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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 <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
f718e3a0db
commit
b82ae98ea4
237
editors/patch.c
237
editors/patch.c
@ -1,8 +1,7 @@
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/* Adapted from toybox's patch. */
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/* vi: set sw=4 ts=4:
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*
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* patch.c - Apply a "universal" diff.
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* Apply a "universal" diff.
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* Adapted from toybox's patch implementation.
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*
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* Copyright 2007 Rob Landley <rob@landley.net>
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*
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@ -20,29 +19,41 @@
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* -f force (no questions asked)
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* -F fuzz (number, default 2)
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* [file] which file to patch
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*/
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USE_PATCH(NEWTOY(patch, USE_TOYBOX_DEBUG("x")"up#i:R", TOYFLAG_USR|TOYFLAG_BIN))
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//applet:IF_PATCH(APPLET(patch, _BB_DIR_USR_BIN, _BB_SUID_DROP))
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config PATCH
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bool "patch"
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default y
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help
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usage: patch [-i file] [-p depth] [-Ru]
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//kbuild:lib-$(CONFIG_PATCH) += patch.o
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Apply a unified diff to one or more files.
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//config:config PATCH
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//config: bool "patch"
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//config: default y
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//config: help
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//config: Apply a unified diff formatted patch.
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-i Input file (defaults=stdin)
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-p number of '/' to strip from start of file paths (default=all)
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-R Reverse patch.
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-u Ignored (only handles "unified" diffs)
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//usage:#define patch_trivial_usage
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//usage: "[OPTIONS] [ORIGFILE [PATCHFILE]]"
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//usage:#define patch_full_usage "\n\n"
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//usage: IF_LONG_OPTS(
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//usage: " -p,--strip N Strip N leading components from file names"
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//usage: "\n -i,--input DIFF Read DIFF instead of stdin"
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//usage: "\n -R,--reverse Reverse patch"
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//usage: "\n -N,--forward Ignore already applied patches"
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//usage: "\n --dry-run Don't actually change files"
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//usage: "\n -E,--remove-empty-files Remove output files if they become empty"
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//usage: )
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//usage: IF_NOT_LONG_OPTS(
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//usage: " -p N Strip N leading components from file names"
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//usage: "\n -i DIFF Read DIFF instead of stdin"
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//usage: "\n -R Reverse patch"
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//usage: "\n -N Ignore already applied patches"
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//usage: "\n -E Remove output files if they become empty"
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//usage: )
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//usage:
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//usage:#define patch_example_usage
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//usage: "$ patch -p1 < example.diff\n"
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//usage: "$ patch -p0 -i example.diff"
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This version of patch only handles unified diffs, and only modifies
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a file when all all hunks to that file apply. Patch prints failed
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hunks to stderr, and exits with nonzero status if any hunks fail.
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A file compared against /dev/null (or with a date <= the epoch) is
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created or deleted if -E or --remove-empty-files set.
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*/
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#include "libbb.h"
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struct double_list {
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@ -101,125 +112,6 @@ struct double_list *dlist_add(struct double_list **list, char *data)
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return line;
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}
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// Ensure entire path exists.
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// If mode != -1 set permissions on newly created dirs.
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// Requires that path string be writable (for temporary null terminators).
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static
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void xmkpath(char *path, int mode)
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{
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char *p, old;
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mode_t mask;
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int rc;
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struct stat st;
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for (p = path; ; p++) {
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if (!*p || *p == '/') {
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old = *p;
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*p = rc = 0;
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if (stat(path, &st) || !S_ISDIR(st.st_mode)) {
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if (mode != -1) {
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mask = umask(0);
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rc = mkdir(path, mode);
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umask(mask);
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} else rc = mkdir(path, 0777);
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}
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*p = old;
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if(rc) bb_perror_msg_and_die("mkpath '%s'", path);
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}
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if (!*p) break;
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}
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}
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// Slow, but small.
