apply/apply.c

   1 /*      $NetBSD: apply.c,v 1.6 1997/12/31 05:53:45 thorpej Exp $        */
   2
   3 /*-
   4  * Copyright (c) 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Jan-Simon Pendry.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)apply.c     8.4 (Berkeley) 4/4/94";
  43 #else
  44 __RCSID("$NetBSD: apply.c,v 1.6 1997/12/31 05:53:45 thorpej Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <sys/wait.h>
  49
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <paths.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 int     main __P((int, char **));
  60 void    usage __P((void));
  61 int     system __P((const char *));
  62
  63 int
  64 main(argc, argv)
  65         int argc;
  66         char *argv[];
  67 {
  68         int ch, clen, debug, i, l, magic, n, nargs, rval;
  69         char *c, *cmd, *p, *q;
  70
  71         debug = 0;
  72         magic = '%';            /* Default magic char is `%'. */
  73         nargs = -1;
  74         while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
  75                 switch (ch) {
  76                 case 'a':
  77                         if (optarg[1] != '\0')
  78                                 errx(1,
  79                                     "illegal magic character specification.");
  80                         magic = optarg[0];
  81                         break;
  82                 case 'd':
  83                         debug = 1;
  84                         break;
  85                 case '0': case '1': case '2': case '3': case '4':
  86                 case '5': case '6': case '7': case '8': case '9':
  87                         if (nargs != -1)
  88                                 errx(1,
  89                                     "only one -# argument may be specified.");
  90                         nargs = optopt - '0';
  91                         break;
  92                 default:
  93                         usage();
  94                 }
  95         argc -= optind;
  96         argv += optind;
  97
  98         if (argc < 2)
  99                 usage();
 100
 101         /*
 102          * The command to run is argv[0], and the args are argv[1..].
 103          * Look for %digit references in the command, remembering the
 104          * largest one.
 105          */
 106         for (n = 0, p = argv[0]; *p != '\0'; ++p)
 107                 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
 108                         ++p;
 109                         if (p[0] - '0' > n)
 110                                 n = p[0] - '0';
 111                 }
 112
 113         /*
 114          * If there were any %digit references, then use those, otherwise
 115          * build a new command string with sufficient %digit references at
 116          * the end to consume (nargs) arguments each time round the loop.
 117          * Allocate enough space to hold the maximum command.
 118          */
 119         if ((cmd = malloc(sizeof("exec ") - 1 +
 120             strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
 121                 err(1, "malloc");
 122
 123         if (n == 0) {
 124                 /* If nargs not set, default to a single argument. */
 125                 if (nargs == -1)
 126                         nargs = 1;
 127
 128                 p = cmd;
 129                 p += sprintf(cmd, "exec %s", argv[0]);
 130                 for (i = 1; i <= nargs; i++)
 131                         p += sprintf(p, " %c%d", magic, i);
 132
 133                 /*
 134                  * If nargs set to the special value 0, eat a single
 135                  * argument for each command execution.
 136                  */
 137                 if (nargs == 0)
 138                         nargs = 1;
 139         } else {
 140                 (void)sprintf(cmd, "exec %s", argv[0]);
 141                 nargs = n;
 142         }
 143
 144         /*
 145          * Grab some space in which to build the command.  Allocate
 146          * as necessary later, but no reason to build it up slowly
 147          * for the normal case.
 148          */
 149         if ((c = malloc(clen = 1024)) == NULL)
 150                 err(1, "malloc");
 151
 152         /*
 153          * (argc) and (argv) are still offset by one to make it simpler to
 154          * expand %digit references.  At the end of the loop check for (argc)
 155          * equals 1 means that all the (argv) has been consumed.
 156          */
 157         for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
 158                 /*
 159                  * Find a max value for the command length, and ensure
 160                  * there's enough space to build it.
 161                  */
 162                 for (l = strlen(cmd), i = 0; i < nargs; i++)
 163                         l += strlen(argv[i]);
 164                 if (l > clen && (c = realloc(c, clen = l)) == NULL)
 165                         err(1, "malloc");
 166
 167                 /* Expand command argv references. */
 168                 for (p = cmd, q = c; *p != '\0'; ++p)
 169                         if (p[0] == magic && isdigit(p[1]) && p[1] != '0')
 170                                 q += sprintf(q, "%s", argv[(++p)[0] - '0']);
 171                         else
 172                                 *q++ = *p;
 173
 174                 /* Terminate the command string. */
 175                 *q = '\0';
 176
 177                 /* Run the command. */
 178                 if (debug)
 179                         (void)printf("%s\n", c);
 180                 else
 181                         if (system(c))
 182                                 rval = 1;
 183         }
 184
 185         if (argc != 1)
 186                 errx(1, "expecting additional argument%s after \"%s\"",
 187                     (nargs - argc) ? "s" : "", argv[argc - 1]);
 188         exit(rval);
 189 }
 190
 191 /*
 192  * system --
 193  *      Private version of system(3).  Use the user's SHELL environment
 194  *      variable as the shell to execute.
 195  */
 196 int
 197 system(command)
 198         const char *command;
 199 {
 200         static char *name, *shell;
 201         union wait pstat;
 202         pid_t pid;
 203         int omask;
 204         sig_t intsave, quitsave;
 205
 206         if (shell == NULL) {
 207                 if ((shell = getenv("SHELL")) == NULL)
 208                         shell = _PATH_BSHELL;
 209                 if ((name = strrchr(shell, '/')) == NULL)
 210                         name = shell;
 211                 else
 212                         ++name;
 213         }
 214         if (!command)           /* just checking... */
 215                 return(1);
 216
 217         omask = sigblock(sigmask(SIGCHLD));
 218         switch(pid = vfork()) {
 219         case -1:                        /* error */
 220                 err(1, "vfork");
 221         case 0:                         /* child */
 222                 (void)sigsetmask(omask);
 223                 execl(shell, name, "-c", command, NULL);
 224                 warn("%s", shell);
 225                 _exit(1);
 226         }
 227         intsave = signal(SIGINT, SIG_IGN);
 228         quitsave = signal(SIGQUIT, SIG_IGN);
 229         pid = waitpid(pid, (int *)&pstat, 0);
 230         (void)sigsetmask(omask);
 231         (void)signal(SIGINT, intsave);
 232         (void)signal(SIGQUIT, quitsave);
 233         return(pid == -1 ? -1 : pstat.w_status);
 234 }
 235
 236 void
 237 usage()
 238 {
 239
 240         (void)fprintf(stderr,
 241             "usage: apply [-a magic] [-0123456789] command arguments ...\n");
 242         exit(1);
 243 }