/* $Id: record.c,v 1.3 2002/04/15 20:00:22 in2 Exp $ */
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/file.h>
#include "config.h"
#include "pttstruct.h"
#include "modes.h"
#include "proto.h"

#undef  HAVE_MMAP
#define BUFSIZE 512

extern char *str_reply;

static void PttLock(int fd, int size, int mode) {
    static struct flock lock_it;
    int ret;

    lock_it.l_whence = SEEK_CUR;        /* from current point */
    lock_it.l_start = 0;                /* -"- */
    lock_it.l_len = size;               /* length of data */
    lock_it.l_type = mode;              /* set exclusive/write lock */
    lock_it.l_pid = 0;                  /* pid not actually interesting */
    while((ret = fcntl(fd, F_SETLKW, &lock_it)) < 0 && errno == EINTR);
}

#define safewrite       write

int get_num_records(char *fpath, int size) {
    struct stat st;
    if(stat(fpath, &st) == -1)
	return 0;
    return st.st_size / size;
}

int get_sum_records(char* fpath, int size) {
    struct stat st;
    long ans = 0;
    FILE* fp;
    fileheader_t fhdr;
    char buf[200], *p;

    if(!(fp = fopen(fpath, "r")))
	return -1;
    
    strcpy(buf, fpath);
    p = strrchr(buf, '/') + 1;
    
    while(fread(&fhdr, size, 1, fp) == 1) {
	strcpy(p, fhdr.filename);
	if(stat(buf, &st) == 0 && S_ISREG(st.st_mode) && st.st_nlink == 1)
	    ans += st.st_size;
    }
    fclose(fp);
    return ans / 1024;
}

int get_record(char *fpath, void *rptr, int size, int id) {
    int fd = -1;
    
    if(id < 1 || (fd = open(fpath, O_RDONLY, 0)) != -1) {
	if(lseek(fd, (off_t)(size * (id - 1)), SEEK_SET) != -1) {
	    if(read(fd, rptr, size) == size) {
		close(fd);
		return 0;
	    }
	}
	close(fd);
    }
    return -1;
}

int get_records(char *fpath, void *rptr, int size, int id, int number) {
    int fd;
    
    if(id < 1 || (fd = open(fpath, O_RDONLY, 0)) == -1)
	return -1;

    if(lseek(fd, (off_t)(size * (id - 1)), SEEK_SET) == -1) {
	close(fd);
	return 0;
    }
    if((id = read(fd, rptr, size * number)) == -1) {
	close(fd);
	return -1;
    }
    close(fd);
    return id / size;
}

int substitute_record(char *fpath, void *rptr, int size, int id) {
    int fd;

    if(id < 1 || (fd = open(fpath, O_WRONLY | O_CREAT, 0644)) == -1)
	return -1;
    
    lseek(fd, (off_t) (size * (id - 1)), SEEK_SET);
    PttLock(fd, size, F_WRLCK);
    safewrite(fd, rptr, size);
    PttLock(fd, size, F_UNLCK);
    close(fd);
    
    return 0;
}

/* rocker.011022: 避免lock檔開啟時不正常斷線,造成永久lock */
static int
force_open (char *fname)
{
  int fd;
  time_t expire;

  expire = time(NULL) - 3600; /* lock 存在超過一個小時就是有問題! */
  
  if (dasht (fname) < expire) return -1;
  unlink(fname);
  fd = open (fname, O_WRONLY|O_TRUNC, 0644);

  return fd;
}


#if !defined(_BBS_UTIL_C_)
/* new/old/lock file processing */
typedef struct nol_t {
    char newfn[256];
    char oldfn[256];
    char lockfn[256];
} nol_t;

static void nolfilename(nol_t *n, char *fpath) {
    sprintf(n->newfn, "%s.new", fpath);
    sprintf(n->oldfn, "%s.old", fpath);
    sprintf(n->lockfn, "%s.lock", fpath);
}

