comparison: src/files.c
src/files.c
- changeset 15
- 362b7659dc76
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| 14:9dbfc0031887 | 15:362b7659dc76 |
|---|---|
| 1 /* | |
| 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
| 3 * Copyright 2023 Mike Becker. All rights reserved. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * | |
| 11 * 2. Redistributions in binary form must reproduce the above copyright | |
| 12 * notice, this list of conditions and the following disclaimer in the | |
| 13 * documentation and/or other materials provided with the distribution. | |
| 14 * | |
| 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
| 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 25 * POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "ascension/files.h" | |
| 29 #include "ascension/error.h" | |
| 30 | |
| 31 #include <sys/mman.h> | |
| 32 #include <sys/stat.h> | |
| 33 #include <fcntl.h> | |
| 34 #include <unistd.h> | |
| 35 | |
| 36 asc_file asc_file_mmap_rdonly(char const *filename) { | |
| 37 int fd = open(filename, O_RDONLY); | |
| 38 if (fd < 0) { | |
| 39 asc_dprintf("Failed to open file %s", filename); | |
| 40 return (cxstring) {NULL, 0}; | |
| 41 } | |
| 42 | |
| 43 struct stat statbuf; | |
| 44 int err = fstat(fd, &statbuf); | |
| 45 if (err < 0) { | |
| 46 close(fd); | |
| 47 asc_dprintf("Failed to stat file %s", filename); | |
| 48 return (cxstring) {NULL, 0}; | |
| 49 } | |
| 50 | |
| 51 char const *data = mmap(NULL, statbuf.st_size, PROT_READ, MAP_SHARED, fd, 0); | |
| 52 if (data == MAP_FAILED) { | |
| 53 close(fd); | |
| 54 asc_dprintf("Failed to map file %s into memory", filename); | |
| 55 return (cxstring) {NULL, 0}; | |
| 56 } | |
| 57 close(fd); | |
| 58 | |
| 59 return cx_strn(data, statbuf.st_size); | |
| 60 } | |
| 61 | |
| 62 void asc_file_unmap(asc_file file) { | |
| 63 munmap((void *) file.ptr, file.length); | |
| 64 } |
