From 08ec67bc62242503f77d9503fdbf820c9c12d856 Mon Sep 17 00:00:00 2001
From: Denis Vlasenko <vda.linux@googlemail.com>
Date: Wed, 26 Mar 2008 13:32:30 +0000
Subject: [PATCH] patch: add support for -R. ~ +110 byte. By Pascal Bellard
 <pascal.bellard AT ads-lu.com> fbsplash: new applet by Michele Sanges
 <michele.sanges AT otomelara.it

function                                             old     new   delta
fbsplash_main                                          -    1525   +1525
fb_drawfullrectangle                                   -     118    +118
static.param_value                                     -     100    +100
packed_usage                                       23776   23872     +96
applet_names                                        1843    1852      +9
applet_main                                         1120    1124      +4
read_line_input                                     3156    3158      +2
applet_nameofs                                       560     562      +2
applet_install_loc                                   140     141      +1
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 6/0 up/down: 1857/0)           Total: 1857 bytes
   text    data     bss     dec     hex filename
 799233     641    7380  807254   c5156 busybox_old
 801202     641    7380  809223   c5907 busybox_unstripped
---
 editors/patch.c       | 52 ++++++++++++++++++++++++++++---------------
 include/applets.h     |  1 +
 include/usage.h       | 14 +++++++++++-
 libbb/lineedit.c      | 14 +++++++-----
 miscutils/Config.in   | 33 ++++++++++++++++++++++-----
 miscutils/Kbuild      |  1 +
 testsuite/patch.tests | 20 ++++++++++++++++-
 7 files changed, 103 insertions(+), 32 deletions(-)

diff --git a/editors/patch.c b/editors/patch.c
index 2a2b130b9..6f42b835c 100644
--- a/editors/patch.c
+++ b/editors/patch.c
@@ -21,7 +21,7 @@
 
 #include "libbb.h"
 
-static unsigned copy_lines(FILE *src_stream, FILE *dest_stream, unsigned lines_count)
+static unsigned copy_lines(FILE *src_stream, FILE *dst_stream, unsigned lines_count)
 {
 	while (src_stream && lines_count) {
 		char *line;
@@ -29,7 +29,7 @@ static unsigned copy_lines(FILE *src_stream, FILE *dest_stream, unsigned lines_c
 		if (line == NULL) {
 			break;
 		}
-		if (fputs(line, dest_stream) == EOF) {
+		if (fputs(line, dst_stream) == EOF) {
 			bb_perror_msg_and_die("error writing to new file");
 		}
 		free(line);
@@ -73,12 +73,14 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 	FILE *patch_file;
 	int patch_level;
 	int ret = 0;
+	char plus = '+';
 
 	xfunc_error_retval = 2;
 	{
 		const char *p = "-1";
 		const char *i = "-"; /* compat */
-		getopt32(argv, "p:i:", &p, &i);
+		if (getopt32(argv, "p:i:R", &p, &i) & 4)
+			plus = '-';
 		patch_level = xatoi(p); /* can be negative! */
 		patch_file = xfopen_stdin(i);
 	}
@@ -91,8 +93,8 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		char *new_filename;
 		char *backup_filename;
 		unsigned src_cur_line = 1;
-		unsigned dest_cur_line = 0;
-		unsigned dest_beg_line;
+		unsigned dst_cur_line = 0;
+		unsigned dst_beg_line;
 		unsigned bad_hunk_count = 0;
 		unsigned hunk_count = 0;
 		smallint copy_trailing_lines_flag = 0;
@@ -143,15 +145,26 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			unsigned src_beg_line;
 			unsigned hunk_offset_start;
 			unsigned src_last_line = 1;
+			unsigned dst_last_line = 1;
 
-			if ((sscanf(patch_line, "@@ -%d,%d +%d", &src_beg_line, &src_last_line, &dest_beg_line) != 3)
-			 && (sscanf(patch_line, "@@ -%d +%d", &src_beg_line, &dest_beg_line) != 2)
-			) { /* No more hunks for this file */
+			if ((sscanf(patch_line, "@@ -%d,%d +%d,%d", &src_beg_line, &src_last_line, &dst_beg_line, &dst_last_line) < 3)
+			 && (sscanf(patch_line, "@@ -%d +%d,%d", &src_beg_line, &dst_beg_line, &dst_last_line) < 2)
+			) {
+				/* No more hunks for this file */
 				break;
 			}
+			if (plus != '+') {
+				/* reverse patch */
+				unsigned tmp = src_last_line;
+				src_last_line = dst_last_line;
+				dst_last_line = tmp;
+				tmp = src_beg_line;
+				src_beg_line = dst_beg_line;
+				dst_beg_line = tmp;
+			}
 			hunk_count++;
 
