diff options
Diffstat (limited to 'v_windows/v/old/vlib/os/os_c.v')
| -rw-r--r-- | v_windows/v/old/vlib/os/os_c.v | 979 |
1 files changed, 979 insertions, 0 deletions
diff --git a/v_windows/v/old/vlib/os/os_c.v b/v_windows/v/old/vlib/os/os_c.v new file mode 100644 index 0000000..8275a9f --- /dev/null +++ b/v_windows/v/old/vlib/os/os_c.v @@ -0,0 +1,979 @@ +module os + +#include <sys/stat.h> // #include <signal.h> +#include <errno.h> + +struct C.dirent { + d_name [256]char +} + +fn C.readdir(voidptr) &C.dirent + +fn C.readlink(pathname &char, buf &char, bufsiz size_t) int + +fn C.getline(voidptr, voidptr, voidptr) int + +fn C.ftell(fp voidptr) i64 + +fn C.sigaction(int, voidptr, int) int + +fn C.open(&char, int, ...int) int + +fn C.fdopen(fd int, mode &char) &C.FILE + +fn C.ferror(stream &C.FILE) int + +fn C.feof(stream &C.FILE) int + +fn C.CopyFile(&u16, &u16, bool) int + +// fn C.lstat(charptr, voidptr) u64 + +fn C._wstat64(&u16, voidptr) u64 + +fn C.chown(&char, int, int) int + +fn C.ftruncate(voidptr, u64) int + +fn C._chsize_s(voidptr, u64) int + +// fn C.proc_pidpath(int, byteptr, int) int +struct C.stat { + st_size u64 + st_mode u32 + st_mtime int +} + +struct C.__stat64 { + st_size u64 + st_mode u32 + st_mtime int +} + +struct C.DIR { +} + +type FN_SA_Handler = fn (sig int) + +struct C.sigaction { +mut: + sa_mask int + sa_sigaction int + sa_flags int + sa_handler FN_SA_Handler +} + +struct C.dirent { + d_name &byte +} + +// read_bytes returns all bytes read from file in `path`. +[manualfree] +pub fn read_bytes(path string) ?[]byte { + mut fp := vfopen(path, 'rb') ? + defer { + C.fclose(fp) + } + cseek := C.fseek(fp, 0, C.SEEK_END) + if cseek != 0 { + return error('fseek failed') + } + fsize := C.ftell(fp) + if fsize < 0 { + return error('ftell failed') + } + C.rewind(fp) + mut res := []byte{len: int(fsize)} + nr_read_elements := int(C.fread(res.data, fsize, 1, fp)) + if nr_read_elements == 0 && fsize > 0 { + return error('fread failed') + } + res.trim(nr_read_elements * int(fsize)) + return res +} + +// read_file reads the file in `path` and returns the contents. +pub fn read_file(path string) ?string { + mode := 'rb' + mut fp := vfopen(path, mode) ? + defer { + C.fclose(fp) + } + cseek := C.fseek(fp, 0, C.SEEK_END) + if cseek != 0 { + return error('fseek failed') + } + fsize := C.ftell(fp) + if fsize < 0 { + return error('ftell failed') + } + // C.fseek(fp, 0, SEEK_SET) // same as `C.rewind(fp)` below + C.rewind(fp) + unsafe { + mut str := malloc_noscan(int(fsize) + 1) + nelements := int(C.fread(str, 1, fsize, fp)) + is_eof := int(C.feof(fp)) + is_error := int(C.ferror(fp)) + if is_eof == 0 && is_error != 0 { + free(str) + return error('fread failed') + } + str[nelements] = 0 + if nelements == 0 { + // It is highly likely that the file was a virtual file from + // /sys or /proc, with information generated on the fly, so + // fsize was not reliably reported. Using vstring() here is + // slower (it calls strlen internally), but will return more + // consistent results. + // For example reading from /sys/class/sound/card0/id produces + // a `PCH\n` string, but fsize is 4096, and otherwise you would + // get a V string with .len = 4096 and .str = "PCH\n\\000". + return str.vstring() + } + return str.vstring_with_len(nelements) + } +} + +// ***************************** OS ops ************************ +// +// truncate changes the size of the file located in `path` to `len`. +// Note that changing symbolic links on Windows only works as admin. +pub fn truncate(path string, len u64) ? { + fp := C.open(&char(path.str), o_wronly | o_trunc) + defer { + C.close(fp) + } + if fp < 0 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } + $if windows { + if C._chsize_s(fp, len) != 0 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } + } $else { + if C.ftruncate(fp, len) != 0 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } + } +} + +fn eprintln_unknown_file_size() { + eprintln('os.file_size() Cannot determine file-size: ' + posix_get_error_msg(C.errno)) +} + +// file_size returns the size of the file located in `path`. +// If an error occurs it returns 0. +// Note that use of this on symbolic links on Windows returns always 0. +pub fn file_size(path string) u64 { + mut s := C.stat{} + unsafe { + $if x64 { + $if windows { + mut swin := C.