Annotation of src/usr.bin/apply/apply.c, Revision 1.1
1.1 ! deraadt 1: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass 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: #ifndef lint
! 40: #if 0
! 41: static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
! 42: #else
! 43: static char rcsid[] = "$NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $";
! 44: #endif
! 45: #endif /* not lint */
! 46:
! 47: #include <sys/wait.h>
! 48:
! 49: #include <ctype.h>
! 50: #include <err.h>
! 51: #include <paths.h>
! 52: #include <signal.h>
! 53: #include <stdio.h>
! 54: #include <stdlib.h>
! 55: #include <string.h>
! 56: #include <unistd.h>
! 57:
! 58: void usage __P((void));
! 59: int system __P((const char *));
! 60:
! 61: int
! 62: main(argc, argv)
! 63: int argc;
! 64: char *argv[];
! 65: {
! 66: int ch, clen, debug, i, l, magic, n, nargs, rval;
! 67: char *c, *cmd, *p, *q;
! 68:
! 69: debug = 0;
! 70: magic = '%'; /* Default magic char is `%'. */
! 71: nargs = -1;
! 72: while ((ch = getopt(argc, argv, "a:d0123456789")) != EOF)
! 73: switch (ch) {
! 74: case 'a':
! 75: if (optarg[1] != '\0')
! 76: errx(1,
! 77: "illegal magic character specification.");
! 78: magic = optarg[0];
! 79: break;
! 80: case 'd':
! 81: debug = 1;
! 82: break;
! 83: case '0': case '1': case '2': case '3': case '4':
! 84: case '5': case '6': case '7': case '8': case '9':
! 85: if (nargs != -1)
! 86: errx(1,
! 87: "only one -# argument may be specified.");
! 88: nargs = optopt - '0';
! 89: break;
! 90: default:
! 91: usage();
! 92: }
! 93: argc -= optind;
! 94: argv += optind;
! 95:
! 96: if (argc < 2)
! 97: usage();
! 98:
! 99: /*
! 100: * The command to run is argv[0], and the args are argv[1..].
! 101: * Look for %digit references in the command, remembering the
! 102: * largest one.
! 103: */
! 104: for (n = 0, p = argv[0]; *p != '\0'; ++p)
! 105: if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
! 106: ++p;
! 107: if (p[0] - '0' > n)
! 108: n = p[0] - '0';
! 109: }
! 110:
! 111: /*
! 112: * If there were any %digit references, then use those, otherwise
! 113: * build a new command string with sufficient %digit references at
! 114: * the end to consume (nargs) arguments each time round the loop.
! 115: * Allocate enough space to hold the maximum command.
! 116: */
! 117: if ((cmd = malloc(sizeof("exec ") - 1 +
! 118: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
! 119: err(1, NULL);
! 120:
! 121: if (n == 0) {
! 122: /* If nargs not set, default to a single argument. */
! 123: if (nargs == -1)
! 124: nargs = 1;
! 125:
! 126: p = cmd;
! 127: p += sprintf(cmd, "exec %s", argv[0]);
! 128: for (i = 1; i <= nargs; i++)
! 129: p += sprintf(p, " %c%d", magic, i);
! 130:
! 131: /*
! 132: * If nargs set to the special value 0, eat a single
! 133: * argument for each command execution.
! 134: */
! 135: if (nargs == 0)
! 136: nargs = 1;
! 137: } else {
! 138: (void)sprintf(cmd, "exec %s", argv[0]);
! 139: nargs = n;
! 140: }
! 141:
! 142: /*
! 143: * Grab some space in which to build the command. Allocate
! 144: * as necessary later, but no reason to build it up slowly
! 145: * for the normal case.
! 146: */
! 147: if ((c = malloc(clen = 1024)) == NULL)
! 148: err(1, NULL);
! 149:
! 150: /*
! 151: * (argc) and (argv) are still offset by one to make it simpler to
! 152: * expand %digit references. At the end of the loop check for (argc)
! 153: * equals 1 means that all the (argv) has been consumed.
! 154: */
! 155: for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
! 156: /*
! 157: * Find a max value for the command length, and ensure
! 158: * there's enough space to build it.
! 159: */
! 160: for (l = strlen(cmd), i = 0; i < nargs; i++)
! 161: l += strlen(argv[i]);
! 162: if (l > clen && (c = realloc(c, clen = l)) == NULL)
! 163: err(1, NULL);
! 164:
! 165: /* Expand command argv references. */
! 166: for (p = cmd, q = c; *p != '\0'; ++p)
! 167: if (p[0] == magic && isdigit(p[1]) && p[1] != '0')
! 168: q += sprintf(q, "%s", argv[(++p)[0] - '0']);
! 169: else
! 170: *q++ = *p;
! 171:
! 172: /* Terminate the command string. */
! 173: *q = '\0';
! 174:
! 175: /* Run the command. */
! 176: if (debug)
! 177: (void)printf("%s\n", c);
! 178: else
! 179: if (system(c))
! 180: rval = 1;
! 181: }
! 182:
! 183: if (argc != 1)
! 184: errx(1, "expecting additional argument%s after \"%s\"",
! 185: (nargs - argc) ? "s" : "", argv[argc - 1]);
! 186: exit(rval);
! 187: }
! 188:
! 189: /*
! 190: * system --
! 191: * Private version of system(3). Use the user's SHELL environment
! 192: * variable as the shell to execute.
! 193: */
! 194: int
! 195: system(command)
! 196: const char *command;
! 197: {
! 198: static char *name, *shell;
! 199: union wait pstat;
! 200: pid_t pid;
! 201: int omask;
! 202: sig_t intsave, quitsave;
! 203:
! 204: if (shell == NULL) {
! 205: if ((shell = getenv("SHELL")) == NULL)
! 206: shell = _PATH_BSHELL;
! 207: if ((name = strrchr(shell, '/')) == NULL)
! 208: name = shell;
! 209: else
! 210: ++name;
! 211: }
! 212: if (!command) /* just checking... */
! 213: return(1);
! 214:
! 215: omask = sigblock(sigmask(SIGCHLD));
! 216: switch(pid = vfork()) {
! 217: case -1: /* error */
! 218: err(1, "fork");
! 219: case 0: /* child */
! 220: (void)sigsetmask(omask);
! 221: execl(shell, name, "-c", command, NULL);
! 222: err(1, "%s", shell);
! 223: }
! 224: intsave = signal(SIGINT, SIG_IGN);
! 225: quitsave = signal(SIGQUIT, SIG_IGN);
! 226: pid = waitpid(pid, (int *)&pstat, 0);
! 227: (void)sigsetmask(omask);
! 228: (void)signal(SIGINT, intsave);
! 229: (void)signal(SIGQUIT, quitsave);
! 230: return(pid == -1 ? -1 : pstat.w_status);
! 231: }
! 232:
! 233: void
! 234: usage()
! 235: {
! 236:
! 237: (void)fprintf(stderr,
! 238: "usage: apply [-a magic] [-0123456789] command arguments ...\n");
! 239: exit(1);
! 240: }
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