Initial revision

1 files changed, 925 insertions, 0 deletions

diff --git a/libc/stdio/stdio.c b/libc/stdio/stdio.c
new file mode 100644
index 000000000..98d0ba3b4
--- /dev/null
+++ b/libc/stdio/stdio.c
@@ -0,0 +1,925 @@
+/* Copyright (C) 1996 Robert de Bath <rdebath@cix.compulink.co.uk>
+ * This file is part of the Linux-8086 C library and is distributed
+ * under the GNU Library General Public License.
+ */
+
+/* This is an implementation of the C standard IO package.
+ */
+
+#include <stdio.h>
+
+#include <fcntl.h>
+#include <sys/types.h>
+#include <malloc.h>
+#include <errno.h>
+
+#undef STUB_FWRITE
+
+extern FILE *__IO_list;		/* For fflush at exit */
+
+#define FIXED_BUFFERS 2
+struct fixed_buffer {
+	unsigned char data[BUFSIZ];
+	int used;
+};
+
+extern struct fixed_buffer _fixed_buffers[2];
+
+#define Inline_init __io_init_vars()
+
+#ifdef L__stdio_init
+
+#define buferr (stderr->unbuf)	/* Stderr is unbuffered */
+
+FILE *__IO_list = 0;		/* For fflush at exit */
+
+#if 0
+static char bufin[BUFSIZ];
+static char bufout[BUFSIZ];
+#ifndef buferr
+static char buferr[BUFSIZ];
+#endif
+
+#else
+static char *bufin;
+static char *bufout;
+#ifndef buferr
+static char *buferr;
+#endif
+#endif
+
+FILE  stdin[1] =
+{
+#if 0
+   {bufin, bufin, bufin, bufin, bufin + sizeof(bufin),
+#else
+   {0, 0, 0, 0, 0,
+#endif
+    0, _IOFBF | __MODE_READ | __MODE_IOTRAN}
+};
+
+FILE  stdout[1] =
+{
+#if 0
+   {bufout, bufout, bufout, bufout, bufout + sizeof(bufout),
+#else
+   {0, 0, 0, 0, 0,
+#endif
+    1, _IOFBF | __MODE_WRITE | __MODE_IOTRAN}
+};
+
+FILE  stderr[1] =
+{
+#if 0
+   {buferr, buferr, buferr, buferr, buferr + sizeof(buferr),
+#else
+   {0, 0, 0, 0, 0,
+#endif
+    2, _IONBF | __MODE_WRITE | __MODE_IOTRAN}
+};
+
+/* Call the stdio initiliser; it's main job it to call atexit */
+
+#define STATIC
+
+STATIC int 
+__stdio_close_all()
+{
+   FILE *fp;
+   fflush(stdout);
+   fflush(stderr);
+   for (fp = __IO_list; fp; fp = fp->next)
+   {
+      fflush(fp);
+      close(fp->fd);
+      /* Note we're not de-allocating the memory */
+      /* There doesn't seem to be much point :-) */
+      fp->fd = -1;
+   }
+}
+
+static int first_time = 0;
+
+struct fixed_buffer _fixed_buffers[2];
+
+
+STATIC void 
+__io_init_vars()
+{
+   if( first_time ) return;
+   first_time = 1;
+
+   stdin->bufpos = bufin = _fixed_buffers[0].data; /*(char *)malloc(BUFSIZ)*/;
+   stdin->bufread =  bufin;
+   stdin->bufwrite = bufin;
+   stdin->bufstart = bufin;
+   stdin->bufend =  bufin + sizeof(bufin);
+   stdin->fd = 0;
+   stdin->mode = _IOFBF | __MODE_READ | __MODE_IOTRAN | __MODE_FREEBUF;
+   
+   _fixed_buffers[0].used = 1;
+
+   stdout->bufpos = bufout = _fixed_buffers[1].data; /*(char *)malloc(BUFSIZ);*/
+   stdout->bufread =  bufout;
+   stdout->bufwrite = bufout;
+   stdout->bufstart = bufout;
+   stdout->bufend =  bufout + sizeof(bufout);
+   stdout->fd = 1;
+   stdout->mode = _IOFBF | __MODE_WRITE | __MODE_IOTRAN | __MODE_FREEBUF;
+   
+   _fixed_buffers[1].used = 1;
+
+#if 0
