Function pprint_rename

diff.c:2725–2800

}

static void pprint_rename(struct strbuf *name, const char *a, const char *b)
{
	const char *old_name = a;
	const char *new_name = b;
	int pfx_length, sfx_length;
	int pfx_adjust_for_slash;
	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);

	if (qlen_a || qlen_b) {
		quote_c_style(a, name, NULL, 0);
		strbuf_addstr(name, " => ");
		quote_c_style(b, name, NULL, 0);
		return;
	}

	/* Find common prefix */
	pfx_length = 0;
	while (*old_name && *new_name && *old_name == *new_name) {
		if (*old_name == '/')
			pfx_length = old_name - a + 1;
		old_name++;
		new_name++;
	}

	/* Find common suffix */
	old_name = a + len_a;
	new_name = b + len_b;
	sfx_length = 0;
	/*
	 * If there is a common prefix, it must end in a slash.  In
	 * that case we let this loop run 1 into the prefix to see the
	 * same slash.
	 *
	 * If there is no common prefix, we cannot do this as it would
	 * underrun the input strings.
	 */
	pfx_adjust_for_slash = (pfx_length ? 1 : 0);
	while (a + pfx_length - pfx_adjust_for_slash <= old_name &&
	       b + pfx_length - pfx_adjust_for_slash <= new_name &&
	       *old_name == *new_name) {
		if (*old_name == '/')
			sfx_length = len_a - (old_name - a);
		old_name--;
		new_name--;
	}

	/*
	 * pfx{mid-a => mid-b}sfx
	 * {pfx-a => pfx-b}sfx
	 * 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;