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/* $NetBSD: arch.c,v 1.174 2020/11/08 09:15:19 rillig Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* 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) 1989 by Berkeley Softworks
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Adam de Boor.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/* Manipulate libraries, archives and their members.
*
* The first time an archive is referenced, all of its members' headers are
* read and cashed and the archive closed again. All cashed archives are kept
* on a list which is searched each time an archive member is referenced.
*
* The interface to this module is:
*
* Arch_Init Initialize this module.
*
* Arch_End Clean up this module.
*
* Arch_ParseArchive
* Parse an archive specification such as
* "archive.a(member1 member2)".
*
* Arch_Touch Alter the modification time of the archive
* member described by the given node to be
* the time when make was started.
*
* Arch_TouchLib Update the modification time of the library
* described by the given node. This is special
* because it also updates the modification time
* of the library's table of contents.
*
* Arch_UpdateMTime
* Find the modification time of a member of
* an archive *in the archive* and place it in the
* member's GNode.
*
* Arch_UpdateMemberMTime
* Find the modification time of a member of
* an archive. Called when the member doesn't
* already exist. Looks in the archive for the
* modification time. Returns the modification
* time.
*
* Arch_FindLib Search for a library along a path. The
* library name in the GNode should be in
* -l<name> format.
*
* Arch_LibOODate Decide if a library node is out-of-date.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/param.h>
#include <ar.h>
#include <utime.h>
#include "make.h"
#include "dir.h"
#include "config.h"
/* "@(#)arch.c 8.2 (Berkeley) 1/2/94" */
MAKE_RCSID("$NetBSD: arch.c,v 1.174 2020/11/08 09:15:19 rillig Exp $");
typedef struct List ArchList;
typedef struct ListNode ArchListNode;
static ArchList *archives; /* The archives we've already examined */
typedef struct Arch {
char *name; /* Name of archive */
HashTable members; /* All the members of the archive described
* by <name, struct ar_hdr *> key/value pairs */
char *fnametab; /* Extended name table strings */
size_t fnamesize; /* Size of the string table */
} Arch;
static FILE *ArchFindMember(const char *, const char *,
struct ar_hdr *, const char *);
#if defined(__svr4__) || defined(__SVR4) || defined(__ELF__)
#define SVR4ARCHIVES
static int ArchSVR4Entry(Arch *, char *, size_t, FILE *);
#endif
#ifdef CLEANUP
static void
ArchFree(void *ap)
{
Arch *a = ap;
HashIter hi;
/* Free memory from hash entries */
HashIter_Init(&hi, &a->members);
while (HashIter_Next(&hi) != NULL)
free(hi.entry->value);
free(a->name);
free(a->fnametab);
HashTable_Done(&a->members);
free(a);
}
#endif
/*
* Parse an archive specification such as "archive.a(member1 member2.${EXT})",
* adding nodes for the expanded members to nodeLst. Nodes are created as
* necessary.
*
* Input:
* pp The start of the specification.
* nodeLst The list on which to place the nodes.
* ctxt The context in which to expand variables.
*
* Output:
* return TRUE if it was a valid specification.
* *pp Points to the first non-space after the archive spec.
* *nodeLst Nodes for the members have been added.
*/
Boolean
Arch_ParseArchive(char **pp, GNodeList *nodeLst, GNode *ctxt)
{
char *cp; /* Pointer into line */
GNode *gn; /* New node */
char *libName; /* Library-part of specification */
char *libName_freeIt = NULL;
char *memName; /* Member-part of specification */
char saveChar; /* Ending delimiter of member-name */
Boolean expandLibName; /* Whether the parsed libName contains
* variable expressions that need to be
* expanded */
libName = *pp;
expandLibName = FALSE;
for (cp = libName; *cp != '(' && *cp != '\0';) {
if (*cp == '$') {
/*
* Variable spec, so call the Var module to parse the puppy
* so we can safely advance beyond it...
