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#include "../../include/std/file.h"
#include "../../include/std/mem.h"
#include "../../include/std/log.h"
#include "../../include/std/alloc.h"
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#define SCANDIR_PATH_LENGTH 4096
static int scan_dir_recursive_internal(char *dir_path, int path_length, scan_dir_callback_func callback_func, void *userdata) {
DIR *dir;
struct dirent *entry;
struct stat file_stats;
int filename_length;
int path_length_start;
path_length_start = path_length;
if((dir = opendir(dir_path)) == NULL) {
int error;
error = errno;
amal_log_perror("scan_dir_recursive");
return error;
}
while((entry = readdir(dir)) != NULL) {
/*
Skip hidden files. Name will always at least include null terminator
so it's ok to not check filename length. And file names are never empty, right???
*/
if(entry->d_name[0] == '.')
continue;
/* Reset path concat, because it's overwritten by recursive call to scan dir */
path_length = path_length_start;
filename_length = strlen(entry->d_name);
/* current path '/' filename '\0' */
if(path_length + 1 + filename_length + 1 > SCANDIR_PATH_LENGTH) {
amal_log_error("Filepath too long. Trying to append %s to %s", entry->d_name, dir_path);
return -1;
}
/* Replace '\0' with '/' */
dir_path[path_length] = '/';
++path_length;
am_memcpy(&dir_path[path_length], entry->d_name, filename_length);
path_length += filename_length;
dir_path[path_length] = '\0';
if(stat(dir_path, &file_stats) == -1) {
amal_log_perror("scan_dir_recursive_internal");
goto cleanup;
}
if(S_ISDIR(file_stats.st_mode)) {
cleanup_if_error(scan_dir_recursive_internal(dir_path, path_length, callback_func, userdata));
} else if(S_ISREG(file_stats.st_mode)) {
if(!callback_func(dir_path, path_length, userdata))
goto cleanup_noerr;
} else if(S_ISLNK(file_stats.st_mode)) {
amal_log_warning("Symlink ignored: %s", entry->d_name);
} else {
/* Ignore block devices and all other types of files */
}
}
cleanup_noerr:
closedir(dir);
return 0;
cleanup:
closedir(dir);
return -1;
}
int scan_dir_recursive(const char *dir_path, scan_dir_callback_func callback_func, void *userdata) {
char scandir_path[SCANDIR_PATH_LENGTH];
int dir_path_length = strlen(dir_path) + 1; /* include null terminator */
am_memcpy(scandir_path, dir_path, dir_path_length);
return scan_dir_recursive_internal(scandir_path, dir_path_length - 1, callback_func, userdata);
}
static int mapped_file_mode_to_system_file_mode(MappedFileMode file_mode) {
switch(file_mode) {
case MAPPED_FILE_READ: return PROT_READ;
case MAPPED_FILE_WRITE: return PROT_WRITE;
case MAPPED_FILE_READ_WRITE: return PROT_READ | PROT_WRITE;
default:
assert(bool_false);
return PROT_READ;
}
}
static int mapped_file_mode_to_open_mode(MappedFileMode file_mode) {
switch(file_mode) {
case MAPPED_FILE_READ: return O_RDONLY;
case MAPPED_FILE_WRITE: return O_WRONLY;
case MAPPED_FILE_READ_WRITE: return O_RDWR;
default:
assert(bool_false);
return O_RDONLY;
}
}
int mapped_file_init(MappedFile *self, const char *filepath, MappedFileMode file_mode) {
struct stat file_stats;
int fd;
const char *memblock;
int map_file_system_mode;
self->file_data = NULL;
self->file_size = 0;
self->fd = -1;
fd = open(filepath, mapped_file_mode_to_open_mode(file_mode));
if(fd == -1) return errno;
if(fstat(fd, &file_stats) == -1) {
amal_log_perror(filepath);
goto cleanup;
}
map_file_system_mode = mapped_file_mode_to_system_file_mode(file_mode);
memblock = mmap(NULL, file_stats.st_size, map_file_system_mode, MAP_SHARED, fd, 0);
if(memblock == MAP_FAILED) {
amal_log_perror(filepath);
goto cleanup;
}
self->file_data = memblock;
self->file_size = file_stats.st_size;
self->fd = fd;
return 0;
cleanup:
close(fd);
return -1;
}
int mapped_file_deinit(MappedFile *self) {
int result_munmap;
int result_close;
if(!self->file_data)
return 0;
result_munmap = munmap((void*)self->file_data, self->file_size);
if(result_munmap == -1)
amal_log_perror("mapped_file_deinit");
result_close = close(self->fd);
if(result_close == -1)
amal_log_perror("mapped_file_deinit");
self->file_data = NULL;
self->file_size = 0;
self->fd = 0;
if(result_munmap == -1 || result_close == -1)
return -1;
else
return 0;
}
int read_whole_file(const char *filepath, char **data, usize *size) {
FILE *file;
int result;
usize bytes_read;
result = 0;
file = fopen(filepath, "rb");
if(!file) {
int error;
error = errno;
amal_log_perror(filepath);
return error;
}
result = fseek(file, 0, SEEK_END);
if(result != 0) {
result = ferror(file);
goto cleanup;
}
*size = ftell(file);
result = fseek(file, 0, SEEK_SET);
if(result != 0) {
result = ferror(file);
goto cleanup;
}
cleanup_if_error(am_malloc(*size, (void**)data));
bytes_read = fread(*data, 1, *size, file);
if(bytes_read != *size) {
result = ferror(file);
}
cleanup:
fclose(file);
return result;
}
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