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36 * @(#)apply.c 8.4 (Berkeley) 4/4/94
37 * $FreeBSD: src/usr.bin/apply/apply.c,v 1.8.2.3 2001/08/01 23:28:04 obrien Exp $
38 * $DragonFly: src/usr.bin/apply/apply.c,v 1.5 2005/01/04 05:45:02 cpressey Exp $
41 #include <sys/types.h>
56 static int exec_shell(const char *, char *, char *);
57 static void usage(void);
60 main(int argc, char *argv[])
62 int ch, debug, i, magic, n, nargs, offset, rval;
63 size_t clen, cmdsize, l;
64 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell;
67 magic = '%'; /* Default magic char is `%'. */
69 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
72 if (optarg[1] != '\0')
74 "illegal magic character specification");
80 case '0': case '1': case '2': case '3': case '4':
81 case '5': case '6': case '7': case '8': case '9':
84 "only one -# argument may be specified");
97 * The command to run is argv[0], and the args are argv[1..].
98 * Look for %digit references in the command, remembering the
101 for (n = 0, p = argv[0]; *p != '\0'; ++p)
102 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
109 * Figure out the shell and name arguments to pass to execl()
110 * in exec_shell(). Always malloc() shell and just set name
111 * to point at the last part of shell if there are any backslashes,
112 * otherwise just set it to point at the space malloc()'d. If
113 * SHELL environment variable exists, replace contents of
117 tmpshell = getenv("SHELL");
118 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
120 err(1, "strdup() failed");
121 slashp = strrchr(shell, '/');
122 name = (slashp != NULL) ? slashp + 1 : shell;
125 * If there were any %digit references, then use those, otherwise
126 * build a new command string with sufficient %digit references at
127 * the end to consume (nargs) arguments each time round the loop.
128 * Allocate enough space to hold the maximum command. Save the
129 * size to pass to snprintf().
131 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0])
132 + 9 * (sizeof(" %1") - 1) + 1;
133 if ((cmd = malloc(cmdsize)) == NULL)
137 /* If nargs not set, default to a single argument. */
142 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
143 if ((size_t)offset >= cmdsize)
144 err(1, "snprintf() failed");
147 for (i = 1; i <= nargs; i++) {
148 offset = snprintf(p, cmdsize, " %c%d", magic, i);
149 if ((size_t)offset >= cmdsize)
150 err(1, "snprintf() failed");
156 * If nargs set to the special value 0, eat a single
157 * argument for each command execution.
162 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
163 if ((size_t)offset >= cmdsize)
164 err(1, "snprintf() failed");
169 * Grab some space in which to build the command. Allocate
170 * as necessary later, but no reason to build it up slowly
171 * for the normal case.
173 if ((c = malloc(clen = 1024)) == NULL)
177 * (argc) and (argv) are still offset by one to make it simpler to
178 * expand %digit references. At the end of the loop check for (argc)
179 * equals 1 means that all the (argv) has been consumed.
181 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
183 * Find a max value for the command length, and ensure
184 * there's enough space to build it.
186 for (l = strlen(cmd), i = 0; i < nargs; i++)
187 l += strlen(argv[i+1]);
188 if (l > clen && (c = realloc(c, clen = l)) == NULL)
191 /* Expand command argv references. */
192 for (p = cmd, q = c; *p != '\0'; ++p) {
193 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
194 offset = snprintf(q, l, "%s",
195 argv[(++p)[0] - '0']);
196 if ((size_t)offset >= l)
197 err(1, "snprintf() failed");
205 /* Terminate the command string. */
208 /* Run the command. */
212 if (exec_shell(c, shell, name))
218 errx(1, "expecting additional argument%s after \"%s\"",
219 (nargs - argc) ? "s" : "", argv[argc - 1]);
228 * Execute a shell command using passed use_shell and use_name
232 exec_shell(const char *command, char *use_shell, char *use_name)
236 sig_t intsave, quitsave;
238 if (command == NULL) /* just checking... */
241 omask = sigblock(sigmask(SIGCHLD));
242 switch(pid = vfork()) {
246 (void)sigsetmask(omask);
247 execl(use_shell, use_name, "-c", command, (char *)NULL);
248 warn("%s", use_shell);
251 intsave = signal(SIGINT, SIG_IGN);
252 quitsave = signal(SIGQUIT, SIG_IGN);
253 pid = waitpid(pid, &pstat, 0);
255 signal(SIGINT, intsave);
256 signal(SIGQUIT, quitsave);
257 return(pid == -1 ? -1 : pstat);
264 "usage: apply [-a magic] [-d] [-0123456789] "
265 "command arguments ...\n");