d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
9bdc4300cd
freebsd-skq/contrib/mtree/spec.c
brooks 7f7167d476 MFC r273796 
Import in latest mtree from NetBSD to fix a bug in parsing group files
that jmg fixed upstream.

Sponsored by:	DARPA, AFRL
2014-11-04 22:47:51 +00:00

853 lines
22 KiB
C
Raw Blame History

/* $NetBSD: spec.c,v 1.89 2014/04/24 17:22:41 christos Exp $ */
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
/*-
* Copyright (c) 2001-2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn of Wasabi Systems.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(__RCSID) && !defined(lint)
#if 0
static char sccsid[] = "@(#)spec.c 8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: spec.c,v 1.89 2014/04/24 17:22:41 christos Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <vis.h>
#include <util.h>
#include "extern.h"
#include "pack_dev.h"
size_t mtree_lineno; /* Current spec line number */
int mtree_Mflag; /* Merge duplicate entries */
int mtree_Wflag; /* Don't "whack" permissions */
int mtree_Sflag; /* Sort entries */
static dev_t parsedev(char *);
static void replacenode(NODE *, NODE *);
static void set(char *, NODE *);
static void unset(char *, NODE *);
static void addchild(NODE *, NODE *);
static int nodecmp(const NODE *, const NODE *);
static int appendfield(FILE *, int, const char *, ...) __printflike(3, 4);
#define REPLACEPTR(x,v) do { if ((x)) free((x)); (x) = (v); } while (0)
NODE *
spec(FILE *fp)
{
NODE *centry, *last, *pathparent, *cur;
char *p, *e, *next;
NODE ginfo, *root;
char *buf, *tname, *ntname;
size_t tnamelen, plen;
root = NULL;
centry = last = NULL;
tname = NULL;
tnamelen = 0;
memset(&ginfo, 0, sizeof(ginfo));
for (mtree_lineno = 0;
(buf = fparseln(fp, NULL, &mtree_lineno, NULL,
FPARSELN_UNESCCOMM));
free(buf)) {
/* Skip leading whitespace. */
for (p = buf; *p && isspace((unsigned char)*p); ++p)
continue;
/* If nothing but whitespace, continue. */
if (!*p)
continue;
#ifdef DEBUG
fprintf(stderr, "line %lu: {%s}\n",
(u_long)mtree_lineno, p);
#endif
/* Grab file name, "$", "set", or "unset". */
next = buf;
while ((p = strsep(&next, " \t")) != NULL && *p == '\0')
continue;
if (p == NULL)
mtree_err("missing field");
if (p[0] == '/') {
if (strcmp(p + 1, "set") == 0)
set(next, &ginfo);
else if (strcmp(p + 1, "unset") == 0)
unset(next, &ginfo);
else
mtree_err("invalid specification `%s'", p);
continue;
}
if (strcmp(p, "..") == 0) {
/* Don't go up, if haven't gone down. */
if (root == NULL)
goto noparent;
if (last->type != F_DIR || last->flags & F_DONE) {
if (last == root)
goto noparent;
last = last->parent;
}
last->flags |= F_DONE;
continue;
noparent: mtree_err("no parent node");
}
plen = strlen(p) + 1;
if (plen > tnamelen) {
if ((ntname = realloc(tname, plen)) == NULL)
mtree_err("realloc: %s", strerror(errno));
tname = ntname;
tnamelen = plen;
}
if (strunvis(tname, p) == -1)
mtree_err("strunvis failed on `%s'", p);
p = tname;
pathparent = NULL;
if (strchr(p, '/') != NULL) {
cur = root;
for (; (e = strchr(p, '/')) != NULL; p = e+1) {
if (p == e)
continue; /* handle // */
*e = '\0';
if (strcmp(p, ".") != 0) {
while (cur &&
strcmp(cur->name, p) != 0) {
cur = cur->next;
}
}
if (cur == NULL || cur->type != F_DIR) {
mtree_err("%s: %s", tname,
"missing directory in specification");
}
*e = '/';
pathparent = cur;
cur = cur->child;
}
if (*p == '\0')
mtree_err("%s: empty leaf element", tname);
}
if ((centry = calloc(1, sizeof(NODE) + strlen(p))) == NULL)
mtree_err("%s", strerror(errno));
*centry = ginfo;
centry->lineno = mtree_lineno;
strcpy(centry->name, p);
#define MAGIC "?*["
if (strpbrk(p, MAGIC))
centry->flags |= F_MAGIC;
set(next, centry);
if (root == NULL) {
/*
* empty tree
*/
/*
* Allow a bare "." root node by forcing it to
* type=dir for compatibility with FreeBSD.
