/*
* $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/inp.c,v 1.6 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: inp.c,v 1.26 2018/06/18 18:33:31 christos Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* Copyright 1986, Larry Wall
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following condition is met:
* 1. Redistributions of source code must retain the above copyright notice,
* this condition and the following disclaimer.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: inp.c,v 1.26 2018/06/18 18:33:31 christos Exp $");
#include <sys/types.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "util.h"
#include "pch.h"
#include "inp.h"
/* Input-file-with-indexable-lines abstract type */
static off_t i_size; /* size of the input file */
static char *i_womp; /* plan a buffer for entire file */
static char **i_ptr; /* pointers to lines in i_womp */
static char empty_line[] = { '\0' };
static int tifd = -1; /* plan b virtual string array */
static char *tibuf[2]; /* plan b buffers */
static LINENUM tiline[2] = {-1, -1}; /* 1st line in each buffer */
static LINENUM lines_per_buf; /* how many lines per buffer */
static int tireclen; /* length of records in tmp file */
static bool rev_in_string(const char *);
static bool reallocate_lines(size_t *);
/* returns false if insufficient memory */
static bool plan_a(const char *);
static void plan_b(const char *);
/* New patch--prepare to edit another file. */
void
re_input(void)
{
if (using_plan_a) {
i_size = 0;
free(i_ptr);
i_ptr = NULL;
if (i_womp != NULL) {
munmap(i_womp, i_size);
i_womp = NULL;
}
} else {
using_plan_a = true; /* maybe the next one is smaller */
close(tifd);
tifd = -1;
free(tibuf[0]);
free(tibuf[1]);
tibuf[0] = tibuf[1] = NULL;
tiline[0] = tiline[1] = -1;
tireclen = 0;
}
}
/* Construct the line index, somehow or other. */
void
scan_input(const char *filename)
{
if (!plan_a(filename))
plan_b(filename);
if (verbose) {
say("Patching file %s using Plan %s...\n", filename,
(using_plan_a ? "A" : "B"));
}
}
static bool
reallocate_lines(size_t *lines_allocated)
{
char **p;
size_t new_size;
new_size = *lines_allocated * 3 / 2;
p = pch_realloc(i_ptr, new_size + 2, sizeof(char *));
if (p == NULL) { /* shucks, it was a near thing */
munmap(i_womp, i_size);
i_womp = NULL;
free(i_ptr);
i_ptr = NULL;
*lines_allocated = 0;
return false;
}
*lines_allocated = new_size;
i_ptr = p;
return true;
}
/* Try keeping everything in memory. */
static bool
plan_a(const char *filename)
{
int ifd, statfailed, devnull, pstat;
char *p, *s, lbuf[MAXLINELEN];
struct stat filestat;
off_t i;
ptrdiff_t sz;
size_t iline, lines_allocated;
pid_t pid;
char *argp[4] = {NULL};
#ifdef DEBUGGING
if (debug & 8)
return false;
#endif
if (filename == NULL || *filename == '\0')
return false;
statfailed = stat(filename, &filestat);
if (statfailed && ok_to_create_file) {
if (verbose)
say("(Creating file %s...)\n", filename);
/*
* in check_patch case, we still display `Creating file' even
* though we're not. The rule is that -C should be as similar
* to normal patch behavior as possible
*/
if (check_only)
return true;
makedirs(filename, true);
close(creat(filename, 0666));
statfailed = stat(filename, &filestat);
}
if (statfailed && check_only)
fatal("%s not found, -C mode, can't probe further\n", filename);
/* For nonexistent or read-only files, look for RCS versions. */
if (statfailed ||
/* No one can write to it. */
(filestat.st_mode & 0222) == 0 ||
/* I can't write to it. */
((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
char *filebase, *filedir;
struct stat cstat;
char *tmp_filename1, *tmp_filename2;
tmp_filename1 = strdup(filename);
tmp_filename2 = strdup(filename);
if (tmp_filename1 == NULL || tmp_filename2 == NULL)
fatal("strdupping filename");
filebase = basename(tmp_filename1);
filedir = dirname(tmp_filename2);
#define try(f, a1, a2, a3) \
(snprintf(lbuf, sizeof lbuf, f, a1, a2, a3), stat(lbuf, &cstat) == 0)
/*
* else we can't write to it but it's not under a version
* control system, so just proceed.
