mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-07-26 04:20:30 +00:00
Further improve cocmd interpreter
This commit is contained in:
Justine Tunney
parent
0cee831da3
commit
0f89140882
14 changed files with 278 additions and 181 deletions
664
libc/runtime/cocmd.c
Normal file
664
libc/runtime/cocmd.c
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@ -0,0 +1,664 @@
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/fmt/conv.h"
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#include "libc/fmt/itoa.h"
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#include "libc/fmt/magnumstrs.internal.h"
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#include "libc/intrin/bits.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/sysv/consts/timer.h"
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/**
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* @fileoverview Cosmopolitan Command Interpreter
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*
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* This is a lightweight command interpreter for GNU Make. It has just
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* enough shell script language support to support our build config.
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*/
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#define STATE_CMD 0
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#define STATE_VAR 1
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#define STATE_SINGLE 2
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#define STATE_QUOTED 3
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#define STATE_QUOTED_VAR 4
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#define STATE_WHITESPACE 5
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#define READ24LE(s) READ32LE(s "\0")
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struct Env {
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char *s;
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int i;
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};
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static char *p;
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static char *q;
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static char *r;
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static int envi;
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static int vari;
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static size_t n;
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static char *cmd;
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static char var[32];
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static int lastchild;
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static int exitstatus;
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static char *envs[3000];
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static char *args[3000];
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static const char *prog;
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static char errbuf[512];
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static char argbuf[ARG_MAX];
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static bool unsupported[256];
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static ssize_t Write(int fd, const char *s) {
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return write(fd, s, strlen(s));
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}
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static void Log(const char *s, ...) {
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va_list va;
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va_start(va, s);
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errbuf[0] = 0;
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do {
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strlcat(errbuf, s, sizeof(argbuf));
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} while ((s = va_arg(va, const char *)));
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strlcat(errbuf, "\n", sizeof(argbuf));
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Write(2, errbuf);
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va_end(va);
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}
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static wontreturn void Wexit(int rc, const char *s, ...) {
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va_list va;
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va_start(va, s);
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errbuf[0] = 0;
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do {
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strlcat(errbuf, s, sizeof(argbuf));
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} while ((s = va_arg(va, const char *)));
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Write(2, errbuf);
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va_end(va);
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_Exit(rc);
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}
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static wontreturn void UnsupportedSyntax(unsigned char c) {
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char ibuf[13], cbuf[2] = {c};
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FormatOctal32(ibuf, c, true);
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Wexit(4, prog, ": unsupported syntax '", cbuf, "' (", ibuf, "): ", cmd, "\n",
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0);
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}
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static wontreturn void SysExit(int rc, const char *call, const char *thing) {
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int err;
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char ibuf[12];
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const char *estr;
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err = errno;
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FormatInt32(ibuf, err);
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estr = _strerdoc(err);
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if (!estr) estr = "EUNKNOWN";
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Wexit(rc, thing, ": ", call, "() failed: ", estr, " (", ibuf, ")\n", 0);
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}
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static void Open(const char *path, int fd, int flags) {
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const char *err;
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close(fd);
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if (open(path, flags, 0644) == -1) {
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SysExit(7, "open", path);
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}
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}
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static wontreturn void Exec(void) {
