#include "EXTERN.h"
#include "common.h"
#include "INTERN.h"
#include "util.h"

/* Rename a file, copying it if necessary. */


#ifdef AMIGA

#include <libraries/dos.h>
#include <libraries/dosextens.h>


/* backup & copy the file */
  static void copy_file();

int
move_file(from,to)
 char *from, *to;
{
  register long success;
  register int fromfd;
  register int i;
  register struct FileLock *destlock;
  int curnum='0';

  static char bakname[256];

/* declare us some AmigaDOS functions: */
  extern long DeleteFile();
  extern struct FileLock *Lock();
  extern void UnLock();
  extern long Rename();


    if (strEQ(to, "-")) {   /* cat it to stdout. */
#ifdef DEBUGGING
        if (debug & 4)
            say2("Moving %s to stdout.\n", from);
#endif
        fromfd = open(from, 0);
        if (fromfd < 0)
            fatal2("patch: internal error, can't reopen %s\n", from);
        while ((i=read(fromfd, buf, sizeof buf)) > 0)
            if (write(1, buf, i) != 1)
                fatal1("patch: write failed\n");
        Close(fromfd);
        return 0;
    }

/* add the extension to the name */
    Strcpy(bakname, to);
/* see if the "to" exists. If not, don't add the extension. */
    if (destlock=Lock(bakname)) {
        UnLock(destlock);
        Strcat(bakname, ORIGEXT);

        i = strlen(bakname);   /* find the end of string */
        bakname[i+1]=0;        /* so that the following will work: */

/* now to see if the destination exists: */
        while (destlock=Lock(bakname)) {
            UnLock(destlock);   /* clean up after ourselves. */
            bakname[i]=curnum++;
        }
/* ok, now we can do the relinking! */
        success = Rename(to,bakname);
        if (success==0) {
            say3("patch: can't backup %s, output is in %s\n",
                to, from);
            return -1;
        }
    }
/* ok, now copy the from to the to file. */
/* try renaming it first, & if that don't work, then copy it. */
    success = Rename(from,to);
    if (success==0) {                  /* if don't work, then copy! */
       copy_file(from,to);
       success=DeleteFile(from);
    }
    return 0;
}
#endif

#ifndef AMIGA
int
move_file(from,to)
char *from, *to;
{
    char bakname[512];
    Reg1 char *s;
    Reg2 int i;
    Reg3 int fromfd;

    /* to stdout? */

    if (strEQ(to, "-")) {
#ifdef DEBUGGING
        if (debug & 4)
            say2("Moving %s to stdout.\n", from);
#endif
        fromfd = open(from, 0);
        if (fromfd < 0)
            fatal2("patch: internal error, can't reopen %s\n", from);
        while ((i=read(fromfd, buf, sizeof buf)) > 0)
            if (write(1, buf, i) != 1)
                fatal1("patch: write failed\n");
        Close(fromfd);
        return 0;
    }

        if (origprae) {
                Strcpy (bakname, origprae);
        Strcat(bakname, to);
        } else {
                Strcpy(bakname, to);
        Strcat(bakname, origext?origext:ORIGEXT);
        }
    if (stat(to, &filestat) >= 0) {     /* output file exists */
        dev_t to_device = filestat.st_dev;
        ino_t to_inode  = filestat.st_ino;
        char *simplename = bakname;

        for (s=bakname; *s; s++) {
            if (*s == '/')
                simplename = s+1;
        }
        /* find a backup name that is not the same file */
        while (stat(bakname, &filestat) >= 0 &&
                to_device == filestat.st_dev && to_inode == filestat.st_ino) {
            for (s=simplename; *s && !islower(*s); s++) ;
            if (*s)
                *s = toupper(*s);
            else
                Strcpy(simplename, simplename+1);
        }
        while (unlink(bakname) >= 0) ;  /* while() is for benefit of Eunice */
#ifdef DEBUGGING
        if (debug & 4)
            say3("Moving %s to %s.\n", to, bakname);
#endif
        if (link(to, bakname) < 0) {
            say3("patch: can't backup %s, output is in %s\n",
                to, from);
            return -1;
        }
        while (unlink(to) >= 0) ;
    }
#ifdef DEBUGGING
    if (debug & 4)
        say3("Moving %s to %s.\n", from, to);
#endif
    if (link(from, to) < 0) {           /* different file system? */
        Reg4 int tofd;