+   stderr->bufpos = buferr = (char *)malloc(BUFSIZ);
+#else
+   stderr->bufpos = buferr;
+#endif
+   stderr->bufread =  buferr;
+   stderr->bufwrite = buferr;
+   stderr->bufstart = buferr;
+   stderr->bufend =  buferr + sizeof(buferr);
+   stderr->fd = 2;
+   stderr->mode = _IONBF | __MODE_WRITE | __MODE_IOTRAN;
+
+   if (isatty(1))
+      stdout->mode |= _IOLBF;
+   atexit(__stdio_close_all);
+}
+#endif
+
+#ifdef L_fputc
+int
+fputc(ch, fp)
+int   ch;
+FILE *fp;
+{
+   register int v;
+   Inline_init;
+
+   v = fp->mode;
+   /* If last op was a read ... */
+   if ((v & __MODE_READING) && fflush(fp))
+      return EOF;
+
+   /* Can't write or there's been an EOF or error then return EOF */
+   if ((v & (__MODE_WRITE | __MODE_EOF | __MODE_ERR)) != __MODE_WRITE)
+      return EOF;
+
+   /* In MSDOS translation mode */
+#if __MODE_IOTRAN
+   if (ch == '\n' && (v & __MODE_IOTRAN) && fputc('\r', fp) == EOF)
+      return EOF;
+#endif
+
+   /* Buffer is full */
+   if (fp->bufpos >= fp->bufend && fflush(fp))
+      return EOF;
+
+   /* Right! Do it! */
+   *(fp->bufpos++) = ch;
+   fp->mode |= __MODE_WRITING;
+
+   /* Unbuffered or Line buffered and end of line */
+   if (((ch == '\n' && (v & _IOLBF)) || (v & _IONBF))
+       && fflush(fp))
+      return EOF;
+
+   /* Can the macro handle this by itself ? */
+   if (v & (__MODE_IOTRAN | _IOLBF | _IONBF))
+      fp->bufwrite = fp->bufstart;	/* Nope */
+   else
+      fp->bufwrite = fp->bufend;	/* Yup */
+
+   /* Correct return val */
+   return (unsigned char) ch;
+}
+#endif
+
+#ifdef L_fgetc
+int
+fgetc(fp)
+FILE *fp;
+{
+   int   ch;
+   Inline_init;
+
+   if (fp->mode & __MODE_WRITING)
+      fflush(fp);
+
+ try_again:
+   /* Can't read or there's been an EOF or error then return EOF */
+   if ((fp->mode & (__MODE_READ | __MODE_EOF | __MODE_ERR)) != __MODE_READ)
+      return EOF;
+
+   /* Nothing in the buffer - fill it up */
+   if (fp->bufpos >= fp->bufread)
+   {
+      fp->bufpos = fp->bufread = fp->bufstart;
+      ch = fread(fp->bufpos, 1, fp->bufend - fp->bufstart, fp);
+      if (ch == 0)
+	 return EOF;
+      fp->bufread += ch;
+      fp->mode |= __MODE_READING;
+      fp->mode &= ~__MODE_UNGOT;
+   }
+   ch = *(fp->bufpos++);
+
+#if __MODE_IOTRAN
+   /* In MSDOS translation mode; WARN: Doesn't work with UNIX macro */
+   if (ch == '\r' && (fp->mode & __MODE_IOTRAN))
+      goto try_again;
+#endif
+
+   return ch;
+}
+#endif
+
+#ifdef L_fflush
+int
+fflush(fp)
+FILE *fp;
+{
+   int   len, cc, rv=0;
+   char * bstart;
+   if (fp == NULL)		/* On NULL flush the lot. */
+   {
+      if (fflush(stdin))
+	 return EOF;
+      if (fflush(stdout))
+	 return EOF;
+      if (fflush(stderr))
+	 return EOF;
+
+      for (fp = __IO_list; fp; fp = fp->next)
+	 if (fflush(fp))
+	    return EOF;
+
+      return 0;
+   }
+
+   /* If there's output data pending */
+   if (fp->mode & __MODE_WRITING)
+   {
+      len = fp->bufpos - fp->bufstart;
+
+      if (len)
+      {
+	 bstart = fp->bufstart;
+	 /*
+	  * The loop is so we don't get upset by signals or partial writes.