*/
const char *nested_p = cp;
void *result_freeIt;
const char *result;
Boolean isError;
/* XXX: is expanded twice: once here and once below */
(void)Var_Parse(&nested_p, ctxt, VARE_UNDEFERR|VARE_WANTRES,
&result, &result_freeIt);
/* TODO: handle errors */
isError = result == var_Error;
free(result_freeIt);
if (isError)
return FALSE;
expandLibName = TRUE;
cp += nested_p - cp;
} else
cp++;
}
*cp++ = '\0';
if (expandLibName) {
(void)Var_Subst(libName, ctxt, VARE_UNDEFERR|VARE_WANTRES, &libName);
/* TODO: handle errors */
libName_freeIt = libName;
}
for (;;) {
/*
* First skip to the start of the member's name, mark that
* place and skip to the end of it (either white-space or
* a close paren).
*/
Boolean doSubst = FALSE; /* TRUE if need to substitute in memName */
pp_skip_whitespace(&cp);
memName = cp;
while (*cp != '\0' && *cp != ')' && !ch_isspace(*cp)) {
if (*cp == '$') {
/*
* Variable spec, so call the Var module to parse the puppy
* so we can safely advance beyond it...
*/
void *freeIt;
const char *result;
Boolean isError;
const char *nested_p = cp;
(void)Var_Parse(&nested_p, ctxt, VARE_UNDEFERR|VARE_WANTRES,
&result, &freeIt);
/* TODO: handle errors */
isError = result == var_Error;
free(freeIt);
if (isError)
return FALSE;
doSubst = TRUE;
cp += nested_p - cp;
} else {
cp++;
}
}
/*
* If the specification ends without a closing parenthesis,
* chances are there's something wrong (like a missing backslash),
* so it's better to return failure than allow such things to happen
*/
if (*cp == '\0') {
Parse_Error(PARSE_FATAL, "No closing parenthesis in archive specification");
return FALSE;
}
/*
* If we didn't move anywhere, we must be done
*/
if (cp == memName) {
break;
}
saveChar = *cp;
*cp = '\0';
/*
* XXX: This should be taken care of intelligently by
* SuffExpandChildren, both for the archive and the member portions.
*/
/*
* If member contains variables, try and substitute for them.
* This will slow down archive specs with dynamic sources, of course,
* since we'll be (non-)substituting them three times, but them's
* the breaks -- we need to do this since SuffExpandChildren calls
* us, otherwise we could assume the thing would be taken care of
* later.
*/
if (doSubst) {
char *buf;
char *sacrifice;
char *oldMemName = memName;
(void)Var_Subst(memName, ctxt, VARE_UNDEFERR|VARE_WANTRES,
&memName);
/* TODO: handle errors */
/*
* Now form an archive spec and recurse to deal with nested
* variables and multi-word variable values.... The results
* are just placed at the end of the nodeLst we're returning.
*/
buf = sacrifice = str_concat4(libName, "(", memName, ")");
if (strchr(memName, '$') != NULL &&
strcmp(memName, oldMemName) == 0) {
/*
* Must contain dynamic sources, so we can't deal with it now.
* Just create an ARCHV node for the thing and let
* SuffExpandChildren handle it...
*/
gn = Targ_GetNode(buf);
gn->type |= OP_ARCHV;
Lst_Append(nodeLst, gn);
} else if (!Arch_ParseArchive(&sacrifice, nodeLst, ctxt)) {
/* Error in nested call. */
free(buf);
return FALSE;
}
free(buf);
} else if (Dir_HasWildcards(memName)) {
StringList *members = Lst_New();
Dir_Expand(memName, dirSearchPath, members);
while (!Lst_IsEmpty(members)) {
char *member = Lst_Dequeue(members);
char *fullname = str_concat4(libName, "(", member, ")");
free(member);
gn = Targ_GetNode(fullname);
free(fullname);
gn->type |= OP_ARCHV;
Lst_Append(nodeLst, gn);
}
Lst_Free(members);
} else {
char *fullname = str_concat4(libName, "(", memName, ")");
gn = Targ_GetNode(fullname);
free(fullname);
/*
* We've found the node, but have to make sure the rest of the
* world knows it's an archive member, without having to
* constantly check for parentheses, so we type the thing with
* the OP_ARCHV bit before we place it on the end of the
* provided list.