*/
if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
try("%s/RCS/%s%s", filedir, filebase, "") ||
try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
if (!statfailed) {
if ((filestat.st_mode & 0222) != 0)
/* The owner can write to it. */
fatal("file %s seems to be locked "
"by somebody else under RCS\n",
filename);
/*
* It might be checked out unlocked. See if
* it's safe to check out the default version
* locked.
*/
if (verbose)
say("Comparing file %s to default "
"RCS version...\n", filename);
switch (pid = fork()) {
case -1:
fatal("can't fork: %s\n",
strerror(errno));
case 0:
devnull = open("/dev/null", O_RDONLY);
if (devnull == -1) {
fatal("can't open /dev/null: %s",
strerror(errno));
}
(void)dup2(devnull, STDOUT_FILENO);
argp[0] = __UNCONST(RCSDIFF);
argp[1] = __UNCONST(filename);
execv(RCSDIFF, argp);
exit(127);
}
pid = waitpid(pid, &pstat, 0);
if (pid == -1 || WEXITSTATUS(pstat) != 0) {
fatal("can't check out file %s: "
"differs from default RCS version\n",
filename);
}
}
if (verbose)
say("Checking out file %s from RCS...\n",
filename);
switch (pid = fork()) {
case -1:
fatal("can't fork: %s\n", strerror(errno));
case 0:
argp[0] = __UNCONST(CHECKOUT);
argp[1] = __UNCONST("-l");
argp[2] = __UNCONST(filename);
execv(CHECKOUT, argp);
exit(127);
}
pid = waitpid(pid, &pstat, 0);
if (pid == -1 || WEXITSTATUS(pstat) != 0 ||
stat(filename, &filestat)) {
fatal("can't check out file %s from RCS\n",
filename);
}
} else if (statfailed) {
fatal("can't find %s\n", filename);
}
free(tmp_filename1);
free(tmp_filename2);
}
filemode = filestat.st_mode;
if (!S_ISREG(filemode))
fatal("%s is not a normal file--can't patch\n", filename);
i_size = filestat.st_size;
if (out_of_mem) {
set_hunkmax(); /* make sure dynamic arrays are allocated */
out_of_mem = false;
return false; /* force plan b because plan a bombed */
}
if ((uintmax_t)i_size > (uintmax_t)SIZE_MAX) {
say("block too large to mmap\n");
return false;
}
if ((ifd = open(filename, O_RDONLY)) < 0)
pfatal("can't open file %s", filename);
if (i_size) {
i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
if (i_womp == MAP_FAILED) {
perror("mmap failed");
i_womp = NULL;
close(ifd);
return false;
}
} else {
i_womp = NULL;
}
close(ifd);
if (i_size)
madvise(i_womp, i_size, MADV_SEQUENTIAL);
/* estimate the number of lines */
lines_allocated = i_size / 25;
if (lines_allocated < 100)
lines_allocated = 100;
if (!reallocate_lines(&lines_allocated))
return false;
/* now scan the buffer and build pointer array */
iline = 1;
i_ptr[iline] = i_womp;
/* test for NUL too, to maintain the behavior of the original code */
for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
if (*s == '\n') {
if (iline == lines_allocated) {
if (!reallocate_lines(&lines_allocated))
return false;
}
/* these are NOT NUL terminated */
i_ptr[++iline] = s + 1;
}
}
/* if the last line contains no EOL, append one */
if (i_size > 0 && i_womp[i_size - 1] != '\n') {
last_line_missing_eol = true;
/* fix last line */
sz = s - i_ptr[iline];
p = malloc(sz + 1);
if (p == NULL) {
free(i_ptr);
i_ptr = NULL;
munmap(i_womp, i_size);
i_womp = NULL;
return false;
}
memcpy(p, i_ptr[iline], sz);
p[sz] = '\n';
i_ptr[iline] = p;
/* count the extra line and make it point to some valid mem */
i_ptr[++iline] = empty_line;
} else
last_line_missing_eol = false;
input_lines = iline - 1;
/* now check for revision, if any */
if (revision != NULL) {
if (!rev_in_string(i_womp)) {
if (force) {
if (verbose)
say("Warning: this file doesn't appear "
"to be the %s version--patching anyway.\n",
revision);
} else if (batch) {
fatal("this file doesn't appear to be the "
"%s version--aborting.\n",
