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