__stat64{} + if C._wstat64(path.to_wide(), voidptr(&swin)) != 0 { + eprintln_unknown_file_size() + return 0 + } + return swin.st_size + } $else { + if C.stat(&char(path.str), &s) != 0 { + eprintln_unknown_file_size() + return 0 + } + return u64(s.st_size) + } + } + $if x32 { + $if debug { + eprintln('Using os.file_size() on 32bit systems may not work on big files.') + } + $if windows { + if C._wstat(path.to_wide(), voidptr(&s)) != 0 { + eprintln_unknown_file_size() + return 0 + } + return u64(s.st_size) + } $else { + if C.stat(&char(path.str), &s) != 0 { + eprintln_unknown_file_size() + return 0 + } + return u64(s.st_size) + } + } + } + return 0 +} + +// mv moves files or folders from `src` to `dst`. +pub fn mv(src string, dst string) ? { + mut rdst := dst + if is_dir(rdst) { + rdst = join_path(rdst.trim_right(path_separator), file_name(src.trim_right(path_separator))) + } + $if windows { + w_src := src.replace('/', '\\') + w_dst := rdst.replace('/', '\\') + ret := C._wrename(w_src.to_wide(), w_dst.to_wide()) + if ret != 0 { + return error_with_code('failed to rename $src to $dst', int(ret)) + } + } $else { + ret := C.rename(&char(src.str), &char(rdst.str)) + if ret != 0 { + return error_with_code('failed to rename $src to $dst', int(ret)) + } + } +} + +// cp copies files or folders from `src` to `dst`. +pub fn cp(src string, dst string) ? { + $if windows { + w_src := src.replace('/', '\\') + w_dst := dst.replace('/', '\\') + if C.CopyFile(w_src.to_wide(), w_dst.to_wide(), false) == 0 { + result := C.GetLastError() + return error_with_code('failed to copy $src to $dst', int(result)) + } + } $else { + fp_from := C.open(&char(src.str), C.O_RDONLY) + if fp_from < 0 { // Check if file opened + return error_with_code('cp: failed to open $src', int(fp_from)) + } + fp_to := C.open(&char(dst.str), C.O_WRONLY | C.O_CREAT | C.O_TRUNC, C.S_IWUSR | C.S_IRUSR) + if fp_to < 0 { // Check if file opened (permissions problems ...) + C.close(fp_from) + return error_with_code('cp (permission): failed to write to $dst (fp_to: $fp_to)', + int(fp_to)) + } + // TODO use defer{} to close files in case of error or return. + // Currently there is a C-Error when building. + mut buf := [1024]byte{} + mut count := 0 + for { + count = C.read(fp_from, &buf[0], sizeof(buf)) + if count == 0 { + break + } + if C.write(fp_to, &buf[0], count) < 0 { + C.close(fp_to) + C.close(fp_from) + return error_with_code('cp: failed to write to $dst', int(-1)) + } + } + from_attr := C.stat{} + unsafe { + C.stat(&char(src.str), &from_attr) + } + if C.chmod(&char(dst.str), from_attr.st_mode) < 0 { + C.close(fp_to) + C.close(fp_from) + return error_with_code('failed to set permissions for $dst', int(-1)) + } + C.close(fp_to) + C.close(fp_from) + } +} + +// vfopen returns an opened C file, given its path and open mode. +// NB: os.vfopen is useful for compatibility with C libraries, that expect `FILE *`. +// If you write pure V code, os.create or os.open are more convenient. +pub fn vfopen(path string, mode string) ?