434 lines
10 KiB
C
434 lines
10 KiB
C
/* $Id: msgcat.c,v 1.12 1998/01/15 09:58:08 jb Exp $ */
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/***********************************************************
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Copyright 1990, by Alfalfa Software Incorporated, Cambridge, Massachusetts.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that Alfalfa's name not be used in
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advertising or publicity pertaining to distribution of the software
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without specific, written prior permission.
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ALPHALPHA DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
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ALPHALPHA BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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SOFTWARE.
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If you make any modifications, bugfixes or other changes to this software
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we'd appreciate it if you could send a copy to us so we can keep things
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up-to-date. Many thanks.
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Kee Hinckley
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Alfalfa Software, Inc.
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267 Allston St., #3
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Cambridge, MA 02139 USA
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nazgul@alfalfa.com
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******************************************************************/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char *rcsid = "$NetBSD: msgcat.c,v 1.11 1995/02/27 13:06:51 cgd Exp $";
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#endif /* LIBC_SCCS and not lint */
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/* Edit History
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03/06/91 4 schulert remove working directory from nlspath
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01/18/91 2 hamilton #if not rescanned
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01/12/91 3 schulert conditionally use prototypes
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11/03/90 1 hamilton Alphalpha->Alfalfa & OmegaMail->Poste
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10/15/90 2 schulert > #include <unistd.h> if MIPS
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08/13/90 1 schulert move from ua to omu
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*/
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/*
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* We need a better way of handling errors than printing text. I need
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* to add an error handling routine.
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*/
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#include "nl_types.h"
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#include "msgcat.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#ifndef True
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# define True ~0
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# define False 0
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#endif
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/* take care of sysv diffs */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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#define NLERR ((nl_catd) -1)
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static nl_catd loadCat();
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static int loadSet();
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nl_catd _catopen( name, type)
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__const char *name;
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int type;
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{
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char path[MAXPATHLEN];
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__const char *catpath = NULL;
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char *nlspath;
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char *lang;
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long len;
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char *base, *cptr, *pathP;
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struct stat sbuf;
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if (!name || !*name) return(NLERR);
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if (strchr(name, '/')) {
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catpath = name;
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if (stat(catpath, &sbuf)) return(NLERR);
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} else {
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if ((lang = (char *) getenv("LANG")) == NULL)
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lang = "C";
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if ((nlspath = (char *) getenv("NLSPATH")) == NULL
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#ifndef __NETBSD_SYSCALLS
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|| issetugid()
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#endif
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)
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nlspath = "/usr/share/nls/%L/%N.cat:/usr/share/nls/%N/%L:/usr/local/share/nls/%L/%N.cat:/usr/local/share/nls/%N/%L";
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len = strlen(nlspath);
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base = cptr = malloc(len + 2);
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if (!base) return(NLERR);
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strcpy(cptr, nlspath);
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cptr[len] = ':';
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cptr[len+1] = '\0';
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for (nlspath = cptr; *cptr; ++cptr) {
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if (*cptr == ':') {
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*cptr = '\0';
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for (pathP = path; *nlspath; ++nlspath) {
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if (*nlspath == '%') {
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if (*(nlspath + 1) == 'L') {
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++nlspath;
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strcpy(pathP, lang);
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pathP += strlen(lang);
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} else if (*(nlspath + 1) == 'N') {
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++nlspath;
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strcpy(pathP, name);
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pathP += strlen(name);
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} else *(pathP++) = *nlspath;
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} else *(pathP++) = *nlspath;
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}
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*pathP = '\0';
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if (stat(path, &sbuf) == 0) {
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catpath = path;
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break;
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}
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nlspath = cptr+1;
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}
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}
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free(base);
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if (!catpath) return(NLERR);
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}
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return(loadCat(catpath, type));
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}
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/*
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* We've got an odd situation here. The odds are real good that the
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* number we are looking for is almost the same as the index. We could
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* use the index, check the difference and do something intelligent, but
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* I haven't quite figured out what's intelligent.
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*
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* Here's a start.