*/
if (strcmp(centry->name, ".") == 0 && centry->type == 0)
centry->type = F_DIR;
if (strcmp(centry->name, ".") != 0 ||
centry->type != F_DIR)
mtree_err(
"root node must be the directory `.'");
last = root = centry;
root->parent = root;
} else if (pathparent != NULL) {
/*
* full path entry; add or replace
*/
centry->parent = pathparent;
addchild(pathparent, centry);
last = centry;
} else if (strcmp(centry->name, ".") == 0) {
/*
* duplicate "." entry; always replace
*/
replacenode(root, centry);
} else if (last->type == F_DIR && !(last->flags & F_DONE)) {
/*
* new relative child in current dir;
* add or replace
*/
centry->parent = last;
addchild(last, centry);
last = centry;
} else {
/*
* new relative child in parent dir
* (after encountering ".." entry);
* add or replace
*/
centry->parent = last->parent;
addchild(last->parent, centry);
last = centry;
}
}
return (root);
}
void
free_nodes(NODE *root)
{
NODE *cur, *next;
if (root == NULL)
return;
next = NULL;
for (cur = root; cur != NULL; cur = next) {
next = cur->next;
free_nodes(cur->child);
REPLACEPTR(cur->slink, NULL);
REPLACEPTR(cur->md5digest, NULL);
REPLACEPTR(cur->rmd160digest, NULL);
REPLACEPTR(cur->sha1digest, NULL);
REPLACEPTR(cur->sha256digest, NULL);
REPLACEPTR(cur->sha384digest, NULL);
REPLACEPTR(cur->sha512digest, NULL);
REPLACEPTR(cur->tags, NULL);
REPLACEPTR(cur, NULL);
}
}
/*
* appendfield --
* Like fprintf(), but output a space either before or after
* the regular output, according to the pathlast flag.
*/
static int
appendfield(FILE *fp, int pathlast, const char *fmt, ...)
{
va_list ap;
int result;
va_start(ap, fmt);
if (!pathlast)
fprintf(fp, " ");
result = vprintf(fmt, ap);
if (pathlast)
fprintf(fp, " ");
va_end(ap);
return result;
}
/*
* dump_nodes --
* dump the NODEs from `cur', based in the directory `dir'.
* if pathlast is none zero, print the path last, otherwise print
* it first.
*/
void
dump_nodes(FILE *fp, const char *dir, NODE *root, int pathlast)
{
NODE *cur;
char path[MAXPATHLEN];
const char *name;
char *str;
char *p, *q;
for (cur = root; cur != NULL; cur = cur->next) {
if (cur->type != F_DIR && !matchtags(cur))
continue;
if (snprintf(path, sizeof(path), "%s%s%s",
dir, *dir ? "/" : "", cur->name)
>= (int)sizeof(path))
mtree_err("Pathname too long.");
if (!pathlast)
fprintf(fp, "%s", vispath(path));
#define MATCHFLAG(f) ((keys & (f)) && (cur->flags & (f)))
if (MATCHFLAG(F_TYPE))
appendfield(fp, pathlast, "type=%s",
nodetype(cur->type));
if (MATCHFLAG(F_UID | F_UNAME)) {
if (keys & F_UNAME &&
(name = user_from_uid(cur->st_uid, 1)) != NULL)
appendfield(fp, pathlast, "uname=%s", name);
else
appendfield(fp, pathlast, "uid=%u",
cur->st_uid);
}
if (MATCHFLAG(F_GID | F_GNAME)) {
if (keys & F_GNAME &&
(name = group_from_gid(cur->st_gid, 1)) != NULL)
appendfield(fp, pathlast, "gname=%s", name);
else
appendfield(fp, pathlast, "gid=%u",
cur->st_gid);
}
if (MATCHFLAG(F_MODE))
appendfield(fp, pathlast, "mode=%#o", cur->st_mode);
if (MATCHFLAG(F_DEV) &&
(cur->type == F_BLOCK || cur->type == F_CHAR))
appendfield(fp, pathlast, "device=%#jx",
(uintmax_t)cur->st_rdev);
if (MATCHFLAG(F_NLINK))