+	  */
+	 do
+	 {
+	    cc = write(fp->fd, bstart, len);
+	    if( cc > 0 )
+	    {
+	       bstart+=cc; len-=cc;
+	    }
+	 }
+	 while ( cc>0 || (cc == -1 && errno == EINTR));
+	 /*
+	  * If we get here with len!=0 there was an error, exactly what to
+	  * do about it is another matter ...
+	  *
+	  * I'll just clear the buffer.
+	  */
+	 if (len)
+	 {
+	    fp->mode |= __MODE_ERR;
+	    rv = EOF;
+	 }
+      }
+   }
+   /* If there's data in the buffer sychronise the file positions */
+   else if (fp->mode & __MODE_READING)
+   {
+      /* Humm, I think this means sync the file like fpurge() ... */
+      /* Anyway the user isn't supposed to call this function when reading */
+
+      len = fp->bufread - fp->bufpos;	/* Bytes buffered but unread */
+      /* If it's a file, make it good */
+      if (len > 0 && lseek(fp->fd, (long)-len, 1) < 0)
+      {
+	 /* Hummm - Not certain here, I don't think this is reported */
+	 /*
+	  * fp->mode |= __MODE_ERR; return EOF;
+	  */
+      }
+   }
+
+   /* All done, no problem */
+   fp->mode &= (~(__MODE_READING|__MODE_WRITING|__MODE_EOF|__MODE_UNGOT));
+   fp->bufread = fp->bufwrite = fp->bufpos = fp->bufstart;
+   return rv;
+}
+#endif
+
+#ifdef L_fgets
+/* Nothing special here ... */
+char *
+fgets(s, count, f)
+char *s;
+size_t count;
+FILE *f;
+{
+   char *ret;
+   register size_t i;
+   register int ch;
+
+   ret = s;
+   for (i = count; i > 0; i--)
+   {
+      ch = getc(f);
+      if (ch == EOF)
+      {
+	 if (s == ret)
+	    return 0;
+	 break;
+      }
+      *s++ = (char) ch;
+      if (ch == '\n')
+	 break;
+   }
+   *s = 0;
+
+   if (ferror(f))
+      return 0;
+   return ret;
+}
+#endif
+
+#ifdef L_gets
+char *
+gets(str)			/* BAD function; DON'T use it! */
+char *str;
+{
+   /* Auwlright it will work but of course _your_ program will crash */
+   /* if it's given a too long line */
+   register char *p = str;
+   register int c;
+
+   while (((c = getc(stdin)) != EOF) && (c != '\n'))
+      *p++ = c;
+   *p = '\0';
+   return (((c == EOF) && (p == str)) ? NULL : str);	/* NULL == EOF */
+}
+#endif
+
+#ifdef L_fputs
+int
+fputs(str, fp)
+char *str;
+FILE *fp;
+{
+   register int n = 0;
+   while (*str)
+   {
+      if (putc(*str++, fp) == EOF)
+	 return (EOF);
+      ++n;
+   }
+   return (n);
+}
+#endif
+
+#ifdef L_puts
+int
+puts(str)
+char *str;
+{
+   register int n;
+
+   if (((n = fputs(str, stdout)) == EOF)
+       || (putc('\n', stdout) == EOF))
+      return (EOF);
+   return (++n);
+}
+#endif
+
+#ifdef L_fread
+/*
+ * fread will often be used to read in large chunks of data calling read()
+ * directly can be a big win in this case. Beware also fgetc calls this
+ * function to fill the buffer.
