 * that the y of all k-candidates, the klist is extended.
921 * At the end, the longest subsequence is pulled out
922 * and placed in the array J by unravel
923 *
924 * With J in hand, the matches there recorded are
925 * checked against reality to assure that no spurious
926 * matches have crept in due to hashing. If they have,
927 * they are broken, and "jackpot" is recorded--a harmless
928 * matter except that a true match for a spuriously
929 * mated line may now be unnecessarily reported as a change.
930 *
931 * Much of the complexity of the program comes simply
932 * from trying to minimize core utilization and
933 * maximize the range of doable problems by dynamically
934 * allocating what is needed and reusing what is not.
935 * The core requirements for problems larger than somewhat
936 * are (in words) 2*length(file0) + length(file1) +
937 * 3*(number of k-candidates installed), typically about
938 * 6n words for files of length n.
939 */
940static unsigned diffreg(char * ofile1, char * ofile2, int flags)
941{
942 char *file1 = ofile1;
943 char *file2 = ofile2;
944 FILE *f1 = stdin, *f2 = stdin;
945 unsigned rval;
946 int i;
947
948 anychange = 0;
949 context_vec_ptr = context_vec_start - 1;
950
951 if (S_ISDIR(stb1.st_mode) != S_ISDIR(stb2.st_mode))
952 return (S_ISDIR(stb1.st_mode) ? D_MISMATCH1 : D_MISMATCH2);
953
954 rval = D_SAME;
955
956 if (LONE_DASH(file1) && LONE_DASH(file2))
957 goto closem;
958
959 if (flags & D_EMPTY1)
960 f1 = xfopen(bb_dev_null, "r");
961 else if (NOT_LONE_DASH(file1))
962 f1 = xfopen(file1, "r");
963 if (flags & D_EMPTY2)
964 f2 = xfopen(bb_dev_null, "r");
965 else if (NOT_LONE_DASH(file2))
966 f2 = xfopen(file2, "r");
967
968/* We can't diff non-seekable stream - we use rewind(), fseek().
969 * This can be fixed (volunteers?).
970 * Meanwhile we should check it here by stat'ing input fds,
971 * but I am lazy and check that in main() instead.
972 * Check in main won't catch "diffing fifos buried in subdirectories"
973 * failure scenario - not very likely in real life... */
974
975 i = files_differ(f1, f2, flags);
976 if (i == 0)
977 goto closem;
978 else if (i != 1) { /* 1 == ok */
979 /* error */
980 status |= 2;
981 goto closem;
982 }
983
984 if (!asciifile(f1) || !asciifile(f2)) {
985 rval = D_BINARY;
986 status |= 1;
987 goto closem;
988 }
989
990 prepare(0, f1, stb1.st_size);
991 prepare(1, f2, stb2.st_size);
992 prune();
993 sort(sfile[0], slen[0]);
994 sort(sfile[1], slen[1]);
995
996 member = (int *) file[1];
997 equiv(sfile[0], slen[0], sfile[1], slen[1], member);
998 member = xrealloc(member, (slen[1] + 2) * sizeof(int));
999
1000 class = (int *) file[0];
1001 unsort(sfile[0], slen[0], class);
1002 class = xrealloc(class, (slen[0] + 2) * sizeof(int));
1003
1004 klist = xmalloc((slen[0] + 2) * sizeof(int));
1005 clen = 0;
1006 clistlen = 100;
1007 clist = xmalloc(clistlen * sizeof(struct cand));
1008 i = stone(class, slen[0], member, klist);
1009 free(member);
1010 free(class);
1011
1012 J = xrealloc(J, (len[0] + 2) * sizeof(int));
1013 unravel(klist[i]);
1014 free(clist);
1015 free(klist);
1016
1017 ixold = xrealloc(ixold, (len[0] + 2) * sizeof(long));
1018 ixnew = xrealloc(ixnew, (len[1] + 2) * sizeof(long));
