1 files changed, 270 insertions, 396 deletions

diff --git a/diff.c b/diff.c
index 71b340c..b08d28a 100644
--- a/diff.c
+++ b/diff.c
@@ -9,6 +9,7 @@
 #include "xdiff-interface.h"
 #include "color.h"
 #include "attr.h"
+#include "run-command.h"
 
 #ifdef NO_FAST_WORKING_DIRECTORY
 #define FAST_WORKING_DIRECTORY 0
@@ -83,13 +84,8 @@ static int parse_lldiff_command(const char *var, const char *ep, const char *val
 		if (!strncmp(drv->name, name, namelen) && !drv->name[namelen])
 			break;
 	if (!drv) {
-		char *namebuf;
 		drv = xcalloc(1, sizeof(struct ll_diff_driver));
-		namebuf = xmalloc(namelen + 1);
-		memcpy(namebuf, name, namelen);
-		namebuf[namelen] = 0;
-		drv->name = namebuf;
-		drv->next = NULL;
+		drv->name = xmemdupz(name, namelen);
 		if (!user_diff_tail)
 			user_diff_tail = &user_diff;
 		*user_diff_tail = drv;
@@ -126,12 +122,8 @@ static int parse_funcname_pattern(const char *var, const char *ep, const char *v
 		if (!strncmp(pp->name, name, namelen) && !pp->name[namelen])
 			break;
 	if (!pp) {
-		char *namebuf;
 		pp = xcalloc(1, sizeof(*pp));
-		namebuf = xmalloc(namelen + 1);
-		memcpy(namebuf, name, namelen);
-		namebuf[namelen] = 0;
-		pp->name = namebuf;
+		pp->name = xmemdupz(name, namelen);
 		pp->next = funcname_pattern_list;
 		funcname_pattern_list = pp;
 	}
@@ -190,44 +182,23 @@ int git_diff_ui_config(const char *var, const char *value)
 	return git_default_config(var, value);
 }
 
-static char *quote_one(const char *str)
-{
-	int needlen;
-	char *xp;
-
-	if (!str)
-		return NULL;
-	needlen = quote_c_style(str, NULL, NULL, 0);
-	if (!needlen)
-		return xstrdup(str);
-	xp = xmalloc(needlen + 1);
-	quote_c_style(str, xp, NULL, 0);
-	return xp;
-}
-
 static char *quote_two(const char *one, const char *two)
 {
 	int need_one = quote_c_style(one, NULL, NULL, 1);
 	int need_two = quote_c_style(two, NULL, NULL, 1);
-	char *xp;
+	struct strbuf res;
 
+	strbuf_init(&res, 0);
 	if (need_one + need_two) {
-		if (!need_one) need_one = strlen(one);
-		if (!need_two) need_one = strlen(two);
-
-		xp = xmalloc(need_one + need_two + 3);
-		xp[0] = '"';
-		quote_c_style(one, xp + 1, NULL, 1);
-		quote_c_style(two, xp + need_one + 1, NULL, 1);
-		strcpy(xp + need_one + need_two + 1, "\"");
-		return xp;
+		strbuf_addch(&res, '"');
+		quote_c_style(one, &res, NULL, 1);
+		quote_c_style(two, &res, NULL, 1);
+		strbuf_addch(&res, '"');
+	} else {
+		strbuf_addstr(&res, one);
+		strbuf_addstr(&res, two);
 	}
-	need_one = strlen(one);
-	need_two = strlen(two);
-	xp = xmalloc(need_one + need_two + 1);
-	strcpy(xp, one);
-	strcpy(xp + need_one, two);
-	return xp;
+	return strbuf_detach(&res, NULL);
 }
 
 static const char *external_diff(void)
@@ -679,27 +650,20 @@ static char *pprint_rename(const char *a, const char *b)
 {
 	const char *old = a;
 	const char *new = b;
-	char *name = NULL;
+	struct strbuf name;
 	int pfx_length, sfx_length;
 	int len_a = strlen(a);
 	int len_b = strlen(b);
+	int a_midlen, b_midlen;
 	int qlen_a = quote_c_style(a, NULL, NULL, 0);
 	int qlen_b = quote_c_style(b, NULL, NULL, 0);
 
+	strbuf_init(&name, 0);
 	if (qlen_a || qlen_b) {
-		if (qlen_a) len_a = qlen_a;
-		if (qlen_b) len_b = qlen_b;
-		name = xmalloc( len_a + len_b + 5 );
-		if (qlen_a)
-			quote_c_style(a, name, NULL, 0);
-		else
-			memcpy(name, a, len_a);
-		memcpy(name + len_a, " => ", 4);
-		if (qlen_b)
-			quote_c_style(b, name + len_a + 4, NULL, 0);
-		else
-			memcpy(name + len_a + 4, b, len_b + 1);
-		return name;
+		quote_c_style(a, &name, NULL, 0);
+		strbuf_addstr(&name, " => ");
+		quote_c_style(b, &name, NULL, 0);
+		return strbuf_detach(&name, NULL);
 	}
 
