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37 static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
41 #include <sys/cdefs.h>
42 #include <sys/types.h>
56 #define ISMAGICNO(p) \
57 (p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0'
59 static int exec_shell(const char *, const char *, const char *);
60 static void usage(void);
63 main(int argc, char *argv[])
67 int ch, debug, i, magic, n, nargs, rval;
70 char *cmd, *name, *p, *shell, *slashp, *tmpshell;
73 magic = '%'; /* Default magic char is `%'. */
75 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
78 if (optarg[0] == '\0' || optarg[1] != '\0')
80 "illegal magic character specification");
86 case '0': case '1': case '2': case '3': case '4':
87 case '5': case '6': case '7': case '8': case '9':
90 "only one -# argument may be specified");
103 * The command to run is argv[0], and the args are argv[1..].
104 * Look for %digit references in the command, remembering the
107 for (n = 0, p = argv[0]; *p != '\0'; ++p)
115 * Figure out the shell and name arguments to pass to execl()
116 * in exec_shell(). Always malloc() shell and just set name
117 * to point at the last part of shell if there are any backslashes,
118 * otherwise just set it to point at the space malloc()'d. If
119 * SHELL environment variable exists, replace contents of
123 tmpshell = getenv("SHELL");
124 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
126 err(1, "strdup() failed");
127 slashp = strrchr(shell, '/');
128 name = (slashp != NULL) ? slashp + 1 : shell;
131 * If there were any %digit references, then use those, otherwise
132 * build a new command string with sufficient %digit references at
133 * the end to consume (nargs) arguments each time round the loop.
134 * Allocate enough space to hold the maximum command. Save the
135 * size to pass to snprintf().
138 cmdsize = strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
139 if ((cmd = malloc(cmdsize)) == NULL)
141 strlcpy(cmd, argv[0], cmdsize);
143 /* If nargs not set, default to a single argument. */
147 for (i = 1; i <= nargs; i++) {
148 snprintf(buf, sizeof(buf), " %c%d", magic, i);
149 strlcat(cmd, buf, cmdsize);
153 * If nargs set to the special value 0, eat a single
154 * argument for each command execution.
159 if ((cmd = strdup(argv[0])) == NULL)
164 cmdbuf = sbuf_new(NULL, NULL, 1024, SBUF_AUTOEXTEND);
168 arg_max = sysconf(_SC_ARG_MAX);
171 * (argc) and (argv) are still offset by one to make it simpler to
172 * expand %digit references. At the end of the loop check for (argc)
173 * equals 1 means that all the (argv) has been consumed.
175 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
177 if (sbuf_cat(cmdbuf, "exec ") != 0)
179 /* Expand command argv references. */
180 for (p = cmd; *p != '\0'; ++p) {
182 if (sbuf_cat(cmdbuf, argv[*++p - '0']) != 0)
185 if (sbuf_putc(cmdbuf, *p) != 0)
188 if (sbuf_len(cmdbuf) > arg_max)
189 errc(1, E2BIG, NULL);
192 /* Terminate the command string. */
193 if (sbuf_finish(cmdbuf) != 0)
196 /* Run the command. */
198 (void)printf("%s\n", sbuf_data(cmdbuf));
200 if (exec_shell(sbuf_data(cmdbuf), shell, name))
205 errx(1, "expecting additional argument%s after \"%s\"",
206 (nargs - argc) ? "s" : "", argv[argc - 1]);
215 * Execute a shell command using passed use_shell and use_name
219 exec_shell(const char *command, const char *use_shell, const char *use_name)
223 sig_t intsave, quitsave;
225 if (!command) /* just checking... */
228 omask = sigblock(sigmask(SIGCHLD));
229 switch(pid = vfork()) {
233 (void)sigsetmask(omask);
234 execl(use_shell, use_name, "-c", command, (char *)NULL);
235 warn("%s", use_shell);
238 intsave = signal(SIGINT, SIG_IGN);
239 quitsave = signal(SIGQUIT, SIG_IGN);
240 pid = waitpid(pid, &pstat, 0);
241 (void)sigsetmask(omask);
242 (void)signal(SIGINT, intsave);
243 (void)signal(SIGQUIT, quitsave);
244 return(pid == -1 ? -1 : pstat);
251 (void)fprintf(stderr,
252 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n");