1019 check(f1, f2);
1020 output(file1, f1, file2, f2);
1021
1022 closem:
1023 if (anychange) {
1024 status |= 1;
1025 if (rval == D_SAME)
1026 rval = D_DIFFER;
1027 }
1028 fclose_if_not_stdin(f1);
1029 fclose_if_not_stdin(f2);
1030 if (file1 != ofile1)
1031 free(file1);
1032 if (file2 != ofile2)
1033 free(file2);
1034 return rval;
1035}
1036
1037
1038#if ENABLE_FEATURE_DIFF_DIR
1039static void do_diff(char *dir1, char *path1, char *dir2, char *path2)
1040{
1041 int flags = D_HEADER;
1042 int val;
1043 char *fullpath1 = NULL; /* if -N */
1044 char *fullpath2 = NULL;
1045
1046 if (path1)
1047 fullpath1 = concat_path_file(dir1, path1);
1048 if (path2)
1049 fullpath2 = concat_path_file(dir2, path2);
1050
1051 if (!fullpath1 || stat(fullpath1, &stb1) != 0) {
1052 flags |= D_EMPTY1;
1053 memset(&stb1, 0, sizeof(stb1));
1054 if (path2) {
1055 free(fullpath1);
1056 fullpath1 = concat_path_file(dir1, path2);
1057 }
1058 }
1059 if (!fullpath2 || stat(fullpath2, &stb2) != 0) {
1060 flags |= D_EMPTY2;
1061 memset(&stb2, 0, sizeof(stb2));
1062 stb2.st_mode = stb1.st_mode;
1063 if (path1) {
1064 free(fullpath2);
1065 fullpath2 = concat_path_file(dir2, path1);
1066 }
1067 }
1068
1069 if (stb1.st_mode == 0)
1070 stb1.st_mode = stb2.st_mode;
1071
1072 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
1073 printf("Common subdirectories: %s and %s\n", fullpath1, fullpath2);
1074 goto ret;
1075 }
1076
1077 if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode))
1078 val = D_SKIPPED1;
1079 else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
1080 val = D_SKIPPED2;
1081 else
1082 val = diffreg(fullpath1, fullpath2, flags);
1083
1084 print_status(val, fullpath1, fullpath2, NULL);
1085 ret:
1086 free(fullpath1);
1087 free(fullpath2);
1088}
1089#endif
1090
1091
1092#if ENABLE_FEATURE_DIFF_DIR
1093static int dir_strcmp(const void *p1, const void *p2)
1094{
1095 return strcmp(*(char *const *) p1, *(char *const *) p2);
1096}
1097
1098
1099/* This function adds a filename to dl, the directory listing. */
1100static int add_to_dirlist(const char *filename,
1101 struct stat ATTRIBUTE_UNUSED * sb, void *userdata,
1102 int depth ATTRIBUTE_UNUSED)
1103{
1104 /* +2: with space for eventual trailing NULL */
1105 dl = xrealloc(dl, (dl_count+2) * sizeof(dl[0]));
1106 dl[dl_count] = xstrdup(filename + (int)(ptrdiff_t)userdata);
1107 dl_count++;
1108 return TRUE;
1109}
1110
1111
1112/* This returns a sorted directory listing. */
1113static char **get_dir(char *path)
1114{
1115 dl_count = 0;
1116 dl = xzalloc(sizeof(dl[0]));
1117
1118 /* If -r has been set, then the recursive_action function will be
1119 * used. Unfortunately, this outputs the root directory along with
1120 * the recursed paths, so use void *userdata to specify the string
1121 * length of the root directory - '(void*)(strlen(path)+)'.
1122 * add_to_dirlist then removes root dir prefix. */
1123
1124 if (option_mask32 & FLAG_r) {
1125 recursive_action(path, ACTION_RECURSE|ACTION_FOLLOWLINKS,
1126 add_to_dirlist, NULL,
1127 (void*)(strlen(path)+1), 0);
1128 } else {
1129 DIR *dp;
1130 struct dirent *ep;
1131
1132 dp = warn_opendir(path);
1133 while ((ep = readdir(dp))) {
1134 if (!strcmp(ep->d_name, "..") || LONE_CHAR(ep->d_name, '.'))