 	/* Find common prefix */
@@ -728,24 +692,26 @@ static char *pprint_rename(const char *a, const char *b)
 	 * pfx{sfx-a => sfx-b}
 	 * name-a => name-b
 	 */
+	a_midlen = len_a - pfx_length - sfx_length;
+	b_midlen = len_b - pfx_length - sfx_length;
+	if (a_midlen < 0)
+		a_midlen = 0;
+	if (b_midlen < 0)
+		b_midlen = 0;
+
+	strbuf_grow(&name, pfx_length + a_midlen + b_midlen + sfx_length + 7);
 	if (pfx_length + sfx_length) {
-		int a_midlen = len_a - pfx_length - sfx_length;
-		int b_midlen = len_b - pfx_length - sfx_length;
-		if (a_midlen < 0) a_midlen = 0;
-		if (b_midlen < 0) b_midlen = 0;
-
-		name = xmalloc(pfx_length + a_midlen + b_midlen + sfx_length + 7);
-		sprintf(name, "%.*s{%.*s => %.*s}%s",
-			pfx_length, a,
-			a_midlen, a + pfx_length,
-			b_midlen, b + pfx_length,
-			a + len_a - sfx_length);
+		strbuf_add(&name, a, pfx_length);
+		strbuf_addch(&name, '{');
 	}
-	else {
-		name = xmalloc(len_a + len_b + 5);
-		sprintf(name, "%s => %s", a, b);
+	strbuf_add(&name, a + pfx_length, a_midlen);
+	strbuf_addstr(&name, " => ");
+	strbuf_add(&name, b + pfx_length, b_midlen);
+	if (pfx_length + sfx_length) {
+		strbuf_addch(&name, '}');
+		strbuf_add(&name, a + len_a - sfx_length, sfx_length);
 	}
-	return name;
+	return strbuf_detach(&name, NULL);
 }
 
 struct diffstat_t {
@@ -848,22 +814,23 @@ static void show_stats(struct diffstat_t* data, struct diff_options *options)
 	}
 
 	/* Find the longest filename and max number of changes */
-	reset = diff_get_color(options->color_diff, DIFF_RESET);
-	set = diff_get_color(options->color_diff, DIFF_PLAIN);
-	add_c = diff_get_color(options->color_diff, DIFF_FILE_NEW);
-	del_c = diff_get_color(options->color_diff, DIFF_FILE_OLD);
+	reset = diff_get_color_opt(options, DIFF_RESET);
+	set   = diff_get_color_opt(options, DIFF_PLAIN);
+	add_c = diff_get_color_opt(options, DIFF_FILE_NEW);
+	del_c = diff_get_color_opt(options, DIFF_FILE_OLD);
 
 	for (i = 0; i < data->nr; i++) {
 		struct diffstat_file *file = data->files[i];
 		int change = file->added + file->deleted;
 
 		if (!file->is_renamed) {  /* renames are already quoted by pprint_rename */
-			len = quote_c_style(file->name, NULL, NULL, 0);
-			if (len) {
-				char *qname = xmalloc(len + 1);
-				quote_c_style(file->name, qname, NULL, 0);
+			struct strbuf buf;
+			strbuf_init(&buf, 0);
+			if (quote_c_style(file->name, &buf, NULL, 0)) {
 				free(file->name);
-				file->name = qname;
+				file->name = strbuf_detach(&buf, NULL);
+			} else {
+				strbuf_release(&buf);
 			}
 		}
 
@@ -1001,12 +968,12 @@ static void show_numstat(struct diffstat_t* data, struct diff_options *options)
 			printf("-\t-\t");
 		else
 			printf("%d\t%d\t", file->added, file->deleted);
-		if (options->line_termination && !file->is_renamed &&
-		    quote_c_style(file->name, NULL, NULL, 0))
-			quote_c_style(file->name, NULL, stdout, 0);
-		else
+		if (!file->is_renamed) {
+			write_name_quoted(file->name, stdout, options->line_termination);
+		} else {
 			fputs(file->name, stdout);
-		putchar(options->line_termination);
+			putchar(options->line_termination);
+		}
 	}
 }
 
@@ -1276,8 +1243,8 @@ static void builtin_diff(const char *name_a,
 	mmfile_t mf1, mf2;
 	const char *lbl[2];
 	char *a_one, *b_two;
-	const char *set = diff_get_color(o->color_diff, DIFF_METAINFO);
-	const char *reset = diff_get_color(o->color_diff, DIFF_RESET);
+	const char *set = diff_get_color_opt(o, DIFF_METAINFO);
+	const char *reset = diff_get_color_opt(o, DIFF_RESET);
 
 	a_one = quote_two("a/", name_a + (*name_a == '/'));
 	b_two = quote_two("b/", name_b + (*name_b == '/'));
@@ -1310,7 +1277,7 @@ static void builtin_diff(const char *name_a,
 			goto free_ab_and_return;
 		if (complete_rewrite) {
 			emit_rewrite_diff(name_a, name_b, one, two,
-					o->color_diff);
+					DIFF_OPT_TST(o, COLOR_DIFF));
 			o->found_changes = 1;
 			goto free_ab_and_return;
 		}
@@ -1319,13 +1286,13 @@ static void builtin_diff(const char *name_a,
 	if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
 		die("unable to read files to diff");
 
-	if (!o->text &&
+	if (!DIFF_OPT_TST(o, TEXT) &&
 	    (diff_filespec_is_binary(one) || diff_filespec_is_binary(two))) {
 		/* Quite common confusing case */
 		if (mf1.size == mf2.size &&
 		    !memcmp(mf1.ptr, mf2.ptr, mf1.size))
 			goto free_ab_and_return;
-		if (o->binary)
+		if (DIFF_OPT_TST(o, BINARY))
 			emit_binary_diff(&mf1, &mf2);
 		else
 			printf("Binary files %s and %s differ\n",
@@ -1348,7 +1315,7 @@ static void builtin_diff(const char *name_a,
 		memset(&xecfg, 0, sizeof(xecfg));
 		memset(&ecbdata, 0, sizeof(ecbdata));
 		ecbdata.label_path = lbl;
-		ecbdata.color_diff = o->color_diff;
+		ecbdata.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
 		ecbdata.found_changesp = &o->found_changes;
 		xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
 		xecfg.ctxlen = o->context;
@@ -1364,11 +1331,11 @@ static void builtin_diff(const char *name_a,
 		ecb.outf = xdiff_outf;
 		ecb.priv = &ecbdata;
 		ecbdata.xm.consume = fn_out_consume;
-		if (o->color_diff_words)
+		if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
 			ecbdata.diff_words =
 				xcalloc(1, sizeof(struct diff_words_data));
 		xdl_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
-		if (o->color_diff_words)
+		if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
 			free_diff_words_data(&ecbdata);
 	}
 
