503 lines
13 KiB
C
503 lines
13 KiB
C
/*-
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* Copyright 1986, Larry Wall
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following condition is met:
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* 1. Redistributions of source code must retain the above copyright notice,
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* this condition and the following disclaimer.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* patch - a program to apply diffs to original files
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*
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* -C option added in 1998, original code by Marc Espie, based on FreeBSD
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* behaviour
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*
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* $OpenBSD: inp.c,v 1.36 2012/04/10 14:46:34 ajacoutot Exp $
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <ctype.h>
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#include <libgen.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "common.h"
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#include "util.h"
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#include "pch.h"
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#include "inp.h"
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/* Input-file-with-indexable-lines abstract type */
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static size_t i_size; /* size of the input file */
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static char *i_womp; /* plan a buffer for entire file */
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static char **i_ptr; /* pointers to lines in i_womp */
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static char empty_line[] = { '\0' };
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static int tifd = -1; /* plan b virtual string array */
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static char *tibuf[2]; /* plan b buffers */
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static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
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static size_t lines_per_buf; /* how many lines per buffer */
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static size_t tibuflen; /* plan b buffer length */
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static size_t tireclen; /* length of records in tmp file */
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static bool rev_in_string(const char *);
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static bool reallocate_lines(size_t *);
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/* returns false if insufficient memory */
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static bool plan_a(const char *);
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static void plan_b(const char *);
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/* New patch--prepare to edit another file. */
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void
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re_input(void)
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{
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if (using_plan_a) {
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free(i_ptr);
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i_ptr = NULL;
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if (i_womp != NULL) {
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munmap(i_womp, i_size);
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i_womp = NULL;
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}
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i_size = 0;
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} else {
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using_plan_a = true; /* maybe the next one is smaller */
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close(tifd);
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tifd = -1;
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free(tibuf[0]);
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free(tibuf[1]);
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tibuf[0] = tibuf[1] = NULL;
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tiline[0] = tiline[1] = -1;
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tireclen = 0;
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}
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}
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/* Construct the line index, somehow or other. */
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void
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scan_input(const char *filename)
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{
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if (!plan_a(filename))
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plan_b(filename);
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if (verbose) {
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say("Patching file %s using Plan %s...\n", filename,
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(using_plan_a ? "A" : "B"));
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}
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}
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static bool
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reallocate_lines(size_t *lines_allocated)
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{
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char **p;
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size_t new_size;
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new_size = *lines_allocated * 3 / 2;
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p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
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if (p == NULL) { /* shucks, it was a near thing */
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munmap(i_womp, i_size);
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i_womp = NULL;
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free(i_ptr);
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i_ptr = NULL;
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*lines_allocated = 0;
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return false;
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}
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*lines_allocated = new_size;
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i_ptr = p;
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return true;
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}
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/* Try keeping everything in memory. */
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static bool
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plan_a(const char *filename)
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{
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int ifd, statfailed;
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char *p, *s, lbuf[INITLINELEN];
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struct stat filestat;
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ptrdiff_t sz;
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size_t i;
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size_t iline, lines_allocated;
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#ifdef DEBUGGING
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if (debug & 8)
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return false;
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#endif
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if (filename == NULL || *filename == '\0')
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return false;
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statfailed = stat(filename, &filestat);
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if (statfailed && ok_to_create_file) {
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if (verbose)
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say("(Creating file %s...)\n", filename);
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/*
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* in check_patch case, we still display `Creating file' even
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* though we're not. The rule is that -C should be as similar
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* to normal patch behavior as possible
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*/
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if (check_only)
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return true;
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makedirs(filename, true);
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close(creat(filename, 0666));
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statfailed = stat(filename, &filestat);
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}
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if (statfailed && check_only)
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fatal("%s not found, -C mode, can't probe further\n", filename);
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/* For nonexistent or read-only files, look for RCS or SCCS versions. */
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if (statfailed ||
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/* No one can write to it. */
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(filestat.st_mode & 0222) == 0 ||
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/* I can't write to it. */
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((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
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const char *cs = NULL, *filebase, *filedir;
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struct stat cstat;
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char *tmp_filename1, *tmp_filename2;
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tmp_filename1 = strdup(filename);
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tmp_filename2 = strdup(filename);
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if (tmp_filename1 == NULL || tmp_filename2 == NULL)
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fatal("strdupping filename");
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filebase = basename(tmp_filename1);
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filedir = dirname(tmp_filename2);
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/* Leave room in lbuf for the diff command. */
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s = lbuf + 20;
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#define try(f, a1, a2, a3) \
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(snprintf(s, buf_size - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
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if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
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try("%s/RCS/%s%s", filedir, filebase, "") ||
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try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
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snprintf(buf, buf_size, CHECKOUT, filename);
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snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
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cs = "RCS";
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} else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
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try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
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snprintf(buf, buf_size, GET, s);
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snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
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cs = "SCCS";
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} else if (statfailed)
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fatal("can't find %s\n", filename);
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free(tmp_filename1);
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free(tmp_filename2);
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/*
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* else we can't write to it but it's not under a version
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* control system, so just proceed.
