From b82ae98ea4d5216d20a5deedab2aa6153562337b Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 21 Nov 2010 05:53:34 +0100 Subject: [PATCH] patch: busyboxify by migrating from toybox to busybox helpers function old new delta get_line 90 128 +38 bbconfig_config_bz2 4959 4965 +6 makedevs_main 1038 1035 -3 fail_hunk 133 130 -3 finish_oldfile 174 124 -50 patch_main 2066 1987 -79 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/4 up/down: 44/-135) Total: -91 bytes Signed-off-by: Denys Vlasenko --- editors/patch.c | 245 ++++++++++++++++++-------------------------------- testsuite/patch.tests | 4 +- 2 files changed, 87 insertions(+), 162 deletions(-) diff --git a/editors/patch.c b/editors/patch.c index 33ff8b5..4fadbb8 100644 --- a/editors/patch.c +++ b/editors/patch.c @@ -1,8 +1,7 @@ -/* Adapted from toybox's patch. */ - /* vi: set sw=4 ts=4: * - * patch.c - Apply a "universal" diff. + * Apply a "universal" diff. + * Adapted from toybox's patch implementation. * * Copyright 2007 Rob Landley * @@ -20,29 +19,41 @@ * -f force (no questions asked) * -F fuzz (number, default 2) * [file] which file to patch + */ + +//applet:IF_PATCH(APPLET(patch, _BB_DIR_USR_BIN, _BB_SUID_DROP)) + +//kbuild:lib-$(CONFIG_PATCH) += patch.o + +//config:config PATCH +//config: bool "patch" +//config: default y +//config: help +//config: Apply a unified diff formatted patch. + +//usage:#define patch_trivial_usage +//usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]" +//usage:#define patch_full_usage "\n\n" +//usage: IF_LONG_OPTS( +//usage: " -p,--strip N Strip N leading components from file names" +//usage: "\n -i,--input DIFF Read DIFF instead of stdin" +//usage: "\n -R,--reverse Reverse patch" +//usage: "\n -N,--forward Ignore already applied patches" +//usage: "\n --dry-run Don't actually change files" +//usage: "\n -E,--remove-empty-files Remove output files if they become empty" +//usage: ) +//usage: IF_NOT_LONG_OPTS( +//usage: " -p N Strip N leading components from file names" +//usage: "\n -i DIFF Read DIFF instead of stdin" +//usage: "\n -R Reverse patch" +//usage: "\n -N Ignore already applied patches" +//usage: "\n -E Remove output files if they become empty" +//usage: ) +//usage: +//usage:#define patch_example_usage +//usage: "$ patch -p1 < example.diff\n" +//usage: "$ patch -p0 -i example.diff" -USE_PATCH(NEWTOY(patch, USE_TOYBOX_DEBUG("x")"up#i:R", TOYFLAG_USR|TOYFLAG_BIN)) - -config PATCH - bool "patch" - default y - help - usage: patch [-i file] [-p depth] [-Ru] - - Apply a unified diff to one or more files. - - -i Input file (defaults=stdin) - -p number of '/' to strip from start of file paths (default=all) - -R Reverse patch. - -u Ignored (only handles "unified" diffs) - - This version of patch only handles unified diffs, and only modifies - a file when all all hunks to that file apply. Patch prints failed - hunks to stderr, and exits with nonzero status if any hunks fail. - - A file compared against /dev/null (or with a date <= the epoch) is - created or deleted if -E or --remove-empty-files set. -*/ #include "libbb.h" struct double_list { @@ -101,125 +112,6 @@ struct double_list *dlist_add(struct double_list **list, char *data) return line; } -// Ensure entire path exists. -// If mode != -1 set permissions on newly created dirs. -// Requires that path string be writable (for temporary null terminators). -static -void xmkpath(char *path, int mode) -{ - char *p, old; - mode_t mask; - int rc; - struct stat st; - - for (p = path; ; p++) { - if (!*p || *p == '/') { - old = *p; - *p = rc = 0; - if (stat(path, &st) || !S_ISDIR(st.st_mode)) { - if (mode != -1) { - mask = umask(0); - rc = mkdir(path, mode); - umask(mask); - } else rc = mkdir(path, 0777); - } - *p = old; - if(rc) bb_perror_msg_and_die("mkpath '%s'", path); - } - if (!*p) break; - } -} - -// Slow, but small. -static -char *get_rawline(int fd, long *plen, char end) -{ - char c, *buf = NULL; - long len = 0; - - for (;;) { - if (1>read(fd, &c, 1)) break; - if (!(len & 63)) buf=xrealloc(buf, len+65); - if ((buf[len++]=c) == end) break; - } - if (buf) buf[len]=0; - if (plen) *plen = len; - - return buf; -} - -static -char *get_line(int fd) -{ - long len; - char *buf = get_rawline(fd, &len, '\n'); - - if (buf && buf[--len]=='\n') buf[len]=0; - - return buf; -} - -// Copy the rest of in to out and close both files. -static -void xsendfile(int in, int out) -{ - long len; - char buf[4096]; - - if (in<0) return; - for (;;) { - len = safe_read(in, buf, 4096); - if (len<1) break; - xwrite(out, buf, len); - } -} - -// Copy the rest of the data and replace the original with the copy. -static -void replace_tempfile(int fdin, int fdout, char **tempname) -{ - char *temp = xstrdup(*tempname); - - temp[strlen(temp)-6]=0; - if (fdin != -1) { - xsendfile(fdin, fdout); - xclose(fdin); - } - xclose(fdout); - rename(*tempname, temp); - free(*tempname); - free(temp); - *tempname = NULL; -} - -// Open a temporary file to copy an existing file into. -static -int copy_tempfile(int fdin, char *name, char **tempname) -{ - struct stat statbuf; - int