@@ -1442,7 +1409,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
 	data.xm.consume = checkdiff_consume;
 	data.filename = name_b ? name_b : name_a;
 	data.lineno = 0;
-	data.color_diff = o->color_diff;
+	data.color_diff = DIFF_OPT_TST(o, COLOR_DIFF);
 
 	if (fill_mmfile(&mf1, one) < 0 || fill_mmfile(&mf2, two) < 0)
 		die("unable to read files to diff");
@@ -1474,9 +1441,18 @@ struct diff_filespec *alloc_filespec(const char *path)
 	memset(spec, 0, sizeof(*spec));
 	spec->path = (char *)(spec + 1);
 	memcpy(spec->path, path, namelen+1);
+	spec->count = 1;
 	return spec;
 }
 
+void free_filespec(struct diff_filespec *spec)
+{
+	if (!--spec->count) {
+		diff_free_filespec_data(spec);
+		free(spec);
+	}
+}
+
 void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
 		   unsigned short mode)
 {
@@ -1545,25 +1521,16 @@ static int reuse_worktree_file(const char *name, const unsigned char *sha1, int
 
 static int populate_from_stdin(struct diff_filespec *s)
 {
-#define INCREMENT 1024
-	char *buf;
-	unsigned long size;
-	ssize_t got;
-
-	size = 0;
-	buf = NULL;
-	while (1) {
-		buf = xrealloc(buf, size + INCREMENT);
-		got = xread(0, buf + size, INCREMENT);
-		if (!got)
-			break; /* EOF */
-		if (got < 0)
-			return error("error while reading from stdin %s",
+	struct strbuf buf;
+	size_t size = 0;
+
+	strbuf_init(&buf, 0);
+	if (strbuf_read(&buf, 0, 0) < 0)
+		return error("error while reading from stdin %s",
 				     strerror(errno));
-		size += got;
-	}
+
 	s->should_munmap = 0;
-	s->data = buf;
+	s->data = strbuf_detach(&buf, &size);
 	s->size = size;
 	s->should_free = 1;
 	return 0;
@@ -1609,10 +1576,9 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
 
 	if (!s->sha1_valid ||
 	    reuse_worktree_file(s->path, s->sha1, 0)) {
+		struct strbuf buf;
 		struct stat st;
 		int fd;
-		char *buf;
-		unsigned long size;
 
 		if (!strcmp(s->path, "-"))
 			return populate_from_stdin(s);
@@ -1653,12 +1619,12 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
 		/*
 		 * Convert from working tree format to canonical git format
 		 */
-		size = s->size;
-		buf = convert_to_git(s->path, s->data, &size);
-		if (buf) {
+		strbuf_init(&buf, 0);
+		if (convert_to_git(s->path, s->data, s->size, &buf)) {
+			size_t size = 0;
 			munmap(s->data, s->size);
 			s->should_munmap = 0;
-			s->data = buf;
+			s->data = strbuf_detach(&buf, &size);
 			s->size = size;
 			s->should_free = 1;
 		}
@@ -1796,40 +1762,6 @@ static void remove_tempfile_on_signal(int signo)
 	raise(signo);
 }
 
-static int spawn_prog(const char *pgm, const char **arg)
-{
-	pid_t pid;
-	int status;
-
-	fflush(NULL);
-	pid = fork();
-	if (pid < 0)
-		die("unable to fork");
-	if (!pid) {
-		execvp(pgm, (char *const*) arg);
-		exit(255);
-	}
-
-	while (waitpid(pid, &status, 0) < 0) {
-		if (errno == EINTR)
-			continue;
-		return -1;
-	}
-
-	/* Earlier we did not check the exit status because
-	 * diff exits non-zero if files are different, and
-	 * we are not interested in knowing that.  It was a
-	 * mistake which made it harder to quit a diff-*
-	 * session that uses the git-apply-patch-script as
-	 * the GIT_EXTERNAL_DIFF.  A custom GIT_EXTERNAL_DIFF
-	 * should also exit non-zero only when it wants to
-	 * abort the entire diff-* session.
-	 */
-	if (WIFEXITED(status) && !WEXITSTATUS(status))
-		return 0;
-	return -1;
-}
-
 /* An external diff command takes:
  *
  * diff-cmd name infile1 infile1-sha1 infile1-mode \
@@ -1882,7 +1814,8 @@ static void run_external_diff(const char *pgm,
 		*arg++ = name;
 	}
 	*arg = NULL;
-	retval = spawn_prog(pgm, spawn_arg);
+	fflush(NULL);
+	retval = run_command_v_opt(spawn_arg, 0);
 	remove_tempfile();
 	if (retval) {
 		fprintf(stderr, "external diff died, stopping at %s.\n", name);
@@ -1920,7 +1853,7 @@ static void run_diff_cmd(const char *pgm,
 			 struct diff_options *o,
 			 int complete_rewrite)
 {
-	if (!o->allow_external)
+	if (!DIFF_OPT_TST(o, ALLOW_EXTERNAL))
 		pgm = NULL;
 	else {
 		const char *cmd = external_diff_attr(name);
@@ -1967,50 +1900,46 @@ static int similarity_index(struct diff_filepair *p)
 static void run_diff(struct diff_filepair *p, struct diff_options *o)
 {
 	const char *pgm = external_diff();
-	char msg[PATH_MAX*2+300], *xfrm_msg;
-	struct diff_filespec *one;
-	struct diff_filespec *two;
+	struct strbuf msg;
+	char *xfrm_msg;
+	struct diff_filespec *one = p->one;
+	struct diff_filespec *two = p->two;
 	const char *name;
 	const char *other;
-	char *name_munged, *other_munged;
 	int complete_rewrite = 0;
-	int len;
+
 
 	if (DIFF_PAIR_UNMERGED(p)) {
-		/* unmerged */
 		run_diff_cmd(pgm, p->one->path, NULL, NULL, NULL, NULL, o, 0);
 		return;
 	}
 
