Sergii Dmytruk | 04bd965 | 2023-11-17 19:31:20 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | |
| 3 | #include "utils.h" |
| 4 | |
| 5 | #include <sys/mman.h> |
| 6 | #include <sys/stat.h> |
| 7 | #include <fcntl.h> |
| 8 | #include <unistd.h> |
| 9 | |
| 10 | #include <errno.h> |
| 11 | #include <limits.h> |
| 12 | #include <stdbool.h> |
| 13 | #include <stddef.h> |
| 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
| 16 | #include <string.h> |
| 17 | |
| 18 | void *xmalloc(size_t size) |
| 19 | { |
| 20 | void *p = malloc(size); |
| 21 | if (p == NULL) { |
| 22 | fprintf(stderr, "Failed to allocate memory\n"); |
| 23 | abort(); |
| 24 | } |
| 25 | return p; |
| 26 | } |
| 27 | |
| 28 | char *to_chars(const CHAR16 uchars[], size_t size) |
| 29 | { |
| 30 | char *chars = xmalloc(size / 2 + 1); |
| 31 | |
| 32 | const CHAR16 *from = uchars; |
| 33 | char *to = chars; |
| 34 | while (*from != 0) { |
| 35 | CHAR16 uc = *from++; |
| 36 | if (uc < CHAR_MAX) |
| 37 | *to++ = uc; |
| 38 | else |
| 39 | *to++ = '?'; |
| 40 | } |
| 41 | |
| 42 | // In case there was no terminating NUL. |
| 43 | if (to != chars && to[-1] != '\0') |
| 44 | *to = '\0'; |
| 45 | |
| 46 | return chars; |
| 47 | } |
| 48 | |
| 49 | CHAR16 *to_uchars(const char chars[], size_t *size) |
| 50 | { |
| 51 | *size = (strlen(chars) + 1) * 2; |
| 52 | CHAR16 *uchars = xmalloc(*size); |
| 53 | |
| 54 | const char *from = chars; |
| 55 | CHAR16 *to = uchars; |
| 56 | while (*from != '\0') |
| 57 | *to++ = *from++; |
| 58 | *to = 0; |
| 59 | |
| 60 | return uchars; |
| 61 | } |
| 62 | |
| 63 | bool str_eq(const char lhs[], const char rhs[]) |
| 64 | { |
| 65 | return strcmp(lhs, rhs) == 0; |
| 66 | } |
| 67 | |
| 68 | struct mem_range_t map_file(const char path[], bool rw) |
| 69 | { |
| 70 | struct mem_range_t range = {0}; |
| 71 | |
| 72 | int open_flags = rw ? O_RDWR : O_RDONLY; |
| 73 | int mmap_flags = rw ? PROT_READ | PROT_WRITE : PROT_READ; |
| 74 | |
| 75 | int fd = open(path, open_flags); |
| 76 | if (fd == -1) { |
| 77 | fprintf(stderr, "Failed to open(): %s\n", strerror(errno)); |
| 78 | return range; |
| 79 | } |
| 80 | |
| 81 | struct stat stat_buf; |
| 82 | if (fstat(fd, &stat_buf) != 0) { |
| 83 | (void)close(fd); |
| 84 | fprintf(stderr, "Failed to fstat(): %s\n", strerror(errno)); |
| 85 | return range; |
| 86 | } |
| 87 | |
| 88 | if (stat_buf.st_size == 0) { |
| 89 | (void)close(fd); |
| 90 | fprintf(stderr, "Can't map an empty \"%s\" file\n", path); |
| 91 | return range; |
| 92 | } |
| 93 | |
| 94 | uint8_t *mem = mmap(/*addr=*/NULL, stat_buf.st_size, mmap_flags, |
| 95 | MAP_SHARED | MAP_POPULATE, fd, /*offset=*/0); |
| 96 | (void)close(fd); |
| 97 | if (mem == MAP_FAILED) { |
| 98 | fprintf(stderr, "Failed to mmap(): %s\n", strerror(errno)); |
| 99 | return range; |
| 100 | } |
| 101 | |
| 102 | range.start = mem; |
| 103 | range.length = stat_buf.st_size; |
| 104 | return range; |
| 105 | } |
| 106 | |
| 107 | void unmap_file(struct mem_range_t store) |
| 108 | { |
| 109 | if (munmap(store.start, store.length) != 0) |
| 110 | fprintf(stderr, "Failed to munmap(): %s\n", strerror(errno)); |
| 111 | } |