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/* getndelim2 - Read a line from a stream, stopping at one of 2 delimiters,
with bounded memory allocation.
Copyright (C) 1993, 1996, 1997, 1998, 2000, 2003 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Originally written by Jan Brittenson, bson@gnu.ai.mit.edu. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
/* Specification. */
#include "getndelim2.h"
#include <stdlib.h>
#include "unlocked-io.h"
/* Always add at least this many bytes when extending the buffer. */
#define MIN_CHUNK 64
ssize_t
getndelim2 (char **lineptr, size_t *linesize, size_t nmax,
FILE *stream, int delim1, int delim2, size_t offset)
{
size_t nbytes_avail; /* Allocated but unused chars in *LINEPTR. */
char *read_pos; /* Where we're reading into *LINEPTR. */
if (!lineptr || !linesize || !nmax || !stream)
return -1;
if (!*lineptr)
{
size_t newlinesize = MIN_CHUNK;
if (newlinesize > nmax)
newlinesize = nmax;
*linesize = newlinesize;
*lineptr = malloc (*linesize);
if (!*lineptr)
return -1;
}
if (*linesize < offset)
return -1;
nbytes_avail = *linesize - offset;
read_pos = *lineptr + offset;
if (nbytes_avail == 0 && *linesize >= nmax)
return -1;
for (;;)
{
/* Here always *lineptr + *linesize == read_pos + nbytes_avail. */
register int c;
/* We always want at least one char left in the buffer, since we
always (unless we get an error while reading the first char)
NUL-terminate the line buffer. */
if (nbytes_avail < 2 && *linesize < nmax)
{
size_t newlinesize =
(*linesize > MIN_CHUNK ? 2 * *linesize : *linesize + MIN_CHUNK);
if (! (*linesize < newlinesize && newlinesize <= nmax))
newlinesize = nmax;
*linesize = newlinesize;
nbytes_avail = *linesize + *lineptr - read_pos;
*lineptr = realloc (*lineptr, *linesize);
if (!*lineptr)
return -1;
read_pos = *linesize - nbytes_avail + *lineptr;
}
c = getc (stream);
if (c == EOF)
{
/* Return partial line, if any. */
if (read_pos == *lineptr)
return -1;
else
break;
}
if (nbytes_avail >= 2)
{
*read_pos++ = c;
nbytes_avail--;
}
if (c == delim1 || (delim2 && c == delim2))
/* Return the line. */
break;
}
/* Done - NUL terminate and return the number of chars read.
At this point we know that nbytes_avail >= 1. */
*read_pos = '\0';
return read_pos - (*lineptr + offset);
}
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