-	name = p->one->path;
+	name  = p->one->path;
 	other = (strcmp(name, p->two->path) ? p->two->path : NULL);
-	name_munged = quote_one(name);
-	other_munged = quote_one(other);
-	one = p->one; two = p->two;
-
 	diff_fill_sha1_info(one);
 	diff_fill_sha1_info(two);
 
-	len = 0;
+	strbuf_init(&msg, PATH_MAX * 2 + 300);
 	switch (p->status) {
 	case DIFF_STATUS_COPIED:
-		len += snprintf(msg + len, sizeof(msg) - len,
-				"similarity index %d%%\n"
-				"copy from %s\n"
-				"copy to %s\n",
-				similarity_index(p), name_munged, other_munged);
+		strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
+		strbuf_addstr(&msg, "\ncopy from ");
+		quote_c_style(name, &msg, NULL, 0);
+		strbuf_addstr(&msg, "\ncopy to ");
+		quote_c_style(other, &msg, NULL, 0);
+		strbuf_addch(&msg, '\n');
 		break;
 	case DIFF_STATUS_RENAMED:
-		len += snprintf(msg + len, sizeof(msg) - len,
-				"similarity index %d%%\n"
-				"rename from %s\n"
-				"rename to %s\n",
-				similarity_index(p), name_munged, other_munged);
+		strbuf_addf(&msg, "similarity index %d%%", similarity_index(p));
+		strbuf_addstr(&msg, "\nrename from ");
+		quote_c_style(name, &msg, NULL, 0);
+		strbuf_addstr(&msg, "\nrename to ");
+		quote_c_style(other, &msg, NULL, 0);
+		strbuf_addch(&msg, '\n');
 		break;
 	case DIFF_STATUS_MODIFIED:
 		if (p->score) {
-			len += snprintf(msg + len, sizeof(msg) - len,
-					"dissimilarity index %d%%\n",
+			strbuf_addf(&msg, "dissimilarity index %d%%\n",
 					similarity_index(p));
 			complete_rewrite = 1;
 			break;
@@ -2022,27 +1951,25 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
 	}
 
 	if (hashcmp(one->sha1, two->sha1)) {
-		int abbrev = o->full_index ? 40 : DEFAULT_ABBREV;
+		int abbrev = DIFF_OPT_TST(o, FULL_INDEX) ? 40 : DEFAULT_ABBREV;
 
-		if (o->binary) {
+		if (DIFF_OPT_TST(o, BINARY)) {
 			mmfile_t mf;
 			if ((!fill_mmfile(&mf, one) && diff_filespec_is_binary(one)) ||
 			    (!fill_mmfile(&mf, two) && diff_filespec_is_binary(two)))
 				abbrev = 40;
 		}
-		len += snprintf(msg + len, sizeof(msg) - len,
-				"index %.*s..%.*s",
+		strbuf_addf(&msg, "index %.*s..%.*s",
 				abbrev, sha1_to_hex(one->sha1),
 				abbrev, sha1_to_hex(two->sha1));
 		if (one->mode == two->mode)
-			len += snprintf(msg + len, sizeof(msg) - len,
-					" %06o", one->mode);
-		len += snprintf(msg + len, sizeof(msg) - len, "\n");
+			strbuf_addf(&msg, " %06o", one->mode);
+		strbuf_addch(&msg, '\n');
 	}
 
-	if (len)
-		msg[--len] = 0;
-	xfrm_msg = len ? msg : NULL;
+	if (msg.len)
+		strbuf_setlen(&msg, msg.len - 1);
+	xfrm_msg = msg.len ? msg.buf : NULL;
 
 	if (!pgm &&
 	    DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
@@ -2061,8 +1988,7 @@ static void run_diff(struct diff_filepair *p, struct diff_options *o)
 		run_diff_cmd(pgm, name, other, one, two, xfrm_msg, o,
 			     complete_rewrite);
 
-	free(name_munged);
-	free(other_munged);
+	strbuf_release(&msg);
 }
 
 static void run_diffstat(struct diff_filepair *p, struct diff_options *o,
@@ -2119,7 +2045,10 @@ void diff_setup(struct diff_options *options)
 
 	options->change = diff_change;
 	options->add_remove = diff_addremove;
-	options->color_diff = diff_use_color_default;
+	if (diff_use_color_default)
+		DIFF_OPT_SET(options, COLOR_DIFF);
+	else
+		DIFF_OPT_CLR(options, COLOR_DIFF);
 	options->detect_rename = diff_detect_rename_default;
 }
 
@@ -2138,7 +2067,7 @@ int diff_setup_done(struct diff_options *options)
 	if (count > 1)
 		die("--name-only, --name-status, --check and -s are mutually exclusive");
 
-	if (options->find_copies_harder)
+	if (DIFF_OPT_TST(options, FIND_COPIES_HARDER))
 		options->detect_rename = DIFF_DETECT_COPY;
 
 	if (options->output_format & (DIFF_FORMAT_NAME |
@@ -2162,12 +2091,12 @@ int diff_setup_done(struct diff_options *options)
 				      DIFF_FORMAT_SHORTSTAT |
 				      DIFF_FORMAT_SUMMARY |
 				      DIFF_FORMAT_CHECKDIFF))
-		options->recursive = 1;
+		DIFF_OPT_SET(options, RECURSIVE);
 	/*
 	 * Also pickaxe would not work very well if you do not say recursive
 	 */
 	if (options->pickaxe)
-		options->recursive = 1;
+		DIFF_OPT_SET(options, RECURSIVE);
 
 	if (options->detect_rename && options->rename_limit < 0)
 		options->rename_limit = diff_rename_limit_default;
@@ -2189,9 +2118,9 @@ int diff_setup_done(struct diff_options *options)
 	 * to have found.  It does not make sense not to return with
 	 * exit code in such a case either.
 	 */
-	if (options->quiet) {
+	if (DIFF_OPT_TST(options, QUIET)) {
 		options->output_format = DIFF_FORMAT_NO_OUTPUT;
-		options->exit_with_status = 1;
+		DIFF_OPT_SET(options, EXIT_WITH_STATUS);
 	}
 