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_unassert(args[0][0]);
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if (!n) Wexit(5, prog, ": error: too few args\n", 0);
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execvpe(args[0], args, envs);
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SysExit(127, "execve", args[0]);
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}
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static int GetSignalByName(const char *s) {
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for (int i = 0; kSignalNames[i].x != MAGNUM_TERMINATOR; ++i) {
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if (!strcmp(s, MAGNUM_STRING(kSignalNames, i) + 3)) {
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return MAGNUM_NUMBER(kSignalNames, i);
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}
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}
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return 0;
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}
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static struct Env GetEnv(char **p, const char *k) {
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int i, j;
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for (i = 0; p[i]; ++i) {
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for (j = 0;; ++j) {
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if (!k[j] || k[j] == '=') {
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if (p[i][j] == '=') {
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return (struct Env){p[i] + j + 1, i};
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}
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break;
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}
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if (toupper(k[j] & 255) != toupper(p[i][j] & 255)) {
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break;
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}
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}
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}
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return (struct Env){0, i};
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}
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static void PutEnv(char **p, const char *kv) {
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struct Env e;
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e = GetEnv(p, kv);
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p[e.i] = kv;
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if (!e.s) p[e.i + 1] = 0;
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}
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static void Append(int c) {
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_npassert(q + 1 < argbuf + sizeof(argbuf));
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*q++ = c;
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}
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static char *Finish(void) {
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char *s = r;
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Append(0);
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return r = q, s;
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}
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static int True(void) {
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return 0;
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}
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static int False(void) {
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return 1;
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}
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static wontreturn void Exit(void) {
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_Exit(n > 1 ? atoi(args[1]) : 0);
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}
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static int Wait(void) {
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char ibuf[12];
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int e, rc, ws, pid;
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if (n > 1) {
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if (waitpid(atoi(args[1]), &ws, 0) == -1) {
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SysExit(22, "waitpid", prog);
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}
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rc = WIFEXITED(ws) ? WEXITSTATUS(ws) : 128 + WTERMSIG(ws);
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exitstatus = rc;
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} else {
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for (e = errno;;) {
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if (waitpid(-1, &ws, 0) == -1) {
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if (errno == ECHILD) {
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errno = e;
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break;
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}
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SysExit(22, "waitpid", prog);
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}
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}
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rc = 0;
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}
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return rc;
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}
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static int Echo(void) {
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int i = 1;
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bool once = false;
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const char *l = " ";
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if (i < n && !strcmp(args[i], "-l")) {
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++i, l = "\n";
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}
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for (; i < n; ++i) {
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if (once) {
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Write(1, l);
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} else {
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once = true;
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}
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Write(1, args[i]);
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}
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Write(1, "\n");
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return 0;
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}
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static int Read(void) {
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unsigned char c;
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int i, j, rc = 1;
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for (i = 1; i < n; ++i) {
