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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 1.2 2003/06/17 04:29:25 dillon 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[]) {
61 int ch, debug, i, magic, n, nargs, offset, rval;
62 size_t clen, cmdsize, l;
63 char *c, *cmd, *name, *p, *q, *shell, *slashp, *tmpshell;
66 magic = '%'; /* Default magic char is `%'. */
68 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
71 if (optarg[1] != '\0')
73 "illegal magic character specification");
79 case '0': case '1': case '2': case '3': case '4':
80 case '5': case '6': case '7': case '8': case '9':
83 "only one -# argument may be specified");
96 * The command to run is argv[0], and the args are argv[1..].
97 * Look for %digit references in the command, remembering the
100 for (n = 0, p = argv[0]; *p != '\0'; ++p)
101 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
108 * Figure out the shell and name arguments to pass to execl()
109 * in exec_shell(). Always malloc() shell and just set name
110 * to point at the last part of shell if there are any backslashes,
111 * otherwise just set it to point at the space malloc()'d. If
112 * SHELL environment variable exists, replace contents of
116 tmpshell = getenv("SHELL");
117 shell = (tmpshell != NULL) ? strdup(tmpshell) : strdup(_PATH_BSHELL);
119 err(1, "strdup() failed");
120 slashp = strrchr(shell, '/');
121 name = (slashp != NULL) ? slashp + 1 : shell;
124 * If there were any %digit references, then use those, otherwise
125 * build a new command string with sufficient %digit references at
126 * the end to consume (nargs) arguments each time round the loop.
127 * Allocate enough space to hold the maximum command. Save the
128 * size to pass to snprintf().
130 cmdsize = sizeof(EXEC) - 1 + strlen(argv[0])
131 + 9 * (sizeof(" %1") - 1) + 1;
132 if ((cmd = malloc(cmdsize)) == NULL)
136 /* If nargs not set, default to a single argument. */
141 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
142 if ((size_t)offset >= cmdsize)
143 err(1, "snprintf() failed");
146 for (i = 1; i <= nargs; i++) {
147 offset = snprintf(p, cmdsize, " %c%d", magic, i);
148 if ((size_t)offset >= cmdsize)
149 err(1, "snprintf() failed");
155 * If nargs set to the special value 0, eat a single
156 * argument for each command execution.
161 offset = snprintf(cmd, cmdsize, EXEC "%s", argv[0]);
162 if ((size_t)offset >= cmdsize)
163 err(1, "snprintf() failed");
168 * Grab some space in which to build the command. Allocate
169 * as necessary later, but no reason to build it up slowly
170 * for the normal case.
172 if ((c = malloc(clen = 1024)) == NULL)
176 * (argc) and (argv) are still offset by one to make it simpler to
177 * expand %digit references. At the end of the loop check for (argc)
178 * equals 1 means that all the (argv) has been consumed.
180 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
182 * Find a max value for the command length, and ensure
183 * there's enough space to build it.
185 for (l = strlen(cmd), i = 0; i < nargs; i++)
186 l += strlen(argv[i+1]);
187 if (l > clen && (c = realloc(c, clen = l)) == NULL)
190 /* Expand command argv references. */
191 for (p = cmd, q = c; *p != '\0'; ++p)
192 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
193 offset = snprintf(q, l, "%s",
194 argv[(++p)[0] - '0']);
195 if ((size_t)offset >= l)
196 err(1, "snprintf() failed");
202 /* Terminate the command string. */
205 /* Run the command. */
207 (void)printf("%s\n", c);
209 if (exec_shell(c, shell, name))
214 errx(1, "expecting additional argument%s after \"%s\"",
215 (nargs - argc) ? "s" : "", argv[argc - 1]);
224 * Execute a shell command using passed use_shell and use_name
228 exec_shell(const char *command, char *use_shell, char *use_name)
232 sig_t intsave, quitsave;
234 if (!command) /* just checking... */
237 omask = sigblock(sigmask(SIGCHLD));
238 switch(pid = vfork()) {
242 (void)sigsetmask(omask);
243 execl(use_shell, use_name, "-c", command, (char *)NULL);
244 warn("%s", use_shell);
247 intsave = signal(SIGINT, SIG_IGN);
248 quitsave = signal(SIGQUIT, SIG_IGN);
249 pid = waitpid(pid, &pstat, 0);
250 (void)sigsetmask(omask);
251 (void)signal(SIGINT, intsave);
252 (void)signal(SIGQUIT, quitsave);
253 return(pid == -1 ? -1 : pstat);
260 (void)fprintf(stderr,
261 "usage: apply [-a magic] [-d] [-0123456789] command arguments ...\n");