484 lines
10 KiB
C
484 lines
10 KiB
C
/* $NetBSD: util.c,v 1.20 2004/10/30 21:52:09 dsl 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: util.c,v 1.20 2004/10/30 21:52:09 dsl Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include "EXTERN.h"
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#include "common.h"
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#include "INTERN.h"
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#include "util.h"
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#include "backupfile.h"
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#include <stdarg.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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/*
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* Rename a file, copying it if necessary.
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*/
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int
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move_file(char *from, char *to)
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{
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char bakname[MAXPATHLEN];
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char *s;
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size_t i;
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int fromfd;
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/* to stdout? */
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if (strEQ(to, "-")) {
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#ifdef DEBUGGING
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if (debug & 4)
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say("Moving %s to stdout.\n", from);
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#endif
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fromfd = open(from, 0);
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if (fromfd < 0)
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pfatal("internal error, can't reopen %s", from);
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while ((i = read(fromfd, buf, sizeof buf)) > 0)
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if (write(1, buf, i) != 1)
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pfatal("write failed");
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Close(fromfd);
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return 0;
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}
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if (origprae) {
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strlcpy(bakname, origprae, sizeof(bakname));
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strlcat(bakname, to, sizeof(bakname));
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} else {
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#ifndef NODIR
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char *backupname = find_backup_file_name(to);
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strlcpy(bakname, backupname, sizeof(bakname));
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free(backupname);
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#else /* NODIR */
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strlcpy(bakname, to, sizeof(bakname));
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strlcat(bakname, simple_backup_suffix, sizeof(bakname));
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#endif /* NODIR */
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}
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if (stat(to, &filestat) == 0) { /* output file exists */
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dev_t to_device = filestat.st_dev;
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ino_t to_inode = filestat.st_ino;
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char *simplename = bakname;
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for (s = bakname; *s; s++) {
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if (*s == '/')
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simplename = s + 1;
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}
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/*
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* Find a backup name that is not the same file.
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* Change the first lowercase char into uppercase;
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* if that isn't sufficient, chop off the first char
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* and try again.
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*/
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while (stat(bakname, &filestat) == 0 &&
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to_device == filestat.st_dev &&
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to_inode == filestat.st_ino) {
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/* Skip initial non-lowercase chars. */
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for (s = simplename;
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*s && *s == toupper((unsigned char)*s);
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s++)
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;
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if (*s)
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*s = toupper((unsigned char)*s);
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else
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strcpy(simplename, simplename + 1);
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}
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while (unlink(bakname) >= 0)
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; /* while() is for benefit of Eunice */
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#ifdef DEBUGGING
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if (debug & 4)
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say("Moving %s to %s.\n", to, bakname);
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#endif
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if (link(to, bakname) < 0) {
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/*
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* Maybe `to' is a symlink into a different file
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* system. Copying replaces the symlink with a file;
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* using rename would be better.
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*/
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int tofd;
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int bakfd;
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bakfd = creat(bakname, 0666);
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if (bakfd < 0) {
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say("Can't backup %s, output is in %s: %s\n",
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to, from, strerror(errno));
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return -1;
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}
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tofd = open(to, 0);
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if (tofd < 0)
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pfatal("internal error, can't open %s", to);
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while ((i = read(tofd, buf, sizeof buf)) > 0)
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if (write(bakfd, buf, i) != i)
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pfatal("write failed");
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Close(tofd);
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Close(bakfd);
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}
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while (unlink(to) >= 0) ;
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}
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#ifdef DEBUGGING
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if (debug & 4)
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say("Moving %s to %s.\n", from, to);
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#endif
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if (link(from, to) < 0) { /* different file system? */
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int tofd;
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tofd = creat(to, 0666);
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if (tofd < 0) {
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say("Can't create %s, output is in %s: %s\n",
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to, from, strerror(errno));
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return -1;
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}
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fromfd = open(from, 0);
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if (fromfd < 0)
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pfatal("internal error, can't reopen %s", from);
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while ((i = read(fromfd, buf, sizeof buf)) > 0)
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if (write(tofd, buf, i) != i)
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pfatal("write failed");
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Close(fromfd);
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Close(tofd);
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}
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Unlink(from);
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return 0;
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}
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/*
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* Copy a file.