*/
gn->type |= OP_ARCHV;
Lst_Append(nodeLst, gn);
}
if (doSubst) {
free(memName);
}
*cp = saveChar;
}
free(libName_freeIt);
cp++; /* skip the ')' */
/* We promised that pp would be set up at the next non-space. */
pp_skip_whitespace(&cp);
*pp = cp;
return TRUE;
}
/* Locate a member of an archive, given the path of the archive and the path
* of the desired member.
*
* Input:
* archive Path to the archive
* member Name of member; only its basename is used.
* addToCache TRUE if archive should be cached if not already so.
*
* Results:
* The ar_hdr for the member, or NULL.
*
* See ArchFindMember for an almost identical copy of this code.
*/
static struct ar_hdr *
ArchStatMember(const char *archive, const char *member, Boolean addToCache)
{
#define AR_MAX_NAME_LEN (sizeof arh.ar_name - 1)
FILE *arch; /* Stream to archive */
size_t size; /* Size of archive member */
char magic[SARMAG];
ArchListNode *ln;
Arch *ar; /* Archive descriptor */
struct ar_hdr arh; /* archive-member header for reading archive */
char memName[MAXPATHLEN + 1];
/* Current member name while hashing. */
/*
* Because of space constraints and similar things, files are archived
* using their basename, not the entire path.
*/
const char *lastSlash = strrchr(member, '/');
if (lastSlash != NULL)
member = lastSlash + 1;
for (ln = archives->first; ln != NULL; ln = ln->next) {
const Arch *a = ln->datum;
if (strcmp(a->name, archive) == 0)
break;
}
if (ln != NULL) {
struct ar_hdr *hdr;
ar = ln->datum;
hdr = HashTable_FindValue(&ar->members, member);
if (hdr != NULL)
return hdr;
{
/* Try truncated name */
char copy[AR_MAX_NAME_LEN + 1];
size_t len = strlen(member);
if (len > AR_MAX_NAME_LEN) {
len = AR_MAX_NAME_LEN;
snprintf(copy, sizeof copy, "%s", member);
hdr = HashTable_FindValue(&ar->members, copy);
}
return hdr;
}
}
if (!addToCache) {
/*
* Caller doesn't want the thing cached, just use ArchFindMember
* to read the header for the member out and close down the stream
* again. Since the archive is not to be cached, we assume there's
* no need to allocate extra room for the header we're returning,
* so just declare it static.
*/
static struct ar_hdr sarh;
arch = ArchFindMember(archive, member, &sarh, "r");
if (arch == NULL)
return NULL;
fclose(arch);
return &sarh;
}
/*
* We don't have this archive on the list yet, so we want to find out
* everything that's in it and cache it so we can get at it quickly.
*/
arch = fopen(archive, "r");
if (arch == NULL)
return NULL;
/*
* We use the ARMAG string to make sure this is an archive we
* can handle...
*/
if (fread(magic, SARMAG, 1, arch) != 1 ||
strncmp(magic, ARMAG, SARMAG) != 0) {
(void)fclose(arch);
return NULL;
}
ar = bmake_malloc(sizeof *ar);
ar->name = bmake_strdup(archive);
ar->fnametab = NULL;
ar->fnamesize = 0;
HashTable_Init(&ar->members);
memName[AR_MAX_NAME_LEN] = '\0';
while (fread(&arh, sizeof arh, 1, arch) == 1) {
char *nameend;
/* If the header is bogus, there's no way we can recover. */
if (strncmp(arh.ar_fmag, ARFMAG, sizeof arh.ar_fmag) != 0)
goto badarch;
/*
* We need to advance the stream's pointer to the start of the
* next header. Files are padded with newlines to an even-byte
* boundary, so we need to extract the size of the file from the
* 'size' field of the header and round it up during the seek.
*/
arh.ar_size[sizeof arh.ar_size - 1] = '\0';
size = (size_t)strtol(arh.ar_size, NULL, 10);
memcpy(memName, arh.ar_name, sizeof arh.ar_name);
nameend = memName + AR_MAX_NAME_LEN;
while (nameend > memName && *nameend == ' ')
nameend--;
nameend[1] = '\0';
#ifdef SVR4ARCHIVES
/*
* svr4 names are slash terminated. Also svr4 extended AR format.
