GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/initramdisk/toybox/toybox-0.8.8.patch/main.c

@@ -0,0 +1,301 @@
+/* Toybox infrastructure.
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ */
+
+#include "toys.h"
+
+// Populate toy_list[].
+
+#undef NEWTOY
+#undef OLDTOY
+#define NEWTOY(name, opts, flags) {#name, name##_main, OPTSTR_##name, flags},
+#define OLDTOY(name, oldname, flags) \
+  {#name, oldname##_main, OPTSTR_##oldname, flags},
+
+struct toy_list toy_list[] = {
+#include "generated/newtoys.h"
+};
+
+// global context for this command.
+
+struct toy_context toys;
+union global_union this;
+char *toybox_version = TOYBOX_VERSION, toybuf[4096], libbuf[4096];
+
+struct toy_list *toy_find(char *name)
+{
+  int top, bottom, middle;
+
+  if (!CFG_TOYBOX || strchr(name, '/')) return 0;
+
+  // Multiplexer name works as prefix, else skip first entry (it's out of order)
+  if (!toys.which && strstart(&name, toy_list->name)) return toy_list;
+  bottom = 1;
+
+  // Binary search to find this command.
+  top = ARRAY_LEN(toy_list)-1;
+  for (;;) {
+    int result;
+
+    middle = (top+bottom)/2;
+    if (middle<bottom || middle>top) return 0;
+    result = strcmp(name,toy_list[middle].name);
+    if (!result) return toy_list+middle;
+    if (result<0) top = --middle;
+    else bottom = ++middle;
+  }
+}
+
+// Figure out whether or not anything is using the option parsing logic,
+// because the compiler can't figure out whether or not to optimize it away
+// on its' own.  NEED_OPTIONS becomes a constant allowing if() to optimize
+// stuff out via dead code elimination.
+
+#undef NEWTOY
+#undef OLDTOY
+#define NEWTOY(name, opts, flags) opts ||
+#define OLDTOY(name, oldname, flags) OPTSTR_##oldname ||
+static const int NEED_OPTIONS =
+#include "generated/newtoys.h"
+0;  // Ends the opts || opts || opts...
+
+// Populate help text array
+
+#undef NEWTOY
+#undef OLDTOY
+#define NEWTOY(name,opt,flags) HELP_##name "\0"
+#if CFG_TOYBOX
+#define OLDTOY(name,oldname,flags) "\xff" #oldname "\0"
+#else
+#define OLDTOY(name, oldname, flags) HELP_##oldname "\0"
+#endif
+
+#include "generated/help.h"
+static char *help_data =
+#include "generated/newtoys.h"
+;
+
+void show_help(FILE *out, int full)
+{
+  int i = toys.which-toy_list;
+  char *s, *ss;
+
+  if (!(full&2))
+    fprintf(out, "Toybox %s"USE_TOYBOX(" multicall binary")"%s\n\n",
+      toybox_version, (CFG_TOYBOX && i) ? " (see toybox --help)"
+      : " (see https://landley.net/toybox)");
+
+  if (CFG_TOYBOX_HELP) {
+    for (;;) {
+      s = help_data;
+      while (i--) s += strlen(s) + 1;
+      // If it's an alias, restart search for real name
+      if (*s != 255) break;
+      i = toy_find(++s)-toy_list;
+    }
+
+    if (full) fprintf(out, "%s\n", s);
+    else {
+      strstart(&s, "usage: ");
+      for (ss = s; *ss && *ss!='\n'; ss++);
+      fprintf(out, "%.*s\n", (int)(ss-s), s);
+    }
+  }
+}
+
+static void unknown(char *name)
+{
+  toys.exitval = 127;
+  toys.which = toy_list;
+  help_exit("Unknown command %s", name);
+}
+
+// Parse --help and --version for (almost) all commands
+void check_help(char **arg)
+{
+  if (!CFG_TOYBOX_HELP_DASHDASH || !*arg) return;
+  if (!CFG_TOYBOX || toys.which != toy_list)
+    if (toys.which->flags&TOYFLAG_NOHELP) return;
+
+  if (!strcmp(*arg, "--help")) {
+    if (CFG_TOYBOX && toys.which == toy_list && arg[1])
+      if (!(toys.which = toy_find(arg[1]))) unknown(arg[1]);
+    show_help(stdout, 1);
+    xexit();
+  }
+
+  if (!strcmp(*arg, "--version")) {
+    xprintf("toybox %s\n", toybox_version);
+    xexit();
+  }
+}
+
+// Setup toybox global state for this command.
+void toy_singleinit(struct toy_list *which, char *argv[])
+{
+  toys.which = which;
+  toys.argv = argv;
+  toys.toycount = ARRAY_LEN(toy_list);
+
+  if (NEED_OPTIONS && which->options) get_optflags();
+  else {
+    check_help(toys.optargs = argv+1);
+    for (toys.optc = 0; toys.optargs[toys.optc]; toys.optc++);
+  }
+
+  if (!(CFG_TOYBOX && which == toy_list) && !(which->flags & TOYFLAG_NOFORK)) {
+    toys.old_umask = umask(0);
+    if (!(which->flags & TOYFLAG_UMASK)) umask(toys.old_umask);
+
+    // Try user's locale, but merge in the en_US.UTF-8 locale's character
+    // type data if the user's locale isn't UTF-8. (We can't merge in C.UTF-8
+    // because that locale doesn't exist on macOS.)