&C.FILE { + if path.len == 0 { + return error('vfopen called with ""') + } + mut fp := voidptr(0) + $if windows { + fp = C._wfopen(path.to_wide(), mode.to_wide()) + } $else { + fp = C.fopen(&char(path.str), &char(mode.str)) + } + if isnil(fp) { + return error('failed to open file "$path"') + } else { + return fp + } +} + +// fileno returns the file descriptor of an opened C file. +pub fn fileno(cfile voidptr) int { + $if windows { + return C._fileno(cfile) + } $else { + mut cfile_casted := &C.FILE(0) // FILE* cfile_casted = 0; + cfile_casted = cfile + // Required on FreeBSD/OpenBSD/NetBSD as stdio.h defines fileno(..) with a macro + // that performs a field access on its argument without casting from void*. + return C.fileno(cfile_casted) + } +} + +// vpopen system starts the specified command, waits for it to complete, and returns its code. +fn vpopen(path string) voidptr { + // *C.FILE { + $if windows { + mode := 'rb' + wpath := path.to_wide() + return C._wpopen(wpath, mode.to_wide()) + } $else { + cpath := path.str + return C.popen(&char(cpath), c'r') + } +} + +fn posix_wait4_to_exit_status(waitret int) (int, bool) { + $if windows { + return waitret, false + } $else { + mut ret := 0 + mut is_signaled := true + // (see man system, man 2 waitpid: C macro WEXITSTATUS section) + if C.WIFEXITED(waitret) { + ret = C.WEXITSTATUS(waitret) + is_signaled = false + } else if C.WIFSIGNALED(waitret) { + ret = C.WTERMSIG(waitret) + is_signaled = true + } + return ret, is_signaled + } +} + +// posix_get_error_msg return error code representation in string. +pub fn posix_get_error_msg(code int) string { + ptr_text := C.strerror(code) // voidptr? + if ptr_text == 0 { + return '' + } + return unsafe { tos3(ptr_text) } +} + +// vpclose will close a file pointer opened with `vpopen`. +fn vpclose(f voidptr) int { + $if windows { + return C._pclose(f) + } $else { + ret, _ := posix_wait4_to_exit_status(C.pclose(f)) + return ret + } +} + +// system works like `exec`, but only returns a return code. +pub fn system(cmd string) int { + // if cmd.contains(';') || cmd.contains('&&') || cmd.contains('||') || cmd.contains('\n') { + // TODO remove panic + // panic(';, &&, || and \\n are not allowed in shell commands') + // } + mut ret := 0 + $if windows { + // overcome bug in system & _wsystem (cmd) when first char is quote `"` + wcmd := if cmd.len > 1 && cmd[0] == `"` && cmd[1] != `"` { '"$cmd"' } else { cmd } + unsafe { + ret = C._wsystem(wcmd.to_wide()) + } + } $else { + $if ios { + unsafe { + arg := [c'/bin/sh', c'-c', &byte(cmd.str), 0] + pid := 0 + ret = C.posix_spawn(&pid, c'/bin/sh', 0, 0, arg.data, 0) + status := 0 + ret = C.waitpid(pid, &status, 0) + if C.WIFEXITED(status) { + ret = C.WEXITSTATUS(status) + } + } + } $else { + unsafe { + ret = C.system(&char(cmd.str)) + } + } + } + if ret == -1 { + print_c_errno() + } + $if !windows { + pret, is_signaled := posix_wait4_to_exit_status(ret) + if is_signaled { + println('Terminated by signal ${ret:2d} (' + sigint_to_signal_name(pret) + ')') + } + ret = pret + } + return ret +} + +// exists returns true if `path` (file or directory) exists. +pub fn exists(path string) bool { + $if windows { + p := path.replace('/', '\\') + return C._waccess(p.to_wide(), f_ok) != -1 + } $else { + return C.access(&char(path.str), f_ok) != -1 + } +} + +// is_executable returns `true` if `path` is executable. +pub fn is_executable(path string) bool { + $if windows { + // NB: https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/access-waccess?view=vs-2019 + // i.e. there is no X bit there, the modes can be: + // 00 Existence only + // 02 Write-only + // 04 Read-only + // 06 Read and write + p := real_path(path) + return (exists(p) && p.ends_with('.exe')) + } + $if solaris { + statbuf := C.stat{} + unsafe { + if C.stat(&char(path.str), &statbuf) != 0 { + return false + } + } + return (int(statbuf.st_mode) & (s_ixusr | s_ixgrp | s_ixoth)) != 0 + } + return C.access(&char(path.str), x_ok) != -1 +} + +// is_writable returns `true` if `path` is writable. +pub fn is_writable(path