177 lines
4.0 KiB
C
177 lines
4.0 KiB
C
/* Copyright (C) 1991, 1992, 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <errno.h>
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/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
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(and null-terminate it). *LINEPTR is a pointer returned from malloc (or
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NULL), pointing to *N characters of space. It is realloc'd as
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necessary. Returns the number of characters read (not including the
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null terminator), or -1 on error or EOF. */
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ssize_t
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__getdelim (lineptr, n, terminator, stream)
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char **lineptr;
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size_t *n;
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int terminator;
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FILE *stream;
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{
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char *line, *p;
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size_t size, copy;
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if (!__validfp (stream) || lineptr == NULL || n == NULL)
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{
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__set_errno (EINVAL);
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return -1;
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}
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if (ferror (stream))
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return -1;
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/* Make sure we have a line buffer to start with. */
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if (*lineptr == NULL || *n < 2) /* !seen and no buf yet need 2 chars. */
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{
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#ifndef MAX_CANON
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#define MAX_CANON 256
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#endif
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line = realloc (*lineptr, MAX_CANON);
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if (line == NULL)
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return -1;
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*lineptr = line;
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*n = MAX_CANON;
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}
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line = *lineptr;
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size = *n;
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copy = size;
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p = line;
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if (stream->__buffer == NULL && stream->__userbuf)
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{
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/* Unbuffered stream. Not much optimization to do. */
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while (1)
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{
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size_t len;
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while (--copy > 0)
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{
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register int c = getc (stream);
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if (c == EOF)
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goto lose;
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else if ((*p++ = c) == terminator)
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goto win;
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}
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/* Need to enlarge the line buffer. */
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len = p - line;
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size *= 2;
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line = realloc (line, size);
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if (line == NULL)
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goto lose;
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*lineptr = line;
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*n = size;
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p = line + len;
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copy = size - len;
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}
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}
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else
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{
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/* Leave space for the terminating null. */
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--copy;
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if (!stream->__seen || stream->__buffer == NULL || stream->__pushed_back)
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{
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/* Do one with getc to allocate a buffer. */
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int c = getc (stream);
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if (c == EOF)
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goto lose;
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*p++ = c;
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if (c == terminator)
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goto win;
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--copy;
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}
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while (1)
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{
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size_t i;
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char *found;
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i = stream->__get_limit - stream->__bufp;
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if (i == 0)
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{
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/* Refill the buffer. */
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int c = __fillbf (stream);
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if (c == EOF)
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goto lose;
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*p++ = c;
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if (c == terminator)
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goto win;
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--copy;
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i = stream->__get_limit - stream->__bufp;
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}
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if (i > copy)
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i = copy;
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found = (char *) __memccpy ((PTR) p, stream->__bufp, terminator, i);
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if (found != NULL)
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{
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stream->__bufp += found - p;
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p = found;
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goto win;
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}
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stream->__bufp += i;
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p += i;
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copy -= i;
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if (copy == 0)
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{
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/* Need to enlarge the line buffer. */
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size_t len = p - line;
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size *= 2;
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line = realloc (line, size);
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if (line == NULL)
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goto lose;
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*lineptr = line;
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*n = size;
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p = line + len;
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copy = size - len;
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/* Leave space for the terminating null. */
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--copy;
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}
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}
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}
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lose:
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if (p == *lineptr)
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return -1;
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/* Return a partial line since we got an error in the middle. */
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win:
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*p = '\0';
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return p - *lineptr;
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}
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weak_alias (__getdelim, getdelim)
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