        tofd = creat(to, 0666);
        if (tofd < 0) {
            say3("patch: can't create %s, output is in %s.\n",
              to, from);
            return -1;
        }
        fromfd = open(from, 0);
        if (fromfd < 0)
            fatal2("patch: internal error, can't reopen %s\n", from);
        while ((i=read(fromfd, buf, sizeof buf)) > 0)
            if (write(tofd, buf, i) != i)
                fatal1("patch: write failed\n");
        Close(fromfd);
        Close(tofd);
    }
    Unlink(from);
    return 0;
}
#endif

/* Copy a file. */

void
copy_file(from,to)
char *from, *to;
{
    Reg3 int tofd;
    Reg2 int fromfd;
    Reg1 int i;

    tofd = creat(to, 0666);

    if (tofd < 0)
        fatal2("patch: can't create %s.\n", to);
    fromfd = open(from, 0);
    if (fromfd < 0)
        fatal2("patch: internal error, can't reopen %s\n", from);
    while ((i=read(fromfd, buf, sizeof buf)) > 0)
        if (write(tofd, buf, i) != i)
            fatal2("patch: write (%s) failed\n", to);
    Close(fromfd);
    Close(tofd);
}

/* Allocate a unique area for a string. */

char *
savestr(s)
Reg1 char *s;
{
    Reg3 char *rv;
    Reg2 char *t;

    if (!s)
        s = "Oops";
    t = s;
    while (*t++);
    rv = malloc((MEM) (t - s));
    if (rv == Nullch) {
        if (using_plan_a)
            out_of_mem = TRUE;
        else
            fatal1("patch: out of memory (savestr)\n");
    }
    else {
        t = rv;
        while (*t++ = *s++);
    }
    return rv;
}

#ifdef lint

#ifdef CANVARARG

/*VARARGS ARGSUSED*/
say(pat) char *pat; { ; }
/*VARARGS ARGSUSED*/
fatal(pat) char *pat; { ; }
/*VARARGS ARGSUSED*/
ask(pat) char *pat; { ; }
#endif

#else

/* Vanilla terminal output (buffered). */

void
say(pat,arg1,arg2,arg3)
char *pat;
long arg1,arg2,arg3;
{
    fprintf(stderr, pat, arg1, arg2, arg3);
    Fflush(stderr);
}

/* Terminal output, pun intended. */

void                            /* very void */
fatal(pat,arg1,arg2,arg3)
char *pat;
long arg1,arg2,arg3;
{
    void my_exit();

    say(pat, arg1, arg2, arg3);
    my_exit(1);
}


#ifndef AMIGA

/* Get a response from the user, somehow or other. */

void
ask(pat,arg1,arg2,arg3)
char *pat;
long arg1,arg2,arg3;
{
    int ttyfd;
    int r;
    bool tty2 = isatty(2);

    Sprintf(buf, pat, arg1, arg2, arg3);
    Fflush(stderr);
    write(2, buf, strlen(buf));
    if (tty2) {                         /* might be redirected to a file */
        r = read(2, buf, sizeof buf);
    }
    else if (isatty(1)) {               /* this may be new file output */
        Fflush(stdout);
        write(1, buf, strlen(buf));
        r = read(1, buf, sizeof buf);
    }
    else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
                                        /* might be deleted or unwriteable */
        write(ttyfd, buf, strlen(buf));
        r = read(ttyfd, buf, sizeof buf);
        Close(ttyfd);
    }
    else if (isatty(0)) {               /* this is probably patch input */
        Fflush(stdin);
        write(0, buf, strlen(buf));
        r = read(0, buf, sizeof buf);
    }
    else {                              /* no terminal at all--default it */
        buf[0] = '\n';
        r = 1;
    }
    if (r <= 0)
        buf[0] = 0;
    else
        buf[r] = '\0';
    if (!tty2)
        say1(buf);
}
#else  /* Amiga */

