/* Variable-sized buffer with on-stack default allocation. Copyright (C) 2015-2021 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library 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 of the License, or (at your option) any later version. The GNU C Library 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 the GNU C Library; if not, see . */ #ifndef _LIBC # include #endif #include #include bool __libc_scratch_buffer_grow (struct scratch_buffer *buffer) { void *new_ptr; size_t new_length = buffer->length * 2; /* Discard old buffer. */ scratch_buffer_free (buffer); /* Check for overflow. */ if (__glibc_likely (new_length >= buffer->length)) new_ptr = malloc (new_length); else { __set_errno (ENOMEM); new_ptr = NULL; } if (__glibc_unlikely (new_ptr == NULL)) { /* Buffer must remain valid to free. */ scratch_buffer_init (buffer); return false; } /* Install new heap-based buffer. */ buffer->data = new_ptr; buffer->length = new_length; return true; } libc_hidden_def (__libc_scratch_buffer_grow)