4coder/platform_unix/unix_4ed_functions.cpp

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/*
* Mr. 4th Dimention - Allen Webster
*
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* 30.06.2017
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*
* General unix functions
*
*/
// TOP
#if !defined(FD_CHECK)
#define FD_CHECK()
#endif
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struct Unix_Vars{
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b32 did_first_log;
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};
global Unix_Vars unixvars;
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//
// 4ed Path
//
internal
Sys_Get_Current_Path_Sig(system_get_current_path){
i32 result = 0;
char *d = getcwd(out, capacity);
if (d == out){
result = strlen(out);
}
return(result);
}
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//
// Shared system functions (system_shared.h)
//
internal
Sys_File_Can_Be_Made_Sig(system_file_can_be_made){
b32 result = access((char*)filename, W_OK) == 0;
//LOGF("%s = %d\n", filename, result);
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return(result);
}
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//
// Memory
//
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internal void*
system_memory_allocate_extended(void *base, u64 size){
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// NOTE(allen): This must return the exact base of the vpage.
// We will count on the user to keep track of size themselves.
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void *result = mmap(base, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (result == MAP_FAILED){
result = 0;
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}
return(result);
}
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internal
Sys_Memory_Allocate_Sig(system_memory_allocate){
void *result = system_memory_allocate_extended(0, size);
return(result);
}
internal
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Sys_Memory_Set_Protection_Sig(system_memory_set_protection){
bool32 result = true;
int protect = 0;
switch (flags & 0x7){
case 0: protect = PROT_NONE; break;
case MemProtect_Read:
protect = PROT_READ; break;
case MemProtect_Write:
case MemProtect_Read|MemProtect_Write:
protect = PROT_READ | PROT_WRITE; break;
case MemProtect_Execute:
protect = PROT_EXEC; break;
case MemProtect_Execute|MemProtect_Read:
protect = PROT_READ | PROT_EXEC; break;
// NOTE(inso): some W^X protection things might be unhappy about this one
case MemProtect_Execute|MemProtect_Write:
case MemProtect_Execute|MemProtect_Write|MemProtect_Read:
protect = PROT_READ | PROT_WRITE | PROT_EXEC; break;
}
if(mprotect(ptr, size, protect) == -1){
result = 0;
}
return(result);
}
internal
Sys_Memory_Free_Sig(system_memory_free){
// NOTE(allen): This must take the exact base of the vpage.
munmap(ptr, size);
}
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//
// Files
//
internal
Sys_Set_File_List_Sig(system_set_file_list){
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if (directory == 0){
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system_memory_free(file_list->block, file_list->block_size);
file_list->block = 0;
file_list->block_size = 0;
file_list->infos = 0;
file_list->count = 0;
return;
}
//LOGF("%s\n", directory);
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DIR *d = opendir(directory);
if (d != 0){
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if (canon_directory_out != 0){
u32 length = copy_fast_unsafe_cc(canon_directory_out, directory);
if (canon_directory_out[length-1] != '/'){
canon_directory_out[length++] = '/';
}
canon_directory_out[length] = 0;
*canon_directory_size_out = length;
}
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i32 character_count = 0;
i32 file_count = 0;
for (struct dirent *entry = readdir(d);
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entry != 0;
entry = readdir(d)){
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char *fname = entry->d_name;
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if (match_cc(fname, ".") || match_cc(fname, "..")){
continue;
}
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++file_count;
i32 size = 0;
for (; fname[size]; ++size);
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character_count += size + 1;
}
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i32 required_size = character_count + file_count * sizeof(File_Info);
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if (file_list->block_size < required_size){
system_memory_free(file_list->block, file_list->block_size);
file_list->block = system_memory_allocate(required_size);
file_list->block_size = required_size;
}
file_list->infos = (File_Info*)file_list->block;
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char *cursor = (char*)(file_list->infos + file_count);
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if (file_list->block != 0){
rewinddir(d);
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File_Info *info_ptr = file_list->infos;
for (struct dirent *entry = readdir(d);
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entry != 0;
entry = readdir(d)){
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char *fname = entry->d_name;
if (match(fname, ".") || match(fname, "..")){
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continue;
}
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char *cursor_start = cursor;
i32 length = copy_fast_unsafe_cc(cursor_start, fname);
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cursor += length;
if (entry->d_type == DT_LNK){
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struct stat st;
if (stat(entry->d_name, &st) != -1){
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info_ptr->folder = S_ISDIR(st.st_mode);
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}
else{