1135 continue;
1136 add_to_dirlist(ep->d_name, NULL, (void*)(int)0, 0);
1137 }
1138 closedir(dp);
1139 }
1140
1141 /* Sort dl alphabetically. */
1142 qsort(dl, dl_count, sizeof(char *), dir_strcmp);
1143
1144 dl[dl_count] = NULL;
1145 return dl;
1146}
1147
1148
1149static void diffdir(char *p1, char *p2)
1150{
1151 char **dirlist1, **dirlist2;
1152 char *dp1, *dp2;
1153 int pos;
1154
1155 /* Check for trailing slashes. */
1156 dp1 = last_char_is(p1, '/');
1157 if (dp1 != NULL)
1158 *dp1 = '\0';
1159 dp2 = last_char_is(p2, '/');
1160 if (dp2 != NULL)
1161 *dp2 = '\0';
1162
1163 /* Get directory listings for p1 and p2. */
1164
1165 dirlist1 = get_dir(p1);
1166 dirlist2 = get_dir(p2);
1167
1168 /* If -S was set, find the starting point. */
1169 if (start) {
1170 while (*dirlist1 != NULL && strcmp(*dirlist1, start) < 0)
1171 dirlist1++;
1172 while (*dirlist2 != NULL && strcmp(*dirlist2, start) < 0)
1173 dirlist2++;
1174 if ((*dirlist1 == NULL) || (*dirlist2 == NULL))
1175 bb_error_msg(bb_msg_invalid_arg, "NULL", "-S");
1176 }
1177
1178 /* Now that both dirlist1 and dirlist2 contain sorted directory
1179 * listings, we can start to go through dirlist1. If both listings
1180 * contain the same file, then do a normal diff. Otherwise, behaviour
1181 * is determined by whether the -N flag is set. */
1182 while (*dirlist1 != NULL || *dirlist2 != NULL) {
1183 dp1 = *dirlist1;
1184 dp2 = *dirlist2;
1185 pos = dp1 == NULL ? 1 : dp2 == NULL ? -1 : strcmp(dp1, dp2);
1186 if (pos == 0) {
1187 do_diff(p1, dp1, p2, dp2);
1188 dirlist1++;
1189 dirlist2++;
1190 } else if (pos < 0) {
1191 if (option_mask32 & FLAG_N)
1192 do_diff(p1, dp1, p2, NULL);
1193 else
1194 print_only(p1, strlen(p1) + 1, dp1);
1195 dirlist1++;
1196 } else {
1197 if (option_mask32 & FLAG_N)
1198 do_diff(p1, NULL, p2, dp2);
1199 else
1200 print_only(p2, strlen(p2) + 1, dp2);
1201 dirlist2++;
1202 }
1203 }
1204}
1205#endif
1206
1207
1208int diff_main(int argc, char **argv);
1209int diff_main(int argc, char **argv)
1210{
1211 bool gotstdin = 0;
1212 char *U_opt;
1213 char *f1, *f2;
1214 llist_t *L_arg = NULL;
1215
1216 INIT_G();
1217
1218 /* exactly 2 params; collect multiple -L <label> */
1219 opt_complementary = "=2:L::";
1220 getopt32(argc, argv, "abdiL:NqrsS:tTU:wu"
1221 "p" /* ignored (for compatibility) */,
1222 &L_arg, &start, &U_opt);
1223 /*argc -= optind;*/
1224 argv += optind;
1225 while (L_arg) {
1226 if (label1 && label2)
1227 bb_show_usage();
1228 if (!label1)
1229 label1 = L_arg->data;
1230 else { /* then label2 is NULL */
1231 label2 = label1;
1232 label1 = L_arg->data;
1233 }
1234 /* we leak L_arg here... */
1235 L_arg = L_arg->link;
1236 }
1237 if (option_mask32 & FLAG_U)
1238 context = xatoi_u(U_opt);
1239
1240 /*
1241 * Do sanity checks, fill in stb1 and stb2 and call the appropriate
1242 * driver routine. Both drivers use the contents of stb1 and stb2.
1243 */
1244
1245 f1 = argv[0];
1246 f2 = argv[1];
1247 if (LONE_DASH(f1)) {
1248 fstat(STDIN_FILENO, &stb1);
1249 gotstdin = 1;
1250 } else
1251 xstat(f1, &stb1);
1252 if (LONE_DASH(f2)) {
1253 fstat(STDIN_FILENO, &stb2);
1254 gotstdin = 1;
1255 } else
1256 xstat(f2, &stb2);
1257 if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
1258 bb_error_msg_and_die("can't compare - to a directory");
1259 if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
1260#if ENABLE_FEATURE_DIFF_DIR
1261 diffdir(f1, f2);
1262#else
1263 bb_error_msg_and_die("directory comparison not supported");
1264#endif
1265 } else {
1266 if (S_ISDIR(stb1.st_mode)) {
1267 f1 = concat_path_file(f1, f2);
1268 xstat(f1, &stb1);
1269 }
1270 if (S_ISDIR(stb2.st_mode)) {
1271 f2 = concat_path_file(f2, f1);
1272 xstat(f2, &stb2);
1273 }
1274/* XXX: FIXME: */
1275/* We can't diff e.g. stdin supplied by a pipe - we use rewind(), fseek().
1276 * This can be fixed (volunteers?) */
1277 if (!S_ISREG(stb1.st_mode) || !S_ISREG(stb2.st_mode))
1278 bb_error_msg_and_die("can't diff non-seekable stream");
1279 print_status(diffreg(f1, f2, 0), f1, f2, NULL);
1280 }
1281 return status;
1282}