int delete_record(char fpath[], int size, int id) {
    nol_t my;
    char abuf[BUFSIZE];
    int fdr, fdw, fd;
    int count;
    
    nolfilename(&my, fpath);
    if((fd = open(my.lockfn, O_RDWR | O_CREAT | O_APPEND, 0644)) == -1)
	return -1;

    flock(fd, LOCK_EX);

    if((fdr = open(fpath, O_RDONLY, 0)) == -1) {
	move(10,10);
	outs("delete_record failed!!! (open)");
	pressanykey();
	flock(fd, LOCK_UN);
	close(fd);
	return -1;
    }

    if(
   	((fdw = open(my.newfn, O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1) && 
       	((fdw = force_open (my.newfn)) == -1)) {
	flock(fd, LOCK_UN);
	close(fd);
	close(fdr);
	return -1;
    }
    count = 1;
    while(read(fdr, abuf, size) == size) {
	if(id != count++ && (safewrite(fdw, abuf, size) == -1)) {
	    unlink(my.newfn);
	    close(fdr);
	    close(fdw);
	    flock(fd, LOCK_UN);
	    close(fd);
	    return -1;
	}
    }
    close(fdr);
    close(fdw);
    if(Rename(fpath, my.oldfn) == -1 || Rename(my.newfn, fpath) == -1) {
	flock(fd, LOCK_UN);
	close(fd);
	return -1;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

#if 0
static char *title_body(char *title) {
    if(!strncasecmp(title, str_reply, 3)) {
	title += 3;
	if(*title == ' ')
	    title++;
    }
    return title;
}
#endif

int delete_range(char *fpath, int id1, int id2) {
    fileheader_t fhdr;
    nol_t my;
    char fullpath[STRLEN], *t;
    int fdr, fdw, fd;
    int count;
    extern int Tagger();
    
    nolfilename(&my, fpath);
    
    if((fd = open(my.lockfn, O_RDWR | O_CREAT | O_APPEND, 0644)) == -1)
	return -1;

    flock(fd, LOCK_EX);

    if((fdr = open(fpath, O_RDONLY, 0)) == -1) {
	flock(fd, LOCK_UN);
	close(fd);
	return -1;
    }
    
    if(
	((fdw = open(my.newfn, O_WRONLY | O_CREAT | O_EXCL, 0644)) == -1) &&
	((fdw = force_open (my.newfn)) == -1)) {
	close(fdr);
	flock(fd, LOCK_UN);
	close(fd);
	return -1;
    }
    
    count = 1;
    strcpy(fullpath, fpath);
    t = strrchr(fullpath, '/') + 1;

    while(read(fdr, &fhdr, sizeof(fileheader_t)) == sizeof(fileheader_t)) 
    {
	strcpy(t, fhdr.filename);

/* rocker.011018: add new tag delete */
      if (
	(fhdr.filemode & FILE_MARKED) ||        /* 標記 */
        (fhdr.filemode & FILE_DIGEST)  ||        /* 文摘 */
        (id1 && (count < id1 || count > id2)) ||  /* range */
        (!id1 && Tagger(atoi (t + 2), count, TAG_NIN))) /* TagList */
	 {
	    if((safewrite(fdw, &fhdr, sizeof(fileheader_t)) == -1)) {
		close(fdr);
		close(fdw);
		unlink(my.newfn);
		flock(fd, LOCK_UN);
		close(fd);
		return -1;
	    }
	  }
	 else
          {
            //if(dashd(fullpath))
	        unlink(fullpath);
	  }
	++count;
    }
    close(fdr);
    close(fdw);
    if(Rename(fpath, my.oldfn) == -1 || Rename(my.newfn, fpath) == -1) {
	flock(fd, LOCK_UN);
	close(fd);
	return -1;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

int search_rec(char* dirname, int (*filecheck)()) {
    fileheader_t fhdr;
    FILE *fp;
    int ans = 0;
    
    if(!(fp = fopen(dirname, "r")))
	return 0;
    