*/
if (memName[0] == '/') {
/*
* svr4 magic mode; handle it
*/
switch (ArchSVR4Entry(ar, memName, size, arch)) {
case -1: /* Invalid data */
goto badarch;
case 0: /* List of files entry */
continue;
default: /* Got the entry */
break;
}
} else {
if (nameend[0] == '/')
nameend[0] = '\0';
}
#endif
#ifdef AR_EFMT1
/*
* BSD 4.4 extended AR format: #1/<namelen>, with name as the
* first <namelen> bytes of the file
*/
if (strncmp(memName, AR_EFMT1, sizeof AR_EFMT1 - 1) == 0 &&
ch_isdigit(memName[sizeof AR_EFMT1 - 1])) {
int elen = atoi(memName + sizeof AR_EFMT1 - 1);
if ((unsigned int)elen > MAXPATHLEN)
goto badarch;
if (fread(memName, (size_t)elen, 1, arch) != 1)
goto badarch;
memName[elen] = '\0';
if (fseek(arch, -elen, SEEK_CUR) != 0)
goto badarch;
if (DEBUG(ARCH) || DEBUG(MAKE))
debug_printf("ArchStatMember: Extended format entry for %s\n",
memName);
}
#endif
{
HashEntry *he;
he = HashTable_CreateEntry(&ar->members, memName, NULL);
HashEntry_Set(he, bmake_malloc(sizeof arh));
memcpy(HashEntry_Get(he), &arh, sizeof arh);
}
if (fseek(arch, ((long)size + 1) & ~1, SEEK_CUR) != 0)
goto badarch;
}
fclose(arch);
Lst_Append(archives, ar);
/*
* Now that the archive has been read and cached, we can look into
* the addToCache table to find the desired member's header.
*/
return HashTable_FindValue(&ar->members, member);
badarch:
fclose(arch);
HashTable_Done(&ar->members);
free(ar->fnametab);
free(ar);
return NULL;
}
#ifdef SVR4ARCHIVES
/*-
*-----------------------------------------------------------------------
* ArchSVR4Entry --
* Parse an SVR4 style entry that begins with a slash.
* If it is "//", then load the table of filenames
* If it is "/<offset>", then try to substitute the long file name
* from offset of a table previously read.
* If a table is read, the file pointer is moved to the next archive
* member.
*
* Results:
* -1: Bad data in archive
* 0: A table was loaded from the file
* 1: Name was successfully substituted from table
* 2: Name was not successfully substituted from table
*-----------------------------------------------------------------------
*/
static int
ArchSVR4Entry(Arch *ar, char *inout_name, size_t size, FILE *arch)
{
#define ARLONGNAMES1 "//"
#define ARLONGNAMES2 "/ARFILENAMES"
size_t entry;
char *ptr, *eptr;
if (strncmp(inout_name, ARLONGNAMES1, sizeof ARLONGNAMES1 - 1) == 0 ||
strncmp(inout_name, ARLONGNAMES2, sizeof ARLONGNAMES2 - 1) == 0) {
if (ar->fnametab != NULL) {
DEBUG0(ARCH, "Attempted to redefine an SVR4 name table\n");
return -1;
}
/*
* This is a table of archive names, so we build one for
* ourselves
*/
ar->fnametab = bmake_malloc(size);
ar->fnamesize = size;
if (fread(ar->fnametab, size, 1, arch) != 1) {
DEBUG0(ARCH, "Reading an SVR4 name table failed\n");
return -1;
}
eptr = ar->fnametab + size;
for (entry = 0, ptr = ar->fnametab; ptr < eptr; ptr++)
if (*ptr == '/') {
entry++;
*ptr = '\0';
}
DEBUG1(ARCH, "Found svr4 archive name table with %lu entries\n",
(unsigned long)entry);
return 0;
}
if (inout_name[1] == ' ' || inout_name[1] == '\0')
return 2;
entry = (size_t)strtol(&inout_name[1], &eptr, 0);
if ((*eptr != ' ' && *eptr != '\0') || eptr == &inout_name[1]) {
DEBUG1(ARCH, "Could not parse SVR4 name %s\n", inout_name);
return 2;
}
if (entry >= ar->fnamesize) {
DEBUG2(ARCH, "SVR4 entry offset %s is greater than %lu\n",
inout_name, (unsigned long)ar->fnamesize);
return 2;
}
DEBUG2(ARCH, "Replaced %s with %s\n", inout_name, &ar->fnametab[entry]);
snprintf(inout_name, MAXPATHLEN + 1, "%s", &ar->fnametab[entry]);
return 1;
}
#endif
static Boolean
ArchiveMember_HasName(const struct ar_hdr *hdr,
const char *name, size_t namelen)
{
const size_t ar_name_len = sizeof hdr->ar_name;
const char *ar_name = hdr->ar_name;
if (strncmp(ar_name, name, namelen) != 0)
return FALSE;
if (namelen >= ar_name_len)
return namelen == ar_name_len;
/* hdr->ar_name is space-padded to the right. */
if (ar_name[namelen] == ' ')
return TRUE;
/* In archives created by GNU binutils 2.27, the member names end with
* a slash. */
if (ar_name[namelen] == '/' &&
(namelen == ar_name_len || ar_name[namelen + 1] == ' '))
return TRUE;
return FALSE;
}
/* Locate a member of an archive, given the path of the archive and the path
* of the desired member.
