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/* linebuffer.c -- read arbitrarily long lines
Copyright (C) 1986, 1991, 1998-1999, 2001, 2003-2004, 2006-2007, 2009-2022
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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
/* Written by Richard Stallman. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include "linebuffer.h"
#include "xalloc.h"
#if USE_UNLOCKED_IO
# include "unlocked-io.h"
#endif
/* Initialize linebuffer LINEBUFFER for use. */
void
initbuffer (struct linebuffer *linebuffer)
{
memset (linebuffer, 0, sizeof *linebuffer);
}
struct linebuffer *
readlinebuffer (struct linebuffer *linebuffer, FILE *stream)
{
return readlinebuffer_delim (linebuffer, stream, '\n');
}
/* Read an arbitrarily long line of text from STREAM into LINEBUFFER.
Consider lines to be terminated by DELIMITER.
Keep the delimiter; append DELIMITER if it's the last line of a file
that ends in a character other than DELIMITER. Do not NUL-terminate.
Therefore the stream can contain NUL bytes, and the length
(including the delimiter) is returned in linebuffer->length.
Return NULL when stream is empty. Return NULL and set errno upon
error; callers can distinguish this case from the empty case by
invoking ferror (stream).
Otherwise, return LINEBUFFER. */
struct linebuffer *
readlinebuffer_delim (struct linebuffer *linebuffer, FILE *stream,
char delimiter)
{
int c;
char *buffer = linebuffer->buffer;
char *p = linebuffer->buffer;
char *end = buffer + linebuffer->size; /* Sentinel. */
if (feof (stream))
return NULL;
do
{
c = getc (stream);
if (c == EOF)
{
if (p == buffer || ferror (stream))
return NULL;
if (p[-1] == delimiter)
break;
c = delimiter;
}
if (p == end)
{
idx_t oldsize = linebuffer->size;
buffer = xpalloc (buffer, &linebuffer->size, 1, -1, 1);
p = buffer + oldsize;
linebuffer->buffer = buffer;
end = buffer + linebuffer->size;
}
*p++ = c;
}
while (c != delimiter);
linebuffer->length = p - buffer;
return linebuffer;
}
/* Free the buffer that was allocated for linebuffer LINEBUFFER. */
void
freebuffer (struct linebuffer *linebuffer)
{
free (linebuffer->buffer);
}
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