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if (args[i][0] != '-') break;
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if (args[i][1] == 'p' && !args[i][2] && i + 1 < n) {
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Write(1, args[++i]);
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}
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}
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if (i >= n) return 1;
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for (j = 0; args[i][j]; ++j) {
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Append(args[i][j]);
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}
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Append('=');
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while (read(0, &c, 1) > 0) {
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if (c == '\n') break;
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Append(c);
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rc = 0;
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}
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PutEnv(envs, Finish());
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return rc;
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}
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static int Cd(void) {
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const char *s;
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if ((s = n > 1 ? args[1] : GetEnv(envs, "HOME").s)) {
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if (!chdir(s)) {
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return 0;
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} else {
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Log("chdir: ", s, ": ", _strerdoc(errno), 0);
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return 1;
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}
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} else {
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Log("chdir: missing argument", 0);
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return 1;
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}
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}
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static int Mkdir(void) {
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int i = 1;
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int (*f)(const char *, unsigned) = mkdir;
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if (n >= 3 && !strcmp(args[1], "-p")) ++i, f = makedirs;
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for (; i < n; ++i) {
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if (f(args[i], 0755)) {
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Log("mkdir: ", args[i], ": ", _strerdoc(errno), 0);
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return errno;
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}
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}
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return 0;
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}
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static int Kill(void) {
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int sig, rc = 0, i = 1;
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if (i < n && args[i][0] == '-') {
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sig = GetSignalByName(args[i++] + 1);
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if (!sig) return 1;
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} else {
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sig = SIGTERM;
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}
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for (; i < n; ++i) {
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if (kill(atoi(args[i]), sig)) {
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Log("kill: ", args[i], ": ", _strerdoc(errno), 0);
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rc = 1;
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}
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}
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return rc;
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}
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static int Toupper(void) {
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int i, n;
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char b[512];
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while ((n = read(0, b, 512)) > 0) {
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for (i = 0; i < n; ++i) {
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b[i] = toupper(b[i]);
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}
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write(1, b, n);
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}
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return 0;
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}
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static int Usleep(void) {
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int f;
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struct timespec t;
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if (n > 1) {
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f = 0;
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t = _timespec_frommicros(atoi(args[1]));
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} else {
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f = TIMER_ABSTIME;
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t = _timespec_max;
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}
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return clock_nanosleep(0, f, &t, 0);
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}
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static int Test(void) {
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int w;
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struct stat st;
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if (n && READ16LE(args[n - 1]) == READ16LE("]")) --n;
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if (n == 4) {
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w = READ32LE(args[2]) & 0x00ffffff;
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if ((w & 65535) == READ16LE("=")) return !!strcmp(args[1], args[3]);
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if (w == READ24LE("==")) return !!strcmp(args[1], args[3]);
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if (w == READ24LE("!=")) return !strcmp(args[1], args[3]);
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} else if (n == 3) {
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w = READ32LE(args[1]) & 0x00ffffff;
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if (w == READ24LE("-n")) return !(strlen(args[2]) > 0);
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if (w == READ24LE("-z")) return !(strlen(args[2]) == 0);