-			if (src_beg_line && dest_beg_line) {
+			if (src_beg_line && dst_beg_line) {
 				/* Copy unmodified lines upto start of hunk */
 				/* src_beg_line will be 0 if it's a new file */
 				count = src_beg_line - src_cur_line;
@@ -159,14 +172,15 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 					bb_error_msg_and_die("bad src file");
 				}
 				src_cur_line += count;
-				dest_cur_line += count;
+				dst_cur_line += count;
 				copy_trailing_lines_flag = 1;
 			}
 			src_last_line += hunk_offset_start = src_cur_line;
+			dst_last_line += dst_cur_line;
 
 			while (1) {
 				free(patch_line);
-			        patch_line = xmalloc_fgets(patch_file);
+				patch_line = xmalloc_fgets(patch_file);
 				if (patch_line == NULL)
 					break; /* EOF */
 				if ((*patch_line != '-') && (*patch_line != '+')
@@ -174,7 +188,7 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 				) {
 					break; /* End of hunk */
 				}
-				if (*patch_line != '+') { /* '-', ' ' or '\n' */
+				if (*patch_line != plus) { /* '-' or ' ' */
 					char *src_line = NULL;
 					if (src_cur_line == src_last_line)
 						break;
@@ -184,7 +198,8 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 							int diff = strcmp(src_line, patch_line + 1);
 							src_cur_line++;
 							free(src_line);
-							if (diff) src_line = NULL;
+							if (diff)
+								src_line = NULL;
 						}
 					}
 					if (!src_line) {
@@ -192,12 +207,14 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 						bad_hunk_count++;
 						break;
 					}
-					if (*patch_line == '-') {
+					if (*patch_line != ' ') { /* '-' */
 						continue;
 					}
 				}
+				if (dst_cur_line == dst_last_line)
+					break;
 				fputs(patch_line + 1, dst_stream);
-				dest_cur_line++;
+				dst_cur_line++;
 			} /* end of while loop handling one hunk */
 		} /* end of while loop handling one file */
 
@@ -217,7 +234,7 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 			if (backup_filename) {
 				unlink(backup_filename);
 			}
-			if ((dest_cur_line == 0) || (dest_beg_line == 0)) {
+			if ((dst_cur_line == 0) || (dst_beg_line == 0)) {
 				/* The new patched file is empty, remove it */
 				xunlink(new_filename);
 				// /* old_filename and new_filename may be the same file */
@@ -228,8 +245,7 @@ int patch_main(int argc ATTRIBUTE_UNUSED, char **argv)
 		//free(old_filename);
 		free(new_filename);
 	} /* end of "while there are patch lines" */
-quit:
-
+ quit:
 	/* 0 = SUCCESS
 	 * 1 = Some hunks failed
 	 * 2 = More serious problems (exited earlier)
diff --git a/include/applets.h b/include/applets.h
index 13c464887..1917f2afa 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -149,6 +149,7 @@ USE_EXPR(APPLET(expr, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FAKEIDENTD(APPLET(fakeidentd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
 USE_FALSE(APPLET_NOFORK(false, false, _BB_DIR_BIN, _BB_SUID_NEVER, false))
 USE_FBSET(APPLET(fbset, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))
+USE_FBSPLASH(APPLET(fbsplash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_FDFLUSH(APPLET_ODDNAME(fdflush, freeramdisk, _BB_DIR_BIN, _BB_SUID_NEVER, fdflush))
 USE_FDFORMAT(APPLET(fdformat, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_FDISK(APPLET(fdisk, _BB_DIR_SBIN, _BB_SUID_NEVER))
diff --git a/include/usage.h b/include/usage.h
index 71c958260..11f235c89 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -120,6 +120,17 @@
        "$ basename /foo/bar.txt .txt\n" \
        "bar"
 
+#define fbsplash_trivial_usage \
+       "[-c] [-d DEV] [-s IMGFILE] [-i INIFILE] [-f CMD]"
+#define fbsplash_full_usage \
+       "Options:\n" \
+     "\n	-c	Hide cursor" \
+     "\n	-d	Framebuffer device (default /dev/fb0)" \
+     "\n	-s	Splash image" \
+     "\n	-i	Config file" \
+     "\n	-f	Control pipe (else exit after drawing image)" \
+     "\n		commands: 'NN' (% for progressbar) or 'exit'" \
+
 #define brctl_trivial_usage \
        "COMMAND [BRIDGE [INTERFACE]]"
 #define brctl_full_usage \
@@ -2838,10 +2849,11 @@
 	)
 
