universe@15: /*
universe@15:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@15:  * Copyright 2023 Mike Becker. All rights reserved.
universe@15:  *
universe@15:  * Redistribution and use in source and binary forms, with or without
universe@15:  * modification, are permitted provided that the following conditions are met:
universe@15:  *
universe@15:  *   1. Redistributions of source code must retain the above copyright
universe@15:  *      notice, this list of conditions and the following disclaimer.
universe@15:  *
universe@15:  *   2. Redistributions in binary form must reproduce the above copyright
universe@15:  *      notice, this list of conditions and the following disclaimer in the
universe@15:  *      documentation and/or other materials provided with the distribution.
universe@15:  *
universe@15:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@15:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@15:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@15:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@15:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@15:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@15:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@15:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@15:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@15:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@15:  * POSSIBILITY OF SUCH DAMAGE.
universe@15:  */
universe@15: 
universe@15: #include "ascension/files.h"
universe@15: #include "ascension/error.h"
universe@15: 
universe@15: #include <sys/mman.h>
universe@15: #include <sys/stat.h>
universe@15: #include <fcntl.h>
universe@15: #include <unistd.h>
universe@15: 
universe@15: asc_file asc_file_mmap_rdonly(char const *filename) {
universe@15:     int fd = open(filename, O_RDONLY);
universe@15:     if (fd < 0) {
universe@15:         asc_dprintf("Failed to open file %s", filename);
universe@15:         return (cxstring) {NULL, 0};
universe@15:     }
universe@15: 
universe@15:     struct stat statbuf;
universe@15:     int err = fstat(fd, &statbuf);
universe@15:     if (err < 0) {
universe@15:         close(fd);
universe@15:         asc_dprintf("Failed to stat file %s", filename);
universe@15:         return (cxstring) {NULL, 0};
universe@15:     }
universe@15: 
universe@15:     char const *data = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0);
universe@15:     if (data == MAP_FAILED) {
universe@15:         close(fd);
universe@15:         asc_dprintf("Failed to map file %s into memory", filename);
universe@15:         return (cxstring) {NULL, 0};
universe@15:     }
universe@15:     close(fd);
universe@15: 
universe@15:     return cx_strn(data, statbuf.st_size);
universe@15: }
universe@15: 
universe@15: void asc_file_unmap(asc_file file) {
universe@15:     munmap((void *) file.ptr, file.length);
universe@15: }