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* Take an id N. If there are > N items in the list, then N cannot
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* be more than N items from the start, since otherwise there would
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* have to be duplicate items. So we can safely set the top to N+1
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* (after taking into account that ids start at 1, and arrays at 0)
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*
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* Let's say we are at position P, and we are looking for N, but have
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* V. If N > V, then the furthest away that N could be is
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* P + (N-V). So we can safely set hi to P+(N-V)+1. For example:
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* We are looking for 10, but have 8
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* 8 ? ? ? ?
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* >=9 >=10 >=11
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*
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*/
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static MCSetT *MCGetSet( cat, setId)
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MCCatT *cat;
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int setId;
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{
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MCSetT *set;
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long lo, hi, cur, dir;
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if (!cat || setId <= 0) return(NULL);
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lo = 0;
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if (setId - 1 < cat->numSets) {
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cur = setId - 1;
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hi = setId;
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} else {
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hi = cat->numSets;
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cur = (hi - lo) / 2;
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}
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while (True) {
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set = cat->sets + cur;
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if (set->setId == setId) break;
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if (set->setId < setId) {
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lo = cur+1;
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if (hi > cur + (setId - set->setId) + 1) hi = cur+(setId-set->setId)+1;
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dir = 1;
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} else {
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hi = cur;
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dir = -1;
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}
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if (lo >= hi) return(NULL);
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if (hi - lo == 1) cur += dir;
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else cur += ((hi - lo) / 2) * dir;
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}
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if (set->invalid)
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(void) loadSet(cat, set);
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return(set);
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}
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static MCMsgT *MCGetMsg( set, msgId)
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MCSetT *set;
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int msgId;
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{
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MCMsgT *msg;
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long lo, hi, cur, dir;
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if (!set || set->invalid || msgId <= 0) return(NULL);
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lo = 0;
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if (msgId - 1 < set->numMsgs) {
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cur = msgId - 1;
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hi = msgId;
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} else {
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hi = set->numMsgs;
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cur = (hi - lo) / 2;
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}
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while (True) {
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msg = set->u.msgs + cur;
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if (msg->msgId == msgId) break;
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if (msg->msgId < msgId) {
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lo = cur+1;
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if (hi > cur + (msgId - msg->msgId) + 1) hi = cur+(msgId-msg->msgId)+1;
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dir = 1;
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} else {
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hi = cur;
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dir = -1;
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}
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if (lo >= hi) return(NULL);
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if (hi - lo == 1) cur += dir;
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else cur += ((hi - lo) / 2) * dir;
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}
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return(msg);
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}
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char *_catgets( catd, setId, msgId, dflt)
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nl_catd catd;
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int setId;
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int msgId;
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__const char *dflt;
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{
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MCMsgT *msg;
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MCCatT *cat = (MCCatT *) catd;
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__const char *cptr;
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msg = MCGetMsg(MCGetSet(cat, setId), msgId);
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if (msg) cptr = msg->msg.str;
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else cptr = dflt;
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return((char *)cptr);
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}
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int _catclose( catd)
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nl_catd catd;
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{
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MCCatT *cat = (MCCatT *) catd;
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MCSetT *set;
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int i;
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if (!cat) return -1;
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if (cat->loadType != MCLoadAll) close(cat->fd);
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for (i = 0; i < cat->numSets; ++i) {
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set = cat->sets + i;
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if (!set->invalid) {
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free(set->data.str);
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free(set->u.msgs);
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}
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}
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free(cat->sets);
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free(cat);
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return 0;
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}
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/*
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* Internal routines
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*/
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/* Note that only malloc failures are allowed to return an error */
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#define ERRNAME "Message Catalog System"
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#define CORRUPT() {fprintf(stderr, "%s: corrupt file.\n", ERRNAME); free(cat); return(NLERR);}
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#define NOSPACE() {fprintf(stderr, "%s: no more memory.\n", ERRNAME); free(cat); return(NLERR);}
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static nl_catd loadCat( catpath, type)
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__const char *catpath;