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if (w == READ24LE("-e")) return !!stat(args[2], &st);
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if (w == READ24LE("-f")) return !stat(args[2], &st) && S_ISREG(st.st_mode);
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if (w == READ24LE("-d")) return !stat(args[2], &st) && S_ISDIR(st.st_mode);
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if (w == READ24LE("-h")) return !stat(args[2], &st) && S_ISLNK(st.st_mode);
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}
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return 1;
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}
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static int TryBuiltin(void) {
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if (!n) return 0;
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if (!strcmp(args[0], "exit")) Exit();
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if (!strcmp(args[0], "cd")) return Cd();
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if (!strcmp(args[0], "[")) return Test();
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if (!strcmp(args[0], "wait")) return Wait();
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if (!strcmp(args[0], "echo")) return Echo();
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if (!strcmp(args[0], "read")) return Read();
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if (!strcmp(args[0], "true")) return True();
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if (!strcmp(args[0], "test")) return Test();
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if (!strcmp(args[0], "kill")) return Kill();
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if (!strcmp(args[0], "mkdir")) return Mkdir();
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if (!strcmp(args[0], "false")) return False();
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if (!strcmp(args[0], "usleep")) return Usleep();
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if (!strcmp(args[0], "toupper")) return Toupper();
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return -1;
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}
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static wontreturn void Launch(void) {
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int rc;
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if ((rc = TryBuiltin()) != -1) _Exit(rc);
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Exec();
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}
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static void Pipe(void) {
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int pid, pfds[2];
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if (pipe2(pfds, O_CLOEXEC)) SysExit(8, "pipe2", prog);
|
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if ((pid = fork()) == -1) SysExit(9, "vfork", prog);
|
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if (!pid) {
|
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_unassert(dup2(pfds[1], 1) == 1);
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// we can't rely on cloexec because builtins
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if (pfds[0] != 1) _unassert(!close(pfds[0]));
|
||||
if (pfds[1] != 1) _unassert(!close(pfds[1]));
|
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Launch();
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}
|
||||
_unassert(!dup2(pfds[0], 0));
|
||||
if (pfds[1]) _unassert(!close(pfds[1]));
|
||||
n = 0;
|
||||
}
|
||||
|
||||
static int Run(void) {
|
||||
int exitstatus, ws, pid;
|
||||
if ((exitstatus = TryBuiltin()) == -1) {
|
||||
if ((pid = vfork()) == -1) SysExit(21, "vfork", prog);
|
||||
if (!pid) Exec();
|
||||
if (waitpid(pid, &ws, 0) == -1) SysExit(22, "waitpid", prog);
|
||||
exitstatus = WIFEXITED(ws) ? WEXITSTATUS(ws) : 128 + WTERMSIG(ws);
|
||||
}
|
||||
n = 0;
|
||||
return exitstatus;
|
||||
}
|
||||
|
||||
static void Async(void) {
|
||||
if ((lastchild = fork()) == -1) SysExit(21, "vfork", prog);
|
||||
if (!lastchild) Launch();
|
||||
n = 0;
|
||||
}
|
||||
|
||||
static const char *IntToStr(int x) {
|
||||
static char ibuf[12];
|
||||
FormatInt32(ibuf, x);
|
||||
return ibuf;
|
||||
}
|
||||
|
||||
static const char *GetVar(const char *key) {
|
||||
if (key[0] == '$' && !key[1]) {
|
||||
return IntToStr(getpid());
|
||||
} else if (key[0] == '!' && !key[1]) {
|
||||
return IntToStr(lastchild);
|
||||
} else if (key[0] == '?' && !key[1]) {
|
||||
return IntToStr(exitstatus);
|
||||
} else {
|
||||
return GetEnv(envs, key).s;
|
||||
}
|
||||
}
|
||||
|
||||
static bool IsVarName(int c) {
|
||||
return isalnum(c) || c == '_' ||
|
||||
(!vari && (c == '?' || c == '!' || c == '$'));
|
||||
}
|
||||
|
||||
static bool CopyVar(void) {
|
||||
size_t j;
|
||||
const char *s;
|
||||
if (IsVarName(*p)) {
|
||||
_npassert(vari + 1 < sizeof(var));
|
||||
var[vari++] = *p;
|
||||
var[vari] = 0;
|
||||
return false;
|
||||
}
|
||||
if ((s = GetVar(var))) {
|
||||
if ((j = strlen(s))) {
|
||||
_npassert(q + j < argbuf + sizeof(argbuf));
|
||||
q = mempcpy(q, s, j);
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static char *Tokenize(void) {
|
||||
const char *s;
|
||||
int c, t, j, k, rc;
|
||||
for (t = STATE_WHITESPACE;; ++p) {
|
||||
switch (t) {
|
||||
|
||||
case STATE_WHITESPACE:
|
||||
if (!*p) return 0;
|
||||
if (*p == ' ' || *p == '\t' || *p == '\n' ||
|
||||
(p[0] == '\\' && p[1] == '\n')) {
|
||||
continue;
|
||||
}
|
||||
t = STATE_CMD;
|
||||
// fallthrough
|
||||
|
||||
case STATE_CMD:
|
||||
if (unsupported[*p & 255]) {
|
||||
UnsupportedSyntax(*p);
|
||||
}
|
||||
if (!*p || *p == ' ' || *p == '\t') {
|
||||
return Finish();
|
||||
} else if (*p == '"') {
|
||||
t = STATE_QUOTED;
|
||||
} else if (*p == '\'') {
|
||||
t = STATE_SINGLE;
|
||||
} else if (*p == '$') {
|
||||
t = STATE_VAR;
|
||||
var[(vari = 0)] = 0;
|
||||
} else if (*p == '\\') {
|
||||
if (!p[1]) UnsupportedSyntax(*p);
|
||||
Append(*++p);
|
||||
} else if (*p == '|') {
|
||||
if (q > r) {
|
||||
return Finish();
|
||||
} else if (p[1] == '|') {
|
||||
rc = Run();
|
||||
if (!rc) {
|
||||
_Exit(0);
|
||||
} else {
|
||||
++p;
|
||||
t = STATE_WHITESPACE;
|
||||
}
|
||||
} else {
|
||||
Pipe();
|
||||
t = STATE_WHITESPACE;
|
||||
}
|
||||
} else if (*p == ';') {
|
||||
if (q > r) {
|
||||
return Finish();
|
||||
} else {
|
||||
Run();
|
||||
t = STATE_WHITESPACE;
|
||||
}
|
||||
} else if (*p == '&') {
|
||||
if (q > r) {
|
||||
return Finish();
|
||||
} else if (p[1] == '&') {
|
||||
rc = Run();
|
||||
if (!rc) {
|
||||
++p;
|
||||
t = STATE_WHITESPACE;
|
||||
} else {
|
||||
_Exit(rc);
|
||||
}
|
||||
} else {
|
||||
Async();
|
||||
t = STATE_WHITESPACE;
|
||||
}
|
||||
} else {
|
||||
Append(*p);
|
||||
}
|
||||
break;
|
||||
|
||||
case STATE_VAR:
|
||||
// XXX: we need to find a simple elegant way to break up
|
||||
// unquoted variable expansions into multiple args.