*
* Input:
* archive Path to the archive
* member Name of member. If it is a path, only the last
* component is used.
* out_arh Archive header to be filled in
* mode "r" for read-only access, "r+" for read-write access
*
* Output:
* return The archive file, positioned at the start of the
* member's struct ar_hdr, or NULL if the member doesn't
* exist.
* *out_arh The current struct ar_hdr for member.
*
* See ArchStatMember for an almost identical copy of this code.
*/
static FILE *
ArchFindMember(const char *archive, const char *member, struct ar_hdr *out_arh,
const char *mode)
{
FILE *arch; /* Stream to archive */
int size; /* Size of archive member */
char magic[SARMAG];
size_t len, tlen;
const char *lastSlash;
arch = fopen(archive, mode);
if (arch == NULL)
return NULL;
/*
* We use the ARMAG string to make sure this is an archive we
* can handle...
*/
if (fread(magic, SARMAG, 1, arch) != 1 ||
strncmp(magic, ARMAG, SARMAG) != 0) {
fclose(arch);
return NULL;
}
/*
* Because of space constraints and similar things, files are archived
* using their basename, not the entire path.
*/
lastSlash = strrchr(member, '/');
if (lastSlash != NULL)
member = lastSlash + 1;
len = tlen = strlen(member);
if (len > sizeof out_arh->ar_name) {
tlen = sizeof out_arh->ar_name;
}
while (fread(out_arh, sizeof *out_arh, 1, arch) == 1) {
if (strncmp(out_arh->ar_fmag, ARFMAG, sizeof out_arh->ar_fmag) != 0) {
/*
* The header is bogus, so the archive is bad
* and there's no way we can recover...
*/
fclose(arch);
return NULL;
}
DEBUG5(ARCH, "Reading archive %s member %.*s mtime %.*s\n",
archive,
(int)sizeof out_arh->ar_name, out_arh->ar_name,
(int)sizeof out_arh->ar_date, out_arh->ar_date);
if (ArchiveMember_HasName(out_arh, member, len)) {
/*
* To make life easier for callers that want to update the
* archive, we reposition the file at the start
* of the header we just read before we return the stream.
* In a more general situation, it might be better to leave
* the file at the actual member, rather than its header, but
* not here.
*/
if (fseek(arch, -(long)sizeof *out_arh, SEEK_CUR) != 0) {
fclose(arch);
return NULL;
}
return arch;
}
#ifdef AR_EFMT1
/*
* BSD 4.4 extended AR format: #1/<namelen>, with name as the
* first <namelen> bytes of the file
*/
if (strncmp(out_arh->ar_name, AR_EFMT1, sizeof AR_EFMT1 - 1) == 0 &&
ch_isdigit(out_arh->ar_name[sizeof AR_EFMT1 - 1]))
{
int elen = atoi(&out_arh->ar_name[sizeof AR_EFMT1 - 1]);
char ename[MAXPATHLEN + 1];
if ((unsigned int)elen > MAXPATHLEN) {
fclose(arch);
return NULL;
}
if (fread(ename, (size_t)elen, 1, arch) != 1) {
fclose(arch);
return NULL;
}
ename[elen] = '\0';
if (DEBUG(ARCH) || DEBUG(MAKE))
debug_printf("ArchFindMember: Extended format entry for %s\n",
ename);
if (strncmp(ename, member, len) == 0) {
/* Found as extended name */
if (fseek(arch, -(long)sizeof(struct ar_hdr) - elen,
SEEK_CUR) != 0) {
fclose(arch);
return NULL;
}
return arch;
}
if (fseek(arch, -elen, SEEK_CUR) != 0) {
fclose(arch);
return NULL;
}
}
#endif
/*
* This isn't the member we're after, so we need to advance the
* stream's pointer to the start of the next header. Files are
* padded with newlines to an even-byte boundary, so we need to
* extract the size of the file from the 'size' field of the
* header and round it up during the seek.