fd; - - *tempname = xasprintf("%sXXXXXX", name); - fd = xmkstemp(*tempname); - - // Set permissions of output file - fstat(fdin, &statbuf); - fchmod(fd, statbuf.st_mode); - - return fd; -} - -// Abort the copy and delete the temporary file. -static -void delete_tempfile(int fdin, int fdout, char **tempname) -{ - close(fdin); - close(fdout); - unlink(*tempname); - free(*tempname); - *tempname = NULL; -} - struct globals { @@ -229,7 +121,7 @@ struct globals { struct double_list *current_hunk; long oldline, oldlen, newline, newlen; long linenum; - int context, state, filein, fileout, filepatch, hunknum; + int context, state, filein, fileout, hunknum; char *tempname; // was toys.foo: @@ -263,7 +155,7 @@ struct globals { static void do_line(void *data) { - struct double_list *dlist = (struct double_list *)data; + struct double_list *dlist = data; if (TT.state>1 && *dlist->data != TT.state) fdprintf(TT.state == 2 ? 2 : TT.fileout, @@ -272,19 +164,36 @@ static void do_line(void *data) if (PATCH_DEBUG) fdprintf(2, "DO %d: %s\n", TT.state, dlist->data); free(dlist->data); - free(data); + free(dlist); } static void finish_oldfile(void) { - if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname); + if (TT.tempname) { + // Copy the rest of the data and replace the original with the copy. + char *temp; + + if (TT.filein != -1) { + bb_copyfd_eof(TT.filein, TT.fileout); + xclose(TT.filein); + } + xclose(TT.fileout); + + temp = xstrdup(TT.tempname); + temp[strlen(temp) - 6] = '\0'; + rename(TT.tempname, temp); + free(temp); + + free(TT.tempname); + TT.tempname = NULL; + } TT.fileout = TT.filein = -1; } static void fail_hunk(void) { if (!TT.current_hunk) return; - TT.current_hunk->prev->next = 0; + TT.current_hunk->prev->next = NULL; fdprintf(2, "Hunk %d FAILED %ld/%ld.\n", TT.hunknum, TT.oldline, TT.newline); TT.exitval = 1; @@ -295,7 +204,14 @@ static void fail_hunk(void) TT.state = 2; llist_free(TT.current_hunk, do_line); TT.current_hunk = NULL; - delete_tempfile(TT.filein, TT.fileout, &TT.tempname); + + // Abort the copy and delete the temporary file. + close(TT.filein); + close(TT.fileout); + unlink(TT.tempname); + free(TT.tempname); + TT.tempname = NULL; + TT.state = 0; } @@ -334,7 +250,7 @@ static int apply_one_hunk(void) plist = TT.current_hunk; buf = NULL; if (TT.context) for (;;) { - char *data = get_line(TT.filein); + char *data = xmalloc_reads(TT.filein, NULL, NULL); TT.linenum++; @@ -368,7 +284,9 @@ static int apply_one_hunk(void) // File ended before we found a place for this hunk. fail_hunk(); goto done; - } else if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data); + } + + if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data); check = dlist_add(&buf, data); // Compare this line with next expected line of hunk. @@ -398,8 +316,8 @@ static int apply_one_hunk(void) // If we've reached the end of the buffer without confirming a // match, read more lines. - if (check==buf) { - buf = 0; + if (check == buf) { + buf = NULL; break; } check = buf; @@ -453,10 +371,10 @@ int patch_main(int argc UNUSED_PARAM, char **argv) TT.prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative! TT.filein = TT.fileout = -1; if (opts & FLAG_INPUT) { - TT.filepatch = xopen_stdin(opt_i); + xmove_fd(xopen_stdin(opt_i), STDIN_FILENO); } else { if (argv[0] && argv[1]) { - TT.filepatch = xopen_stdin(argv[1]); + xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO); } } if (argv[0]) { @@ -468,7 +386,7 @@ int patch_main(int argc UNUSED_PARAM, char **argv) for(;;) { char *patchline; - patchline = get_line(TT.filepatch); + patchline = xmalloc_fgetline(stdin); if (!patchline) break; // Other versions of patch accept damaged patches, @@ -588,13 +506,15 @@ int patch_main(int argc UNUSED_PARAM, char **argv) } // 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) { printf("creating %s\n", name); s = strrchr(name, '/'); if (s) { *s = 0; - xmkpath(name, -1); + bb_make_directory(name, -1, FILEUTILS_RECUR); *s = '/'; } TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR); @@ -602,7 +522,13 @@ int patch_main(int argc UNUSED_PARAM, char **argv) printf("patching file %s\n", name); TT.filein = xopen(name, O_RDONLY); } - TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname); + + 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); + TT.linenum = 0; TT.hunknum = 0; } @@ -620,7 +546,6 @@ int patch_main(int argc UNUSED_PARAM, char **argv) finish_oldfile(); if (ENABLE_FEATURE_CLEAN_UP) { - close(TT.filepatch); free(oldname); free(newname); } diff --git a/testsuite/patch.tests b/testsuite/patch.tests index e482304..ba37e82 100755 --- a/testsuite/patch.tests +++ b/testsuite/patch.tests @@ -75,7 +75,7 @@ zxc testing "patch detects already applied hunk" \ 'patch 2>&1; echo $?; cat input' \ "\ -Possibly reversed hunk 1 at 2 +Possibly reversed hunk 1 at 4 Hunk 1 FAILED 1/1. abc +def @@ -103,7 +103,7 @@ def testing "patch detects already applied hunk at the EOF" \ 'patch 2>&1; echo $?; cat input' \ "\ -Possibly reversed hunk 1 at 3 +Possibly reversed hunk 1 at 4 Hunk 1 FAILED 1/1. abc 123 -- 2.7.4