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*/
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void
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copy_file(char *from, char *to)
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{
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int tofd;
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int fromfd;
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size_t i;
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tofd = creat(to, 0666);
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if (tofd < 0)
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pfatal("can't create %s", to);
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fromfd = open(from, 0);
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if (fromfd < 0)
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pfatal("internal error, can't reopen %s", from);
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while ((i = read(fromfd, buf, sizeof buf)) > 0)
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if (write(tofd, buf, i) != i)
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pfatal("write to %s failed", to);
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Close(fromfd);
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Close(tofd);
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}
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/*
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* malloc with result test.
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*/
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void *
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xmalloc(size_t size)
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{
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void *p;
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if ((p = malloc(size)) == NULL)
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fatal("out of memory\n");
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return p;
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}
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/*
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* realloc with result test.
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*/
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void *
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xrealloc(void *ptr, size_t size)
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{
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void *p;
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if ((p = realloc(ptr, size)) == NULL)
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fatal("out of memory\n");
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return p;
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}
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/*
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* strdup with result test.
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*/
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char *
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xstrdup(const char *s)
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{
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char *p;
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if ((p = strdup(s)) == NULL)
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fatal("out of memory\n");
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return p;
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}
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/*
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* Vanilla terminal output.
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*/
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void
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say(const char *pat, ...)
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{
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va_list ap;
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va_start(ap, pat);
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vfprintf(stderr, pat, ap);
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va_end(ap);
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Fflush(stderr);
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}
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/*
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* Terminal output, pun intended.
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*/
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void /* very void */
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fatal(const char *pat, ...)
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{
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va_list ap;
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va_start(ap, pat);
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fprintf(stderr, "patch: **** ");
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vfprintf(stderr, pat, ap);
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va_end(ap);
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my_exit(1);
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}
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/*
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* Say something from patch, something from the system, then silence...
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*/
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void /* very void */
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pfatal(const char *pat, ...)
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{
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va_list ap;
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int errnum = errno;
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va_start(ap, pat);
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fprintf(stderr, "patch: **** ");
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vfprintf(stderr, pat, ap);
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fprintf(stderr, ": %s\n", strerror(errnum));
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va_end(ap);
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my_exit(1);
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}
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/*
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* Get a response from the user, somehow or other.
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*/
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void
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ask(const char *pat, ...)
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{
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int ttyfd;
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int r;
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bool tty2 = isatty(2);
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va_list ap;
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va_start(ap, pat);
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(void)vsprintf(buf, pat, ap);
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va_end(ap);
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Fflush(stderr);
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write(2, buf, strlen(buf));
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if (tty2) { /* might be redirected to a file */
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r = read(2, buf, sizeof buf);
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} else if (isatty(1)) { /* this may be new file output */
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Fflush(stdout);
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write(1, buf, strlen(buf));
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r = read(1, buf, sizeof buf);
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} else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
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/* might be deleted or unwritable */
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write(ttyfd, buf, strlen(buf));
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r = read(ttyfd, buf, sizeof buf);
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Close(ttyfd);
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} else if (isatty(0)) { /* this is probably patch input */
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Fflush(stdin);
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write(0, buf, strlen(buf));
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r = read(0, buf, sizeof buf);
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} else { /* no terminal at all--default it */
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buf[0] = '\n';
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r = 1;
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}
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if (r <= 0)
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buf[0] = 0;
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else
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buf[r] = '\0';
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if (!tty2)
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say("%s", buf);
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}
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/*
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* How to handle certain events when not in a critical region.
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*/
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void
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set_signals(int reset)
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{
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static void (*hupval)(int);
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static void (*intval)(int);
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if (!reset) {
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hupval = signal(SIGHUP, SIG_IGN);
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if (hupval != SIG_IGN)
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hupval = my_exit;
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intval = signal(SIGINT, SIG_IGN);
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if (intval != SIG_IGN)
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intval = my_exit;
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}
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Signal(SIGHUP, hupval);
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Signal(SIGINT, intval);
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}
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/*
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* How to handle certain events when in a critical region.
