2 * SPDX-License-Identifier: BSD-3-Clause
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37 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
44 #include <sys/types.h>
58 #define ISMAGICNO(p) \
59 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0'
61 static int exec_shell(const char *, const char *, const char *);
62 static void usage(void);
65 main(int argc, char *argv[])
69 int ch, debug, i, magic, n, nargs, rval;
72 char *cmd, *name, *p, *shell, *slashp, *tmpshell;
75 magic = '%'; /* Default magic char is `%'. */
77 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
80 if (optarg[0] == '\0' || optarg[1] != '\0')
82 "illegal magic character specification");
88 case '0': case '1': case '2': case '3': case '4':
89 case '5': case '6': case '7': case '8': case '9':
92 "only one -# argument may be specified");
105 * The command to run is argv[0], and the args are argv[1..].
106 * Look for %digit references in the command, remembering the
109 for (n = 0, p = argv[0]; *p != '\0'; ++p)
117 * Figure out the shell and name arguments to pass to execl()
118 * in exec_shell(). Always malloc() shell and just set name
119 * to point at the last part of shell if there are any backslashes,
120 * otherwise just set it to point at the space malloc()'d. If
121 * SHELL environment variable exists, replace contents of
125 tmpshell = getenv("SHELL");
126 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
128 err(1, "strdup() failed");
129 slashp = strrchr(shell, '/');
130 name = (slashp != NULL) ? slashp + 1 : shell;
133 * If there were any %digit references, then use those, otherwise
134 * build a new command string with sufficient %digit references at
135 * the end to consume (nargs) arguments each time round the loop.
136 * Allocate enough space to hold the maximum command. Save the
137 * size to pass to snprintf().
140 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
141 if ((cmd = malloc(cmdsize)) == NULL)
143 strlcpy(cmd, argv[0], cmdsize);
145 /* If nargs not set, default to a single argument. */
149 for (i = 1; i <= nargs; i++) {
150 snprintf(buf, sizeof(buf), " %c%d", magic, i);
151 strlcat(cmd, buf, cmdsize);
155 * If nargs set to the special value 0, eat a single
156 * argument for each command execution.
161 if ((cmd = strdup(argv[0])) == NULL)
166 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND);
170 arg_max = sysconf(_SC_ARG_MAX);
173 * (argc) and (argv) are still offset by one to make it simpler to
174 * expand %digit references. At the end of the loop check for (argc)
175 * equals 1 means that all the (argv) has been consumed.
177 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
179 sbuf_cat(cmdbuf, "exec ");
180 /* Expand command argv references. */
181 for (p = cmd; *p != '\0'; ++p) {
183 if (sbuf_cat(cmdbuf, argv[(++p)[0] - '0'])
185 errc(1, ENOMEM, "sbuf");
187 if (sbuf_putc(cmdbuf, *p) == -1)
188 errc(1, ENOMEM, "sbuf");
190 if (sbuf_len(cmdbuf) > arg_max)
191 errc(1, E2BIG, NULL);
194 /* Terminate the command string. */
197 /* Run the command. */
199 (void)printf("%s\n", sbuf_data(cmdbuf));
201 if (exec_shell(sbuf_data(cmdbuf), shell, name))
206 errx(1, "expecting additional argument%s after \"%s\"",
207 (nargs - argc) ? "s" : "", argv[argc - 1]);
216 * Execute a shell command using passed use_shell and use_name
220 exec_shell(const char *command, const char *use_shell, const char *use_name)
224 sig_t intsave, quitsave;
226 if (!command) /* just checking... */
229 omask = sigblock(sigmask(SIGCHLD));
230 switch(pid = vfork()) {
234 (void)sigsetmask(omask);
235 execl(use_shell, use_name, "-c", command, (char *)NULL);
236 warn("%s", use_shell);
239 intsave = signal(SIGINT, SIG_IGN);
240 quitsave = signal(SIGQUIT, SIG_IGN);
241 pid = waitpid(pid, &pstat, 0);
242 (void)sigsetmask(omask);
243 (void)signal(SIGINT, intsave);
244 (void)signal(SIGQUIT, quitsave);
245 return(pid == -1 ? -1 : pstat);
252 (void)fprintf(stderr,
253 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n");