*/
out_arh->ar_size[sizeof out_arh->ar_size - 1] = '\0';
size = (int)strtol(out_arh->ar_size, NULL, 10);
if (fseek(arch, (size + 1) & ~1, SEEK_CUR) != 0) {
fclose(arch);
return NULL;
}
}
fclose(arch);
return NULL;
}
/* Touch a member of an archive, on disk.
* The GNode's modification time is left as-is.
*
* The st_mtime of the entire archive is also changed.
* For a library, it may be required to run ranlib after this.
*
* Input:
* gn Node of member to touch
*
* Results:
* The 'time' field of the member's header is updated.
*/
void
Arch_Touch(GNode *gn)
{
FILE *f;
struct ar_hdr arh;
f = ArchFindMember(GNode_VarArchive(gn), GNode_VarMember(gn), &arh, "r+");
if (f == NULL)
return;
snprintf(arh.ar_date, sizeof arh.ar_date, "%-ld", (unsigned long)now);
(void)fwrite(&arh, sizeof arh, 1, f);
fclose(f); /* TODO: handle errors */
}
/* Given a node which represents a library, touch the thing, making sure that
* the table of contents is also touched.
*
* Both the modification time of the library and of the RANLIBMAG member are
* set to 'now'. */
void
Arch_TouchLib(GNode *gn MAKE_ATTR_UNUSED)
{
#ifdef RANLIBMAG
FILE *f;
struct ar_hdr arh; /* Header describing table of contents */
struct utimbuf times;
f = ArchFindMember(gn->path, RANLIBMAG, &arh, "r+");
if (f == NULL)
return;
snprintf(arh.ar_date, sizeof arh.ar_date, "%-ld", (unsigned long)now);
(void)fwrite(&arh, sizeof arh, 1, f);
fclose(f); /* TODO: handle errors */
times.actime = times.modtime = now;
utime(gn->path, &times); /* TODO: handle errors */
#endif
}
/* Update the mtime of the GNode with the mtime from the archive member on
* disk (or in the cache). */
void
Arch_UpdateMTime(GNode *gn)
{
struct ar_hdr *arh;
arh = ArchStatMember(GNode_VarArchive(gn), GNode_VarMember(gn), TRUE);
if (arh != NULL)
gn->mtime = (time_t)strtol(arh->ar_date, NULL, 10);
else
gn->mtime = 0;
}
/* Given a non-existent archive member's node, update gn->mtime from its
* archived form, if it exists. */
void
Arch_UpdateMemberMTime(GNode *gn)
{
GNodeListNode *ln;
for (ln = gn->parents->first; ln != NULL; ln = ln->next) {
GNode *pgn = ln->datum;
if (pgn->type & OP_ARCHV) {
/*
* If the parent is an archive specification and is being made
* and its member's name matches the name of the node we were
* given, record the modification time of the parent in the
* child. We keep searching its parents in case some other
* parent requires this child to exist...
*/
const char *nameStart = strchr(pgn->name, '(') + 1;
const char *nameEnd = strchr(nameStart, ')');
size_t nameLen = (size_t)(nameEnd - nameStart);
if ((pgn->flags & REMAKE) &&
strncmp(nameStart, gn->name, nameLen) == 0) {
Arch_UpdateMTime(pgn);
gn->mtime = pgn->mtime;
}
} else if (pgn->flags & REMAKE) {
/*
* Something which isn't a library depends on the existence of
* this target, so it needs to exist.