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int type;
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{
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MCHeaderT header;
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MCCatT *cat;
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MCSetT *set;
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long i, j;
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off_t nextSet;
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cat = (MCCatT *) malloc(sizeof(MCCatT));
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if (!cat) return(NLERR);
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cat->loadType = type;
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if ((cat->fd = open(catpath, O_RDONLY)) < 0) {
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free(cat);
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return(NLERR);
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}
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(void)fcntl(cat->fd, F_SETFD, FD_CLOEXEC);
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if (read(cat->fd, &header, sizeof(header)) != sizeof(header)) CORRUPT();
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if (strncmp(header.magic, MCMagic, MCMagicLen) != 0) CORRUPT();
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if (header.majorVer != MCMajorVer) {
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free(cat);
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fprintf(stderr, "%s: %s is version %ld, we need %ld.\n", ERRNAME,
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catpath, header.majorVer, MCMajorVer);
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return(NLERR);
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}
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if (header.numSets <= 0) {
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free(cat);
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fprintf(stderr, "%s: %s has %ld sets!\n", ERRNAME, catpath,
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header.numSets);
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return(NLERR);
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}
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cat->numSets = header.numSets;
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cat->sets = (MCSetT *) malloc(sizeof(MCSetT) * header.numSets);
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if (!cat->sets) NOSPACE();
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nextSet = header.firstSet;
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for (i = 0; i < cat->numSets; ++i) {
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if (lseek(cat->fd, nextSet, 0) == -1) {
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for (j = 0; j < i; j++) {
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set = cat->sets + j;
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if (!set->invalid) {
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free(set->data.str);
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free(set->u.msgs);
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}
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}
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free(cat->sets);
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CORRUPT();
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}
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/* read in the set header */
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set = cat->sets + i;
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if (read(cat->fd, set, sizeof(*set)) != sizeof(*set)) {
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for (j = 0; j < i; j++) {
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set = cat->sets + j;
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if (!set->invalid) {
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free(set->data.str);
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free(set->u.msgs);
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}
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}
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free(cat->sets);
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CORRUPT();
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}
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/* if it's invalid, skip over it (and backup 'i') */
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if (set->invalid) {
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--i;
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nextSet = set->nextSet;
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continue;
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}
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if (cat->loadType == MCLoadAll) {
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int res;
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if ((res = loadSet(cat, set)) <= 0) {
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for (j = 0; j < i; j++) {
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set = cat->sets + j;
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if (!set->invalid) {
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free(set->data.str);
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free(set->u.msgs);
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}
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}
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free(cat->sets);
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if (res < 0) NOSPACE();
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CORRUPT();
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}
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} else set->invalid = True;
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nextSet = set->nextSet;
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}
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if (cat->loadType == MCLoadAll) {
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close(cat->fd);
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cat->fd = -1;
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}
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return((nl_catd) cat);
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}
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static int loadSet(cat, set)
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MCCatT *cat;
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MCSetT *set;
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{
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MCMsgT *msg;
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int i;
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/* Get the data */
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if (lseek(cat->fd, set->data.off, 0) == -1) return(0);
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if ((set->data.str = malloc(set->dataLen)) == NULL) return(-1);
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if (read(cat->fd, set->data.str, set->dataLen) != set->dataLen) {
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free(set->data.str); return(0);
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}
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/* Get the messages */
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if (lseek(cat->fd, set->u.firstMsg, 0) == -1) {
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free(set->data.str); return(0);
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}
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if ((set->u.msgs = (MCMsgT *) malloc(sizeof(MCMsgT) * set->numMsgs)) == NULL) {
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free(set->data.str); return(-1);
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}
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for (i = 0; i < set->numMsgs; ++i) {
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msg = set->u.msgs + i;
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if (read(cat->fd, msg, sizeof(*msg)) != sizeof(*msg)) {
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free(set->u.msgs); free(set->data.str); return(0);
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}
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if (msg->invalid) {
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--i;
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continue;
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}
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msg->msg.str = (char *) (set->data.str + msg->msg.off);
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}
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set->invalid = False;
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return(1);
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}
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