    while(fread(&fhdr, sizeof(fhdr), 1, fp)) {
	ans++;
	if((*filecheck) (&fhdr)) {
	    fclose(fp);
	    return ans;
	}
    }
    fclose(fp);
    return 0;
}

int delete_files(char* dirname, int (*filecheck)(), int record) {
    fileheader_t fhdr;
    FILE *fp, *fptmp;
    int ans = 0;
    char tmpfname[128];
    char genbuf[256];
    char deleted[256];
    fileheader_t delfh;
    char deletedDIR[] = "boards/d/deleted/.DIR";
    
    strcpy(deleted, "boards/d/deleted");
  
    if(!(fp = fopen(dirname, "r")))
	return ans;
    
    strcpy(tmpfname, dirname);
    strcat(tmpfname, "_tmp");
    
    if(!(fptmp = fopen(tmpfname, "w"))) {
	fclose(fp);
	return ans;
    }
    
    while(fread(&fhdr, sizeof(fhdr), 1, fp)){
	if((*filecheck)(&fhdr)) {
	    ans++;
	    setdirpath(genbuf, dirname, fhdr.filename);
	    if (record){
		deleted[14] = '\0';
		stampfile(deleted, &delfh);
		strcpy(delfh.owner, fhdr.owner);
		strcpy(delfh.title, fhdr.title);
		Link(genbuf, deleted);
		append_record(deletedDIR, &delfh, sizeof(delfh));
	    }
	    unlink(genbuf);
	} else
	    fwrite(&fhdr, sizeof(fhdr), 1, fptmp);
    }
  
    fclose(fp);
    fclose(fptmp);
    unlink(dirname);
    Rename(tmpfname, dirname);
  
    return ans;
}

int delete_file(char *dirname, int size, int ent, int (*filecheck)()) {
    char abuf[BUFSIZE];
    int fd;
    struct stat st;
    long numents;
    
    if(ent < 1 || (fd = open(dirname, O_RDWR)) == -1)
	return -1;
    flock(fd, LOCK_EX);
    fstat(fd, &st);
    numents = ((long) st.st_size) / size;
    if(((long) st.st_size) % size)
	fprintf(stderr, "align err\n");
    if(lseek(fd, (off_t) size * (ent - 1), SEEK_SET) != -1) {
	if(read(fd, abuf, size) == size){
	    if((*filecheck) (abuf)) {
		int i;
		
		for(i = ent; i < numents; i++) {
		    if(lseek(fd, (off_t)((i) * size), SEEK_SET) == -1 ||
		       read(fd, abuf, size) != size 		     ||
		       lseek(fd, (off_t)(i - 1) * size, SEEK_SET) == -1)
			break;
		    if(safewrite(fd, abuf, size) != size)
			break;
		}
		ftruncate(fd, (off_t) size * (numents - 1));
		flock(fd, LOCK_UN);
		close(fd);
		return 0;
	    }
	}
    }
    lseek(fd, 0, SEEK_SET);
    ent = 1;
    while(read(fd, abuf, size) == size) {
	if((*filecheck)(abuf)) {
	    int i;
	    
	    for(i = ent; i < numents; i++) {
		if(lseek(fd, (off_t) (i + 1) * size, SEEK_SET) == -1 ||
		   read(fd, abuf, size) != size ||
		   lseek(fd, (off_t) (i) * size, SEEK_SET) == -1 ||
		   safewrite(fd, abuf, size) != size)
		    break;
	    }
	    ftruncate(fd, (off_t) size * (numents - 1));
	    flock(fd, LOCK_UN);
	    close(fd);
	    return 0;
	}
	ent++;
    }
    flock(fd, LOCK_UN);
    close(fd);
    return -1;
}

#endif                          /* !defined(_BBS_UTIL_C_) */

int apply_record(char *fpath, int (*fptr)(), int size) {
    char abuf[BUFSIZE];
    FILE* fp;
    
    if(!(fp = fopen(fpath, "r")))
	return -1;
    
    while(fread(abuf, 1, size, fp) == size)
	if((*fptr) (abuf) == QUIT) {
	    fclose(fp);
	    return QUIT;
	}
    fclose(fp);
    return 0;
}