+//    setlocale(LC_CTYPE, "");
+//    if (strcmp("UTF-8", nl_langinfo(CODESET)))
+//      uselocale(newlocale(LC_CTYPE_MASK, "en_US.UTF-8", NULL));
+
+    setvbuf(stdout, 0, (which->flags & TOYFLAG_LINEBUF) ? _IOLBF : _IONBF, 0);
+  }
+}
+
+// Full init needed by multiplexer or reentrant calls, calls singleinit at end
+void toy_init(struct toy_list *which, char *argv[])
+{
+  void *oldwhich = toys.which;
+
+  // Drop permissions for non-suid commands.
+  if (CFG_TOYBOX_SUID) {
+    if (!toys.which) toys.which = toy_list;
+
+    uid_t uid = getuid(), euid = geteuid();
+
+    if (!(which->flags & TOYFLAG_STAYROOT)) {
+      if (uid != euid) {
+        if (setuid(uid)) perror_exit("setuid %d->%d", euid, uid); // drop root
+        euid = uid;
+        toys.wasroot++;
+      }
+    } else if (CFG_TOYBOX_DEBUG && uid && which != toy_list)
+      error_msg("Not installed suid root");
+
+    if ((which->flags & TOYFLAG_NEEDROOT) && euid) {
+      toys.which = which;
+      check_help(argv+1);
+      help_exit("Not root");
+    }
+  }
+
+  // Free old toys contents (to be reentrant), but leave rebound if any
+  // don't blank old optargs if our new argc lives in the old optargs.
+  if (argv<toys.optargs || argv>toys.optargs+toys.optc) free(toys.optargs);
+  memset(&toys, 0, offsetof(struct toy_context, rebound));
+  if (oldwhich) memset(&this, 0, sizeof(this));
+
+  // Continue to portion of init needed by standalone commands
+  toy_singleinit(which, argv);
+}
+
+// Run an internal toybox command.
+// Only returns if it can't run command internally, otherwise xexit() when done.
+static void toy_exec_which(struct toy_list *which, char *argv[])
+{
+  // Return if we can't find it (which includes no multiplexer case),
+  if (!which || (which->flags&TOYFLAG_NOFORK)) return;
+
+  // Return if stack depth getting noticeable (proxy for leaked heap, etc).
+
+  // Compiler writers have decided subtracting char * is undefined behavior,
+  // so convert to integers. (LP64 says sizeof(long)==sizeof(pointer).)
+  // Signed typecast so stack growth direction is irrelevant: we're measuring
+  // the distance between two pointers on the same stack, hence the labs().
+  if (!CFG_TOYBOX_NORECURSE && toys.stacktop)
+    if (labs((long)toys.stacktop-(long)&which)>6000) return;
+
+  // Return if we need to re-exec to acquire root via suid bit.
+  if (toys.which && (which->flags&TOYFLAG_ROOTONLY) && toys.wasroot) return;
+
+  // Run command
+  toy_init(which, argv);
+  if (toys.which) toys.which->toy_main();
+  xexit();
+}
+
+// Lookup internal toybox command to run via argv[0]
+void toy_exec(char *argv[])
+{
+  toy_exec_which(toy_find(*argv), argv);
+}
+
+// Multiplexer command, first argument is command to run, rest are args to that.
+// If first argument starts with - output list of command install paths.
+void toybox_main(void)
+{
+  char *toy_paths[] = {"usr/", "bin/", "sbin/", 0}, *s = toys.argv[1];
+  int i, len = 0;
+  unsigned width = 80;
+
+  // fast path: try to exec immediately.
+  // (Leave toys.which null to disable suid return logic.)
+  // Try dereferencing symlinks until we hit a recognized name
+  while (s) {
+    char *ss = basename(s);
+    struct toy_list *tl = toy_find(ss);
+
+    if (tl==toy_list && s!=toys.argv[1]) unknown(ss);
+    toy_exec_which(tl, toys.argv+1);
+    s = (0<readlink(s, libbuf, sizeof(libbuf))) ? libbuf : 0;
+  }
+
+  // For early error reporting
+  toys.which = toy_list;
+
+  if (toys.argv[1] && strcmp(toys.argv[1], "--long")) unknown(toys.argv[1]);
+
+  // Output list of commands.
+  terminal_size(&width, 0);
+  for (i = 1; i<ARRAY_LEN(toy_list); i++) {
+    int fl = toy_list[i].flags;
+    if (fl & TOYMASK_LOCATION) {
+      if (toys.argv[1]) {
+        int j;
+        for (j = 0; toy_paths[j]; j++)
+          if (fl & (1<<j)) len += printf("%s", toy_paths[j]);
+      }
+      len += printf("%s",toy_list[i].name);
+      if (++len > width-15) len = 0;
+      xputc(len ? ' ' : '\n');
+    }
+  }
+  xputc('\n');
+}
+
+int main(int argc, char *argv[])
+{
+  // don't segfault if our environment is crazy
+  if (!*argv) return 127;
+
+  // Snapshot stack location so we can detect recursion depth later.
+  // Nommu has special reentry path, !stacktop = "vfork/exec self happened"
+  if (!CFG_TOYBOX_FORK && (0x80 & **argv)) **argv &= 0x7f;
+  else {
+    int stack_start;  // here so probe var won't permanently eat stack
+
+    toys.stacktop = &stack_start;
+  }
+
+  // Android before O had non-default SIGPIPE, 7 years = remove in Sep 2024.
+  if (CFG_TOYBOX_ON_ANDROID) signal(SIGPIPE, SIG_DFL);
+
+  if (CFG_TOYBOX) {
+    // Call the multiplexer with argv[] as its arguments so it can toy_find()
+    toys.argv = argv-1;
+    toybox_main();
+  } else {
+    // single command built standalone with no multiplexer is first list entry
+    toy_singleinit(toy_list, argv);
+    toy_list->toy_main();
+  }
+
+  xexit();
+}