127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* Copyright (C) 1994-2022 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include <stdlib.h>
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#include "libioP.h"
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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/* Read up to (and including) a TERMINATOR from FP 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'ed 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 (char **lineptr, size_t *n, int delimiter, FILE *fp)
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{
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ssize_t result;
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ssize_t cur_len = 0;
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ssize_t len;
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if (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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CHECK_FILE (fp, -1);
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_IO_acquire_lock (fp);
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if (_IO_ferror_unlocked (fp))
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{
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result = -1;
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goto unlock_return;
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}
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if (*lineptr == NULL || *n == 0)
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{
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*n = 120;
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*lineptr = (char *) malloc (*n);
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if (*lineptr == NULL)
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{
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result = -1;
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goto unlock_return;
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}
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}
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len = fp->_IO_read_end - fp->_IO_read_ptr;
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if (len <= 0)
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{
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if (__underflow (fp) == EOF)
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{
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result = -1;
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goto unlock_return;
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}
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len = fp->_IO_read_end - fp->_IO_read_ptr;
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}
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for (;;)
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{
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size_t needed;
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char *t;
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t = (char *) memchr ((void *) fp->_IO_read_ptr, delimiter, len);
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if (t != NULL)
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len = (t - fp->_IO_read_ptr) + 1;
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if (__glibc_unlikely (len >= SSIZE_MAX - cur_len))
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{
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__set_errno (EOVERFLOW);
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result = -1;
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goto unlock_return;
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}
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/* Make enough space for len+1 (for final NUL) bytes. */
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needed = cur_len + len + 1;
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if (needed > *n)
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{
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char *new_lineptr;
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if (needed < 2 * *n)
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needed = 2 * *n; /* Be generous. */
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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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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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memcpy (*lineptr + cur_len, (void *) fp->_IO_read_ptr, len);
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fp->_IO_read_ptr += len;
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cur_len += len;
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if (t != NULL || __underflow (fp) == EOF)
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break;
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len = fp->_IO_read_end - fp->_IO_read_ptr;
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}
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(*lineptr)[cur_len] = '\0';
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result = cur_len;
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unlock_return:
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_IO_release_lock (fp);
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return result;
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}
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libc_hidden_def (__getdelim)
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weak_alias (__getdelim, getdelim)
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