appendfield(fp, pathlast, "nlink=%d", cur->st_nlink);
if (MATCHFLAG(F_SLINK))
appendfield(fp, pathlast, "link=%s",
vispath(cur->slink));
if (MATCHFLAG(F_SIZE))
appendfield(fp, pathlast, "size=%ju",
(uintmax_t)cur->st_size);
if (MATCHFLAG(F_TIME))
appendfield(fp, pathlast, "time=%jd.%09ld",
(intmax_t)cur->st_mtimespec.tv_sec,
cur->st_mtimespec.tv_nsec);
if (MATCHFLAG(F_CKSUM))
appendfield(fp, pathlast, "cksum=%lu", cur->cksum);
if (MATCHFLAG(F_MD5))
appendfield(fp, pathlast, "%s=%s", MD5KEY,
cur->md5digest);
if (MATCHFLAG(F_RMD160))
appendfield(fp, pathlast, "%s=%s", RMD160KEY,
cur->rmd160digest);
if (MATCHFLAG(F_SHA1))
appendfield(fp, pathlast, "%s=%s", SHA1KEY,
cur->sha1digest);
if (MATCHFLAG(F_SHA256))
appendfield(fp, pathlast, "%s=%s", SHA256KEY,
cur->sha256digest);
if (MATCHFLAG(F_SHA384))
appendfield(fp, pathlast, "%s=%s", SHA384KEY,
cur->sha384digest);
if (MATCHFLAG(F_SHA512))
appendfield(fp, pathlast, "%s=%s", SHA512KEY,
cur->sha512digest);
if (MATCHFLAG(F_FLAGS)) {
str = flags_to_string(cur->st_flags, "none");
appendfield(fp, pathlast, "flags=%s", str);
free(str);
}
if (MATCHFLAG(F_IGN))
appendfield(fp, pathlast, "ignore");
if (MATCHFLAG(F_OPT))
appendfield(fp, pathlast, "optional");
if (MATCHFLAG(F_TAGS)) {
/* don't output leading or trailing commas */
p = cur->tags;
while (*p == ',')
p++;
q = p + strlen(p);
while(q > p && q[-1] == ',')
q--;
appendfield(fp, pathlast, "tags=%.*s", (int)(q - p), p);
}
puts(pathlast ? vispath(path) : "");
if (cur->child)
dump_nodes(fp, path, cur->child, pathlast);
}
}
/*
* vispath --
* strsvis(3) encodes path, which must not be longer than MAXPATHLEN
* characters long, and returns a pointer to a static buffer containing
* the result.
*/
char *
vispath(const char *path)
{
static const char extra[] = { ' ', '\t', '\n', '\\', '#', '\0' };
static const char extra_glob[] = { ' ', '\t', '\n', '\\', '#', '*',
'?', '[', '\0' };
static char pathbuf[4*MAXPATHLEN + 1];
if (flavor == F_NETBSD6)
strsvis(pathbuf, path, VIS_CSTYLE, extra);
else
strsvis(pathbuf, path, VIS_OCTAL, extra_glob);
return pathbuf;
}
static dev_t
parsedev(char *arg)
{
#define MAX_PACK_ARGS 3
u_long numbers[MAX_PACK_ARGS];
char *p, *ep, *dev;
int argc;
pack_t *pack;
dev_t result;
const char *error = NULL;
if ((dev = strchr(arg, ',')) != NULL) {
*dev++='\0';
if ((pack = pack_find(arg)) == NULL)
mtree_err("unknown format `%s'", arg);
argc = 0;
while ((p = strsep(&dev, ",")) != NULL) {
if (*p == '\0')
mtree_err("missing number");
numbers[argc++] = strtoul(p, &ep, 0);
if (*ep != '\0')
mtree_err("invalid number `%s'",
p);
if (argc > MAX_PACK_ARGS)
mtree_err("too many arguments");
}
if (argc < 2)
mtree_err("not enough arguments");
result = (*pack)(argc, numbers, &error);
if (error != NULL)
mtree_err("%s", error);
} else {
result = (dev_t)strtoul(arg, &ep, 0);
if (*ep != '\0')
mtree_err("invalid device `%s'", arg);
}
return (result);
}
static void
replacenode(NODE *cur, NODE *new)
{
#define REPLACE(x) cur->x = new->x
#define REPLACESTR(x) REPLACEPTR(cur->x,new->x)
if (cur->type != new->type) {
if (mtree_Mflag) {
/*
* merge entries with different types; we
* don't want children retained in this case.