string) bool { + $if windows { + p := path.replace('/', '\\') + return C._waccess(p.to_wide(), w_ok) != -1 + } $else { + return C.access(&char(path.str), w_ok) != -1 + } +} + +// is_readable returns `true` if `path` is readable. +pub fn is_readable(path string) bool { + $if windows { + p := path.replace('/', '\\') + return C._waccess(p.to_wide(), r_ok) != -1 + } $else { + return C.access(&char(path.str), r_ok) != -1 + } +} + +// rm removes file in `path`. +pub fn rm(path string) ? { + mut rc := 0 + $if windows { + rc = C._wremove(path.to_wide()) + } $else { + rc = C.remove(&char(path.str)) + } + if rc == -1 { + return error('Failed to remove "$path": ' + posix_get_error_msg(C.errno)) + } + // C.unlink(path.cstr()) +} + +// rmdir removes a specified directory. +pub fn rmdir(path string) ? { + $if windows { + rc := C.RemoveDirectory(path.to_wide()) + if rc == 0 { + // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-removedirectorya - 0 is failure + return error('Failed to remove "$path": ' + posix_get_error_msg(C.errno)) + } + } $else { + rc := C.rmdir(&char(path.str)) + if rc == -1 { + return error(posix_get_error_msg(C.errno)) + } + } +} + +// print_c_errno will print the current value of `C.errno`. +fn print_c_errno() { + e := C.errno + se := unsafe { tos_clone(&byte(C.strerror(e))) } + println('errno=$e err=$se') +} + +// get_raw_line returns a one-line string from stdin along with '\n' if there is any. +pub fn get_raw_line() string { + $if windows { + unsafe { + max_line_chars := 256 + buf := malloc_noscan(max_line_chars * 2) + h_input := C.GetStdHandle(C.STD_INPUT_HANDLE) + mut bytes_read := u32(0) + if is_atty(0) > 0 { + x := C.ReadConsole(h_input, buf, max_line_chars * 2, &bytes_read, 0) + if !x { + return tos(buf, 0) + } + return string_from_wide2(&u16(buf), int(bytes_read)) + } + mut offset := 0 + for { + pos := buf + offset + res := C.ReadFile(h_input, pos, 1, C.LPDWORD(&bytes_read), 0) + if !res && offset == 0 { + return tos(buf, 0) + } + if !res || bytes_read == 0 { + break + } + if *pos == `\n` || *pos == `\r` { + offset++ + break + } + offset++ + } + return buf.vstring_with_len(offset) + } + } $else { + max := size_t(0) + buf := &char(0) + nr_chars := unsafe { C.getline(&buf, &max, C.stdin) } + return unsafe { tos(&byte(buf), if nr_chars < 0 { 0 } else { nr_chars }) } + } +} + +// get_raw_stdin will get the raw input from stdin. +pub fn get_raw_stdin() []byte { + $if windows { + unsafe { + block_bytes := 512 + mut old_size := block_bytes + mut buf := malloc_noscan(block_bytes) + h_input := C.GetStdHandle(C.STD_INPUT_HANDLE) + mut bytes_read := 0 + mut offset := 0 + for { + pos := buf + offset + res := C.ReadFile(h_input, pos, block_bytes, C.LPDWORD(&bytes_read), 0) + offset += bytes_read + if !res { + break + } + new_size := offset + block_bytes + (block_bytes - bytes_read) + buf = realloc_data(buf, old_size, new_size) + old_size = new_size + } + return array{ + element_size: 1 + data: voidptr(buf) + len: offset + cap: offset + } + } + } $else { + max := size_t(0) + buf := &char(0) + nr_chars := unsafe { C.getline(&buf, &max, C.stdin) } + return array{ + element_size: 1 + data: voidptr(buf) + len: if nr_chars < 0 { 0 } else { nr_chars } + cap: int(max) + } + } +} + +// read_file_array reads an array of `T` values from file `path`. +pub fn read_file_array<T>(path string) []T { + a := T{} + tsize := int(sizeof(a)) + // prepare for reading, get current file size + mut fp := vfopen(path, 'rb') or { return []T{} } + C.fseek(fp, 0, C.SEEK_END) + fsize := C.ftell(fp) + C.rewind(fp) + // read the actual data from the file + len := fsize / tsize + buf := unsafe { malloc_noscan(int(fsize)) } + nread := C.fread(buf, tsize, len, fp) + C.fclose(fp) + return unsafe { + array{ + element_size: tsize + data: buf + len: int(nread) + cap: int(len) + } + } +} + +pub fn on_segfault(f voidptr) { + $if windows { + return + } + $if macos { + C.printf(c'TODO') + /* + mut sa := C.sigaction{} + C.memset(&sa, 0, sizeof(C.sigaction_size)) + C.sigemptyset(&sa.sa_mask) + sa.sa_sigaction = f + sa.sa_flags = C.SA_SIGINFO + C.sigaction(C.SIGSEGV, &sa, 0) + */ + } +} + +// executable returns the path name of the executable that started the current +// process. +[manualfree] +pub fn executable() string { + $if linux { + mut xresult := vcalloc_noscan(max_path_len) + count := C.readlink(c'/proc/self/exe', &char(xresult), max_path_len) + if count < 0 { + eprintln('os.executable() failed at reading /proc/self/exe to get exe path') + return executable_fallback() + } + return unsafe { xresult.vstring() } + } + $if windows { + max := 512 + size := max * 2 // max_path_len * sizeof(wchar_t) + mut result := unsafe { &u16(vcalloc_noscan(size)) } + len := C.GetModuleFileName(0, result, max) + // determine if the file is a windows symlink + attrs := C.GetFileAttributesW(result) + is_set := attrs & 0x400 // FILE_ATTRIBUTE_REPARSE_POINT + if is_set != 0 { // it's a windows symlink + // gets handle with GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 + file := C.CreateFile(result, 0x80000000, 1, 0, 3, 0x80, 0) + if file != voidptr(-1) { + final_path := unsafe { &u16(vcalloc_noscan(size)) } + // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew + final_len := C.GetFinalPathNameByHandleW(file, final_path, size, 0) + if final_len < size { + ret := unsafe { string_from_wide2(final_path, final_len) } + // remove '\\?\' from beginning (see link above) + return ret[4..] + } else { + eprintln('os.executable() saw that the executable file path was too long') + } + } + C.CloseHandle(file) + } + return unsafe { string_from_wide2(result, len) } + } + $if macos { + mut result := vcalloc_noscan(max_path_len) + pid := C.getpid() + ret := proc_pidpath(pid, result, max_path_len) + if ret <= 0 { + eprintln('os.executable() failed at calling proc_pidpath with pid: $pid . proc_pidpath returned $ret ') + return executable_fallback() + } + return unsafe { result.vstring() } + } + $if freebsd { + mut result := vcalloc_noscan(max_path_len) + mib := [1 /* CTL_KERN */, 14 /* KERN_PROC */, 12 /* KERN_PROC_PATHNAME */, -1] + size := max_path_len + unsafe { C.sysctl(mib.data, 4, result, &size, 0, 0) } + return unsafe { result.vstring() } + } + // "Sadly there is no way to get the full path of the executed file in OpenBSD." + $if openbsd { + } + $if solaris { + } + $if haiku { + } + $if netbsd { + mut result := vcalloc_noscan(max_path_len) + count := C.readlink(c'/proc/curproc/exe', &char(result), max_path_len) + if count < 0 { + eprintln('os.executable() failed at reading /proc/curproc/exe to get exe path') + return executable_fallback() + } + return unsafe { result.vstring_with_len(count) } + } + $if dragonfly { + mut result := vcalloc_noscan(max_path_len) + count := C.readlink(c'/proc/curproc/file', &char(result), max_path_len) + if count < 0 { + eprintln('os.executable() failed at reading /proc/curproc/file to get exe path') + return executable_fallback() + } + return unsafe { result.vstring_with_len(count) } + } + return executable_fallback() +} + +// is_dir returns a `bool` indicating whether the given `path` is a directory. +pub fn is_dir(path string) bool { + $if windows { + w_path := path.replace('/', '\\') + attr := C.GetFileAttributesW(w_path.to_wide()) + if attr == u32(C.INVALID_FILE_ATTRIBUTES) { + return false + } + if int(attr) & C.FILE_ATTRIBUTE_DIRECTORY != 0 { + return true + } + return false + } $else { + statbuf := C.stat{} + if unsafe { C.stat(&char(path.str), &statbuf) } != 0 { + return false + } + // ref: https://code.woboq.org/gcc/include/sys/stat.h.html + val := int(statbuf.st_mode) & s_ifmt + return val == s_ifdir + } +} + +// is_link returns a boolean indicating whether `path` is a link. +pub fn is_link(path string) bool { + $if windows { + path_ := path.replace('/', '\\') + attr := C.GetFileAttributesW(path_.to_wide()) + return int(attr) != int(C.INVALID_FILE_ATTRIBUTES) && (attr & 0x400) != 0 + } $else { + statbuf := C.stat{} + if C.lstat(&char(path.str), &statbuf) != 0 { + return false + } + return int(statbuf.st_mode) & s_ifmt == s_iflnk + } +} + +// chdir changes the current working directory to the new directory in `path`. +pub fn chdir(path string) { + $if windows { + C._wchdir(path.to_wide()) + } $else { + _ = C.chdir(&char(path.str)) + } +} + +// getwd returns the absolute path of the current directory. +pub fn getwd() string { + $if windows { + max := 512 // max_path_len * sizeof(wchar_t) + unsafe { + buf := &u16(vcalloc_noscan(max * 2)) + if C._wgetcwd(buf, max) == 0 { + free(buf) + return '' + } + return string_from_wide(buf) + } + } $else { + buf := vcalloc_noscan(max_path_len) + unsafe { + if C.getcwd(&char(buf), max_path_len) == 0 { + free(buf) + return '' + } + return buf.vstring() + } + } +} + +// real_path returns the full absolute path for fpath, with all relative ../../, symlinks and so on resolved. +// See http://pubs.opengroup.org/onlinepubs/9699919799/functions/realpath.html +// Also https://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html +// and https://insanecoding.blogspot.com/2007/11/implementing-realpath-in-c.html +// NB: this particular rabbit hole is *deep* ... +[manualfree] +pub fn real_path(fpath string) string { + mut res := '' + $if windows { + size := max_path_len * 2 + // gets handle with GENERIC_READ, FILE_SHARE_READ, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0 + // use C.CreateFile(fpath.to_wide(), 0x80000000, 1, 0, 3, 0x80, 0) instead of get_file_handle + // try to open the file to get symbolic link path + file := C.CreateFile(fpath.to_wide(), 0x80000000, 1, 0, 3, 0x80, 0) + if file != voidptr(-1) { + mut fullpath := unsafe { &u16(vcalloc_noscan(size)) } + // https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfinalpathnamebyhandlew + final_len := C.GetFinalPathNameByHandleW(file, fullpath, size, 0) + C.CloseHandle(file) + if final_len < size { + rt := unsafe { string_from_wide2(fullpath, final_len) } + res = rt[4..] + } else { + unsafe { free(fullpath) } + eprintln('os.real_path() saw that the file path was too long') + return fpath.clone() + } + } else { + // if it is not a file C.CreateFile doesn't gets a file handle, use GetFullPath instead + mut fullpath := unsafe { &u16(vcalloc_noscan(max_path_len * 2)) } + // TODO: check errors if path len is not enough + ret := C.GetFullPathName(fpath.to_wide(), max_path_len, fullpath, 0) + if ret == 0 { + unsafe { free(fullpath) } + return fpath.clone() + } + res = unsafe { string_from_wide(fullpath) } + } + } $else { + mut fullpath := vcalloc_noscan(max_path_len) + ret := &char(C.realpath(&char(fpath.str), &char(fullpath))) + if ret == 0 { + unsafe { free(fullpath) } + return fpath.clone() + } + res = unsafe { fullpath.vstring() } + } + unsafe { normalize_drive_letter(res) } + return res +} + +[direct_array_access; manualfree; unsafe] +fn normalize_drive_letter(path string) { + $if !windows { + return + } + // normalize_drive_letter is needed, because + // a path like c:\nv\.bin (note the small `c`) in %PATH, + // is NOT recognized by cmd.exe (and probably other programs too)... + // Capital drive letters do work fine. + if path.len > 2 && path[0] >= `a` && path[0] <= `z` && path[1] == `:` + && path[2] == path_separator[0] { + unsafe { + x := &path.str[0] + (*x) = *x - 32 + } + } +} + +// fork will fork the current system process and return the pid of the fork. +pub fn fork() int { + mut pid := -1 + $if !windows { + pid = C.fork() + } + $if windows { + panic('os.fork not supported in windows') // TODO + } + return pid +} + +// wait blocks the calling process until one of its child processes exits or a signal is received. +// After child process terminates, parent continues its execution after wait system call instruction. +pub fn wait() int { + mut pid := -1 + $if !windows { + pid = C.wait(0) + } + $if windows { + panic('os.wait not supported in windows') // TODO + } + return pid +} + +// file_last_mod_unix returns the "last modified" time stamp of file in `path`. +pub fn file_last_mod_unix(path string) int { + attr := C.stat{} + // # struct stat attr; + unsafe { C.stat(&char(path.str), &attr) } + // # stat(path.str, &attr); + return attr.st_mtime + // # return attr.st_mtime ; +} + +// flush will flush the stdout buffer. +pub fn flush() { + C.fflush(C.stdout) +} + +// chmod change file access attributes of `path` to `mode`. +// Octals like `0o600` can be used. +pub fn chmod(path string, mode int) { + if C.chmod(&char(path.str), mode) != 0 { + panic('chmod failed: ' + posix_get_error_msg(C.errno)) + } +} + +// chown changes the owner and group attributes of `path` to `owner` and `group`. +pub fn chown(path string, owner int, group int) ? { + $if windows { + return error('os.chown() not implemented for Windows') + } $else { + if C.chown(&char(path.str), owner, group) != 0 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } + } +} + +// open_append opens `path` file for appending. +pub fn open_append(path string) ?File { + mut file := File{} + $if windows { + wpath := path.replace('/', '\\').to_wide() + mode := 'ab' + file = File{ + cfile: C._wfopen(wpath, mode.to_wide()) + } + } $else { + cpath := path.str + file = File{ + cfile: C.fopen(&char(cpath), c'ab') + } + } + if isnil(file.cfile) { + return error('failed to create(append) file "$path"') + } + file.is_opened = true + return file +} + +// execvp - loads and executes a new child process, *in place* of the current process. +// The child process executable is located in `cmdpath`. +// The arguments, that will be passed to it are in `args`. +// NB: this function will NOT return when successfull, since +// the child process will take control over execution. +pub fn execvp(cmdpath string, args []string) ? { + mut cargs := []&char{} + cargs << &char(cmdpath.str) + for i in 0 .. args.len { + cargs << &char(args[i].str) + } + cargs << &char(0) + mut res := int(0) + $if windows { + res = C._execvp(&char(cmdpath.str), cargs.data) + } $else { + res = C.execvp(&char(cmdpath.str), cargs.data) + } + if res == -1 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } + // just in case C._execvp returned ... that happens on windows ... + exit(res) +} + +// execve - loads and executes a new child process, *in place* of the current process. +// The child process executable is located in `cmdpath`. +// The arguments, that will be passed to it are in `args`. +// You can pass environment variables to through `envs`. +// NB: this function will NOT return when successfull, since +// the child process will take control over execution. +pub fn execve(cmdpath string, args []string, envs []string) ? { + mut cargv := []&char{} + mut cenvs := []&char{} + cargv << &char(cmdpath.str) + for i in 0 .. args.len { + cargv << &char(args[i].str) + } + for i in 0 .. envs.len { + cenvs << &char(envs[i].str) + } + cargv << &char(0) + cenvs << &char(0) + mut res := int(0) + $if windows { + res = C._execve(&char(cmdpath.str), cargv.data, cenvs.data) + } $else { + res = C.execve(&char(cmdpath.str), cargv.data, cenvs.data) + } + // NB: normally execve does not return at all. + // If it returns, then something went wrong... + if res == -1 { + return error_with_code(posix_get_error_msg(C.errno), C.errno) + } +} |