+ * 
+ * This ignores __MODE__IOTRAN; probably exactly what you want. (It _is_ what
+ * fgetc wants)
+ */
+int
+fread(buf, size, nelm, fp)
+char *buf;
+int   size;
+int   nelm;
+FILE *fp;
+{
+   int   len, v;
+   unsigned bytes, got = 0;
+   Inline_init;
+
+   v = fp->mode;
+
+   /* Want to do this to bring the file pointer up to date */
+   if (v & __MODE_WRITING)
+      fflush(fp);
+
+   /* Can't read or there's been an EOF or error then return zero */
+   if ((v & (__MODE_READ | __MODE_EOF | __MODE_ERR)) != __MODE_READ)
+      return 0;
+
+   /* This could be long, doesn't seem much point tho */
+   bytes = size * nelm;
+
+   len = fp->bufread - fp->bufpos;
+   if (len >= bytes)		/* Enough buffered */
+   {
+      memcpy(buf, fp->bufpos, (unsigned) bytes);
+      fp->bufpos += bytes;
+      return bytes;
+   }
+   else if (len > 0)		/* Some buffered */
+   {
+      memcpy(buf, fp->bufpos, len);
+      got = len;
+   }
+
+   /* Need more; do it with a direct read */
+   len = read(fp->fd, buf + got, (unsigned) (bytes - got));
+
+   /* Possibly for now _or_ later */
+   if (len < 0)
+   {
+      fp->mode |= __MODE_ERR;
+      len = 0;
+   }
+   else if (len == 0)
+      fp->mode |= __MODE_EOF;
+
+   return (got + len) / size;
+}
+#endif
+
+#ifdef L_fwrite
+/*
+ * Like fread, fwrite will often be used to write out large chunks of
+ * data; calling write() directly can be a big win in this case.
+ * 
+ * But first we check to see if there's space in the buffer.
+ * 
+ * Again this ignores __MODE__IOTRAN.
+ */
+int
+fwrite(buf, size, nelm, fp)
+char *buf;
+int   size;
+int   nelm;
+FILE *fp;
+{
+   register int v;
+   int   len;
+   unsigned bytes, put;
+
+#ifdef STUB_FWRITE
+	bytes = size * nelm;
+	while(bytes>0) {
+		len=write(fp->fd, buf, bytes);
+		if (len<=0) {
+			break;
+		}
+		bytes -= len;
+		buf += len;
+	}
+	return nelm;
+#else
+		
+   v = fp->mode;
+   /* If last op was a read ... */
+   if ((v & __MODE_READING) && fflush(fp))
+      return 0;
+
+   /* Can't write or there's been an EOF or error then return 0 */
+   if ((v & (__MODE_WRITE | __MODE_EOF | __MODE_ERR)) != __MODE_WRITE)
+      return 0;
+
+   /* This could be long, doesn't seem much point tho */
+   bytes = size * nelm;
+
+   len = fp->bufend - fp->bufpos;
+
+   /* Flush the buffer if not enough room */
+   if (bytes > len)
+      if (fflush(fp))
+	 return 0;
+
+   len = fp->bufend - fp->bufpos;
+   if (bytes <= len)		/* It'll fit in the buffer ? */
+   {
+      fp->mode |= __MODE_WRITING;
+      memcpy(fp->bufpos, buf, bytes);
+      fp->bufpos += bytes;
+
+      /* If we're not fully buffered */
+      if (v & (_IOLBF | _IONBF))
+	 fflush(fp);
+
+      return nelm;
+   }
+   else
+      /* Too big for the buffer */
+   {
+      put = bytes;
