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