/* mail / post 時，依據時間建立檔案，加上郵戳 */
int stampfile(char *fpath, fileheader_t *fh) {
    register char *ip = fpath;
    time_t dtime;
    struct tm *ptime;
    int fp = 0;

    if(access(fpath, X_OK | R_OK | W_OK))
	mkdir(fpath, 0755);

    time(&dtime);
    while (*(++ip));
    *ip++ = '/';
    do {
	sprintf(ip, "M.%ld.A", ++dtime );
	if(fp == -1 && errno != EEXIST)
	    return -1;
    } while((fp = open(fpath, O_CREAT | O_EXCL | O_WRONLY, 0644)) == -1);
    close(fp);
    memset(fh, 0, sizeof(fileheader_t));
    strcpy(fh->filename, ip);
    ptime = localtime(&dtime);
    sprintf(fh->date, "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
    return 0;
}

void stampdir(char *fpath, fileheader_t *fh) {
    register char *ip = fpath;
    time_t dtime;
    struct tm *ptime;
    
    if(access(fpath, X_OK | R_OK | W_OK))
	mkdir(fpath, 0755);
    
    time(&dtime);
    while(*(++ip));
    *ip++ = '/';
    do {
	sprintf(ip, "D%lX", ++dtime & 07777);
    } while(mkdir(fpath, 0755) == -1);
    memset(fh, 0, sizeof(fileheader_t));
    strcpy(fh->filename, ip);
    ptime = localtime(&dtime);
    sprintf(fh->date, "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
}

void stamplink(char *fpath, fileheader_t *fh) {
    register char *ip = fpath;
    time_t dtime;
    struct tm *ptime;

    if(access(fpath, X_OK | R_OK | W_OK))
	mkdir(fpath, 0755);

    time(&dtime);
    while(*(++ip));
    *ip++ = '/';
    do {
	sprintf(ip, "S%lX", ++dtime );
    } while(symlink("temp", fpath) == -1);
    memset(fh, 0, sizeof(fileheader_t));
    strcpy(fh->filename, ip);
    ptime = localtime(&dtime);
    sprintf(fh->date, "%2d/%02d", ptime->tm_mon + 1, ptime->tm_mday);
}

int do_append(char *fpath, fileheader_t *record, int size) {
    int fd;
    
    if((fd = open(fpath, O_WRONLY | O_CREAT, 0644)) == -1) {
	perror("open");
	return -1;
    }
    flock(fd, LOCK_EX);
    lseek(fd, 0, SEEK_END);
    
    safewrite(fd, record, size);
    
    flock(fd, LOCK_UN);
    close(fd);
    return 0;
}

int append_record(char *fpath, fileheader_t *record, int size) {
#if !defined(_BBS_UTIL_C_)
    int m,n;
    if(get_num_records(fpath, sizeof(fileheader_t)) <= MAX_KEEPMAIL * 2) {
	FILE *fp;
	char buf[512],address[200];

	for(n = strlen(fpath) - 1 ; fpath[n] != '/' && n > 0; n--);
	strncpy(buf, fpath, n + 1);
	buf[n + 1] = 0;
	for(m = strlen(buf) - 2 ; buf[m] != '/' && m > 0 ; m--);
	strcat(buf, ".forward");
	if((fp = fopen(buf,"r"))) {
	    fscanf(fp,"%s",address);
	    fclose(fp);
	    if(buf[0] != 0 && buf[0] != ' ') {
		buf[n + 1] = 0;
		strcat(buf, record->filename);
		do_append(fpath,record,size);
#ifndef  USE_BSMTP
		bbs_sendmail(buf,record->title,address);
#else
		bsmtp(buf, record->title, address, 0);
#endif
		return 0;
	    }
	}
    }
#endif 
    
    do_append(fpath,record,size);
    
    return 0;
}