*/
REPLACE(type);
free_nodes(cur->child);
cur->child = NULL;
} else {
mtree_err(
"existing entry for `%s', type `%s'"
" does not match type `%s'",
cur->name, nodetype(cur->type),
nodetype(new->type));
}
}
REPLACE(st_size);
REPLACE(st_mtimespec);
REPLACESTR(slink);
if (cur->slink != NULL) {
if ((cur->slink = strdup(new->slink)) == NULL)
mtree_err("memory allocation error");
if (strunvis(cur->slink, new->slink) == -1)
mtree_err("strunvis failed on `%s'", new->slink);
free(new->slink);
}
REPLACE(st_uid);
REPLACE(st_gid);
REPLACE(st_mode);
REPLACE(st_rdev);
REPLACE(st_flags);
REPLACE(st_nlink);
REPLACE(cksum);
REPLACESTR(md5digest);
REPLACESTR(rmd160digest);
REPLACESTR(sha1digest);
REPLACESTR(sha256digest);
REPLACESTR(sha384digest);
REPLACESTR(sha512digest);
REPLACESTR(tags);
REPLACE(lineno);
REPLACE(flags);
free(new);
}
static void
set(char *t, NODE *ip)
{
int type, value, len;
gid_t gid;
uid_t uid;
char *kw, *val, *md, *ep;
void *m;
while ((kw = strsep(&t, "= \t")) != NULL) {
if (*kw == '\0')
continue;
if (strcmp(kw, "all") == 0)
mtree_err("invalid keyword `all'");
ip->flags |= type = parsekey(kw, &value);
if (!value)
/* Just set flag bit (F_IGN and F_OPT) */
continue;
while ((val = strsep(&t, " \t")) != NULL && *val == '\0')
continue;
if (val == NULL)
mtree_err("missing value");
switch (type) {
case F_CKSUM:
ip->cksum = strtoul(val, &ep, 10);
if (*ep)
mtree_err("invalid checksum `%s'", val);
break;
case F_DEV:
ip->st_rdev = parsedev(val);
break;
case F_FLAGS:
if (strcmp("none", val) == 0)
ip->st_flags = 0;
else if (string_to_flags(&val, &ip->st_flags, NULL)
!= 0)
mtree_err("invalid flag `%s'", val);
break;
case F_GID:
ip->st_gid = (gid_t)strtoul(val, &ep, 10);
if (*ep)
mtree_err("invalid gid `%s'", val);
break;
case F_GNAME:
if (mtree_Wflag) /* don't parse if whacking */
break;
if (gid_from_group(val, &gid) == -1)
mtree_err("unknown group `%s'", val);
ip->st_gid = gid;
break;
case F_MD5:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->md5digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
case F_MODE:
if ((m = setmode(val)) == NULL)
mtree_err("cannot set file mode `%s' (%s)",
val, strerror(errno));
ip->st_mode = getmode(m, 0);
free(m);
break;
case F_NLINK:
ip->st_nlink = (nlink_t)strtoul(val, &ep, 10);
if (*ep)
mtree_err("invalid link count `%s'", val);
break;
case F_RMD160:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->rmd160digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
case F_SHA1:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->sha1digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
case F_SIZE:
ip->st_size = (off_t)strtoll(val, &ep, 10);
if (*ep)
mtree_err("invalid size `%s'", val);
break;
case F_SLINK:
if ((ip->slink = strdup(val)) == NULL)
mtree_err("memory allocation error");
if (strunvis(ip->slink, val) == -1)
mtree_err("strunvis failed on `%s'", val);
break;
case F_TAGS:
len = strlen(val) + 3; /* "," + str + ",\0" */
if ((ip->tags = malloc(len)) == NULL)
mtree_err("memory allocation error");
snprintf(ip->tags, len, ",%s,", val);
break;
case F_TIME:
ip->st_mtimespec.tv_sec =
(time_t)strtoll(val, &ep, 10);
if (*ep != '.')