|
||||
if (CopyVar()) t = STATE_CMD, --p;
|
||||
break;
|
||||
|
||||
case STATE_SINGLE:
|
||||
if (!*p) goto UnterminatedString;
|
||||
if (*p == '\'') {
|
||||
t = STATE_CMD;
|
||||
} else {
|
||||
*q++ = *p;
|
||||
}
|
||||
break;
|
||||
|
||||
UnterminatedString:
|
||||
Wexit(6, "cmd: error: unterminated string\n", 0);
|
||||
|
||||
case STATE_QUOTED_VAR:
|
||||
if (!*p) goto UnterminatedString;
|
||||
if (CopyVar()) t = STATE_QUOTED, --p;
|
||||
break;
|
||||
|
||||
case STATE_QUOTED:
|
||||
if (!*p) goto UnterminatedString;
|
||||
if (*p == '"') {
|
||||
t = STATE_CMD;
|
||||
} else if (p[0] == '$') {
|
||||
t = STATE_QUOTED_VAR;
|
||||
var[(vari = 0)] = 0;
|
||||
} else if (p[0] == '\\') {
|
||||
switch ((c = *++p)) {
|
||||
case 0:
|
||||
UnsupportedSyntax('\\');
|
||||
case '\n':
|
||||
break;
|
||||
case '$':
|
||||
case '`':
|
||||
case '"':
|
||||
*q++ = c;
|
||||
break;
|
||||
default:
|
||||
*q++ = '\\';
|
||||
*q++ = c;
|
||||
break;
|
||||
}
|
||||
} else {
|
||||
*q++ = *p;
|
||||
}
|
||||
break;
|
||||
|
||||
default:
|
||||
unreachable;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static const char *GetRedirectArg(const char *prog, const char *arg, int n) {
|
||||
if (arg[n]) {
|
||||
return arg + n;
|
||||
} else if ((arg = Tokenize())) {
|
||||
return arg;
|
||||
} else {
|
||||
Wexit(14, prog, ": error: redirect missing path\n", 0);
|
||||
}
|
||||
}
|
||||
|
||||
int _cocmd(int argc, char **argv, char **envp) {
|
||||
char *arg;
|
||||
size_t i, j;
|
||||
prog = argc > 0 ? argv[0] : "cocmd.com";
|
||||
|
||||
for (i = 1; i < 32; ++i) {
|
||||
unsupported[i] = true;
|
||||
}
|
||||
unsupported['\t'] = false;
|
||||
unsupported[0177] = true;
|
||||
unsupported['~'] = true;
|
||||
unsupported['`'] = true;
|
||||
unsupported['#'] = true;
|
||||
unsupported['*'] = true;
|
||||
unsupported['('] = true;
|
||||
unsupported[')'] = true;
|
||||
unsupported['{'] = true;
|
||||
unsupported['}'] = true;
|
||||
unsupported['?'] = true;
|
||||
|
||||
if (argc != 3) {
|
||||
Wexit(10, prog, ": error: wrong number of args\n", 0);
|
||||
}
|
||||
|
||||
if (strcmp(argv[1], "-c")) {
|
||||
Wexit(11, prog, ": error: argv[1] should -c\n", 0);
|
||||
}
|
||||
|
||||
p = cmd = argv[2];
|
||||
if (strlen(cmd) >= ARG_MAX) {
|
||||
Wexit(12, prog, ": error: cmd too long: ", cmd, "\n", 0);
|
||||
}
|
||||
|
||||
// copy environment variables
|
||||
envi = 0;
|
||||
if (envp) {
|
||||
for (; envp[envi]; ++envi) {
|
||||
_npassert(envi + 1 < ARRAYLEN(envs));
|
||||
envs[envi] = envp[envi];
|
||||
}
|
||||
}
|
||||
envs[envi] = 0;
|
||||
|
||||
// get command line arguments
|
||||
n = 0;
|
||||
r = q = argbuf;
|
||||
while ((arg = Tokenize())) {
|
||||
if (n + 1 < ARRAYLEN(args)) {
|
||||
if (isdigit(arg[0]) && arg[1] == '>' && arg[2] == '&' &&
|
||||
isdigit(arg[3])) {
|
||||
dup2(arg[3] - '0', arg[0] - '0');
|
||||
} else if (arg[0] == '>' && arg[1] == '&' && isdigit(arg[2])) {
|
||||
dup2(arg[2] - '0', 1);
|
||||
} else if (isdigit(arg[0]) && arg[1] == '>' && arg[2] == '>') {
|
||||
Open(GetRedirectArg(prog, arg, 3), arg[0] - '0',
|
||||
O_WRONLY | O_CREAT | O_APPEND);
|
||||
} else if (arg[0] == '>' && arg[1] == '>') {
|
||||
Open(GetRedirectArg(prog, arg, 2), 1, O_WRONLY | O_CREAT | O_APPEND);
|
||||
} else if (isdigit(arg[0]) && arg[1] == '>') {
|
||||
Open(GetRedirectArg(prog, arg, 2), arg[0] - '0',
|
||||
O_WRONLY | O_CREAT | O_TRUNC);
|
||||
} else if (arg[0] == '>') {
|
||||
Open(GetRedirectArg(prog, arg, 1), 1, O_WRONLY | O_CREAT | O_TRUNC);
|
||||
} else if (arg[0] == '<') {
|
||||
Open(GetRedirectArg(prog, arg, 1), 0, O_RDONLY);
|
||||
} else {
|
||||
args[n++] = arg;
|
||||
args[n] = 0;
|
||||
}
|
||||
} else {
|
||||
Wexit(13, prog, ": error: too many args\n", 0);
|
||||
}
|
||||
}
|
||||
|
||||
Launch();
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue