File: [local] / src / usr.bin / make / arch.c (download)
Revision 1.37, Fri Nov 24 14:36:33 2000 UTC (23 years, 6 months ago) by espie
Branch: MAIN
Changes since 1.36: +45 -62 lines
Change the time stamp interface to use an abstract datatype.
Define two possible interfaces: the classic one,
and the new one (used where available) that depends on timespec.
Better granularity, make is now able to distinguish between files that
were built during the same second.
|
/* $OpenBSD: arch.c,v 1.37 2000/11/24 14:36:33 espie Exp $ */
/* $NetBSD: arch.c,v 1.17 1996/11/06 17:58:59 christos Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1993
* The Regents of the University of California. All rights reserved.
* 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.
*/
/*-
* arch.c --
* Functions to manipulate libraries, archives and their members.
*
* Once again, cacheing/hashing comes into play in the manipulation
* of archives. The first time an archive is referenced, all of its members'
* headers are read and hashed and the archive closed again. All hashed
* archives are kept on a list which is searched each time an archive member
* is referenced.
*
* The interface to this module is:
* Arch_ParseArchive Given an archive specification, return a list
* of GNode's, one for each member in the spec.
* FAILURE is returned if the specification is
* invalid for some reason.
*
* Arch_Touch Alter the modification time of the archive
* member described by the given node to be
* the current time.
*
* 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_MTime Find the modification time of a member of
* an archive *in the archive*, return TRUE if
* exists. The time is placed in the member's
* GNode. Returns the modification time.
*
* Arch_MemMTime 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 Special function to decide if a library node
* is out-of-date.
*
* Arch_Init Initialize this module.
*
* Arch_End Cleanup this module.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/param.h>
#include <stddef.h>
#include <ctype.h>
#include <ar.h>
#include <utime.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include "make.h"
#include "ohash.h"
#include "dir.h"
#include "config.h"
#ifndef lint
#if 0
static char sccsid[] = "@(#)arch.c 8.2 (Berkeley) 1/2/94";
#else
UNUSED
static char rcsid[] = "$OpenBSD: arch.c,v 1.37 2000/11/24 14:36:33 espie Exp $";
#endif
#endif /* not lint */
#ifdef TARGET_MACHINE
#undef MACHINE
#define MACHINE TARGET_MACHINE
#endif
#ifdef TARGET_MACHINE_ARCH
#undef MACHINE_ARCH
#define MACHINE_ARCH TARGET_MACHINE_ARCH
#endif
static LIST archives; /* Lst of archives we've already examined */
typedef struct Arch_ {
char *name; /* Name of archive */
struct hash members; /* All the members of this archive, as
* struct arch_member entries. */
char *fnametab; /* Extended name table strings */
size_t fnamesize; /* Size of the string table */
} Arch;
/* Used to get to ar's field sizes. */
static struct ar_hdr *dummy;
#define AR_NAME_SIZE (sizeof(dummy->ar_name))
#define AR_DATE_SIZE (sizeof(dummy->ar_date))
/* Each archive member is tied to an arch_member structure,
* suitable for hashing. */
struct arch_member {
TIMESTAMP mtime; /* Member modification date. */
char date[AR_DATE_SIZE+1];
/* Same, before conversion to numeric value. */
char name[1]; /* Member name. */
};
static struct hash_info members_info = {
offsetof(struct arch_member, name), NULL,
hash_alloc, hash_free, element_alloc
};
static struct arch_member *new_arch_member __P((struct ar_hdr *, const char *));
static TIMESTAMP mtime_of_member __P((struct arch_member *));
static int ArchFindArchive __P((void *, void *));
#ifdef CLEANUP
static void ArchFree __P((void *));
#endif
static TIMESTAMP ArchMTimeMember __P((char *, char *, Boolean));
static FILE *ArchFindMember __P((char *, char *, struct ar_hdr *, char *));
#if defined(__svr4__) || defined(__SVR4) || \
(defined(__OpenBSD__) && defined(__mips__)) || \
(defined(__OpenBSD__) && defined(__powerpc))
#define SVR4ARCHIVES
static int ArchSVR4Entry __P((Arch *, char *, size_t, FILE *));
#endif
static struct arch_member *
new_arch_member(hdr, name)
struct ar_hdr *hdr;
const char *name;
{
const char *end = NULL;
struct arch_member *n;
n = hash_create_entry(&members_info, name, &end);
/* XXX ar entries are NOT null terminated. */
memcpy(n->date, &(hdr->ar_date), AR_DATE_SIZE);
n->date[AR_DATE_SIZE] = '\0';
/* Don't compute mtime before it is needed. */
set_out_of_date(n->mtime);
return n;
}
static TIMESTAMP
mtime_of_member(m)
struct arch_member *m;
{
if (is_out_of_date(m->mtime))
grab_date((time_t) strtol(m->date, NULL, 10), m->mtime);
return m->mtime;
}
#ifdef CLEANUP
/*-
*-----------------------------------------------------------------------
* ArchFree --
* Free memory used by an archive
*
* Results:
* None.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
static void
ArchFree(ap)
void *ap;
{
Arch *a = (Arch *) ap;
struct arch_member *mem;
unsigned i;
/* Free memory from hash entries */
for (mem = hash_first(&a->members, &i); mem != NULL;
mem = hash_next(&a->members, &i))
free(mem);
free(a->name);
efree(a->fnametab);
hash_delete(&a->members);
free(a);
}
#endif
/*-
*-----------------------------------------------------------------------
* Arch_ParseArchive --
* Parse the archive specification in the given line and find/create
* the nodes for the specified archive members, placing their nodes
* on the given list.
*
* Results:
* SUCCESS if it was a valid specification. The linePtr is updated
* to point to the first non-space after the archive spec. The
* nodes for the members are placed on the given list.
*
* Side Effects:
* Some nodes may be created. The given list is extended.
*
*-----------------------------------------------------------------------
*/
ReturnStatus
Arch_ParseArchive(linePtr, nodeLst, ctxt)
char **linePtr; /* Pointer to start of specification */
Lst nodeLst; /* Lst on which to place the nodes */
SymTable *ctxt; /* Context in which to expand variables */
{
register char *cp; /* Pointer into line */
GNode *gn; /* New node */
char *libName; /* Library-part of specification */
char *memName; /* Member-part of specification */
char nameBuf[MAKE_BSIZE]; /* temporary place for node name */
char saveChar; /* Ending delimiter of member-name */
Boolean subLibName; /* TRUE if libName should have/had
* variable substitution performed on it */
libName = *linePtr;
subLibName = FALSE;
for (cp = libName; *cp != '(' && *cp != '\0'; cp++) {
if (*cp == '$') {
/*
* Variable spec, so call the Var module to parse the puppy
* so we can safely advance beyond it...
*/
size_t length;
Boolean freeIt;
char *result;
result=Var_Parse(cp, ctxt, TRUE, &length, &freeIt);
if (result == var_Error) {
return(FAILURE);
} else {
subLibName = TRUE;
}
if (freeIt) {
free(result);
}
cp += length-1;
}
}
*cp++ = '\0';
if (subLibName) {
libName = Var_Subst(libName, ctxt, TRUE);
}
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 */
while (*cp != '\0' && *cp != ')' && isspace (*cp)) {
cp++;
}
memName = cp;
while (*cp != '\0' && *cp != ')' && !isspace (*cp)) {
if (*cp == '$') {
/*
* Variable spec, so call the Var module to parse the puppy
* so we can safely advance beyond it...
*/
size_t length;
Boolean freeIt;
char *result;
result=Var_Parse(cp, ctxt, TRUE, &length, &freeIt);
if (result == var_Error) {
return(FAILURE);
} else {
doSubst = TRUE;
}
if (freeIt) {
free(result);
}
cp += length;
} else {
cp++;
}
}
/*
* If the specification ends without a closing parenthesis,
* chances are there's something wrong (like a missing backslash),
* so it's better to return failure than allow such things to happen
*/
if (*cp == '\0') {
printf("No closing parenthesis in archive specification\n");
return (FAILURE);
}
/*
* If we didn't move anywhere, we must be done
*/
if (cp == memName) {
break;
}
saveChar = *cp;
*cp = '\0';
/*
* XXX: This should be taken care of intelligently by
* SuffExpandChildren, both for the archive and the member portions.
*/
/*
* If member contains variables, try and substitute for them.
* This will slow down archive specs with dynamic sources, of course,
* since we'll be (non-)substituting them three times, but them's
* the breaks -- we need to do this since SuffExpandChildren calls
* us, otherwise we could assume the thing would be taken care of
* later.
*/
if (doSubst) {
char *buf;
char *sacrifice;
char *oldMemName = memName;
memName = Var_Subst(memName, ctxt, TRUE);
/*
* Now form an archive spec and recurse to deal with nested
* variables and multi-word variable values.... The results
* are just placed at the end of the nodeLst we're returning.
*/
buf = sacrifice = emalloc(strlen(memName)+strlen(libName)+3);
sprintf(buf, "%s(%s)", libName, memName);
if (strchr(memName, '$') && 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_FindNode(buf, TARG_CREATE);
if (gn == NULL) {
free(buf);
return(FAILURE);
} else {
gn->type |= OP_ARCHV;
Lst_AtEnd(nodeLst, gn);
}
} else if (Arch_ParseArchive(&sacrifice, nodeLst, ctxt)!=SUCCESS) {
/*
* Error in nested call -- free buffer and return FAILURE
* ourselves.
*/
free(buf);
return(FAILURE);
}
/*
* Free buffer and continue with our work.
*/
free(buf);
} else if (Dir_HasWildcards(memName)) {
LIST members;
char *member;
Lst_Init(&members);
Dir_Expand(memName, &dirSearchPath, &members);
while ((member = (char *)Lst_DeQueue(&members)) != NULL) {
sprintf(nameBuf, "%s(%s)", libName, member);
free(member);
gn = Targ_FindNode(nameBuf, TARG_CREATE);
if (gn == NULL)
return (FAILURE);
else {
/*
* 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_AtEnd(nodeLst, gn);
}
}
Lst_Destroy(&members, NOFREE);
} else {
sprintf(nameBuf, "%s(%s)", libName, memName);
gn = Targ_FindNode (nameBuf, TARG_CREATE);
if (gn == NULL) {
return (FAILURE);
} else {
/*
* 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_AtEnd(nodeLst, gn);
}
}
if (doSubst) {
free(memName);
}
*cp = saveChar;
}
/*
* If substituted libName, free it now, since we need it no longer.
*/
if (subLibName) {
free(libName);
}
/*
* We promised the pointer would be set up at the next non-space, so
* we must advance cp there before setting *linePtr... (note that on
* entrance to the loop, cp is guaranteed to point at a ')')
*/
do {
cp++;
} while (*cp != '\0' && isspace (*cp));
*linePtr = cp;
return (SUCCESS);
}
/*-
*-----------------------------------------------------------------------
* ArchFindArchive --
* See if the given archive is the one we are looking for. Called
* From ArchMTimeMember and ArchFindMember via Lst_Find.
*
* Results:
* 0 if it is, non-zero if it isn't.
*-----------------------------------------------------------------------
*/
static int
ArchFindArchive(ar, archName)
void *ar; /* Current list element */
void *archName; /* Name we want */
{
return strcmp ((char *)archName, ((Arch *)ar)->name);
}
/*-
*-----------------------------------------------------------------------
* ArchMTimeMember --
* Locate a member of an archive, given the path of the archive and
* the path of the desired member.
*
* Results:
* A pointer to the current struct ar_hdr structure for the member. Note
* That no position is returned, so this is not useful for touching
* archive members. This is mostly because we have no assurances that
* The archive will remain constant after we read all the headers, so
* there's not much point in remembering the position...
*
* Side Effects:
*
*-----------------------------------------------------------------------
*/
static TIMESTAMP
ArchMTimeMember(archive, member, hash)
char *archive; /* Path to the archive */
char *member; /* Name of member. If it is a path, only the
* last component is used. */
Boolean hash; /* TRUE if archive should be hashed if not
* already so. */
{
#define AR_MAX_NAME_LEN (sizeof(arh.ar_name)-1)
FILE * arch; /* Stream to archive */
int size; /* Size of archive member */
char *cp; /* Useful character pointer */
char magic[SARMAG];
LstNode ln; /* Lst member containing archive descriptor */
Arch *ar; /* Archive descriptor */
struct arch_member *he; /* Entry containing member's description */
struct ar_hdr arh; /* archive-member header for reading archive */
char memName[MAXPATHLEN+1];
/* Current member name while hashing. */
const char *end = NULL;
TIMESTAMP result;
set_out_of_date(result);
/*
* Because of space constraints and similar things, files are archived
* using their final path components, not the entire thing, so we need
* to point 'member' to the final component, if there is one, to make
* the comparisons easier...
*/
cp = strrchr(member, '/');
if (cp != NULL)
member = cp + 1;
ln = Lst_Find(&archives, ArchFindArchive, archive);
if (ln != NULL) {
ar = (Arch *)Lst_Datum(ln);
end = NULL;
he = hash_find(&ar->members, hash_qlookupi(&ar->members, member, &end));
if (he != NULL)
return mtime_of_member(he);
else {
if (end - member > AR_NAME_SIZE) {
/* Try truncated name */
end = member + AR_NAME_SIZE;
he = hash_find(&ar->members,
hash_qlookupi(&ar->members, member, &end));
if (he != NULL)
return mtime_of_member(he);
}
return result;
}
}
if (!hash) {
/*
* Caller doesn't want the thing hashed, just use ArchFindMember
* to read the header for the member out and close down the stream
* again. Since the archive is not to be hashed, 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 result;
else {
fclose(arch);
grab_date( (time_t)strtol(sarh.ar_date, NULL, 10), result);
return result;
}
}
/*
* 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 result;
/*
* 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 result;
}
ar = (Arch *)emalloc(sizeof (Arch));
ar->name = estrdup(archive);
ar->fnametab = NULL;
ar->fnamesize = 0;
hash_init(&ar->members, 8, &members_info);
memName[AR_MAX_NAME_LEN] = '\0';
while (fread((char *)&arh, sizeof (struct ar_hdr), 1, arch) == 1) {
if (strncmp( arh.ar_fmag, ARFMAG, sizeof (arh.ar_fmag)) != 0) {
/*
* The header is bogus, so the archive is bad
* and there's no way we can recover...
*/
goto badarch;
} else {
/*
* 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 = (int) strtol(arh.ar_size, NULL, 10);
(void) strncpy(memName, arh.ar_name, sizeof(arh.ar_name));
for (cp = &memName[AR_MAX_NAME_LEN]; *cp == ' '; cp--) {
continue;
}
cp[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 (cp[0] == '/')
cp[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 &&
isdigit(memName[sizeof(AR_EFMT1) - 1])) {
unsigned int elen = atoi(&memName[sizeof(AR_EFMT1)-1]);
if (elen > MAXPATHLEN)
goto badarch;
if (fread (memName, elen, 1, arch) != 1)
goto badarch;
memName[elen] = '\0';
fseek(arch, -elen, SEEK_CUR);
if (DEBUG(ARCH) || DEBUG(MAKE)) {
printf("ArchStat: Extended format entry for %s\n", memName);
}
}
#endif
hash_insert(&ar->members,
hash_qlookup(&ar->members, memName),
new_arch_member(&arh, memName));
}
fseek(arch, (size + 1) & ~1, SEEK_CUR);
}
fclose(arch);
Lst_AtEnd(&archives, ar);
/*
* Now that the archive has been read and cached, we can look into
* the hash table to find the desired member's header.
*/
he = hash_find(&ar->members,
hash_qlookupi(&ar->members, member, &end));
if (he != NULL)
return mtime_of_member(he);
else
return result;
badarch:
fclose(arch);
hash_delete(&ar->members);
efree(ar->fnametab);
free(ar);
return result;
}
#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.
*
* 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
*
* Side Effects:
* If a table is read, the file pointer is moved to the next archive
* member
*
*-----------------------------------------------------------------------
*/
static int
ArchSVR4Entry(ar, name, size, arch)
Arch *ar;
char *name;
size_t size;
FILE *arch;
{
#define ARLONGNAMES1 "//"
#define ARLONGNAMES2 "/ARFILENAMES"
size_t entry;
char *ptr, *eptr;
if (strncmp(name, ARLONGNAMES1, sizeof(ARLONGNAMES1) - 1) == 0 ||
strncmp(name, ARLONGNAMES2, sizeof(ARLONGNAMES2) - 1) == 0) {
if (ar->fnametab != NULL) {
if (DEBUG(ARCH)) {
printf("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 = emalloc(size);
ar->fnamesize = size;
if (fread(ar->fnametab, size, 1, arch) != 1) {
if (DEBUG(ARCH)) {
printf("Reading an SVR4 name table failed\n");
}
return -1;
}
eptr = ar->fnametab + size;
for (entry = 0, ptr = ar->fnametab; ptr < eptr; ptr++)
switch (*ptr) {
case '/':
entry++;
*ptr = '\0';
break;
case '\n':
break;
default:
break;
}
if (DEBUG(ARCH)) {
printf("Found svr4 archive name table with %lu entries\n",
(u_long)entry);
}
return 0;
}
if (name[1] == ' ' || name[1] == '\0')
return 2;
entry = (size_t) strtol(&name[1], &eptr, 0);
if ((*eptr != ' ' && *eptr != '\0') || eptr == &name[1]) {
if (DEBUG(ARCH)) {
printf("Could not parse SVR4 name %s\n", name);
}
return 2;
}
if (entry >= ar->fnamesize) {
if (DEBUG(ARCH)) {
printf("SVR4 entry offset %s is greater than %lu\n",
name, (u_long)ar->fnamesize);
}
return 2;
}
if (DEBUG(ARCH)) {
printf("Replaced %s with %s\n", name, &ar->fnametab[entry]);
}
(void) strncpy(name, &ar->fnametab[entry], MAXPATHLEN);
name[MAXPATHLEN] = '\0';
return 1;
}
#endif
/*-
*-----------------------------------------------------------------------
* ArchFindMember --
* Locate a member of an archive, given the path of the archive and
* the path of the desired member. If the archive is to be modified,
* the mode should be "r+", if not, it should be "r".
*
* Results:
* An FILE *, opened for reading and writing, positioned at the
* start of the member's struct ar_hdr, or NULL if the member was
* nonexistent. The current struct ar_hdr for member.
*
* Side Effects:
* The passed struct ar_hdr structure is filled in.
*
*-----------------------------------------------------------------------
*/
static FILE *
ArchFindMember (archive, member, arhPtr, mode)
char *archive; /* Path to the archive */
char *member; /* Name of member. If it is a path, only the
* last component is used. */
struct ar_hdr *arhPtr; /* Pointer to header structure to be filled in */
char *mode; /* The mode for opening the stream */
{
FILE * arch; /* Stream to archive */
int size; /* Size of archive member */
char *cp; /* Useful character pointer */
char magic[SARMAG];
int len, tlen;
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 final path components, not the entire thing, so we need
* to point 'member' to the final component, if there is one, to make
* the comparisons easier...
*/
cp = strrchr (member, '/');
if (cp != (char *) NULL) {
member = cp + 1;
}
len = tlen = strlen (member);
if (len > sizeof (arhPtr->ar_name)) {
tlen = sizeof (arhPtr->ar_name);
}
while (fread ((char *)arhPtr, sizeof (struct ar_hdr), 1, arch) == 1) {
if (strncmp(arhPtr->ar_fmag, ARFMAG, sizeof (arhPtr->ar_fmag) ) != 0) {
/*
* The header is bogus, so the archive is bad
* and there's no way we can recover...
*/
fclose (arch);
return (NULL);
} else if (strncmp (member, arhPtr->ar_name, tlen) == 0) {
/*
* If the member's name doesn't take up the entire 'name' field,
* we have to be careful of matching prefixes. Names are space-
* padded to the right, so if the character in 'name' at the end
* of the matched string is anything but a space, this isn't the
* member we sought.
*/
if (tlen != sizeof(arhPtr->ar_name) && arhPtr->ar_name[tlen] != ' '){
goto skip;
} else {
/*
* To make life easier, 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...
*/
fseek (arch, -sizeof(struct ar_hdr), SEEK_CUR);
return (arch);
}
} else
#ifdef AR_EFMT1
/*
* BSD 4.4 extended AR format: #1/<namelen>, with name as the
* first <namelen> bytes of the file
*/
if (strncmp(arhPtr->ar_name, AR_EFMT1,
sizeof(AR_EFMT1) - 1) == 0 &&
isdigit(arhPtr->ar_name[sizeof(AR_EFMT1) - 1])) {
unsigned int elen = atoi(&arhPtr->ar_name[sizeof(AR_EFMT1)-1]);
char ename[MAXPATHLEN];
if (elen > MAXPATHLEN) {
fclose (arch);
return NULL;
}
if (fread (ename, elen, 1, arch) != 1) {
fclose (arch);
return NULL;
}
ename[elen] = '\0';
if (DEBUG(ARCH) || DEBUG(MAKE)) {
printf("ArchFind: Extended format entry for %s\n", ename);
}
if (strncmp(ename, member, len) == 0) {
/* Found as extended name */
fseek (arch, -sizeof(struct ar_hdr) - elen, SEEK_CUR);
return (arch);
}
fseek (arch, -elen, SEEK_CUR);
goto skip;
} else
#endif
{
skip:
/*
* 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.
*/
arhPtr->ar_size[sizeof(arhPtr->ar_size)-1] = '\0';
size = (int) strtol(arhPtr->ar_size, NULL, 10);
fseek (arch, (size + 1) & ~1, SEEK_CUR);
}
}
/*
* We've looked everywhere, but the member is not to be found. Close the
* archive and return NULL -- an error.
*/
fclose (arch);
return (NULL);
}
/*-
*-----------------------------------------------------------------------
* Arch_Touch --
* Touch a member of an archive.
*
* Results:
* The 'time' field of the member's header is updated.
*
* Side Effects:
* The modification time of the entire archive is also changed.
* For a library, this could necessitate the re-ranlib'ing of the
* whole thing.
*
*-----------------------------------------------------------------------
*/
void
Arch_Touch (gn)
GNode *gn; /* Node of member to touch */
{
FILE * arch; /* Stream open to archive, positioned properly */
struct ar_hdr arh; /* Current header describing member */
arch = ArchFindMember(Varq_Value(ARCHIVE_INDEX, gn),
Varq_Value(MEMBER_INDEX, gn),
&arh, "r+");
sprintf(arh.ar_date, "%-12ld", (long) timestamp2time_t(now));
if (arch != NULL) {
(void)fwrite ((char *)&arh, sizeof (struct ar_hdr), 1, arch);
fclose (arch);
}
}
/*-
*-----------------------------------------------------------------------
* Arch_TouchLib --
* Given a node which represents a library, touch the thing, making
* sure that the table of contents also is touched.
*
* Results:
* None.
*
* Side Effects:
* Both the modification time of the library and of the RANLIBMAG
* member are set to 'now'.
*
*-----------------------------------------------------------------------
*/
void
Arch_TouchLib (gn)
GNode *gn; /* The node of the library to touch */
{
#ifdef RANLIBMAG
FILE * arch; /* Stream open to archive */
struct ar_hdr arh; /* Header describing table of contents */
arch = ArchFindMember (gn->path, RANLIBMAG, &arh, "r+");
sprintf(arh.ar_date, "%-12ld", (long) timestamp2time_t(now));
if (arch != NULL) {
(void)fwrite ((char *)&arh, sizeof (struct ar_hdr), 1, arch);
fclose (arch);
set_times(gn->path);
}
#endif
}
/*-
*-----------------------------------------------------------------------
* Arch_MTime --
* Return the modification time of a member of an archive.
*
* Results:
* The modification time (seconds).
*
* Side Effects:
* The mtime field of the given node is filled in with the value
* returned by the function.
*-----------------------------------------------------------------------
*/
TIMESTAMP
Arch_MTime(gn)
GNode *gn; /* Node describing archive member */
{
gn->mtime = ArchMTimeMember(Varq_Value(ARCHIVE_INDEX, gn),
Varq_Value(MEMBER_INDEX, gn),
TRUE);
return gn->mtime;
}
/*-
*-----------------------------------------------------------------------
* Arch_MemMTime --
* Given a non-existent archive member's node, get its modification
* time from its archived form, if it exists.