revision);
} else {
ask("This file doesn't appear to be the "
"%s version--patch anyway? [n] ",
revision);
if (*buf != 'y')
fatal("aborted\n");
}
} else if (verbose)
say("Good. This file appears to be the %s version.\n",
revision);
}
return true; /* plan a will work */
}
/* Keep (virtually) nothing in memory. */
static void
plan_b(const char *filename)
{
FILE *ifp;
size_t i = 0, j, maxlen = 1;
char *p;
bool found_revision = (revision == NULL);
using_plan_a = false;
if ((ifp = fopen(filename, "r")) == NULL)
pfatal("can't open file %s", filename);
unlink(TMPINNAME);
if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
pfatal("can't open file %s", TMPINNAME);
while (fgets(buf, buf_len, ifp) != NULL) {
if (revision != NULL && !found_revision && rev_in_string(buf))
found_revision = true;
if ((i = strlen(buf)) > maxlen)
maxlen = i; /* find longest line */
}
last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
if (last_line_missing_eol && maxlen == i)
maxlen++;
if (revision != NULL) {
if (!found_revision) {
if (force) {
if (verbose)
say("Warning: this file doesn't appear "
"to be the %s version--patching anyway.\n",
revision);
} else if (batch) {
fatal("this file doesn't appear to be the "
"%s version--aborting.\n",
revision);
} else {
ask("This file doesn't appear to be the %s "
"version--patch anyway? [n] ",
revision);
if (*buf != 'y')
fatal("aborted\n");
}
} else if (verbose)
say("Good. This file appears to be the %s version.\n",
revision);
}
fseek(ifp, 0L, SEEK_SET); /* rewind file */
lines_per_buf = BUFFERSIZE / maxlen;
tireclen = maxlen;
tibuf[0] = malloc(BUFFERSIZE + 1);
if (tibuf[0] == NULL)
fatal("out of memory\n");
tibuf[1] = malloc(BUFFERSIZE + 1);
if (tibuf[1] == NULL)
fatal("out of memory\n");
for (i = 1;; i++) {
p = tibuf[0] + maxlen * (i % lines_per_buf);
if (i % lines_per_buf == 0) /* new block */
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal("can't write temp file");
if (fgets(p, maxlen + 1, ifp) == NULL) {
input_lines = i - 1;
if (i % lines_per_buf != 0)
if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
pfatal("can't write temp file");
break;
}
j = strlen(p);
/* These are '\n' terminated strings, so no need to add a NUL */
if (j == 0 || p[j - 1] != '\n')
p[j] = '\n';
}
fclose(ifp);
close(tifd);
if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
pfatal("can't reopen file %s", TMPINNAME);
}
/*
* Fetch a line from the input file, \n terminated, not necessarily \0.
*/
char *
ifetch(LINENUM line, int whichbuf)
{
if (line < 1 || line > input_lines) {
if (warn_on_invalid_line) {
say("No such line %ld in input file, ignoring\n", line);
warn_on_invalid_line = false;
}
return NULL;
}
if (using_plan_a)
return i_ptr[line];
else {
LINENUM offline = line % lines_per_buf;
LINENUM baseline = line - offline;
if (tiline[0] == baseline)
whichbuf = 0;
else if (tiline[1] == baseline)
whichbuf = 1;
else {
tiline[whichbuf] = baseline;
if (lseek(tifd, (off_t) (baseline / lines_per_buf *
BUFFERSIZE), SEEK_SET) < 0)
pfatal("cannot seek in the temporary input file");
if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
pfatal("error reading tmp file %s", TMPINNAME);
}
return tibuf[whichbuf] + (tireclen * offline);
}
}
/*
* True if the string argument contains the revision number we want.
*/
static bool
rev_in_string(const char *string)
{
const char *s;
size_t patlen;
if (revision == NULL)
return true;
patlen = strlen(revision);
if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
return true;
for (s = string; *s; s++) {
if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
isspace((unsigned char)s[patlen + 1])) {
return true;
}
}
return false;
}