 	/*
@@ -2199,7 +2128,7 @@ int diff_setup_done(struct diff_options *options)
 	 * upon the first hit.  We need to run diff as usual.
 	 */
 	if (options->pickaxe || options->filter)
-		options->quiet = 0;
+		DIFF_OPT_CLR(options, QUIET);
 
 	return 0;
 }
@@ -2256,21 +2185,32 @@ static int diff_scoreopt_parse(const char *opt);
 int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 {
 	const char *arg = av[0];
+
+	/* Output format options */
 	if (!strcmp(arg, "-p") || !strcmp(arg, "-u"))
 		options->output_format |= DIFF_FORMAT_PATCH;
 	else if (opt_arg(arg, 'U', "unified", &options->context))
 		options->output_format |= DIFF_FORMAT_PATCH;
 	else if (!strcmp(arg, "--raw"))
 		options->output_format |= DIFF_FORMAT_RAW;
-	else if (!strcmp(arg, "--patch-with-raw")) {
+	else if (!strcmp(arg, "--patch-with-raw"))
 		options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_RAW;
-	}
-	else if (!strcmp(arg, "--numstat")) {
+	else if (!strcmp(arg, "--numstat"))
 		options->output_format |= DIFF_FORMAT_NUMSTAT;
-	}
-	else if (!strcmp(arg, "--shortstat")) {
+	else if (!strcmp(arg, "--shortstat"))
 		options->output_format |= DIFF_FORMAT_SHORTSTAT;
-	}
+	else if (!strcmp(arg, "--check"))
+		options->output_format |= DIFF_FORMAT_CHECKDIFF;
+	else if (!strcmp(arg, "--summary"))
+		options->output_format |= DIFF_FORMAT_SUMMARY;
+	else if (!strcmp(arg, "--patch-with-stat"))
+		options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
+	else if (!strcmp(arg, "--name-only"))
+		options->output_format |= DIFF_FORMAT_NAME;
+	else if (!strcmp(arg, "--name-status"))
+		options->output_format |= DIFF_FORMAT_NAME_STATUS;
+	else if (!strcmp(arg, "-s"))
+		options->output_format |= DIFF_FORMAT_NO_OUTPUT;
 	else if (!prefixcmp(arg, "--stat")) {
 		char *end;
 		int width = options->stat_width;
@@ -2298,99 +2238,89 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		options->stat_name_width = name_width;
 		options->stat_width = width;
 	}
-	else if (!strcmp(arg, "--check"))
-		options->output_format |= DIFF_FORMAT_CHECKDIFF;
-	else if (!strcmp(arg, "--summary"))
-		options->output_format |= DIFF_FORMAT_SUMMARY;
-	else if (!strcmp(arg, "--patch-with-stat")) {
-		options->output_format |= DIFF_FORMAT_PATCH | DIFF_FORMAT_DIFFSTAT;
-	}
-	else if (!strcmp(arg, "-z"))
-		options->line_termination = 0;
-	else if (!prefixcmp(arg, "-l"))
-		options->rename_limit = strtoul(arg+2, NULL, 10);
-	else if (!strcmp(arg, "--full-index"))
-		options->full_index = 1;
-	else if (!strcmp(arg, "--binary")) {
-		options->output_format |= DIFF_FORMAT_PATCH;
-		options->binary = 1;
-	}
-	else if (!strcmp(arg, "-a") || !strcmp(arg, "--text")) {
-		options->text = 1;
-	}
-	else if (!strcmp(arg, "--name-only"))
-		options->output_format |= DIFF_FORMAT_NAME;
-	else if (!strcmp(arg, "--name-status"))
-		options->output_format |= DIFF_FORMAT_NAME_STATUS;
-	else if (!strcmp(arg, "-R"))
-		options->reverse_diff = 1;
-	else if (!prefixcmp(arg, "-S"))
-		options->pickaxe = arg + 2;
-	else if (!strcmp(arg, "-s")) {
-		options->output_format |= DIFF_FORMAT_NO_OUTPUT;
-	}
-	else if (!prefixcmp(arg, "-O"))
-		options->orderfile = arg + 2;
-	else if (!prefixcmp(arg, "--diff-filter="))
-		options->filter = arg + 14;
-	else if (!strcmp(arg, "--pickaxe-all"))
-		options->pickaxe_opts = DIFF_PICKAXE_ALL;
-	else if (!strcmp(arg, "--pickaxe-regex"))
-		options->pickaxe_opts = DIFF_PICKAXE_REGEX;
+
+	/* renames options */
 	else if (!prefixcmp(arg, "-B")) {
-		if ((options->break_opt =
-		     diff_scoreopt_parse(arg)) == -1)
+		if ((options->break_opt = diff_scoreopt_parse(arg)) == -1)
 			return -1;
 	}
 	else if (!prefixcmp(arg, "-M")) {
-		if ((options->rename_score =
-		     diff_scoreopt_parse(arg)) == -1)
+		if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
 			return -1;