*/
gn->mtime = 0;
break;
}
}
}
/* Search for a library along the given search path.
*
* The node's 'path' field is set to the found path (including the
* actual file name, not -l...). If the system can handle the -L
* flag when linking (or we cannot find the library), we assume that
* the user has placed the .LIBS variable in the final linking
* command (or the linker will know where to find it) and set the
* TARGET variable for this node to be the node's name. Otherwise,
* we set the TARGET variable to be the full path of the library,
* as returned by Dir_FindFile.
*
* Input:
* gn Node of library to find
*/
void
Arch_FindLib(GNode *gn, SearchPath *path)
{
char *libName = str_concat3("lib", gn->name + 2, ".a");
gn->path = Dir_FindFile(libName, path);
free(libName);
#ifdef LIBRARIES
Var_Set(TARGET, gn->name, gn);
#else
Var_Set(TARGET, gn->path == NULL ? gn->name : gn->path, gn);
#endif
}
/* Decide if a node with the OP_LIB attribute is out-of-date. Called from
* GNode_IsOODate to make its life easier.
* The library is cached if it hasn't been already.
*
* There are several ways for a library to be out-of-date that are
* not available to ordinary files. In addition, there are ways
* that are open to regular files that are not available to
* libraries.
*
* A library that is only used as a source is never
* considered out-of-date by itself. This does not preclude the
* library's modification time from making its parent be out-of-date.
* A library will be considered out-of-date for any of these reasons,
* given that it is a target on a dependency line somewhere:
*
* Its modification time is less than that of one of its sources
* (gn->mtime < gn->youngestChild->mtime).
*
* Its modification time is greater than the time at which the make
* began (i.e. it's been modified in the course of the make, probably
* by archiving).
*
* The modification time of one of its sources is greater than the one
* of its RANLIBMAG member (i.e. its table of contents is out-of-date).
* We don't compare the archive time vs. TOC time because they can be
* too close. In my opinion we should not bother with the TOC at all
* since this is used by 'ar' rules that affect the data contents of the
* archive, not by ranlib rules, which affect the TOC.
*/
Boolean
Arch_LibOODate(GNode *gn)
{
Boolean oodate;
if (gn->type & OP_PHONY) {
oodate = TRUE;
} else if (!GNode_IsTarget(gn) && Lst_IsEmpty(gn->children)) {
oodate = FALSE;
} else if ((!Lst_IsEmpty(gn->children) && gn->youngestChild == NULL) ||
(gn->mtime > now) ||
(gn->youngestChild != NULL &&
gn->mtime < gn->youngestChild->mtime)) {
oodate = TRUE;
} else {
#ifdef RANLIBMAG
struct ar_hdr *arh; /* Header for __.SYMDEF */
int modTimeTOC; /* The table-of-contents's mod time */
arh = ArchStatMember(gn->path, RANLIBMAG, FALSE);
if (arh != NULL) {
modTimeTOC = (int)strtol(arh->ar_date, NULL, 10);
if (DEBUG(ARCH) || DEBUG(MAKE))
debug_printf("%s modified %s...",
RANLIBMAG, Targ_FmtTime(modTimeTOC));
oodate = gn->youngestChild == NULL ||
gn->youngestChild->mtime > modTimeTOC;
} else {
/* A library without a table of contents is out-of-date. */
if (DEBUG(ARCH) || DEBUG(MAKE))
debug_printf("no toc...");
oodate = TRUE;
}
#else
oodate = FALSE;
#endif
}
return oodate;
}
/* Initialize the archives module. */
void
Arch_Init(void)
{
archives = Lst_New();
}
/* Clean up the archives module. */
void
Arch_End(void)
{
#ifdef CLEANUP
Lst_Destroy(archives, ArchFree);
#endif
}
Boolean
Arch_IsLib(GNode *gn)
{
static const char armag[] = "!<arch>\n";
char buf[sizeof armag - 1];
int fd;
if ((fd = open(gn->path, O_RDONLY)) == -1)
return FALSE;
if (read(fd, buf, sizeof buf) != sizeof buf) {
(void)close(fd);
return FALSE;
}
(void)close(fd);
return memcmp(buf, armag, sizeof buf) == 0;
}
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