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/* linebuffer.c -- read arbitrarily long lines
Copyright (C) 1986, 1991 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Written by Richard Stallman. */
#include <stdio.h>
#include "linebuffer.h"
char *xmalloc ();
char *xrealloc ();
void free ();
/* Initialize linebuffer LINEBUFFER for use. */
void
initbuffer (linebuffer)
struct linebuffer *linebuffer;
{
linebuffer->length = 0;
linebuffer->size = 200;
linebuffer->buffer = (char *) xmalloc (linebuffer->size);
}
/* Read an arbitrarily long line of text from STREAM into LINEBUFFER.
Remove any newline. Does not null terminate.
Return LINEBUFFER, except at end of file return 0. */
struct linebuffer *
readline (linebuffer, stream)
struct linebuffer *linebuffer;
FILE *stream;
{
int c;
char *buffer = linebuffer->buffer;
char *p = linebuffer->buffer;
char *end = buffer + linebuffer->size; /* Sentinel. */
if (feof (stream))
{
linebuffer->length = 0;
return 0;
}
while (1)
{
c = getc (stream);
if (p == end)
{
linebuffer->size *= 2;
buffer = (char *) xrealloc (buffer, linebuffer->size);
p += buffer - linebuffer->buffer;
linebuffer->buffer = buffer;
end = buffer + linebuffer->size;
}
if (c == EOF || c == '\n')
break;
*p++ = c;
}
if (feof (stream) && p == buffer)
{
linebuffer->length = 0;
return 0;
}
linebuffer->length = p - linebuffer->buffer;
return linebuffer;
}
/* Free linebuffer LINEBUFFER and its data, all allocated with malloc. */
void
freebuffer (linebuffer)
struct linebuffer *linebuffer;
{
free (linebuffer->buffer);
free (linebuffer);
}
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