install-check.c

   1 /* install-check
   2  * Copyright (C) 2002 Manish Singh
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <errno.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <sys/wait.h>
  27
  28 static void
  29 compare (const char *f1,
  30          const char *f2)
  31 {
  32   struct stat b1, b2;
  33   int status;
  34   pid_t pid, rpid;
  35
  36   if (stat (f2, &b2) || stat (f1, &b1))
  37     return;
  38
  39   if (b1.st_size != b2.st_size)
  40     return;
  41
  42   pid = fork ();
  43
  44   if (pid == 0)
  45     execlp ("cmp", "cmp", "-s", f1, f2, NULL);
  46   else if (pid < 0)
  47     return;
  48
  49   do
  50     rpid = waitpid (pid, &status, 0);
  51   while (rpid == -1 && errno == EINTR);
  52
  53   if (rpid != pid)
  54     status = -1;
  55
  56   if (status != -1 && WIFEXITED (status) && WEXITSTATUS (status) == 0)
  57     exit (0);
  58 }
  59
  60 int
  61 main (int    argc,
  62       char **argv)
  63 {
  64   struct stat buf;
  65   char **args;
  66   int i, len;
  67   char *dot, *lastarg, *start;
  68
  69   lastarg = argv[argc - 1];
  70
  71   dot = strrchr (lastarg, '.');
  72   if (dot == NULL)
  73     {
  74       len = strlen (lastarg);
  75       if (len < strlen ("orbit-idl-2"))
  76         goto install;
  77
  78       start = lastarg + len - strlen ("orbit-idl-2");
  79       if (strcmp (start, "orbit-idl-2") != 0)
  80         goto install;
  81     }
  82   else if (dot[1] != 'h' && dot[1] != 'c' && strcmp (dot + 1, "idl") != 0)
  83     goto install;
  84
  85   if ((argc == 4) &&
  86       (strcmp (argv[1], "-c") == 0) &&
  87       (strcmp (argv[2], "-d") != 0) &&
  88       !stat (argv[3], &buf) &&
  89       !S_ISDIR (buf.st_mode))
  90     compare (argv[2], argv[3]);
  91   else if ((argc == 3) &&
  92            (strcmp (argv[1], "-d") != 0) &&
  93            !stat (argv[2], &buf) &&
  94            !S_ISDIR (buf.st_mode))
  95     compare (argv[1], argv[2]);
  96   else if ((argc == 6) &&
  97            (strcmp (argv[1], "-c") == 0) &&
  98            (strcmp (argv[2], "-m") == 0) &&
  99            !stat (argv[5], &buf) &&
 100            !S_ISDIR (buf.st_mode))
 101     compare (argv[4], argv[5]);
 102   else if ((argc == 5) &&
 103            (strcmp (argv[1], "-m") == 0) &&
 104            !stat (argv[4], &buf) &&
 105            !S_ISDIR (buf.st_mode))
 106     compare (argv[3], argv[4]);
 107
 108 install:
 109   args = malloc (sizeof (char *) * (argc + 1));
 110
 111 #ifndef WITH_INSTALL
 112   args[0] = "install";
 113 #else
 114   args[0] = WITH_INSTALL;
 115 #endif
 116
 117   for (i = 1; i < argc; i++)
 118     args[i] = argv[i];
 119
 120   args[argc] = NULL;
 121
 122   execvp (args[0], args);
 123   perror("executing 'install' failed");
 124
 125   return 1;
 126 }