* -F fuzz (number, default 2)
* [file] which file to patch
*/
+//config:config PATCH
+//config: bool "patch (9.1 kb)"
+//config: default y
+//config: help
+//config: Apply a unified diff formatted patch.
//applet:IF_PATCH(APPLET(patch, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_PATCH) += patch.o
-//config:config PATCH
-//config: bool "patch"
-//config: default y
-//config: help
-//config: Apply a unified diff formatted patch.
-
//usage:#define patch_trivial_usage
//usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]"
//usage:#define patch_full_usage "\n\n"
-//usage: IF_LONG_OPTS(
-//usage: " -p,--strip N Strip N leading components from file names"
-//usage: "\n -i,--input DIFF Read DIFF instead of stdin"
-//usage: "\n -R,--reverse Reverse patch"
-//usage: "\n -N,--forward Ignore already applied patches"
-//usage: "\n --dry-run Don't actually change files"
-//usage: "\n -E,--remove-empty-files Remove output files if they become empty"
-//usage: )
-//usage: IF_NOT_LONG_OPTS(
//usage: " -p N Strip N leading components from file names"
//usage: "\n -i DIFF Read DIFF instead of stdin"
//usage: "\n -R Reverse patch"
//usage: "\n -N Ignore already applied patches"
//usage: "\n -E Remove output files if they become empty"
+//usage: IF_LONG_OPTS(
+//usage: "\n --dry-run Don't actually change files"
//usage: )
+/* -u "interpret as unified diff" is supported but not documented: this info is not useful for --help */
//usage:
//usage:#define patch_example_usage
//usage: "$ patch -p1 < example.diff\n"
#include "libbb.h"
+#define PATCH_DEBUG 0
// libbb candidate?
// Free all the elements of a linked list
// Call freeit() on each element before freeing it.
-static
-void dlist_free(struct double_list *list, void (*freeit)(void *data))
+static void dlist_free(struct double_list *list, void (*freeit)(void *data))
{
while (list) {
void *pop = list;
}
// Add an entry before "list" element in (circular) doubly linked list
-static
-struct double_list *dlist_add(struct double_list **list, char *data)
+static struct double_list *dlist_add(struct double_list **list, char *data)
{
struct double_list *llist;
struct double_list *line = xmalloc(sizeof(*line));
} while (0)
-#define FLAG_STR "Rup:i:NEx"
+#define FLAG_STR "Rup:i:NEfg"
/* FLAG_REVERSE must be == 1! Code uses this fact. */
-#define FLAG_REVERSE (1 << 0)
-#define FLAG_u (1 << 1)
-#define FLAG_PATHLEN (1 << 2)
-#define FLAG_INPUT (1 << 3)
-#define FLAG_IGNORE (1 << 4)
-#define FLAG_RMEMPTY (1 << 5)
-//non-standard:
-#define FLAG_DEBUG (1 << 6)
+#define FLAG_REVERSE (1 << 0)
+#define FLAG_u (1 << 1)
+#define FLAG_PATHLEN (1 << 2)
+#define FLAG_INPUT (1 << 3)
+#define FLAG_IGNORE (1 << 4)
+#define FLAG_RMEMPTY (1 << 5)
+#define FLAG_f_unused (1 << 6)
+#define FLAG_g_unused (1 << 7)
+#define FLAG_dry_run ((1 << 8) * ENABLE_LONG_OPTS)
+
// Dispose of a line of input, either by writing it out or discarding it.
// state = 3: write whole line to fileout
// state > 3: write line+1 to fileout when *line != state
-#define PATCH_DEBUG (option_mask32 & FLAG_DEBUG)
-
static void do_line(void *data)
{
struct double_list *dlist = data;
}
xclose(TT.fileout);
- temp = xstrdup(TT.tempname);
- temp[strlen(temp) - 6] = '\0';
- rename(TT.tempname, temp);
- free(temp);
+ if (!ENABLE_LONG_OPTS || TT.tempname[0]) { /* not --dry-run? */
+ temp = xstrdup(TT.tempname);
+ temp[strlen(temp) - 6] = '\0';
+ rename(TT.tempname, temp);
+ free(temp);
+ free(TT.tempname);
+ }
- free(TT.tempname);
TT.tempname = NULL;
}
TT.fileout = TT.filein = -1;
// Abort the copy and delete the temporary file.