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*/
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if (cs) {
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if (!statfailed) {
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if ((filestat.st_mode & 0222) != 0)
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/* The owner can write to it. */
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fatal("file %s seems to be locked "
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"by somebody else under %s\n",
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filename, cs);
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/*
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* It might be checked out unlocked. See if
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* it's safe to check out the default version
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* locked.
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*/
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if (verbose)
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say("Comparing file %s to default "
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"%s version...\n",
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filename, cs);
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if (system(lbuf))
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fatal("can't check out file %s: "
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"differs from default %s version\n",
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filename, cs);
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}
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if (verbose)
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say("Checking out file %s from %s...\n",
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filename, cs);
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if (system(buf) || stat(filename, &filestat))
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fatal("can't check out file %s from %s\n",
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filename, cs);
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}
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}
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filemode = filestat.st_mode;
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if (!S_ISREG(filemode))
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fatal("%s is not a normal file--can't patch\n", filename);
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if ((uint64_t)filestat.st_size > SIZE_MAX) {
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say("block too large to mmap\n");
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return false;
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}
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i_size = (size_t)filestat.st_size;
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if (out_of_mem) {
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set_hunkmax(); /* make sure dynamic arrays are allocated */
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out_of_mem = false;
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return false; /* force plan b because plan a bombed */
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}
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if ((ifd = open(filename, O_RDONLY)) < 0)
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pfatal("can't open file %s", filename);
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if (i_size) {
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i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
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if (i_womp == MAP_FAILED) {
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perror("mmap failed");
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i_womp = NULL;
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close(ifd);
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return false;
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}
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} else {
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i_womp = NULL;
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}
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close(ifd);
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if (i_size)
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madvise(i_womp, i_size, MADV_SEQUENTIAL);
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/* estimate the number of lines */
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lines_allocated = i_size / 25;
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if (lines_allocated < 100)
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lines_allocated = 100;
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if (!reallocate_lines(&lines_allocated))
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return false;
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/* now scan the buffer and build pointer array */
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iline = 1;
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i_ptr[iline] = i_womp;
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/* test for NUL too, to maintain the behavior of the original code */
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for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
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if (*s == '\n') {
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if (iline == lines_allocated) {
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if (!reallocate_lines(&lines_allocated))
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return false;
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}
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/* these are NOT NUL terminated */
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i_ptr[++iline] = s + 1;
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}
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}
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/* if the last line contains no EOL, append one */
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if (i_size > 0 && i_womp[i_size - 1] != '\n') {
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last_line_missing_eol = true;
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/* fix last line */
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sz = s - i_ptr[iline];
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p = malloc(sz + 1);
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if (p == NULL) {
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free(i_ptr);
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i_ptr = NULL;
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munmap(i_womp, i_size);
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i_womp = NULL;
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return false;
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}
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memcpy(p, i_ptr[iline], sz);
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p[sz] = '\n';
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i_ptr[iline] = p;
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/* count the extra line and make it point to some valid mem */
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i_ptr[++iline] = empty_line;
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} else
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last_line_missing_eol = false;
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input_lines = iline - 1;
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/* now check for revision, if any */
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if (revision != NULL) {
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if (i_womp == NULL || !rev_in_string(i_womp)) {
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if (force) {
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if (verbose)
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say("Warning: this file doesn't appear "
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"to be the %s version--patching anyway.\n",
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revision);
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} else if (batch) {
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fatal("this file doesn't appear to be the "
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"%s version--aborting.\n",
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revision);
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} else {
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ask("This file doesn't appear to be the "
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"%s version--patch anyway? [n] ",
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revision);
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if (*buf != 'y')
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fatal("aborted\n");
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}
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} else if (verbose)
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say("Good. This file appears to be the %s version.\n",
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revision);
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}
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return true; /* plan a will work */
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}
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/* Keep (virtually) nothing in memory. */
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static void
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plan_b(const char *filename)
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{
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FILE *ifp;
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size_t i = 0, j, len, maxlen = 1;
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char *lbuf = NULL, *p;
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bool found_revision = (revision == NULL);
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using_plan_a = false;
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if ((ifp = fopen(filename, "r")) == NULL)
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pfatal("can't open file %s", filename);
