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- /* getdelim.c --- Implementation of replacement getdelim function.
- Copyright (C) 1994, 1996-1998, 2001, 2003, 2005-2021 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, 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/>. */
- /* 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;
- }
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