+      do
+      {
+         len = write(fp->fd, buf, bytes);
+	 if( len > 0 )
+	 {
+	    buf+=len; bytes-=len;
+	 }
+      }
+      while (len > 0 || (len == -1 && errno == EINTR));
+
+      if (len < 0)
+	 fp->mode |= __MODE_ERR;
+
+      put -= bytes;
+   }
+
+   return put / size;
+#endif
+}
+#endif
+
+#ifdef L_rewind
+void
+rewind(fp)
+FILE * fp;
+{
+   fseek(fp, (long)0, 0);
+   clearerr(fp);
+}
+#endif
+
+#ifdef L_fseek
+int
+fseek(fp, offset, ref)
+FILE *fp;
+long  offset;
+int   ref;
+{
+#if 0 
+   /* FIXME: this is broken!  BROKEN!!!! */
+   /* if __MODE_READING and no ungetc ever done can just move pointer */
+   /* This needs testing! */
+
+   if ( (fp->mode &(__MODE_READING | __MODE_UNGOT)) == __MODE_READING && 
+        ( ref == SEEK_SET || ref == SEEK_CUR ))
+   {
+      long fpos = lseek(fp->fd, 0L, SEEK_CUR);
+      if( fpos == -1 ) return EOF;
+
+      if( ref == SEEK_CUR )
+      {
+         ref = SEEK_SET;
+	 offset = fpos + offset + fp->bufpos - fp->bufread;
+      }
+      if( ref == SEEK_SET )
+      {
+         if ( offset < fpos && offset >= fpos + fp->bufstart - fp->bufread )
+	 {
+	    fp->bufpos = offset - fpos + fp->bufread;
+	    return 0;
+	 }
+      }
+   }
+#endif
+
+   /* Use fflush to sync the pointers */
+
+   if (fflush(fp) == EOF)
+      return EOF;
+   if (lseek(fp->fd, offset, ref) < 0)
+      return EOF;
+   return 0;
+}
+#endif
+
+#ifdef L_ftell
+long ftell(fp)
+FILE * fp;
+{
+   long rv;
+   if (fflush(fp) == EOF)
+      return EOF;
+   return lseek(fp->fd, 0L, SEEK_CUR);
+}
+#endif
+
+#ifdef L_fopen
+/*
+ * This Fopen is all three of fopen, fdopen and freopen. The macros in
+ * stdio.h show the other names.
+ */
+FILE *
+__fopen(fname, fd, fp, mode)
+char *fname;
+int   fd;
+FILE *fp;
+char *mode;
+{
+   int   open_mode = 0;
+#if __MODE_IOTRAN
+   int	 do_iosense = 1;
+#endif
+   int   fopen_mode = 0;
+   FILE *nfp = 0;
+
+   /* If we've got an fp close the old one (freopen) */
+   if (fp)
+   {
+      /* Careful, don't de-allocate it */
+      fopen_mode |= (fp->mode & (__MODE_BUF | __MODE_FREEFIL | __MODE_FREEBUF));
+      fp->mode &= ~(__MODE_FREEFIL | __MODE_FREEBUF);
+      fclose(fp);
+   }
+
+   /* decode the new open mode */
+   while (*mode)
+      switch (*mode++)
+      {
+      case 'r':
+	 fopen_mode |= __MODE_READ;
+	 break;
+      case 'w':
+	 fopen_mode |= __MODE_WRITE;
+	 open_mode = (O_CREAT | O_TRUNC);
+	 break;
+      case 'a':
+	 fopen_mode |= __MODE_WRITE;
+	 open_mode = (O_CREAT | O_APPEND);
+	 break;
+      case '+':
+	 fopen_mode |= __MODE_RDWR;
+	 break;
+#if __MODE_IOTRAN
+      case 'b':		/* Binary */
+	 fopen_mode &= ~__MODE_IOTRAN;
+	 do_iosense=0;
+	 break;
+      case 't':		/* Text */
+	 fopen_mode |= __MODE_IOTRAN;
+	 do_iosense=0;
+	 break;