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unlink(TMPINNAME);
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if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
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pfatal("can't open file %s", TMPINNAME);
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while ((p = fgetln(ifp, &len)) != NULL) {
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if (p[len - 1] == '\n')
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p[len - 1] = '\0';
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else {
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/* EOF without EOL, copy and add the NUL */
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if ((lbuf = malloc(len + 1)) == NULL)
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fatal("out of memory\n");
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memcpy(lbuf, p, len);
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lbuf[len] = '\0';
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p = lbuf;
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last_line_missing_eol = true;
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len++;
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}
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if (revision != NULL && !found_revision && rev_in_string(p))
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found_revision = true;
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if (len > maxlen)
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maxlen = len; /* find longest line */
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}
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free(lbuf);
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if (ferror(ifp))
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pfatal("can't read file %s", filename);
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if (revision != NULL) {
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if (!found_revision) {
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if (force) {
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if (verbose)
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say("Warning: this file doesn't appear "
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"to be the %s version--patching anyway.\n",
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revision);
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} else if (batch) {
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fatal("this file doesn't appear to be the "
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"%s version--aborting.\n",
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revision);
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} else {
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ask("This file doesn't appear to be the %s "
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"version--patch anyway? [n] ",
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revision);
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if (*buf != 'y')
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fatal("aborted\n");
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}
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} else if (verbose)
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say("Good. This file appears to be the %s version.\n",
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revision);
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}
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fseek(ifp, 0L, SEEK_SET); /* rewind file */
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tireclen = maxlen;
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tibuflen = maxlen > BUFFERSIZE ? maxlen : BUFFERSIZE;
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lines_per_buf = tibuflen / maxlen;
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tibuf[0] = malloc(tibuflen + 1);
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if (tibuf[0] == NULL)
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fatal("out of memory\n");
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tibuf[1] = malloc(tibuflen + 1);
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if (tibuf[1] == NULL)
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fatal("out of memory\n");
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for (i = 1;; i++) {
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p = tibuf[0] + maxlen * (i % lines_per_buf);
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if (i % lines_per_buf == 0) /* new block */
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if (write(tifd, tibuf[0], tibuflen) !=
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(ssize_t) tibuflen)
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pfatal("can't write temp file");
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if (fgets(p, maxlen + 1, ifp) == NULL) {
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input_lines = i - 1;
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if (i % lines_per_buf != 0)
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if (write(tifd, tibuf[0], tibuflen) !=
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(ssize_t) tibuflen)
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pfatal("can't write temp file");
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break;
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}
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j = strlen(p);
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/* These are '\n' terminated strings, so no need to add a NUL */
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if (j == 0 || p[j - 1] != '\n')
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p[j] = '\n';
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}
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fclose(ifp);
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close(tifd);
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if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
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pfatal("can't reopen file %s", TMPINNAME);
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}
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/*
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* Fetch a line from the input file, \n terminated, not necessarily \0.
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*/
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char *
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ifetch(LINENUM line, int whichbuf)
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{
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if (line < 1 || line > input_lines) {
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if (warn_on_invalid_line) {
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say("No such line %ld in input file, ignoring\n", line);
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warn_on_invalid_line = false;
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}
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return NULL;
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}
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if (using_plan_a)
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return i_ptr[line];
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else {
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LINENUM offline = line % lines_per_buf;
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LINENUM baseline = line - offline;
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if (tiline[0] == baseline)
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whichbuf = 0;
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else if (tiline[1] == baseline)
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whichbuf = 1;
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else {
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tiline[whichbuf] = baseline;
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if (lseek(tifd, (off_t) (baseline / lines_per_buf *
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tibuflen), SEEK_SET) < 0)
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pfatal("cannot seek in the temporary input file");
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if (read(tifd, tibuf[whichbuf], tibuflen) !=
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(ssize_t) tibuflen)
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pfatal("error reading tmp file %s", TMPINNAME);
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}
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return tibuf[whichbuf] + (tireclen * offline);
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}
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}
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/*
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* True if the string argument contains the revision number we want.
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*/
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static bool
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rev_in_string(const char *string)
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{
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const char *s;
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size_t patlen;
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if (revision == NULL)
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return true;
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patlen = strlen(revision);
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if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
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return true;
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for (s = string; *s; s++) {
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if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
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isspace((unsigned char)s[patlen + 1])) {
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return true;
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}
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}
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return false;
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}
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