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*/
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void
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ignore_signals()
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{
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Signal(SIGHUP, SIG_IGN);
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Signal(SIGINT, SIG_IGN);
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}
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/*
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* Make sure we'll have the directories to create a file.
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* If `striplast' is TRUE, ignore the last element of `filename'.
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*/
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void
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makedirs(char *filename, bool striplast)
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{
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char tmpbuf[MAXPATHLEN];
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char *s = tmpbuf;
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char *dirv[MAXPATHLEN]; /* Point to the NULs between elements. */
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int i;
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int dirvp = 0; /* Number of finished entries in dirv. */
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/*
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* Copy `filename' into `tmpbuf' with a NUL instead of a slash
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* between the directories.
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*/
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while (*filename) {
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if (*filename == '/') {
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filename++;
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dirv[dirvp++] = s;
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*s++ = '\0';
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} else {
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*s++ = *filename++;
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}
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}
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*s = '\0';
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dirv[dirvp] = s;
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if (striplast)
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dirvp--;
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if (dirvp < 0)
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return;
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strlcpy(buf, "mkdir", sizeof(buf));
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s = buf;
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for (i = 0; i <= dirvp; i++) {
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struct stat sbuf;
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if (stat(tmpbuf, &sbuf) && errno == ENOENT) {
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while (*s)
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s++;
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*s++ = ' ';
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strlcpy(s, tmpbuf, sizeof(buf) - (s - buf));
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}
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*dirv[i] = '/';
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}
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if (s != buf)
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system(buf);
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}
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/*
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* Make filenames more reasonable.
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*/
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char *
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fetchname(char *at, int strip_leading, int assume_exists)
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{
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char *fullname;
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char *name;
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char *t;
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char tmpbuf[MAXPATHLEN];
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int sleading = strip_leading;
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if (!at)
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return NULL;
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while (isspace((unsigned char)*at))
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at++;
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#ifdef DEBUGGING
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if (debug & 128)
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say("fetchname %s %d %d\n", at, strip_leading, assume_exists);
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#endif
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filename_is_dev_null = FALSE;
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if (strnEQ(at, "/dev/null", 9)) {
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/* So files can be created by diffing against /dev/null. */
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filename_is_dev_null = TRUE;
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return NULL;
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}
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name = fullname = t = xstrdup(at);
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/* Strip off up to `sleading' leading slashes and null terminate. */
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for (; *t && !isspace((unsigned char)*t); t++)
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if (*t == '/')
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if (--sleading >= 0)
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name = t + 1;
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*t = '\0';
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/*
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* If no -p option was given (957 is the default value!),
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* we were given a relative pathname,
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* and the leading directories that we just stripped off all exist,
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* put them back on.
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*/
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if (strip_leading == 957 && name != fullname && *fullname != '/') {
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name[-1] = '\0';
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if (stat(fullname, &filestat) == 0 &&
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S_ISDIR(filestat.st_mode)) {
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name[-1] = '/';
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name = fullname;
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}
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}
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name = xstrdup(name);
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free(fullname);
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if (stat(name, &filestat) && !assume_exists) {
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char *filebase = basename(name);
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size_t pathlen = filebase - name;
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/* Put any leading path into `tmpbuf'. */
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if (pathlen >= sizeof(tmpbuf))
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return NULL;
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strncpy(tmpbuf, name, pathlen);
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tmpbuf[pathlen] = '\0';
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#define try(f, a1, a2) \
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(snprintf(tmpbuf + pathlen, sizeof(tmpbuf) - pathlen, f, a1, a2), \
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stat(tmpbuf, &filestat) == 0)
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#define try1(f, a1) \
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(snprintf(tmpbuf + pathlen, sizeof(tmpbuf) - pathlen, f, a1), \
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stat(tmpbuf, &filestat) == 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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try("SCCS/%s%s", SCCSPREFIX, filebase) ||
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try( "%s%s", SCCSPREFIX, filebase))
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return name;
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free(name);
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name = NULL;
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}
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return name;
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}
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