Annotation of src/usr.bin/apply/apply.c, Revision 1.26
1.26 ! deraadt 1: /* $OpenBSD: apply.c,v 1.25 2011/04/29 05:45:11 lum Exp $ */
1.1 deraadt 2: /* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
3:
4: /*-
5: * Copyright (c) 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Jan-Simon Pendry.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.14 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #include <sys/wait.h>
37:
38: #include <ctype.h>
39: #include <err.h>
40: #include <paths.h>
41: #include <signal.h>
42: #include <stdio.h>
43: #include <stdlib.h>
44: #include <string.h>
45: #include <unistd.h>
46:
1.25 lum 47: __dead void usage(void);
48: static int mysystem(const char *);
1.1 deraadt 49:
50: int
1.15 deraadt 51: main(int argc, char *argv[])
1.1 deraadt 52: {
53: int ch, clen, debug, i, l, magic, n, nargs, rval;
1.17 mickey 54: char *c, *c2, *cmd, *p, *q;
1.12 deraadt 55: size_t len;
1.1 deraadt 56:
57: debug = 0;
58: magic = '%'; /* Default magic char is `%'. */
59: nargs = -1;
1.3 millert 60: while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
1.1 deraadt 61: switch (ch) {
62: case 'a':
63: if (optarg[1] != '\0')
64: errx(1,
65: "illegal magic character specification.");
66: magic = optarg[0];
67: break;
68: case 'd':
69: debug = 1;
70: break;
71: case '0': case '1': case '2': case '3': case '4':
72: case '5': case '6': case '7': case '8': case '9':
73: if (nargs != -1)
74: errx(1,
75: "only one -# argument may be specified.");
1.20 jaredy 76: nargs = ch - '0';
1.1 deraadt 77: break;
78: default:
79: usage();
80: }
81: argc -= optind;
82: argv += optind;
83:
84: if (argc < 2)
85: usage();
86:
87: /*
88: * The command to run is argv[0], and the args are argv[1..].
89: * Look for %digit references in the command, remembering the
90: * largest one.
91: */
92: for (n = 0, p = argv[0]; *p != '\0'; ++p)
1.26 ! deraadt 93: if (p[0] == magic &&
! 94: isdigit((unsigned char)p[1]) && p[1] != '0') {
1.1 deraadt 95: ++p;
96: if (p[0] - '0' > n)
97: n = p[0] - '0';
98: }
99:
100: /*
101: * If there were any %digit references, then use those, otherwise
102: * build a new command string with sufficient %digit references at
103: * the end to consume (nargs) arguments each time round the loop.
104: * Allocate enough space to hold the maximum command.
105: */
106: if (n == 0) {
1.22 deraadt 107: len = sizeof("exec ") - 1 +
108: strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
109: if ((cmd = malloc(len)) == NULL)
110: err(1, NULL);
111:
1.1 deraadt 112: /* If nargs not set, default to a single argument. */
113: if (nargs == -1)
114: nargs = 1;
115:
1.12 deraadt 116: l = snprintf(cmd, len, "exec %s", argv[0]);
1.19 jsg 117: if (l >= len || l == -1)
118: errx(1, "error building exec string");
1.12 deraadt 119: len -= l;
120: p = cmd + l;
121:
122: for (i = 1; i <= nargs; i++) {
123: l = snprintf(p, len, " %c%d", magic, i);
1.19 jsg 124: if (l >= len || l == -1)
125: errx(1, "error numbering arguments");
1.12 deraadt 126: len -= l;
127: p += l;
128: }
1.1 deraadt 129:
130: /*
131: * If nargs set to the special value 0, eat a single
132: * argument for each command execution.
133: */
134: if (nargs == 0)
135: nargs = 1;
136: } else {
1.22 deraadt 137: if (asprintf(&cmd, "exec %s", argv[0]) == -1)
138: err(1, NULL);
1.1 deraadt 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++)
1.6 deraadt 161: l += strlen(argv[i+1]);
1.16 tedu 162: if (l > clen) {
163: if ((c2 = realloc(c, l)) == NULL)
164: err(1, NULL);
165: c = c2;
166: clen = l;
167: }
1.1 deraadt 168:
169: /* Expand command argv references. */
170: for (p = cmd, q = c; *p != '\0'; ++p)
1.26 ! deraadt 171: if (p[0] == magic &&
! 172: isdigit((unsigned char)p[1]) && p[1] != '0') {
1.13 deraadt 173: strlcpy(q, argv[(++p)[0] - '0'], c + clen - q);
1.12 deraadt 174: q += strlen(q);
175: } else
1.1 deraadt 176: *q++ = *p;
177:
178: /* Terminate the command string. */
179: *q = '\0';
180:
181: /* Run the command. */
182: if (debug)
183: (void)printf("%s\n", c);
1.25 lum 184: else if (mysystem(c))
185: rval = 1;
1.1 deraadt 186: }
187:
188: if (argc != 1)
189: errx(1, "expecting additional argument%s after \"%s\"",
190: (nargs - argc) ? "s" : "", argv[argc - 1]);
191: exit(rval);
192: }
193:
194: /*
1.25 lum 195: * mysystem --
1.1 deraadt 196: * Private version of system(3). Use the user's SHELL environment
197: * variable as the shell to execute.
198: */
1.25 lum 199: static int
1.18 deraadt 200: mysystem(const char *command)
1.1 deraadt 201: {
1.25 lum 202: static const char *name, *shell;
1.1 deraadt 203: pid_t pid;
1.10 millert 204: int pstat;
205: sigset_t mask, omask;
1.1 deraadt 206: sig_t intsave, quitsave;
207:
208: if (shell == NULL) {
209: if ((shell = getenv("SHELL")) == NULL)
210: shell = _PATH_BSHELL;
211: if ((name = strrchr(shell, '/')) == NULL)
212: name = shell;
213: else
214: ++name;
215: }
216: if (!command) /* just checking... */
217: return(1);
218:
1.10 millert 219: sigemptyset(&mask);
220: sigaddset(&mask, SIGCHLD);
221: sigprocmask(SIG_BLOCK, &mask, &omask);
1.4 bitblt 222: switch(pid = fork()) {
1.1 deraadt 223: case -1: /* error */
224: err(1, "fork");
225: case 0: /* child */
1.10 millert 226: sigprocmask(SIG_SETMASK, &omask, NULL);
1.9 deraadt 227: execl(shell, name, "-c", command, (char *)NULL);
1.1 deraadt 228: err(1, "%s", shell);
229: }
230: intsave = signal(SIGINT, SIG_IGN);
231: quitsave = signal(SIGQUIT, SIG_IGN);
1.5 deraadt 232: pid = waitpid(pid, &pstat, 0);
1.10 millert 233: sigprocmask(SIG_SETMASK, &omask, NULL);
1.1 deraadt 234: (void)signal(SIGINT, intsave);
235: (void)signal(SIGQUIT, quitsave);
1.5 deraadt 236: return(pid == -1 ? -1 : pstat);
1.1 deraadt 237: }
238:
1.25 lum 239: __dead void
1.15 deraadt 240: usage(void)
1.1 deraadt 241: {
242: (void)fprintf(stderr,
1.21 jaredy 243: "usage: apply [-#] [-d] [-a magic] command argument ...\n");
1.1 deraadt 244: exit(1);
245: }
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