+#endif
+      }
+
+   /* Add in the read/write options to mode for open() */
+   switch (fopen_mode & (__MODE_READ | __MODE_WRITE))
+   {
+   case 0:
+      return 0;
+   case __MODE_READ:
+      open_mode |= O_RDONLY;
+      break;
+   case __MODE_WRITE:
+      open_mode |= O_WRONLY;
+      break;
+   default:
+      open_mode |= O_RDWR;
+      break;
+   }
+
+   /* Allocate the (FILE) before we do anything irreversable */
+   if (fp == 0)
+   {
+      nfp = malloc(sizeof(FILE));
+      if (nfp == 0)
+	 return 0;
+   }
+
+   /* Open the file itself */
+   if (fname)
+      fd = open(fname, open_mode, 0666);
+   if (fd < 0)			/* Grrrr */
+   {
+      if (nfp)
+	 free(nfp);
+      return 0;
+   }
+
+   /* If this isn't freopen create a (FILE) and buffer for it */
+   if (fp == 0)
+   {
+      int i;
+      fp = nfp;
+      fp->next = __IO_list;
+      __IO_list = fp;
+
+      fp->mode = __MODE_FREEFIL;
+      if( isatty(fd) )
+      {
+	 fp->mode |= _IOLBF;
+#if __MODE_IOTRAN
+	 if( do_iosense ) fopen_mode |= __MODE_IOTRAN;
+#endif
+      }
+      else
+	 fp->mode |= _IOFBF;
+
+      for(i=0;i<FIXED_BUFFERS;i++)
+         if (!_fixed_buffers[i].used) {
+            fp->bufstart = _fixed_buffers[i].data;
+            _fixed_buffers[i].used = 1;
+            break;
+         }
+
+      if (i == FIXED_BUFFERS)
+         fp->bufstart = malloc(BUFSIZ);
+         
+      if (fp->bufstart == 0)	/* Oops, no mem */
+      {				/* Humm, full buffering with a two(!) byte
+				 * buffer. */
+	 fp->bufstart = fp->unbuf;
+	 fp->bufend = fp->unbuf + sizeof(fp->unbuf);
+      }
+      else
+      {
+	 fp->bufend = fp->bufstart + BUFSIZ;
+	 fp->mode |= __MODE_FREEBUF;
+      }
+   }
+   /* Ok, file's ready clear the buffer and save important bits */
+   fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart;
+   fp->mode |= fopen_mode;
+   fp->fd = fd;
+   return fp;
+}
+#endif
+
+#ifdef L_fclose
+int
+fclose(fp)
+FILE *fp;
+{
+   int   rv = 0;
+
+   if (fp == 0)
+   {
+      errno = EINVAL;
+      return EOF;
+   }
+   if (fflush(fp))
+      return EOF;
+
+   if (close(fp->fd))
+      rv = EOF;
+   fp->fd = -1;
+
+   if (fp->mode & __MODE_FREEBUF)
+   {
+      int i;
+      for(i=0;i<FIXED_BUFFERS;i++)
+         if (fp->bufstart == _fixed_buffers[i].data) {
+           _fixed_buffers[i].used = 0;
+           break;
+         }
+      if(i==FIXED_BUFFERS)
+         free(fp->bufstart);
+      fp->mode &= ~__MODE_FREEBUF;
+      fp->bufstart = fp->bufend = 0;
+   }
+
+   if (fp->mode & __MODE_FREEFIL)
+   {
+      FILE *prev = 0, *ptr;
+      fp->mode = 0;
+
+      for (ptr = __IO_list; ptr && ptr != fp; ptr = ptr->next)
+	 ;
+      if (ptr == fp)
+      {
+	 if (prev == 0)
+	    __IO_list = fp->next;
+	 else
+	    prev->next = fp->next;