 #define patch_trivial_usage \
-       "[-p NUM] [-i DIFF]"
+       "[-p NUM] [-i DIFF] [-R]"
 #define patch_full_usage \
        "	-p NUM	Strip NUM leading components from file names" \
      "\n	-i DIFF	Read DIFF instead of stdin" \
+     "\n	-R	Reverse patch" \
 
 #define patch_example_usage \
        "$ patch -p1 < example.diff\n" \
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index b25386bc0..5d65665d3 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -958,14 +958,16 @@ static void load_history(const char *fromfile)
 	FILE *fp;
 	int hi;
 
-	/* cleanup old */
-	for (hi = state->cnt_history; hi > 0;) {
-		hi--;
-		free(state->history[hi]);
-	}
+	/* NB: do not trash old history if file can't be opened */
 
 	fp = fopen(fromfile, "r");
 	if (fp) {
+		/* clean up old history */
+		for (hi = state->cnt_history; hi > 0;) {
+			hi--;
+			free(state->history[hi]);
+		}
+
 		for (hi = 0; hi < MAX_HISTORY;) {
 			char *hl = xmalloc_getline(fp);
 			int l;
@@ -982,8 +984,8 @@ static void load_history(const char *fromfile)
 			state->history[hi++] = hl;
 		}
 		fclose(fp);
+		state->cur_history = state->cnt_history = hi;
 	}
-	state->cur_history = state->cnt_history = hi;
 }
 
 /* state->flags is already checked to be nonzero */
diff --git a/miscutils/Config.in b/miscutils/Config.in
index e149e41c9..04c9a0c54 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -194,12 +194,33 @@ config EJECT
 	  Used to eject cdroms.  (defaults to /dev/cdrom)
 
 config FEATURE_EJECT_SCSI
-  bool "SCSI support"
-  default n
-  depends on EJECT
-  help
-    Add the -s option to eject, this allows to eject SCSI-Devices and
-    usb-storage devices.
+	bool "SCSI support"
+	default n
+	depends on EJECT
+	help
+	  Add the -s option to eject, this allows to eject SCSI-Devices and
+	  usb-storage devices.
+
+config FBSPLASH
+	bool "fbsplash"
+	default n
+	help
+	  Shows splash image and progress bar on framebuffer device.
+	  Can be used during boot phase of an embedded device. ~2kb.
+	  Usage:
+	  - use kernel option 'vga=xxx' or otherwise enable fb device.
+	  - put somewhere the fbsplash.ini file and image in .ppm format.
+	  - $ setsid fbsplash [params] &
+	       -c: hide cursor
+	       -d /dev/fbN: framebuffer device (if not /dev/fb0)
+	       -s path_of_image_file
+	       -i path_of_ini_file
+	       -f path_of_fifo (can be "-" for stdin)
+	  - if you want to run applet only in presence of kernel parameter:
+	    grep -q "fbsplash=on" </proc/cmdline && setsid fbsplash [params] &
+	  - commands for fifo:
+	    "NN" (ASCII decimal number) - percentage to show on progress bar
+	    "exit" (or just close fifo) - well you guessed it
 
 config LAST
 	bool "last"
diff --git a/miscutils/Kbuild b/miscutils/Kbuild
index 51187c556..513c03882 100644
--- a/miscutils/Kbuild
+++ b/miscutils/Kbuild
@@ -14,6 +14,7 @@ lib-$(CONFIG_CRONTAB)     += crontab.o
 lib-$(CONFIG_DC)          += dc.o
 lib-$(CONFIG_DEVFSD)      += devfsd.o
 lib-$(CONFIG_EJECT)       += eject.o
+lib-$(CONFIG_FBSPLASH)    += fbsplash.o
 lib-$(CONFIG_HDPARM)      += hdparm.o
 lib-$(CONFIG_LAST)        += last.o
 lib-$(CONFIG_LESS)        += less.o
diff --git a/testsuite/patch.tests b/testsuite/patch.tests
index 8a957d3f7..cfe69b76a 100755
--- a/testsuite/patch.tests
+++ b/testsuite/patch.tests
@@ -26,7 +26,7 @@ zxc
 " \
 
 testing "patch with nonexistent old_file" \
-	"strace -o zzz patch; echo $?; cat input" \
+	"patch; echo $?; cat input" \
 "\
 patching file input
 0
@@ -44,4 +44,22 @@ zxc
  zxc
 " \
 
+testing "patch -R with nonexistent old_file" \
+	"patch -R; echo $?; cat input" \
+"\
+patching file input
+0
+qwe
+zxc
+" \
+	"qwe\nasd\nzxc\n" \
+"\
+--- input.doesnt_exist	Jan 01 01:01:01 2000
++++ input	Jan 01 01:01:01 2000
+@@ -1,2 +1,3 @@
+ qwe
++asd
+ zxc
+" \
+
 exit $FAILCOUNT