148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/* getdelim.c --- Implementation of replacement getdelim function.
|
|
Copyright (C) 1994, 1996-1998, 2001, 2003, 2005-2022 Free Software
|
|
Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
/* Ported from glibc by Simon Josefsson. */
|
|
|
|
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
|
|
optimizes away the lineptr == NULL || n == NULL || fp == NULL tests below. */
|
|
#define _GL_ARG_NONNULL(params)
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
|
|
#ifndef SSIZE_MAX
|
|
# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
|
|
#endif
|
|
|
|
#if USE_UNLOCKED_IO
|
|
# include "unlocked-io.h"
|
|
# define getc_maybe_unlocked(fp) getc(fp)
|
|
#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED
|
|
# undef flockfile
|
|
# undef funlockfile
|
|
# define flockfile(x) ((void) 0)
|
|
# define funlockfile(x) ((void) 0)
|
|
# define getc_maybe_unlocked(fp) getc(fp)
|
|
#else
|
|
# define getc_maybe_unlocked(fp) getc_unlocked(fp)
|
|
#endif
|
|
|
|
static void
|
|
alloc_failed (void)
|
|
{
|
|
#if defined _WIN32 && ! defined __CYGWIN__
|
|
/* Avoid errno problem without using the realloc module; see:
|
|
https://lists.gnu.org/r/bug-gnulib/2016-08/msg00025.html */
|
|
errno = ENOMEM;
|
|
#endif
|
|
}
|
|
|
|
/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
|
|
NUL-terminate it). *LINEPTR is a pointer returned from malloc (or
|
|
NULL), pointing to *N characters of space. It is realloc'ed as
|
|
necessary. Returns the number of characters read (not including
|
|
the null terminator), or -1 on error or EOF. */
|
|
|
|
ssize_t
|
|
getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
|
|
{
|
|
ssize_t result;
|
|
size_t cur_len = 0;
|
|
|
|
if (lineptr == NULL || n == NULL || fp == NULL)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
flockfile (fp);
|
|
|
|
if (*lineptr == NULL || *n == 0)
|
|
{
|
|
char *new_lineptr;
|
|
*n = 120;
|
|
new_lineptr = (char *) realloc (*lineptr, *n);
|
|
if (new_lineptr == NULL)
|
|
{
|
|
alloc_failed ();
|
|
result = -1;
|
|
goto unlock_return;
|
|
}
|
|
*lineptr = new_lineptr;
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
int i;
|
|
|
|
i = getc_maybe_unlocked (fp);
|
|
if (i == EOF)
|
|
{
|
|
result = -1;
|
|
break;
|
|
}
|
|
|
|
/* Make enough space for len+1 (for final NUL) bytes. */
|
|
if (cur_len + 1 >= *n)
|
|
{
|
|
size_t needed_max =
|
|
SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
|
|
size_t needed = 2 * *n + 1; /* Be generous. */
|
|
char *new_lineptr;
|
|
|
|
if (needed_max < needed)
|
|
needed = needed_max;
|
|
if (cur_len + 1 >= needed)
|
|
{
|
|
result = -1;
|
|
errno = EOVERFLOW;
|
|
goto unlock_return;
|
|
}
|
|
|
|
new_lineptr = (char *) realloc (*lineptr, needed);
|
|
if (new_lineptr == NULL)
|
|
{
|
|
alloc_failed ();
|
|
result = -1;
|
|
goto unlock_return;
|
|
}
|
|
|
|
*lineptr = new_lineptr;
|
|
*n = needed;
|
|
}
|
|
|
|
(*lineptr)[cur_len] = i;
|
|
cur_len++;
|
|
|
|
if (i == delimiter)
|
|
break;
|
|
}
|
|
(*lineptr)[cur_len] = '\0';
|
|
result = cur_len ? cur_len : result;
|
|
|
|
unlock_return:
|
|
funlockfile (fp); /* doesn't set errno */
|
|
|
|
return result;
|
|
}
|