/* for the Amiga we're going to have to do some heavy-duty magic.
   We can't open /dev/tty! So open a whole new window!
*/

void
ask(pat,arg1,arg2,arg3)
char *pat;
long arg1,arg2,arg3;
{
    int rwin;
    long actual_read;


    Sprintf(buf, pat, arg1, arg2, arg3);
    rwin=open("CON:0/10/400/100/Patch Response Window",O_RDWR+O_CREAT);
    if (rwin==0) {
        printf("Error:No window dressing.");
    }
    write(rwin,buf,strlen(buf));
    actual_read=read(rwin,buf,sizeof buf);
    if (actual_read==0)
       buf[0]=0;
    buf[actual_read]=0;
/*    printf("actual_read=%d buf=%s\n",actual_read,buf); */
    Close(rwin);
}
#endif  /* amiga */
#endif  /* lint */


/* How to handle certain events when not in a critical region. */

void
set_signals(reset)
 int reset;
{
    void my_exit();

#ifdef AMIGA
    extern short Enable_Abort;

    Enable_Abort=1;

#else

#ifndef lint
#ifdef VOIDSIG
    static void (*hupval)(),(*intval)();
#else
    static int (*hupval)(),(*intval)();
#endif
    if (!reset) {
      hupval = signal(SIGHUP, SIG_IGN);
      if (hupval != SIG_IGN)
#ifdef VOIDSIG
          hupval = my_exit;
#else
          hupval = (int(*)())my_exit;
#endif
      intval = signal(SIGINT, SIG_IGN);
      if (intval != SIG_IGN)
#ifdef VOIDSIG
          intval = my_exit;
#else
          intval = (int(*)())my_exit;
#endif
    }
    Signal(SIGHUP, hupval);
    Signal(SIGINT, intval);
#endif

#endif
}

/* How to handle certain events when in a critical region. */

void
ignore_signals()
{
#ifdef AMIGA
  extern short Enable_Abort;

  Enable_Abort=0;
#else

#ifndef lint
    Signal(SIGHUP, SIG_IGN);
    Signal(SIGINT, SIG_IGN);
#endif
#endif

}

#ifdef AMIGA

/* this is a recursive subroutine. It isn't the epitomy of efficiency.
   On the other hand, even as a recursive subroutine it's more
   space-efficient than Larry Wall's monstrosity, because it doesn't
   allocate huge structures on the stack.
*/

void
makedirs(filename,striplast)
  char *filename;
  bool striplast;
{
    register char *walkptr=filename;
    register char temp;
    register char *tmpptr;
    struct FileLock *new_dir;
    struct FileLock *old_dir;

    extern char *index();
    extern struct FileLock *CurrentDir();
    extern struct FileLock *CreateDir();

/* first the easy part: */
    if (walkptr[0]=0)    /* don't try to walk a null filename! */
        return;          /* end recursing. */
    if (walkptr[0]=='.' && walkptr[1]=='/')
        walkptr+=2;
    if (walkptr[0]=='/')  /* starting at root: */
       walkptr[0]=':';    /* AmigaDOS root. */

    tmpptr=index(walkptr,'/'); /* see if there's subdirectories. */
    if (tmpptr==0 && striplast) { /* oops, no more filenames. Do we striplast? */
          return;  /* yes, strip last, quit recursing. */
    }

    temp=*tmpptr;
    *tmpptr++=0;                    /* walkptr now points to dirname. */

