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32 * @(#)apply.c 8.4 (Berkeley) 4/4/94
33 * $FreeBSD: src/usr.bin/apply/apply.c,v 1.8.2.3 2001/08/01 23:28:04 obrien Exp $
36 #include <sys/types.h>
51 static int exec_shell(const char *, const char *, const char *);
52 static void usage(void);
55 main(int argc, char *argv[])
57 int ch, debug, i, magic, n, nargs, offset, rval;
58 size_t clen, cmdsize, l;
59 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell;
62 magic = '%'; /* Default magic char is `%'. */
64 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
67 if (optarg[1] != '\0')
69 "illegal magic character specification");
75 case '0': case '1': case '2': case '3': case '4':
76 case '5': case '6': case '7': case '8': case '9':
79 "only one -# argument may be specified");
92 * The command to run is argv[0], and the args are argv[1..].
93 * Look for %digit references in the command, remembering the
96 for (n = 0, p = argv[0]; *p != '\0'; ++p)
97 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
104 * Figure out the shell and name arguments to pass to execl()
105 * in exec_shell(). Always malloc() shell and just set name
106 * to point at the last part of shell if there are any backslashes,
107 * otherwise just set it to point at the space malloc()'d. If
108 * SHELL environment variable exists, replace contents of
112 tmpshell = getenv("SHELL");
113 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
115 err(1, "strdup() failed");
116 slashp = strrchr(shell, '/');
117 name = (slashp != NULL) ? slashp + 1 : shell;
120 * If there were any %digit references, then use those, otherwise
121 * build a new command string with sufficient %digit references at
122 * the end to consume (nargs) arguments each time round the loop.
123 * Allocate enough space to hold the maximum command. Save the
124 * size to pass to snprintf().
126 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0])
127 + 9 * (sizeof(" %1") - 1) + 1;
128 if ((cmd = malloc(cmdsize)) == NULL)
132 /* If nargs not set, default to a single argument. */
137 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
138 if ((size_t)offset >= cmdsize)
139 err(1, "snprintf() failed");
142 for (i = 1; i <= nargs; i++) {
143 offset = snprintf(p, cmdsize, " %c%d", magic, i);
144 if ((size_t)offset >= cmdsize)
145 err(1, "snprintf() failed");
151 * If nargs set to the special value 0, eat a single
152 * argument for each command execution.
157 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
158 if ((size_t)offset >= cmdsize)
159 err(1, "snprintf() failed");
164 * Grab some space in which to build the command. Allocate
165 * as necessary later, but no reason to build it up slowly
166 * for the normal case.
168 if ((c = malloc(clen = 1024)) == NULL)
172 * (argc) and (argv) are still offset by one to make it simpler to
173 * expand %digit references. At the end of the loop check for (argc)
174 * equals 1 means that all the (argv) has been consumed.
176 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
178 * Find a max value for the command length, and ensure
179 * there's enough space to build it.
181 for (l = strlen(cmd), i = 0; i < nargs; i++)
182 l += strlen(argv[i+1]);
183 if (l > clen && (c = realloc(c, clen = l)) == NULL)
186 /* Expand command argv references. */
187 for (p = cmd, q = c; *p != '\0'; ++p) {
188 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
189 offset = snprintf(q, l, "%s",
190 argv[(++p)[0] - '0']);
191 if ((size_t)offset >= l)
192 err(1, "snprintf() failed");
200 /* Terminate the command string. */
203 /* Run the command. */
207 if (exec_shell(c, shell, name))
213 errx(1, "expecting additional argument%s after \"%s\"",
214 (nargs - argc) ? "s" : "", argv[argc - 1]);
223 * Execute a shell command using passed use_shell and use_name
227 exec_shell(const char *command, const char *use_shell, const char *use_name)
231 sig_t intsave, quitsave;
233 if (command == NULL) /* just checking... */
236 omask = sigblock(sigmask(SIGCHLD));
237 switch(pid = vfork()) {
241 (void)sigsetmask(omask);
242 execl(use_shell, use_name, "-c", command, NULL);
243 warn("%s", use_shell);
246 intsave = signal(SIGINT, SIG_IGN);
247 quitsave = signal(SIGQUIT, SIG_IGN);
248 pid = waitpid(pid, &pstat, 0);
250 signal(SIGINT, intsave);
251 signal(SIGQUIT, quitsave);
252 return(pid == -1 ? -1 : pstat);
259 "usage: apply [-a magic] [-d] [-0123456789] "
260 "command arguments ...\n");