147 lines
3.9 KiB
C
147 lines
3.9 KiB
C
/* getdelim.c --- Implementation of replacement getdelim function.
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Copyright (C) 1994, 1996-1998, 2001, 2003, 2005-2023 Free Software
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Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Ported from glibc by Simon Josefsson. */
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/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
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optimizes away the lineptr == NULL || n == NULL || fp == NULL tests below. */
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#define _GL_ARG_NONNULL(params)
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#include <config.h>
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#include <stdio.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifndef SSIZE_MAX
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# define SSIZE_MAX ((ssize_t) (SIZE_MAX / 2))
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#endif
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#if USE_UNLOCKED_IO
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# include "unlocked-io.h"
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# define getc_maybe_unlocked(fp) getc(fp)
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#elif !HAVE_FLOCKFILE || !HAVE_FUNLOCKFILE || !HAVE_DECL_GETC_UNLOCKED
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# undef flockfile
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# undef funlockfile
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# define flockfile(x) ((void) 0)
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# define funlockfile(x) ((void) 0)
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# define getc_maybe_unlocked(fp) getc(fp)
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#else
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# define getc_maybe_unlocked(fp) getc_unlocked(fp)
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#endif
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static void
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alloc_failed (void)
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{
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#if defined _WIN32 && ! defined __CYGWIN__
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/* Avoid errno problem without using the realloc module; see:
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https://lists.gnu.org/r/bug-gnulib/2016-08/msg00025.html */
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errno = ENOMEM;
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#endif
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}
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/* Read up to (and including) a DELIMITER from FP into *LINEPTR (and
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NUL-terminate it). *LINEPTR is a pointer returned from malloc (or
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NULL), pointing to *N characters of space. It is realloc'ed as
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necessary. Returns the number of characters read (not including
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the null terminator), or -1 on error or EOF. */
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ssize_t
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getdelim (char **lineptr, size_t *n, int delimiter, FILE *fp)
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{
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ssize_t result;
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size_t cur_len = 0;
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if (lineptr == NULL || n == NULL || fp == NULL)
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{
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errno = EINVAL;
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return -1;
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}
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flockfile (fp);
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if (*lineptr == NULL || *n == 0)
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{
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char *new_lineptr;
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*n = 120;
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new_lineptr = (char *) realloc (*lineptr, *n);
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if (new_lineptr == NULL)
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{
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alloc_failed ();
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result = -1;
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goto unlock_return;
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}
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*lineptr = new_lineptr;
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}
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for (;;)
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{
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int i;
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i = getc_maybe_unlocked (fp);
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if (i == EOF)
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{
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result = -1;
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break;
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}
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/* Make enough space for len+1 (for final NUL) bytes. */
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if (cur_len + 1 >= *n)
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{
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size_t needed_max =
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SSIZE_MAX < SIZE_MAX ? (size_t) SSIZE_MAX + 1 : SIZE_MAX;
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size_t needed = 2 * *n + 1; /* Be generous. */
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char *new_lineptr;
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if (needed_max < needed)
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needed = needed_max;
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if (cur_len + 1 >= needed)
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{
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result = -1;
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errno = EOVERFLOW;
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goto unlock_return;
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}
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new_lineptr = (char *) realloc (*lineptr, needed);
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if (new_lineptr == NULL)
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{
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alloc_failed ();
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result = -1;
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goto unlock_return;
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}
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*lineptr = new_lineptr;
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*n = needed;
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}
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(*lineptr)[cur_len] = i;
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cur_len++;
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if (i == delimiter)
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break;
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}
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(*lineptr)[cur_len] = '\0';
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result = cur_len ? cur_len : result;
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unlock_return:
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funlockfile (fp); /* doesn't set errno */
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return result;
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}
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