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38 static const char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
52 void usage __P((void));
53 int system __P((const char *));
60 int ch, clen, debug, i, l, magic, n, nargs, rval;
61 char *c, *cmd, *p, *q;
64 magic = '%'; /* Default magic char is `%'. */
66 while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
69 if (optarg[1] != '\0')
71 "illegal magic character specification.");
77 case '0': case '1': case '2': case '3': case '4':
78 case '5': case '6': case '7': case '8': case '9':
81 "only one -# argument may be specified.");
94 * The command to run is argv[0], and the args are argv[1..].
95 * Look for %digit references in the command, remembering the
98 for (n = 0, p = argv[0]; *p != '\0'; ++p)
99 if (p[0] == magic && isdigit(p[1]) && p[1] != '0') {
106 * If there were any %digit references, then use those, otherwise
107 * build a new command string with sufficient %digit references at
108 * the end to consume (nargs) arguments each time round the loop.
109 * Allocate enough space to hold the maximum command.
111 if ((cmd = malloc(sizeof("exec ") - 1 +
112 strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
116 /* If nargs not set, default to a single argument. */
121 p += sprintf(cmd, "exec %s", argv[0]);
122 for (i = 1; i <= nargs; i++)
123 p += sprintf(p, " %c%d", magic, i);
126 * If nargs set to the special value 0, eat a single
127 * argument for each command execution.
132 (void)sprintf(cmd, "exec %s", argv[0]);
137 * Grab some space in which to build the command. Allocate
138 * as necessary later, but no reason to build it up slowly
139 * for the normal case.
141 if ((c = malloc(clen = 1024)) == NULL)
145 * (argc) and (argv) are still offset by one to make it simpler to
146 * expand %digit references. At the end of the loop check for (argc)
147 * equals 1 means that all the (argv) has been consumed.
149 for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
151 * Find a max value for the command length, and ensure
152 * there's enough space to build it.
154 for (l = strlen(cmd), i = 0; i < nargs; i++)
155 l += strlen(argv[i]);
156 if (l > clen && (c = realloc(c, clen = l)) == NULL)
159 /* Expand command argv references. */
160 for (p = cmd, q = c; *p != '\0'; ++p)
161 if (p[0] == magic && isdigit(p[1]) && p[1] != '0')
162 q += sprintf(q, "%s", argv[(++p)[0] - '0']);
166 /* Terminate the command string. */
169 /* Run the command. */
171 (void)printf("%s\n", c);
178 errx(1, "expecting additional argument%s after \"%s\"",
179 (nargs - argc) ? "s" : "", argv[argc - 1]);
185 * Private version of system(3). Use the user's SHELL environment
186 * variable as the shell to execute.
192 static char *name, *shell;
195 sig_t intsave, quitsave;
198 if ((shell = getenv("SHELL")) == NULL)
199 shell = _PATH_BSHELL;
200 if ((name = strrchr(shell, '/')) == NULL)
205 if (!command) /* just checking... */
208 omask = sigblock(sigmask(SIGCHLD));
209 switch(pid = fork()) {
213 (void)sigsetmask(omask);
214 execl(shell, name, "-c", command, NULL);
217 intsave = signal(SIGINT, SIG_IGN);
218 quitsave = signal(SIGQUIT, SIG_IGN);
219 pid = waitpid(pid, &pstat, 0);
220 (void)sigsetmask(omask);
221 (void)signal(SIGINT, intsave);
222 (void)signal(SIGQUIT, quitsave);
223 return(pid == -1 ? -1 : pstat);
230 (void)fprintf(stderr,
231 "usage: apply [-a magic] [-0123456789] command arguments ...\n");