280 lines
7.1 KiB
C
280 lines
7.1 KiB
C
/* $NetBSD: inp.c,v 1.18 2006/04/09 19:06:34 christos Exp $ */
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/*
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* Copyright (c) 1988, 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
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* is met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, 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
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER 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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: inp.c,v 1.18 2006/04/09 19:06:34 christos Exp $");
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#endif /* not lint */
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#include "EXTERN.h"
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#include "backupfile.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 "INTERN.h"
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#include "inp.h"
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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static void plan_a(char *);
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static bool rev_in_string(char *);
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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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/*
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* New patch -- prepare to edit another file.
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*/
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void
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re_input(void)
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{
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i_size = 0;
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if (i_ptr != NULL)
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free(i_ptr);
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if (i_womp != NULL)
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free(i_womp);
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i_womp = NULL;
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i_ptr = NULL;
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}
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/*
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* Construct the line index, somehow or other.
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*/
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void
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scan_input(char *filename)
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{
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plan_a(filename);
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if (verbose)
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say("Patching file %s using Plan A...\n", filename);
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}
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/*
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* Try keeping everything in memory.
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*/
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static void
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plan_a(char *filename)
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{
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int ifd, statfailed;
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char *s;
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LINENUM iline;
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char lbuf[MAXLINELEN];
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statfailed = stat(filename, &filestat);
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if (statfailed && ok_to_create_file) {
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int fd;
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if (verbose)
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say("(Creating file %s...)\n",filename);
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makedirs(filename, TRUE);
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if ((fd = open(filename, O_CREAT|O_TRUNC, 0666)) == -1)
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pfatal("can't open file %s", filename);
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statfailed = fstat(fd, &filestat);
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(void)close(fd);
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}
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/*
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* For nonexistent or read-only files, look for RCS or SCCS
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* versions.
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*/
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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 != myuid)) {
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struct stat cstat;
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const char *cs = NULL;
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char *filebase;
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size_t pathlen;
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filebase = basename(filename);
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pathlen = filebase - filename;
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/*
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* Put any leading path into `s'.
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* Leave room in lbuf for the diff command.
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*/
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s = lbuf + 20;
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if (pathlen >= sizeof(lbuf) - 20)
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fatal("file name too long\n");
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strncpy(s, filename, pathlen);
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s[pathlen] = '\0';
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#define try(f, a1, a2) (snprintf(s + pathlen, sizeof(lbuf) - (s + pathlen - lbuf), f, a1, a2), stat(s, &cstat) == 0)
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#define try1(f, a1) (snprintf(s + pathlen, sizeof(lbuf) - (s + pathlen - lbuf), f, a1), stat(s, &cstat) == 0)
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if (try("RCS/%s%s", filebase, RCSSUFFIX) ||
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try1("RCS/%s" , filebase) ||
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try("%s%s", filebase, RCSSUFFIX)) {
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snprintf(buf, sizeof(buf), 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("SCCS/%s%s", SCCSPREFIX, filebase) ||
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try("%s%s", SCCSPREFIX, filebase)) {
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snprintf(buf, sizeof(buf), 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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/*
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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(
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"file %s seems to be locked 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(
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"Comparing file %s to default %s version...\n",
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filename, cs);
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if (system(lbuf))
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fatal(
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"can't check out file %s: 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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if (old_file_is_dev_null &&
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ok_to_create_file &&
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(filestat.st_size != 0)) {
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fatal(
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"patch creates new file but existing file %s not empty\n",
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filename);
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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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i_size = filestat.st_size;
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i_womp = xmalloc(i_size + 2);
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if ((ifd = open(filename, 0)) < 0)
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pfatal("can't open file %s", filename);
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if (read(ifd, i_womp, i_size) != i_size)
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pfatal("read error");
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Close(ifd);
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if (i_size && i_womp[i_size - 1] != '\n')
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i_womp[i_size++] = '\n';
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i_womp[i_size] = '\0';
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/*
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* Count the lines in the buffer so we know how many pointers we
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* need.
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*/
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iline = 0;
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for (s = i_womp; *s; s++) {
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if (*s == '\n')
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iline++;
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}
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i_ptr = xmalloc((iline + 2) * sizeof(char *));
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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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for (s = i_womp; *s; s++) {
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if (*s == '\n') {
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/* These are NOT null terminated. */
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i_ptr[++iline] = s + 1;
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}
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}
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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 (!rev_in_string(i_womp)) {
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if (force) {
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if (verbose)
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say(
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"Warning: this file doesn't appear 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(
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"this file doesn't appear to be the %s version--aborting.\n", revision);
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} else {
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ask(
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"This file doesn't appear to be the %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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}
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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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const char *
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ifetch(LINENUM line)
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{
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if (line < 1 || line > input_lines)
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return "";
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return i_ptr[line];
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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(char *string)
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{
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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) &&
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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) &&
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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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