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static
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char *get_rawline(int fd, long *plen, char end)
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{
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char c, *buf = NULL;
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long len = 0;
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for (;;) {
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if (1>read(fd, &c, 1)) break;
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if (!(len & 63)) buf=xrealloc(buf, len+65);
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if ((buf[len++]=c) == end) break;
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}
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if (buf) buf[len]=0;
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if (plen) *plen = len;
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return buf;
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}
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static
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char *get_line(int fd)
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{
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long len;
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char *buf = get_rawline(fd, &len, '\n');
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if (buf && buf[--len]=='\n') buf[len]=0;
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return buf;
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}
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// Copy the rest of in to out and close both files.
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static
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void xsendfile(int in, int out)
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{
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long len;
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char buf[4096];
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if (in<0) return;
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for (;;) {
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len = safe_read(in, buf, 4096);
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if (len<1) break;
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xwrite(out, buf, len);
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}
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}
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// Copy the rest of the data and replace the original with the copy.
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static
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void replace_tempfile(int fdin, int fdout, char **tempname)
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{
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char *temp = xstrdup(*tempname);
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temp[strlen(temp)-6]=0;
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if (fdin != -1) {
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xsendfile(fdin, fdout);
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xclose(fdin);
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}
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xclose(fdout);
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rename(*tempname, temp);
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free(*tempname);
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free(temp);
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*tempname = NULL;
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}
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// Open a temporary file to copy an existing file into.
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static
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int copy_tempfile(int fdin, char *name, char **tempname)
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{
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struct stat statbuf;
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int fd;
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*tempname = xasprintf("%sXXXXXX", name);
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fd = xmkstemp(*tempname);
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// Set permissions of output file
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fstat(fdin, &statbuf);
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fchmod(fd, statbuf.st_mode);
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return fd;
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}
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// Abort the copy and delete the temporary file.
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static
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void delete_tempfile(int fdin, int fdout, char **tempname)
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{
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close(fdin);
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close(fdout);
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unlink(*tempname);
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free(*tempname);
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*tempname = NULL;
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}
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struct globals {
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@ -229,7 +121,7 @@ struct globals {
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struct double_list *current_hunk;
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long oldline, oldlen, newline, newlen;
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long linenum;
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int context, state, filein, fileout, filepatch, hunknum;
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int context, state, filein, fileout, hunknum;
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char *tempname;
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// was toys.foo:
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@ -263,7 +155,7 @@ struct globals {
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static void do_line(void *data)
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{
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struct double_list *dlist = (struct double_list *)data;
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struct double_list *dlist = data;
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if (TT.state>1 && *dlist->data != TT.state)
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fdprintf(TT.state == 2 ? 2 : TT.fileout,
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@ -272,19 +164,36 @@ static void do_line(void *data)
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if (PATCH_DEBUG) fdprintf(2, "DO %d: %s\n", TT.state, dlist->data);
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free(dlist->data);
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free(data);
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free(dlist);
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}
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static void finish_oldfile(void)
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{
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if (TT.tempname) replace_tempfile(TT.filein, TT.fileout, &TT.tempname);
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if (TT.tempname) {
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// Copy the rest of the data and replace the original with the copy.
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char *temp;
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if (TT.filein != -1) {
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bb_copyfd_eof(TT.filein, TT.fileout);
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xclose(TT.filein);
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}
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xclose(TT.fileout);
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temp = xstrdup(TT.tempname);
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temp[strlen(temp) - 6] = '\0';
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rename(TT.tempname, temp);
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free(temp);
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free(TT.tempname);
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TT.tempname = NULL;
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}
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TT.fileout = TT.filein = -1;
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}
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static void fail_hunk(void)
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{
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if (!TT.current_hunk) return;
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TT.current_hunk->prev->next = 0;
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TT.current_hunk->prev->next = NULL;
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fdprintf(2, "Hunk %d FAILED %ld/%ld.\n", TT.hunknum, TT.oldline, TT.newline);
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TT.exitval = 1;
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@ -295,7 +204,14 @@ static void fail_hunk(void)
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TT.state = 2;
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llist_free(TT.current_hunk, do_line);
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TT.current_hunk = NULL;
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delete_tempfile(TT.filein, TT.fileout, &TT.tempname);
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// Abort the copy and delete the temporary file.