close(TT.filein);
close(TT.fileout);
- unlink(TT.tempname);
- free(TT.tempname);
+ if (!ENABLE_LONG_OPTS || TT.tempname[0]) { /* not --dry-run? */
+ unlink(TT.tempname);
+ free(TT.tempname);
+ }
TT.tempname = NULL;
TT.state = 0;
else matcheof = 0;
if (PATCH_DEBUG) fdprintf(2, "HUNK:%s\n", plist->data);
}
- matcheof = matcheof < TT.context;
+ matcheof = !matcheof || matcheof < TT.context;
if (PATCH_DEBUG) fdprintf(2,"MATCHEOF=%c\n", matcheof ? 'Y' : 'N');
plist = TT.current_hunk;
buf = NULL;
if (reverse ? TT.oldlen : TT.newlen) for (;;) {
+//FIXME: this performs 1-byte reads:
char *data = xmalloc_reads(TT.filein, NULL);
TT.linenum++;
// Figure out which line of hunk to compare with next. (Skip lines
// of the hunk we'd be adding.)
while (plist && *plist->data == "+-"[reverse]) {
- if (data && !strcmp(data, plist->data+1)) {
+ if (data && strcmp(data, plist->data+1) == 0) {
if (!backwarn) {
backwarn = TT.linenum;
if (option_mask32 & FLAG_IGNORE) {
// out of buffer.
for (;;) {
+ while (plist && *plist->data == "+-"[reverse]) {
+ if (strcmp(check->data, plist->data+1) == 0
+ && !backwarn
+ ) {
+ backwarn = TT.linenum;
+ if (option_mask32 & FLAG_IGNORE) {
+ dummy_revert = 1;
+ reverse ^= 1;
+ }
+ }
+ plist = plist->next;
+ }
if (!plist || strcmp(check->data, plist->data+1)) {
// Match failed. Write out first line of buffered data and
// recheck remaining buffered data for a new match.
if (PATCH_DEBUG)
- fdprintf(2, "NOT: %s\n", plist->data);
+ fdprintf(2, "NOT: %s\n", plist ? plist->data : "EOF");
TT.state = 3;
check = buf;
// state 1: Found +++ file indicator, look for @@
// state 2: In hunk: counting initial context lines
// state 3: In hunk: getting body
+// Like GNU patch, we don't require a --- line before the +++, and
+// also allow the --- after the +++ line.
int patch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int patch_main(int argc UNUSED_PARAM, char **argv)
long oldlen = oldlen; /* for compiler */
long newlen = newlen; /* for compiler */
+#if ENABLE_LONG_OPTS
+ static const char patch_longopts[] ALIGN1 =
+ "reverse\0" No_argument "R"
+ "unified\0" No_argument "u"
+ "strip\0" Required_argument "p"
+ "input\0" Required_argument "i"
+ "forward\0" No_argument "N"
+# if ENABLE_DESKTOP
+ "remove-empty-files\0" No_argument "E" /*ignored*/
+ /* "debug" Required_argument "x" */
+# endif
+ /* "Assume user knows what [s]he is doing, do not ask any questions": */
+ "force\0" No_argument "f" /*ignored*/
+# if ENABLE_DESKTOP
+ /* "Controls actions when a file is under RCS or SCCS control,
+ * and does not exist or is read-only and matches the default version,
+ * or when a file is under ClearCase control and does not exist..."
+ * IOW: rather obscure option.
+ * But Gentoo's portage does use -g0
+ */
+ "get\0" Required_argument "g" /*ignored*/
+# endif
+ "dry-run\0" No_argument "\xfd"
+# if ENABLE_DESKTOP
+ "backup-if-mismatch\0" No_argument "\xfe" /*ignored*/
+ "no-backup-if-mismatch\0" No_argument "\xff" /*ignored*/
+# endif
+ ;
+#endif
+
INIT_TT();
+#if ENABLE_LONG_OPTS
+ opts = getopt32long(argv, FLAG_STR, patch_longopts, &opt_p, &opt_i);
+#else
opts = getopt32(argv, FLAG_STR, &opt_p, &opt_i);
+#endif
+ //bb_error_msg_and_die("opts:%x", opts);
+
argv += optind;
reverse = opts & FLAG_REVERSE;
TT.prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative!
xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
}
}
- if (argv[0]) {
- oldname = xstrdup(argv[0]);
- newname = xstrdup(argv[0]);
- }
// Loop through the lines in the patch
for(;;) {
}
// Open a new file?
