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diff: implement flag -B (Ignore changes whose lines are all blank)

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>>From 7c3ce93213590bd0592435dc27d1272d0fd3309b Mon Sep 17 00:00:00 2001
From: Matheus Izvekov <mizvekov@gmail.com>
Date: Mon, 18 Jan 2010 15:52:31 -0200
Subject: [PATCH] diff: implement flag -B (Ignore changes whose lines are all blank)

function                                             old     new   delta
diffreg                                             1196    1240     +44
.rodata                                             6538    6561     +23
packed_usage                                         457     478     +21
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(add/remove: 0/0 grow/shrink: 3/0 up/down: 88/0)               Total: 88 bytes
   text	   data	    bss	    dec	    hex	filename
  70123	    733	   8576	  79432	  13648	busybox_old
  70190	    733	   8576	  79499	  1368b	busybox_unstripped

Signed-off-by: Matheus Izvekov <mizvekov@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Matheus Izvekov 2010-01-18 16:07:07 -02:00 committed by Denys Vlasenko
parent b7a044043c
commit fe1ce2e43e
2 changed files with 19 additions and 12 deletions
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28
editors/diff.c
View File

@ -84,27 +84,31 @@
#define dbg_error_msg(...) ((void)0)
#endif
enum { /* print_status() and diffreg() return values */
STATUS_SAME, /* files are the same */
STATUS_DIFFER, /* files differ */
STATUS_BINARY, /* binary files differ */
enum { /* print_status() and diffreg() return values */
STATUS_SAME, /* files are the same */
STATUS_DIFFER, /* files differ */
STATUS_BINARY, /* binary files differ */
};
enum { /* Commandline flags */
enum { /* Commandline flags */
FLAG_a,
FLAG_b,
FLAG_d,
FLAG_i,
FLAG_L, /* unused */
FLAG_L, /* never used, handled by getopt32 */
FLAG_N,
FLAG_q,
FLAG_r,
FLAG_s,
FLAG_S, /* unused */
FLAG_S, /* never used, handled by getopt32 */
FLAG_t,
FLAG_T,
FLAG_U, /* unused */
FLAG_U, /* never used, handled by getopt32 */
FLAG_w,
FLAG_u, /* ignored, this is the default */
FLAG_p, /* not implemented */
FLAG_B,
FLAG_E, /* not implemented */
};
#define FLAG(x) (1 << FLAG_##x)
@ -578,6 +582,8 @@ static bool diff(FILE_and_pos_t ft[2], char *file[2])
int idx = -1, i = 1;
do {
bool nonempty = false;
while (1) {
struct context_vec v;
@ -606,6 +612,7 @@ static bool diff(FILE_and_pos_t ft[2], char *file[2])
) {
break;
}
nonempty |= (v.a >= v.b) && (v.c >= v.d);
vec = xrealloc_vector(vec, 6, ++idx);
vec[idx] = v;
}
@ -617,7 +624,7 @@ static bool diff(FILE_and_pos_t ft[2], char *file[2])
}
if (idx < 0)
continue;
if (!(option_mask32 & FLAG(q))) {
if (!(option_mask32 & FLAG(q)) && !((option_mask32 & FLAG(B)) && !nonempty)) {
struct context_vec *cvp = vec;
int lowa = MAX(1, cvp->a - opt_U_context);
int upb = MIN(nlen[0], vec[idx].b + opt_U_context);
@ -880,8 +887,7 @@ int diff_main(int argc UNUSED_PARAM, char **argv)
/* exactly 2 params; collect multiple -L <label>; -U N */
opt_complementary = "=2:L::U+";
getopt32(argv, "abdiL:NqrsS:tTU:wu"
"p" /* ignored (for compatibility) */,
getopt32(argv, "abdiL:NqrsS:tTU:wupBE",
&L_arg, &s_start, &opt_U_context);
argv += optind;
while (L_arg) {

3
include/usage.h
View File

@ -852,13 +852,14 @@
"Relay DHCP requests between clients and server" \
#define diff_trivial_usage \
"[-abdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2"
"[-abBdiNqrTstw] [-L LABEL] [-S FILE] [-U LINES] FILE1 FILE2"
#define diff_full_usage "\n\n" \
"Compare files line by line and output the differences between them.\n" \
"This implementation supports unified diffs only.\n" \
"\nOptions:" \
"\n -a Treat all files as text" \
"\n -b Ignore changes in the amount of whitespace" \
"\n -B Ignore changes whose lines are all blank" \
"\n -d Try hard to find a smaller set of changes" \
"\n -i Ignore case differences" \
"\n -L Use LABEL instead of the filename in the unified header" \