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close(TT.filein);
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close(TT.fileout);
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unlink(TT.tempname);
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free(TT.tempname);
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TT.tempname = NULL;
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TT.state = 0;
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}
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@ -334,7 +250,7 @@ static int apply_one_hunk(void)
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plist = TT.current_hunk;
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buf = NULL;
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if (TT.context) for (;;) {
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char *data = get_line(TT.filein);
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char *data = xmalloc_reads(TT.filein, NULL, NULL);
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TT.linenum++;
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@ -368,7 +284,9 @@ static int apply_one_hunk(void)
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// File ended before we found a place for this hunk.
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fail_hunk();
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goto done;
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} else if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data);
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}
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if (PATCH_DEBUG) fdprintf(2, "IN: %s\n", data);
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check = dlist_add(&buf, data);
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// Compare this line with next expected line of hunk.
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@ -398,8 +316,8 @@ static int apply_one_hunk(void)
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// If we've reached the end of the buffer without confirming a
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// match, read more lines.
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if (check==buf) {
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buf = 0;
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if (check == buf) {
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buf = NULL;
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break;
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}
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check = buf;
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@ -453,10 +371,10 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
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TT.prefix = (opts & FLAG_PATHLEN) ? xatoi(opt_p) : 0; // can be negative!
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TT.filein = TT.fileout = -1;
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if (opts & FLAG_INPUT) {
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TT.filepatch = xopen_stdin(opt_i);
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xmove_fd(xopen_stdin(opt_i), STDIN_FILENO);
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} else {
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if (argv[0] && argv[1]) {
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TT.filepatch = xopen_stdin(argv[1]);
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xmove_fd(xopen_stdin(argv[1]), STDIN_FILENO);
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}
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}
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if (argv[0]) {
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@ -468,7 +386,7 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
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for(;;) {
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char *patchline;
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patchline = get_line(TT.filepatch);
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patchline = xmalloc_fgetline(stdin);
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if (!patchline) break;
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// Other versions of patch accept damaged patches,
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@ -588,13 +506,15 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
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}
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// If we've got a file to open, do so.
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} else if (!(option_mask32 & FLAG_PATHLEN) || i <= TT.prefix) {
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struct stat statbuf;
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// If the old file was null, we're creating a new one.
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if (!strcmp(oldname, "/dev/null") || !oldsum) {
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printf("creating %s\n", name);
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s = strrchr(name, '/');
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if (s) {
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*s = 0;
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xmkpath(name, -1);
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bb_make_directory(name, -1, FILEUTILS_RECUR);
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*s = '/';
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}
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TT.filein = xopen(name, O_CREAT|O_EXCL|O_RDWR);
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@ -602,7 +522,13 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
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printf("patching file %s\n", name);
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TT.filein = xopen(name, O_RDONLY);
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}
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TT.fileout = copy_tempfile(TT.filein, name, &TT.tempname);
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TT.tempname = xasprintf("%sXXXXXX", name);
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TT.fileout = xmkstemp(TT.tempname);
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// Set permissions of output file
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fstat(TT.filein, &statbuf);
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fchmod(TT.fileout, statbuf.st_mode);
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TT.linenum = 0;
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TT.hunknum = 0;
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}
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@ -620,7 +546,6 @@ int patch_main(int argc UNUSED_PARAM, char **argv)
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finish_oldfile();
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(TT.filepatch);
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free(oldname);
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free(newname);
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}
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@ -75,7 +75,7 @@ zxc
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testing "patch detects already applied hunk" \
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'patch 2>&1; echo $?; cat input' \
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"\
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Possibly reversed hunk 1 at 2
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Possibly reversed hunk 1 at 4
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Hunk 1 FAILED 1/1.
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abc
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+def
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@ -103,7 +103,7 @@ def
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testing "patch detects already applied hunk at the EOF" \
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'patch 2>&1; echo $?; cat input' \
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"\
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Possibly reversed hunk 1 at 3
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Possibly reversed hunk 1 at 4
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Hunk 1 FAILED 1/1.
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abc
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123
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