 		options->detect_rename = DIFF_DETECT_RENAME;
 	}
 	else if (!prefixcmp(arg, "-C")) {
 		if (options->detect_rename == DIFF_DETECT_COPY)
-			options->find_copies_harder = 1;
-		if ((options->rename_score =
-		     diff_scoreopt_parse(arg)) == -1)
+			DIFF_OPT_SET(options, FIND_COPIES_HARDER);
+		if ((options->rename_score = diff_scoreopt_parse(arg)) == -1)
 			return -1;
 		options->detect_rename = DIFF_DETECT_COPY;
 	}
-	else if (!strcmp(arg, "--find-copies-harder"))
-		options->find_copies_harder = 1;
-	else if (!strcmp(arg, "--follow"))
-		options->follow_renames = 1;
-	else if (!strcmp(arg, "--abbrev"))
-		options->abbrev = DEFAULT_ABBREV;
-	else if (!prefixcmp(arg, "--abbrev=")) {
-		options->abbrev = strtoul(arg + 9, NULL, 10);
-		if (options->abbrev < MINIMUM_ABBREV)
-			options->abbrev = MINIMUM_ABBREV;
-		else if (40 < options->abbrev)
-			options->abbrev = 40;
-	}
-	else if (!strcmp(arg, "--color"))
-		options->color_diff = 1;
-	else if (!strcmp(arg, "--no-color"))
-		options->color_diff = 0;
+	else if (!strcmp(arg, "--no-renames"))
+		options->detect_rename = 0;
+
+	/* xdiff options */
 	else if (!strcmp(arg, "-w") || !strcmp(arg, "--ignore-all-space"))
 		options->xdl_opts |= XDF_IGNORE_WHITESPACE;
 	else if (!strcmp(arg, "-b") || !strcmp(arg, "--ignore-space-change"))
 		options->xdl_opts |= XDF_IGNORE_WHITESPACE_CHANGE;
 	else if (!strcmp(arg, "--ignore-space-at-eol"))
 		options->xdl_opts |= XDF_IGNORE_WHITESPACE_AT_EOL;
+
+	/* flags options */
+	else if (!strcmp(arg, "--binary")) {
+		options->output_format |= DIFF_FORMAT_PATCH;
+		DIFF_OPT_SET(options, BINARY);
+	}
+	else if (!strcmp(arg, "--full-index"))
+		DIFF_OPT_SET(options, FULL_INDEX);
+	else if (!strcmp(arg, "-a") || !strcmp(arg, "--text"))
+		DIFF_OPT_SET(options, TEXT);
+	else if (!strcmp(arg, "-R"))
+		DIFF_OPT_SET(options, REVERSE_DIFF);
+	else if (!strcmp(arg, "--find-copies-harder"))
+		DIFF_OPT_SET(options, FIND_COPIES_HARDER);
+	else if (!strcmp(arg, "--follow"))
+		DIFF_OPT_SET(options, FOLLOW_RENAMES);
+	else if (!strcmp(arg, "--color"))
+		DIFF_OPT_SET(options, COLOR_DIFF);
+	else if (!strcmp(arg, "--no-color"))
+		DIFF_OPT_CLR(options, COLOR_DIFF);
 	else if (!strcmp(arg, "--color-words"))
-		options->color_diff = options->color_diff_words = 1;
-	else if (!strcmp(arg, "--no-renames"))
-		options->detect_rename = 0;
+		options->flags |= DIFF_OPT_COLOR_DIFF | DIFF_OPT_COLOR_DIFF_WORDS;
 	else if (!strcmp(arg, "--exit-code"))
-		options->exit_with_status = 1;
+		DIFF_OPT_SET(options, EXIT_WITH_STATUS);
 	else if (!strcmp(arg, "--quiet"))
-		options->quiet = 1;
+		DIFF_OPT_SET(options, QUIET);
 	else if (!strcmp(arg, "--ext-diff"))
-		options->allow_external = 1;
+		DIFF_OPT_SET(options, ALLOW_EXTERNAL);
 	else if (!strcmp(arg, "--no-ext-diff"))
-		options->allow_external = 0;
+		DIFF_OPT_CLR(options, ALLOW_EXTERNAL);
+
+	/* misc options */
+	else if (!strcmp(arg, "-z"))
+		options->line_termination = 0;
+	else if (!prefixcmp(arg, "-l"))
+		options->rename_limit = strtoul(arg+2, NULL, 10);
+	else if (!prefixcmp(arg, "-S"))
+		options->pickaxe = arg + 2;
+	else if (!strcmp(arg, "--pickaxe-all"))
+		options->pickaxe_opts = DIFF_PICKAXE_ALL;
+	else if (!strcmp(arg, "--pickaxe-regex"))
+		options->pickaxe_opts = DIFF_PICKAXE_REGEX;
+	else if (!prefixcmp(arg, "-O"))
+		options->orderfile = arg + 2;
+	else if (!prefixcmp(arg, "--diff-filter="))
+		options->filter = arg + 14;
+	else if (!strcmp(arg, "--abbrev"))
+		options->abbrev = DEFAULT_ABBREV;
+	else if (!prefixcmp(arg, "--abbrev=")) {
+		options->abbrev = strtoul(arg + 9, NULL, 10);
+		if (options->abbrev < MINIMUM_ABBREV)
+			options->abbrev = MINIMUM_ABBREV;
+		else if (40 < options->abbrev)
+			options->abbrev = 40;
+	}
 	else
 		return 0;
 	return 1;
@@ -2486,10 +2416,8 @@ struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
 