/* the next stuff is very Amiga-dependent: */
    new_dir=Lock(walkptr,ACCESS_READ);  /* see if new dir exists. */
    if (new_dir==NULL) {
        (void) printf("Creating directory %s ...\n",walkptr);
        (void) fflush(stdout);
        new_dir=CreateDir(walkptr);    /* if not, create it. */
    }
    old_dir=CurrentDir(new_dir);  /* change working directory to new dir */

    (void) makedirs(tmpptr,striplast);    /* recurse, create further dirs. */
    (void) CurrentDir(old_dir);       /* get old dir back. */
    UnLock(new_dir);                 /* free the lock. */
    *(tmpptr-1)=temp;                /* restore original filename */
    /* and return. */
}

#else

/* Make sure we'll have the directories to create a file. */

void
makedirs(filename,striplast)
Reg1 char *filename;
bool striplast;
{
    char tmpbuf[256];
    Reg2 char *s = tmpbuf;
    char *dirv[20];
    Reg3 int i;
    Reg4 int dirvp = 0;

    while (*filename) {
        if (*filename == '/') {
            filename++;
            dirv[dirvp++] = s;
            *s++ = '\0';
        }
        else {
            *s++ = *filename++;
        }
    }
    *s = '\0';
    dirv[dirvp] = s;
    if (striplast)
        dirvp--;
    if (dirvp < 0)
        return;
    strcpy(buf, "mkdir");
    s = buf;
    for (i=0; i<=dirvp; i++) {
        while (*s) s++;
        *s++ = ' ';
        strcpy(s, tmpbuf);
        *dirv[i] = '/';
    }
    system(buf);

}

#endif


#ifdef AMIGA

/* returns 1 if result is a directory, 0 if not. */
int IsDir(s)
  register char *s;
{
   extern int Examine();
   extern struct FileLock *Lock();
   extern void UnLock();

   static struct FileInfoBlock fib;
   register struct FileLock *destlock;
   register int result;

    destlock=Lock(s);
    if (s==0) return (0);
    result=Examine(destlock,&fib);
    UnLock(destlock);                /* clean up after ourselves. */
    if (result==0) {
        printf("Examine result = %d\n",result);
        return 0;
    }
    if (fib.fib_DirEntryType > 0) return 1;
    return 0;
}


/* chmod to satisfy us: */

void chmod() {}

/* abort to satisfy us: */

void abort() { exit(1); }

#endif

/* Make filenames more reasonable. */

char *
fetchname(at,strip_leading,assume_exists)
char *at;
int strip_leading;
int assume_exists;
{
    char *s;
    char *name;
    Reg1 char *t;
    char tmpbuf[200];

    if (!at)
        return Nullch;
    s = savestr(at);
    for (t=s; isspace(*t); t++) ;
    name = t;
#ifdef DEBUGGING
    if (debug & 128)
        say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
#endif
    if (strnEQ(name, "/dev/null", 9))   /* so files can be created by diffing */
        return Nullch;                  /*   against /dev/null. */
    for (; *t && !isspace(*t); t++)
        if (*t == '/')
            if (--strip_leading >= 0)
                name = t+1;
    *t = '\0';
    if (name != s && *s != '/') {
        name[-1] = '\0';
#ifdef AMIGA
        if (IsDir(s)) {
#else
        if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
#endif
            name[-1] = '/';
            name=s;
        }
    }
    name = savestr(name);
    Sprintf(tmpbuf, "RCS/%s", name);
    free(s);
    if (stat(name, &filestat) < 0 && !assume_exists) {
#ifdef AMIGA
        name = Nullch;   /* Amiga doesn't have RCS. */
#else
        Strcat(tmpbuf, RCSSUFFIX);
        if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
            Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
            if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
                free(name);
                name = Nullch;
            }
        }
#endif
    }
    return name;
}