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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "utils.h"
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void *xmalloc(size_t size)
{
void *p = malloc(size);
if (p == NULL) {
fprintf(stderr, "Failed to allocate memory\n");
abort();
}
return p;
}
char *to_chars(const CHAR16 uchars[], size_t size)
{
char *chars = xmalloc(size / 2 + 1);
const CHAR16 *from = uchars;
char *to = chars;
while (*from != 0) {
CHAR16 uc = *from++;
if (uc < CHAR_MAX)
*to++ = uc;
else
*to++ = '?';
}
// In case there was no terminating NUL.
if (to != chars && to[-1] != '\0')
*to = '\0';
return chars;
}
CHAR16 *to_uchars(const char chars[], size_t *size)
{
*size = (strlen(chars) + 1) * 2;
CHAR16 *uchars = xmalloc(*size);
const char *from = chars;
CHAR16 *to = uchars;
while (*from != '\0')
*to++ = *from++;
*to = 0;
return uchars;
}
bool str_eq(const char lhs[], const char rhs[])
{
return strcmp(lhs, rhs) == 0;
}
struct mem_range_t map_file(const char path[], bool rw)
{
struct mem_range_t range = {0};
int open_flags = rw ? O_RDWR : O_RDONLY;
int mmap_flags = rw ? PROT_READ | PROT_WRITE : PROT_READ;
int fd = open(path, open_flags);
if (fd == -1) {
fprintf(stderr, "Failed to open(): %s\n", strerror(errno));
return range;
}
struct stat stat_buf;
if (fstat(fd, &stat_buf) != 0) {
(void)close(fd);
fprintf(stderr, "Failed to fstat(): %s\n", strerror(errno));
return range;
}
if (stat_buf.st_size == 0) {
(void)close(fd);
fprintf(stderr, "Can't map an empty \"%s\" file\n", path);
return range;
}
uint8_t *mem = mmap(/*addr=*/NULL, stat_buf.st_size, mmap_flags,
MAP_SHARED | MAP_POPULATE, fd, /*offset=*/0);
(void)close(fd);
if (mem == MAP_FAILED) {
fprintf(stderr, "Failed to mmap(): %s\n", strerror(errno));
return range;
}
range.start = mem;
range.length = stat_buf.st_size;
return range;
}
void unmap_file(struct mem_range_t store)
{
if (munmap(store.start, store.length) != 0)
fprintf(stderr, "Failed to munmap(): %s\n", strerror(errno));
}
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