*
*-----------------------------------------------------------------------
*/
TIMESTAMP
Arch_MemMTime (gn)
GNode *gn;
{
LstNode ln;
for (ln = Lst_First(&gn->parents); ln != NULL; ln = Lst_Adv(ln)) {
GNode *pgn;
char *nameStart,
*nameEnd;
pgn = (GNode *)Lst_Datum(ln);
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... */
if ((nameStart = strchr(pgn->name, '(') ) != NULL) {
nameStart++;
nameEnd = strchr(nameStart, ')');
} else
nameEnd = NULL;
if (pgn->make && nameEnd != NULL &&
strncmp(nameStart, gn->name, nameEnd - nameStart) == 0 &&
gn->name[nameEnd-nameStart] == '\0')
gn->mtime = Arch_MTime(pgn);
} else if (pgn->make) {
/* Something which isn't a library depends on the existence of
* this target, so it needs to exist. */
set_out_of_date(gn->mtime);
break;
}
}
return gn->mtime;
}
/*-
*-----------------------------------------------------------------------
* Arch_FindLib --
* Search for a library along the given search path.
*
* Results:
* None.
*
* Side Effects:
* 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 .LIBRARIES 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.
*
*-----------------------------------------------------------------------
*/
void
Arch_FindLib (gn, path)
GNode *gn; /* Node of library to find */
Lst path; /* Search path */
{
char *libName; /* file name for archive */
libName = (char *)emalloc (strlen (gn->name) + 6 - 2);
sprintf(libName, "lib%s.a", &gn->name[2]);
gn->path = Dir_FindFile (libName, path);
free (libName);
#ifdef LIBRARIES
Varq_Set(TARGET_INDEX, gn->name, gn);
#else
Varq_Set(TARGET_INDEX, gn->path == NULL ? gn->name : gn->path, gn);
#endif /* LIBRARIES */
}
/*-
*-----------------------------------------------------------------------
* Arch_LibOODate --
* Decide if a node with the OP_LIB attribute is out-of-date. Called
* from Make_OODate to make its life easier.
*
* 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->cmtime).
* 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 of 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.
*
* Results:
* TRUE if the library is out-of-date. FALSE otherwise.
*
* Side Effects:
* The library will be hashed if it hasn't been already.
*
*-----------------------------------------------------------------------
*/
Boolean
Arch_LibOODate (gn)
GNode *gn; /* The library's graph node */
{
TIMESTAMP modTimeTOC; /* mod time of __.SYMDEF */
if (OP_NOP(gn->type) && Lst_IsEmpty(&gn->children))
return FALSE;
if (is_before(now, gn->mtime) || is_before(gn->mtime, gn->cmtime) ||
is_out_of_date(gn->mtime))
return TRUE;
#ifdef RANLIBMAG
/* non existent libraries are always out-of-date. */
if (gn->path == NULL)
return TRUE;
modTimeTOC = ArchMTimeMember(gn->path, RANLIBMAG, FALSE);
if (!is_out_of_date(modTimeTOC)) {
if (DEBUG(ARCH) || DEBUG(MAKE))
printf("%s modified %s...", RANLIBMAG, Targ_FmtTime(modTimeTOC));
return is_before(modTimeTOC, gn->cmtime);
}
/* A library w/o a table of contents is out-of-date */
if (DEBUG(ARCH) || DEBUG(MAKE))
printf("No t.o.c....");
return TRUE;
#else
return FALSE;
#endif
}
/*-
*-----------------------------------------------------------------------
* Arch_Init --
* Initialize things for this module.
*
* Side Effects:
* The 'archives' list is initialized.
*
*-----------------------------------------------------------------------
*/
void
Arch_Init()
{
Lst_Init(&archives);
}
/*-
*-----------------------------------------------------------------------
* Arch_End --
* Cleanup things for this module.
*
* Results:
* None.
*
* Side Effects:
* The 'archives' list is freed
*
*-----------------------------------------------------------------------
*/
void
Arch_End ()
{
#ifdef CLEANUP
Lst_Destroy(&archives, ArchFree);
#endif
}
/*-
*-----------------------------------------------------------------------
* Arch_IsLib --
* Check if the node is a library
*
* Results:
* True or False.
*
* Side Effects:
* None.
*
*-----------------------------------------------------------------------
*/
int
Arch_IsLib(gn)
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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