mtree_err("invalid time `%s'", val);
val = ep + 1;
ip->st_mtimespec.tv_nsec = strtol(val, &ep, 10);
if (*ep)
mtree_err("invalid time `%s'", val);
break;
case F_TYPE:
ip->type = parsetype(val);
break;
case F_UID:
ip->st_uid = (uid_t)strtoul(val, &ep, 10);
if (*ep)
mtree_err("invalid uid `%s'", val);
break;
case F_UNAME:
if (mtree_Wflag) /* don't parse if whacking */
break;
if (uid_from_user(val, &uid) == -1)
mtree_err("unknown user `%s'", val);
ip->st_uid = uid;
break;
case F_SHA256:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->sha256digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
case F_SHA384:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->sha384digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
case F_SHA512:
if (val[0]=='0' && val[1]=='x')
md=&val[2];
else
md=val;
if ((ip->sha512digest = strdup(md)) == NULL)
mtree_err("memory allocation error");
break;
default:
mtree_err(
"set(): unsupported key type 0x%x (INTERNAL ERROR)",
type);
/* NOTREACHED */
}
}
}
static void
unset(char *t, NODE *ip)
{
char *p;
while ((p = strsep(&t, " \t")) != NULL) {
if (*p == '\0')
continue;
ip->flags &= ~parsekey(p, NULL);
}
}
/*
* addchild --
* Add the centry node as a child of the pathparent node. If
* centry is a duplicate, call replacenode(). If centry is not
* a duplicate, insert it into the linked list referenced by
* pathparent->child. Keep the list sorted if Sflag is set.
*/
static void
addchild(NODE *pathparent, NODE *centry)
{
NODE *samename; /* node with the same name as centry */
NODE *replacepos; /* if non-NULL, centry should replace this node */
NODE *insertpos; /* if non-NULL, centry should be inserted
* after this node */
NODE *cur; /* for stepping through the list */
NODE *last; /* the last node in the list */
int cmp;
samename = NULL;
replacepos = NULL;
insertpos = NULL;
last = NULL;
cur = pathparent->child;
if (cur == NULL) {
/* centry is pathparent's first and only child node so far */
pathparent->child = centry;
return;
}
/*
* pathparent already has at least one other child, so add the
* centry node to the list.
*
* We first scan through the list looking for an existing node
* with the same name (setting samename), and also looking
* for the correct position to replace or insert the new node
* (setting replacepos and/or insertpos).
*/
for (; cur != NULL; last = cur, cur = cur->next) {
if (strcmp(centry->name, cur->name) == 0) {
samename = cur;
}
if (mtree_Sflag) {
cmp = nodecmp(centry, cur);
if (cmp == 0) {
replacepos = cur;
} else if (cmp > 0) {
insertpos = cur;
}
}
}
if (! mtree_Sflag) {
if (samename != NULL) {
/* replace node with same name */
replacepos = samename;
} else {
/* add new node at end of list */
insertpos = last;
}
}
if (samename != NULL) {
/*
* We found a node with the same name above. Call
* replacenode(), which will either exit with an error,
* or replace the information in the samename node and
* free the information in the centry node.
*/
replacenode(samename, centry);
if (samename == replacepos) {
/* The just-replaced node was in the correct position */
return;
}
if (samename == insertpos || samename->prev == insertpos) {
/*
* We thought the new node should be just before
* or just after the replaced node, but that would
* be equivalent to just retaining the replaced node.
*/
return;
}
/*
* The just-replaced node is in the wrong position in
* the list. This can happen if sort order depends on
* criteria other than the node name.
*
* Make centry point to the just-replaced node. Unlink
* the just-replaced node from the list, and allow it to
* be insterted in the correct position later.
*/
centry = samename;
if (centry->prev)
centry->prev->next = centry->next;
else {
/* centry->next is the new head of the list */
pathparent->child = centry->next;
assert(centry->next != NULL);
}
if (centry->next)
centry->next->prev = centry->prev;
centry->prev = NULL;
centry->next = NULL;
}
if (insertpos == NULL) {
/* insert centry at the beginning of the list */
pathparent->child->prev = centry;
centry->next = pathparent->child;
centry->prev = NULL;
pathparent->child = centry;
} else {
/* insert centry into the list just after insertpos */
centry->next = insertpos->next;
insertpos->next = centry;
centry->prev = insertpos;
if (centry->next)
centry->next->prev = centry;
}
return;
}
/*
* nodecmp --
* used as a comparison function by addchild() to control the order
* in which entries appear within a list of sibling nodes. We make
* directories sort after non-directories, but otherwise sort in
* strcmp() order.
*
* Keep this in sync with dcmp() in create.c.
*/
static int
nodecmp(const NODE *a, const NODE *b)
{
if ((a->type & F_DIR) != 0) {
if ((b->type & F_DIR) == 0)
return 1;
} else if ((b->type & F_DIR) != 0)
return -1;
return strcmp(a->name, b->name);
}
Reference in New Issue View Git Blame Copy Permalink