 void diff_free_filepair(struct diff_filepair *p)
 {
-	diff_free_filespec_data(p->one);
-	diff_free_filespec_data(p->two);
-	free(p->one);
-	free(p->two);
+	free_filespec(p->one);
+	free_filespec(p->two);
 	free(p);
 }
 
@@ -2518,72 +2446,30 @@ const char *diff_unique_abbrev(const unsigned char *sha1, int len)
 	return sha1_to_hex(sha1);
 }
 
-static void diff_flush_raw(struct diff_filepair *p,
-			   struct diff_options *options)
+static void diff_flush_raw(struct diff_filepair *p, struct diff_options *opt)
 {
-	int two_paths;
-	char status[10];
-	int abbrev = options->abbrev;
-	const char *path_one, *path_two;
-	int inter_name_termination = '\t';
-	int line_termination = options->line_termination;
+	int line_termination = opt->line_termination;
+	int inter_name_termination = line_termination ? '\t' : '\0';
 
-	if (!line_termination)
-		inter_name_termination = 0;
-
-	path_one = p->one->path;
-	path_two = p->two->path;
-	if (line_termination) {
-		path_one = quote_one(path_one);
-		path_two = quote_one(path_two);
-	}
-
-	if (p->score)
-		sprintf(status, "%c%03d", p->status, similarity_index(p));
-	else {
-		status[0] = p->status;
-		status[1] = 0;
-	}
-	switch (p->status) {
-	case DIFF_STATUS_COPIED:
-	case DIFF_STATUS_RENAMED:
-		two_paths = 1;
-		break;
-	case DIFF_STATUS_ADDED:
-	case DIFF_STATUS_DELETED:
-		two_paths = 0;
-		break;
-	default:
-		two_paths = 0;
-		break;
+	if (!(opt->output_format & DIFF_FORMAT_NAME_STATUS)) {
+		printf(":%06o %06o %s ", p->one->mode, p->two->mode,
+		       diff_unique_abbrev(p->one->sha1, opt->abbrev));
+		printf("%s ", diff_unique_abbrev(p->two->sha1, opt->abbrev));
 	}
-	if (!(options->output_format & DIFF_FORMAT_NAME_STATUS)) {
-		printf(":%06o %06o %s ",
-		       p->one->mode, p->two->mode,
-		       diff_unique_abbrev(p->one->sha1, abbrev));
-		printf("%s ",
-		       diff_unique_abbrev(p->two->sha1, abbrev));
+	if (p->score) {
+		printf("%c%03d%c", p->status, similarity_index(p),
+			   inter_name_termination);
+	} else {
+		printf("%c%c", p->status, inter_name_termination);
 	}
-	printf("%s%c%s", status, inter_name_termination,
-			two_paths || p->one->mode ?  path_one : path_two);
-	if (two_paths)
-		printf("%c%s", inter_name_termination, path_two);
-	putchar(line_termination);
-	if (path_one != p->one->path)
-		free((void*)path_one);
-	if (path_two != p->two->path)
-		free((void*)path_two);
-}
 
-static void diff_flush_name(struct diff_filepair *p, struct diff_options *opt)
-{
-	char *path = p->two->path;
-
-	if (opt->line_termination)
-		path = quote_one(p->two->path);
-	printf("%s%c", path, opt->line_termination);
-	if (p->two->path != path)
-		free(path);
+	if (p->status == DIFF_STATUS_COPIED || p->status == DIFF_STATUS_RENAMED) {
+		write_name_quoted(p->one->path, stdout, inter_name_termination);
+		write_name_quoted(p->two->path, stdout, line_termination);
+	} else {
+		const char *path = p->one->mode ? p->one->path : p->two->path;
+		write_name_quoted(path, stdout, line_termination);
+	}
 }
 
 int diff_unmodified_pair(struct diff_filepair *p)
@@ -2593,14 +2479,11 @@ int diff_unmodified_pair(struct diff_filepair *p)
 	 * let transformers to produce diff_filepairs any way they want,
 	 * and filter and clean them up here before producing the output.
 	 */
-	struct diff_filespec *one, *two;
+	struct diff_filespec *one = p->one, *two = p->two;
 
 	if (DIFF_PAIR_UNMERGED(p))
 		return 0; /* unmerged is interesting */
 
-	one = p->one;
-	two = p->two;
-
 	/* deletion, addition, mode or type change
 	 * and rename are all interesting.
 	 */
@@ -2686,9 +2569,9 @@ void diff_debug_filepair(const struct diff_filepair *p, int i)
 {
 	diff_debug_filespec(p->one, i, "one");
 	diff_debug_filespec(p->two, i, "two");
-	fprintf(stderr, "score %d, status %c stays %d broken %d\n",
+	fprintf(stderr, "score %d, status %c rename_used %d broken %d\n",
 		p->score, p->status ? p->status : '?',
-		p->source_stays, p->broken_pair);
+		p->one->rename_used, p->broken_pair);
 }
 
 void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
@@ -2706,8 +2589,8 @@ void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
 
 static void diff_resolve_rename_copy(void)
 {
-	int i, j;
-	struct diff_filepair *p, *pp;
+	int i;
+	struct diff_filepair *p;
 	struct diff_queue_struct *q = &diff_queued_diff;
 
 	diff_debug_queue("resolve-rename-copy", q);
@@ -2729,27 +2612,21 @@ static void diff_resolve_rename_copy(void)
 		 * either in-place edit or rename/copy edit.
 		 */
 		else if (DIFF_PAIR_RENAME(p)) {
-			if (p->source_stays) {
-				p->status = DIFF_STATUS_COPIED;
-				continue;
-			}
-			/* See if there is some other filepair that
-			 * copies from the same source as us.  If so
-			 * we are a copy.  Otherwise we are either a
-			 * copy if the path stays, or a rename if it
-			 * does not, but we already handled "stays" case.
+			/*
+			 * A rename might have re-connected a broken
+			 * pair up, causing the pathnames to be the
+			 * same again. If so, that's not a rename at
+			 * all, just a modification..
+			 *
+			 * Otherwise, see if this source was used for
+			 * multiple renames, in which case we decrement
+			 * the count, and call it a copy.
 			 */
-			for (j = i + 1; j < q->nr; j++) {
-				pp = q->queue[j];
-				if (strcmp(pp->one->path, p->one->path))
-					continue; /* not us */
-				if (!DIFF_PAIR_RENAME(pp))
-					continue; /* not a rename/copy */
-				/* pp is a rename/copy from the same source */
+			if (!strcmp(p->one->path, p->two->path))
+				p->status = DIFF_STATUS_MODIFIED;
+			else if (--p->one->rename_used > 0)
 				p->status = DIFF_STATUS_COPIED;
-				break;
-			}
-			if (!p->status)
+			else
 				p->status = DIFF_STATUS_RENAMED;
 		}
 		else if (hashcmp(p->one->sha1, p->two->sha1) ||
@@ -2789,32 +2666,27 @@ static void flush_one_pair(struct diff_filepair *p, struct diff_options *opt)
 	else if (fmt & (DIFF_FORMAT_RAW | DIFF_FORMAT_NAME_STATUS))
 		diff_flush_raw(p, opt);
 	else if (fmt & DIFF_FORMAT_NAME)
-		diff_flush_name(p, opt);
+		write_name_quoted(p->two->path, stdout, opt->line_termination);
 }
 