info_ptr->folder = false;
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}
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}
else{
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info_ptr->folder = (entry->d_type == DT_DIR);
}
info_ptr->filename = cursor_start;
info_ptr->filename_len = length;
*cursor++ = 0;
++info_ptr;
}
}
file_list->count = file_count;
closedir(d);
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}
else{
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system_memory_free(file_list->block, file_list->block_size);
file_list->block = 0;
file_list->block_size = 0;
file_list->infos = 0;
file_list->count = 0;
}
}
internal
Sys_Get_Canonical_Sig(system_get_canonical){
char* path = (char*) alloca(len + 1);
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char* write_p = path;
const char* read_p = filename;
// return 0 for relative paths (e.g. cmdline args)
if(len > 0 && filename[0] != '/'){
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return 0;
}
if (max == 0){
return 0;
}
max -= 1;
while (read_p < filename + len){
if (read_p == filename || read_p[0] == '/'){
if (read_p[1] == '/'){
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++read_p;
}
else if(read_p[1] == '.'){
if (read_p[2] == '/' || !read_p[2]){
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read_p += 2;
} else if(read_p[2] == '.' && (read_p[3] == '/' || !read_p[3])){
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while(write_p > path && *--write_p != '/');
read_p += 3;
}
else {
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*write_p++ = *read_p++;
}
}
else{
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*write_p++ = *read_p++;
}
}
else{
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*write_p++ = *read_p++;
}
}
if (write_p == path) *write_p++ = '/';
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if (max >= (write_p - path)){
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memcpy(buffer, path, write_p - path);
}
else{
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write_p = path;
}
#if defined(FRED_INTERNAL)
if (len != (write_p - path) || memcmp(filename, path, len) != 0){
//LOGF("[%.*s] -> [%.*s]\n", len, filename, (int)(write_p - path), path);
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}
#endif
u32 length = (i32)(write_p - path);
buffer[length] = 0;
return(length);
}
internal
Sys_Load_Handle_Sig(system_load_handle){
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b32 result = false;
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FD_CHECK();
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i32 fd = open(filename, O_RDONLY);
if (fd == -1 || fd == 0){
//LOGF("upable to open file descriptor for %s\n", filename);
}
else{
//LOGF("file descriptor (%d) == file %s\n", fd, filename);
*(i32*)handle_out = fd;
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result = true;
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}
return(result);
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}
internal
Sys_Load_Size_Sig(system_load_size){
u32 result = 0;
i32 fd = *(i32*)&handle;
struct stat st = {};
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if (fstat(fd, &st) == -1){
//LOGF("unable to stat a file\n");
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}
else{
//LOGF("file descriptor (%d) has size %d\n", fd, (i32)st.st_size);
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result = st.st_size;
}
return(result);
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}
internal
Sys_Load_File_Sig(system_load_file){
i32 fd = *(i32*)&handle;
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do{
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ssize_t n = read(fd, buffer, size);
if (n == -1){
if (errno != EINTR){
//LOGF("error reading from file descriptor (%d)\n", fd);
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break;
}
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}
else{
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size -= n;
buffer += n;
}
} while(size);
return(size == 0);
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}
internal
Sys_Load_Close_Sig(system_load_close){
b32 result = true;
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i32 fd = *(i32*)&handle;
if (close(fd) == -1){
//LOGF("error closing file descriptor (%d)\n", fd);
result = false;
}
else{
//LOGF("file descriptor (%d) closed\n", fd);
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}
FD_CHECK();
return(result);
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}
internal
Sys_Save_File_Sig(system_save_file){
i32 fd = open(filename, O_WRONLY|O_TRUNC|O_CREAT, 00640);
//LOGF("%s %d\n", filename, size);
if (fd < 0){
//LOGF("error: open '%s': %s\n", filename, strerror(errno));
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}
else{
do{
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ssize_t written = write(fd, buffer, size);
if (written == -1){
if (errno != EINTR){
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break;
}
}
else{
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size -= written;
buffer += written;
}
}while(size);
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close(fd);
}
return(size == 0);
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}
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//
// File System
//
internal
Sys_File_Exists_Sig(system_file_exists){
int result = 0;
char buff[PATH_MAX] = {};
if (len + 1 > PATH_MAX){
//LOG("system_directory_has_file: path too long\n");
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}
else{
memcpy(buff, filename, len);
buff[len] = 0;
struct stat st;
result = stat(buff, &st) == 0 && S_ISREG(st.st_mode);
}
//LOGF("%s: %d\n", buff, result);
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return(result);
}
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// BOTTOM