I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
220 lines
5.8 KiB
C
220 lines
5.8 KiB
C
/*
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* Copyright (c) 2014, 2015 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* libc/stdio/fmemopen.c
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* Open a memory buffer stream.
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*/
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#include <sys/types.h>
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#include <errno.h>
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#include <FILE.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static const int FMEMOPEN_ALLOCATED = 1 << 0;
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struct fmemopen_state
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{
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unsigned char* buffer;
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size_t buffer_true_size;
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size_t buffer_size;
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size_t buffer_offset;
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size_t buffer_used;
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int flags;
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int mode;
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};
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static ssize_t fmemopen_read(void* state_ptr, void* dst, size_t count)
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{
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struct fmemopen_state* state = (struct fmemopen_state*) state_ptr;
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if ( !(state->mode & FILE_MODE_READ) )
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return errno = EBADF, -1;
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if ( (size_t) SSIZE_MAX < count )
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count = SSIZE_MAX;
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if ( state->buffer_used < state->buffer_offset )
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return 0;
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size_t available = state->buffer_used - state->buffer_offset;
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if ( available < count )
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count = available;
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memcpy(dst, state->buffer + state->buffer_offset, count);
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state->buffer_offset += count;
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return count;
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}
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static ssize_t fmemopen_write(void* state_ptr, const void* src, size_t count)
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{
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struct fmemopen_state* state = (struct fmemopen_state*) state_ptr;
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if ( !(state->mode & FILE_MODE_WRITE) )
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return errno = EBADF, -1;
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if ( (size_t) SSIZE_MAX < count )
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count = SSIZE_MAX;
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if ( state->mode & FILE_MODE_APPEND )
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state->buffer_offset = state->buffer_used;
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if ( state->buffer_used < state->buffer_offset )
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{
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size_t distance = state->buffer_offset - state->buffer_used;
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memset(state->buffer + state->buffer_used, 0, distance);
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state->buffer_used = state->buffer_offset;
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}
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size_t available = state->buffer_size - state->buffer_offset;
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if ( available < count )
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count = available;
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memcpy(state->buffer + state->buffer_offset, src, count);
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state->buffer_offset += count;
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if ( state->buffer_used < state->buffer_offset )
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{
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state->buffer_used = state->buffer_offset;
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if ( !(state->mode & FILE_MODE_BINARY) )
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{
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if ( state->buffer_used < state->buffer_true_size )
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state->buffer[state->buffer_used] = '\0';
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}
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}
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return count;
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}
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static off_t fmemopen_seek(void* state_ptr, off_t offset, int whence)
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{
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struct fmemopen_state* state = (struct fmemopen_state*) state_ptr;
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off_t base;
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switch ( whence )
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{
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case SEEK_SET: base = 0; break;
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case SEEK_CUR: base = (off_t) state->buffer_offset; break;
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case SEEK_END: base = (off_t) state->buffer_used; break;
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default: return errno = EINVAL, -1;
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}
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if ( offset < -base || base - (off_t) state->buffer_size < offset )
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return errno = EOVERFLOW, -1;
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return (off_t) (state->buffer_offset = (size_t) (base + offset));
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}
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static int fmemopen_close(void* state_ptr)
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{
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struct fmemopen_state* state = (struct fmemopen_state*) state_ptr;
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if ( state->flags & FMEMOPEN_ALLOCATED )
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free(state->buffer);
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return 0;
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}
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FILE* fmemopen(void* restrict buffer_ptr,
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size_t buffer_size,
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const char* restrict mode_str)
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{
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int flags = 0;
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int mode = fparsemode(mode_str);
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if ( mode < 0 )
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return (FILE*) NULL;
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if ( mode & ~(FILE_MODE_READ | FILE_MODE_WRITE | FILE_MODE_CREATE |
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FILE_MODE_BINARY | FILE_MODE_TRUNCATE | FILE_MODE_APPEND) )
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return errno = EINVAL, (FILE*) NULL;
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#if OFF_MAX < SIZE_MAX
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if ( (uintmax_t) OFF_MAX < (uintmax_t) buffer_size )
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return errno = EOVERFLOW, (FILE*) NULL;
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#endif
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if ( !(mode & FILE_MODE_BINARY) &&
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(mode & FILE_MODE_WRITE) &&
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!(mode & FILE_MODE_READ) &&
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buffer_size == 0 )
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return errno = EINVAL, (FILE*) NULL;
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void* allocated_buffer = NULL;
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if ( !buffer_ptr )
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{
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if ( !(buffer_ptr = allocated_buffer = calloc(buffer_size, 1)) )
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return (FILE*) NULL;
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flags |= FMEMOPEN_ALLOCATED;
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}
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struct fmemopen_state* state =
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(struct fmemopen_state*) malloc(sizeof(struct fmemopen_state));
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if ( !state )
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return free(allocated_buffer), (FILE*) NULL;
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FILE* fp = fnewfile();
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if ( !fp )
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return free(state), free(allocated_buffer), (FILE*) NULL;
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memset(state, 0, sizeof(*state));
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state->flags = flags;
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state->mode = mode;
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state->buffer = (unsigned char*) buffer_ptr;
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state->buffer_size = buffer_size;
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state->buffer_true_size = buffer_size;
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if ( !(mode & FILE_MODE_BINARY) &&
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(mode & FILE_MODE_WRITE) &&
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!(mode & FILE_MODE_READ) )
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state->buffer_size = state->buffer_true_size - 1;
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if ( (mode & FILE_MODE_APPEND) && !(mode & FILE_MODE_BINARY) )
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{
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state->buffer_offset = strnlen((const char*) state->buffer, state->buffer_size);
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state->buffer_used = state->buffer_offset;
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}
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else if ( mode & FILE_MODE_TRUNCATE )
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{
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state->buffer_offset = 0;
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state->buffer_used = 0;
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}
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else
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{
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state->buffer_offset = 0;
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state->buffer_used = state->buffer_size;
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}
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if ( !(state->mode & FILE_MODE_BINARY) && (mode & FILE_MODE_WRITE) )
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{
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if ( state->buffer_used < state->buffer_true_size )
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state->buffer[state->buffer_used] = '\0';
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}
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if ( mode & FILE_MODE_READ )
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fp->flags |= _FILE_READABLE;
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if ( mode & FILE_MODE_WRITE )
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fp->flags |= _FILE_WRITABLE;
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fp->fd = -1;
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fp->user = state;
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fp->read_func = fmemopen_read;
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fp->write_func = fmemopen_write;
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fp->seek_func = fmemopen_seek;
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fp->close_func = fmemopen_close;
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return fp;
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}
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