 static void show_file_mode_name(const char *newdelete, struct diff_filespec *fs)
 {
-	char *name = quote_one(fs->path);
 	if (fs->mode)
-		printf(" %s mode %06o %s\n", newdelete, fs->mode, name);
+		printf(" %s mode %06o ", newdelete, fs->mode);
 	else
-		printf(" %s %s\n", newdelete, name);
-	free(name);
+		printf(" %s ", newdelete);
+	write_name_quoted(fs->path, stdout, '\n');
 }
 
 
 static void show_mode_change(struct diff_filepair *p, int show_name)
 {
 	if (p->one->mode && p->two->mode && p->one->mode != p->two->mode) {
+		printf(" mode change %06o => %06o%c", p->one->mode, p->two->mode,
+			show_name ? ' ' : '\n');
 		if (show_name) {
-			char *name = quote_one(p->two->path);
-			printf(" mode change %06o => %06o %s\n",
-			       p->one->mode, p->two->mode, name);
-			free(name);
+			write_name_quoted(p->two->path, stdout, '\n');
 		}
-		else
-			printf(" mode change %06o => %06o\n",
-			       p->one->mode, p->two->mode);
 	}
 }
 
@@ -2844,12 +2716,11 @@ static void diff_summary(struct diff_filepair *p)
 		break;
 	default:
 		if (p->score) {
-			char *name = quote_one(p->two->path);
-			printf(" rewrite %s (%d%%)\n", name,
-			       similarity_index(p));
-			free(name);
-			show_mode_change(p, 0);
-		} else	show_mode_change(p, 1);
+			puts(" rewrite ");
+			write_name_quoted(p->two->path, stdout, ' ');
+			printf("(%d%%)\n", similarity_index(p));
+		}
+		show_mode_change(p, !p->score);
 		break;
 	}
 }
@@ -2863,14 +2734,14 @@ struct patch_id_t {
 static int remove_space(char *line, int len)
 {
 	int i;
-        char *dst = line;
-        unsigned char c;
+	char *dst = line;
+	unsigned char c;
 
-        for (i = 0; i < len; i++)
-                if (!isspace((c = line[i])))
-                        *dst++ = c;
+	for (i = 0; i < len; i++)
+		if (!isspace((c = line[i])))
+			*dst++ = c;
 
-        return dst - line;
+	return dst - line;
 }
 
 static void patch_id_consume(void *priv, char *line, unsigned long len)
@@ -3204,7 +3075,7 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
 			 * to determine how many paths were dirty only
 			 * due to stat info mismatch.
 			 */
-			if (!diffopt->no_index)
+			if (!DIFF_OPT_TST(diffopt, NO_INDEX))
 				diffopt->skip_stat_unmatch++;
 			diff_free_filepair(p);
 		}
@@ -3215,10 +3086,10 @@ static void diffcore_skip_stat_unmatch(struct diff_options *diffopt)
 
 void diffcore_std(struct diff_options *options)
 {
-	if (options->quiet)
+	if (DIFF_OPT_TST(options, QUIET))
 		return;
 
-	if (options->skip_stat_unmatch && !options->find_copies_harder)
+	if (options->skip_stat_unmatch && !DIFF_OPT_TST(options, FIND_COPIES_HARDER))
 		diffcore_skip_stat_unmatch(options);
 	if (options->break_opt != -1)
 		diffcore_break(options->break_opt);
@@ -3233,7 +3104,10 @@ void diffcore_std(struct diff_options *options)
 	diff_resolve_rename_copy();
 	diffcore_apply_filter(options->filter);
 
-	options->has_changes = !!diff_queued_diff.nr;
+	if (diff_queued_diff.nr)
+		DIFF_OPT_SET(options, HAS_CHANGES);
+	else
+		DIFF_OPT_CLR(options, HAS_CHANGES);
 }
 
 
@@ -3257,7 +3131,7 @@ void diff_addremove(struct diff_options *options,
 	 * Before the final output happens, they are pruned after
 	 * merged into rename/copy pairs as appropriate.
 	 */
-	if (options->reverse_diff)
+	if (DIFF_OPT_TST(options, REVERSE_DIFF))
 		addremove = (addremove == '+' ? '-' :
 			     addremove == '-' ? '+' : addremove);
 
@@ -3272,7 +3146,7 @@ void diff_addremove(struct diff_options *options,
 		fill_filespec(two, sha1, mode);
 
 	diff_queue(&diff_queued_diff, one, two);
-	options->has_changes = 1;
+	DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
 void diff_change(struct diff_options *options,
@@ -3284,7 +3158,7 @@ void diff_change(struct diff_options *options,
 	char concatpath[PATH_MAX];
 	struct diff_filespec *one, *two;
 
-	if (options->reverse_diff) {
+	if (DIFF_OPT_TST(options, REVERSE_DIFF)) {
 		unsigned tmp;
 		const unsigned char *tmp_c;
 		tmp = old_mode; old_mode = new_mode; new_mode = tmp;
@@ -3298,7 +3172,7 @@ void diff_change(struct diff_options *options,
 	fill_filespec(two, new_sha1, new_mode);
 
 	diff_queue(&diff_queued_diff, one, two);
-	options->has_changes = 1;
+	DIFF_OPT_SET(options, HAS_CHANGES);
 }
 
 void diff_unmerge(struct diff_options *options,