- if (!strncmp("--- ", patchline, 4) || !strncmp("+++ ", patchline, 4)) {
+ if (is_prefixed_with(patchline, "--- ") || is_prefixed_with(patchline, "+++ ")) {
char *s, **name = reverse ? &newname : &oldname;
int i;
// Start a new hunk? Usually @@ -oldline,oldlen +newline,newlen @@
// but a missing ,value means the value is 1.
- } else if (state == 1 && !strncmp("@@ -", patchline, 4)) {
+ } else if (state == 1 && is_prefixed_with(patchline, "@@ -")) {
int i;
char *s = patchline+4;
TT.context = 0;
state = 2;
+ // If the --- line is missing or malformed, either oldname
+ // or (for -R) newname could be NULL -- but not both. Like
+ // GNU patch, proceed based on the +++ line, and avoid SEGVs.
+ if (!oldname)
+ oldname = xstrdup("MISSING_FILENAME");
+ if (!newname)
+ newname = xstrdup("MISSING_FILENAME");
+
// If this is the first hunk, open the file.
if (TT.filein == -1) {
int oldsum, newsum, empty = 0;
// We're deleting oldname if new file is /dev/null (before -p)
// or if new hunk is empty (zero context) after patching
- if (!strcmp(name, "/dev/null") || !(reverse ? oldsum : newsum))
- {
+ if (strcmp(name, "/dev/null") == 0 || !(reverse ? oldsum : newsum)) {
name = reverse ? newname : oldname;
- empty++;
+ empty = 1;
}
- // handle -p path truncation.
- for (i=0, s = name; *s;) {
- if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i) break;
- if (*(s++)=='/') {
- name = s;
- i++;
- }
+ // Handle -p path truncation.
+ for (i = 0, s = name; *s;) {
+ if ((option_mask32 & FLAG_PATHLEN) && TT.prefix == i)
+ break;
+ if (*s++ != '/')
+ continue;
+ while (*s == '/')
+ s++;
+ i++;
+ name = s;
}
+ // If "patch FILE_TO_PATCH", completely ignore name from patch
+ if (argv[0])
+ name = argv[0];
if (empty) {
// File is empty after the patches have been applied
if (option_mask32 & FLAG_RMEMPTY) {
// If flag -E or --remove-empty-files is set
printf("removing %s\n", name);
- xunlink(name);
+ if (!(opts & FLAG_dry_run))
+ xunlink(name);
} else {
printf("patching file %s\n", name);
- xclose(xopen(name, O_WRONLY | O_TRUNC));
+ if (!(opts & FLAG_dry_run))
+ xclose(xopen(name, O_WRONLY | O_TRUNC));
}
// If we've got a file to open, do so.
} else if (!(option_mask32 & FLAG_PATHLEN) || i <= TT.prefix) {
struct stat statbuf;
// If the old file was null, we're creating a new one.
- if (!strcmp(oldname, "/dev/null") || !oldsum) {
+ if (strcmp(oldname, "/dev/null") == 0 || !oldsum) {
printf("creating %s\n", name);
- s = strrchr(name, '/');
- if (s) {
- *s = 0;
- bb_make_directory(name, -1, FILEUTILS_RECUR);
- *s = '/';
+ if (!(opts & FLAG_dry_run)) {
+ s = strrchr(name, '/');
+ if (s) {
+ *s = '\0';
+ bb_make_directory(name, -1, FILEUTILS_RECUR);
+ *s = '/';
+ }
+ TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR);
+ } else {
+ TT.filein = xopen("/dev/null", O_RDONLY);
}
- TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR);
} else {
printf("patching file %s\n", name);
TT.filein = xopen(name, O_RDONLY);
}
- TT.tempname = xasprintf("%sXXXXXX", name);
- TT.fileout = xmkstemp(TT.tempname);
- // Set permissions of output file
- fstat(TT.filein, &statbuf);
- fchmod(TT.fileout, statbuf.st_mode);
-
+ if (!(opts & FLAG_dry_run)) {
+ TT.tempname = xasprintf("%sXXXXXX", name);
+ TT.fileout = xmkstemp(TT.tempname);
+ // Set permissions of output file
+ fstat(TT.filein, &statbuf);
+ fchmod(TT.fileout, statbuf.st_mode);
+ } else {
+ TT.tempname = (char*)"";
+ TT.fileout = xopen("/dev/null", O_WRONLY);
+ }
TT.linenum = 0;
TT.hunknum = 0;
}