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// textfile.c -- file class for dealing with text files
/******************************************************************************
*
* MiXViews - an X window system based sound & data editor/processor
*
* Copyright (c) 1993, 1994 Regents of the University of California
*
* Author: Douglas Scott
* Date: December 13, 1994
*
* Permission to use, copy and modify this software and its documentation
* for research and/or educational purposes 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. The author reserves the right to distribute this
* software and its documentation. The University of California and the author
* make no representations about the suitability of this software for any
* purpose, and in no event shall University of California be liable for any
* damage, loss of data, or profits resulting from its use.
* It is provided "as is" without express or implied warranty.
*
******************************************************************************/
#include "localdefs.h"
#ifdef __GNUG__
#pragma implementation
#endif
#include "textfile.h"
TextFile::TextFile(const char* filename, io_mode m, access_mode a) {
open(filename, m, a);
}
TextFile::TextFile(const char* filename, const char* m) {
open(filename, m);
}
//------------------------------------------------------------------
TextFile& TextFile::put(const char* s)
{
return failif(!writable() || fputs(s, fp) == EOF);
}
TextFile& TextFile::get(char* s, int n, char terminator)
{
if (!readable())
{
set(_fail);
return *this;
}
char ch;
stat = --n;
if (n > 0 && (get(ch)))
{
if (ch == terminator) {
unget(ch);
stat= 0; // This is not an error condition !
}
else
{
*s++ = ch; --n;
while (n > 0 && (get(ch)))
{
if (ch == terminator)
{
unget(ch);
break;
}
else
{
*s++ = ch; --n;
}
}
}
}
*s = 0;
return failif((stat != 0) && ((stat -= n) == 0));
}
TextFile& TextFile::getline(char* s, int n, char terminator)
{
if (!readable())
{
set(_fail);
return *this;
}
char ch;
stat = --n;
while (n > 0 && (get(ch)))
{
--n;
if ((*s++ = ch) == terminator)
break;
}
*s = 0;
return failif((stat != 0) && ((stat -= n) == 0));
}
// from Doug Schmidt
// This should probably be a page size....
#define CHUNK_SIZE 512
/* Reads an arbitrarily MXINT32 input line terminated by a user-specified
TERMINATOR. Super-nifty trick using recursion avoids unnecessary calls
to NEW! */
char *TextFile::readline (int chunk_number, char terminator)
{
char buf[CHUNK_SIZE];
register char *bufptr = buf;
register char *ptr;
char ch;
int continu;
while ((continu = !!get(ch)) && ch != terminator) /* fill the current buffer */
{
*bufptr++ = ch;
if (bufptr - buf >= CHUNK_SIZE) /* prepend remainder to ptr buffer */
{
if (ptr = readline (chunk_number + 1, terminator))
for (; bufptr != buf; *--ptr = *--bufptr);
return ptr;
}
}
if (!continu && bufptr == buf)
return NULL;
int size = (chunk_number * CHUNK_SIZE + bufptr - buf) + 1;
if (ptr = new char[stat = size])
{
for (*(ptr += (size - 1)) = '\0'; bufptr != buf; *--ptr = *--bufptr)
;
return ptr;
}
else
return NULL;
}
/* Reads an arbitrarily MXINT32 input line terminated by TERMINATOR.
This routine allocates its own memory, so the user should
only supply the address of a (char *). */
TextFile& TextFile::gets(char **s, char terminator)
{
if (!readable())
{
set(_fail);
return *this;
}
return failif(!(*s = readline (0, terminator)));
}
#ifndef VMS
TextFile& TextFile::scan(const char* fmt ...)
{
if (readable())
{
va_list args;
va_start(args, fmt);
#ifndef HAVE_VSCANF
stat = _doscan(fp, fmt, args);
#else
stat = vfscanf(fp, fmt, args);
#endif
va_end(args);
failif(stat <= 0);
}
return *this;
}
#endif
TextFile& TextFile::form(const char* fmt ...)
{
va_list args;
va_start(args, fmt);
#ifndef HAVE_VPRINTF
stat = _doprnt(fmt, args, fp);
#ifdef HAVE_VOID_DOPRNT
stat = ferror(fp) ? -1 : 0;
#endif
#else
stat = vfprintf(fp, fmt, args);
#endif
va_end(args);
failif(stat < 0);
return *this;
}
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