+      }
+      free(fp);
+   }
+   else
+      fp->mode = 0;
+
+   return rv;
+}
+#endif
+
+#ifdef L_setbuffer
+void
+setbuffer(fp, buf, size)
+FILE * fp;
+char * buf;
+int size;
+{
+   fflush(fp);
+   
+   if ((fp->bufstart == (unsigned char*)buf) && (fp->bufend == ((unsigned char*)buf + size)))
+      return;
+   
+   if( fp->mode & __MODE_FREEBUF ) {
+      int i;
+      for(i=0;i<FIXED_BUFFERS;i++)
+         if (fp->bufstart == _fixed_buffers[i].data) {
+           _fixed_buffers[i].used = 0;
+           break;
+         }
+      if(i==FIXED_BUFFERS)
+         free(fp->bufstart);
+   }
+   fp->mode &= ~(__MODE_FREEBUF|__MODE_BUF);
+
+   if( buf == 0 )
+   {
+      fp->bufstart = fp->unbuf;
+      fp->bufend = fp->unbuf + sizeof(fp->unbuf);
+      fp->mode |= _IONBF;
+   }
+   else
+   {
+      fp->bufstart = buf;
+      fp->bufend = buf+size;
+      fp->mode |= _IOFBF;
+   }
+   fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart;
+}
+#endif
+
+#ifdef L_setvbuf
+int setvbuf(fp, buf, mode, size)
+FILE * fp;
+char * buf;
+int mode;
+size_t size;
+{
+   fflush(fp);
+   if( fp->mode & __MODE_FREEBUF ) {
+      int i;
+      for(i=0;i<FIXED_BUFFERS;i++)
+         if (fp->bufstart == _fixed_buffers[i].data) {
+           _fixed_buffers[i].used = 0;
+           break;
+         }
+      if(i==FIXED_BUFFERS)
+         free(fp->bufstart);
+   }
+   fp->mode &= ~(__MODE_FREEBUF|__MODE_BUF);
+   fp->bufstart = fp->unbuf;
+   fp->bufend = fp->unbuf + sizeof(fp->unbuf);
+   fp->mode |= _IONBF;
+
+   if( mode == _IOFBF || mode == _IOLBF )
+   {
+      if( size <= 0  ) size = BUFSIZ;
+      if( buf == 0 )
+         if (size == BUFSIZ) {
+            int i;
+            for(i=0;i<FIXED_BUFFERS;i++)
+               if (!_fixed_buffers[i].used) {
+                 _fixed_buffers[i].used = 1;
+                 buf = _fixed_buffers[i].data;
+                 break;
+               }
+            if(i==FIXED_BUFFERS)
+               buf = malloc(size);
+         } else
+            buf = malloc(size);
+      if( buf == 0 ) return EOF;
+
+      fp->bufstart = buf;
+      fp->bufend = buf+size;
+      fp->mode |= mode;
+   }
+   fp->bufpos = fp->bufread = fp->bufwrite = fp->bufstart;
+}
+#endif
+
+#ifdef L_ungetc
+int
+ungetc(c, fp)
+int c;
+FILE *fp;
+{
+   if (fp->mode & __MODE_WRITING)
+      fflush(fp);
+
+   /* Can't read or there's been an error then return EOF */
+   if ((fp->mode & (__MODE_READ | __MODE_ERR)) != __MODE_READ)
+      return EOF;
+
+   /* Can't do fast fseeks */
+   fp->mode |= __MODE_UNGOT;
+
+   if( fp->bufpos > fp->bufstart )
+      return *--fp->bufpos = (unsigned char) c;
+   else if( fp->bufread == fp->bufstart )
+      return *fp->bufread++ = (unsigned char) c;
+   else
+      return EOF;
+}
+#endif