+ int so_size = 0, se_size = 0;
+ int so_fd[2], se_fd[2];
+ int pid, r, quit, i;
+ fd_set rset, rset2;
+ char buf[256];
+ char *p;
+
+ if (stdoutput) *stdoutput = NULL;
+ if (stderror) *stderror = NULL;
+
+ if (verbose) {
+ printf ("%s", argv[0]);
+ for (i = 1; argv[i] != NULL; ++i)
+ printf (" %s", argv[i]);
+ printf ("\n");
+ }
+
+ if (pipe (so_fd) == -1 || pipe (se_fd) == -1) {
+ perror ("pipe");
+ return -1;
+ }
+
+ pid = fork ();
+ if (pid == -1) {
+ perror ("fork");
+ close (so_fd[0]);
+ close (so_fd[1]);
+ close (se_fd[0]);
+ close (se_fd[1]);
+ return -1;
+ }
+
+ if (pid == 0) { /* Child process. */
+ close (0);
+ close (so_fd[0]);
+ close (se_fd[0]);
+ dup2 (so_fd[1], 1);
+ dup2 (se_fd[1], 2);
+ close (so_fd[1]);
+ close (se_fd[1]);
+
+ execvp (argv[0], argv);
+ perror (argv[0]);
+ _exit (1);
+ }
+
+ /* Parent process. */
+ close (so_fd[1]);
+ close (se_fd[1]);
+
+ FD_ZERO (&rset);
+ FD_SET (so_fd[0], &rset);
+ FD_SET (se_fd[0], &rset);
+
+ quit = 0;
+ while (quit < 2) {
+ rset2 = rset;
+ r = select (MAX (so_fd[0], se_fd[0]) + 1, &rset2, NULL, NULL, NULL);
+ if (r == -1) {
+ perror ("select");
+ quit:
+ if (stdoutput) free (*stdoutput);
+ if (stderror) free (*stderror);
+ close (so_fd[0]);
+ close (se_fd[0]);
+ waitpid (pid, NULL, 0);
+ return -1;
+ }
+
+ if (FD_ISSET (so_fd[0], &rset2)) { /* something on stdout */
+ r = read (so_fd[0], buf, sizeof buf);
+ if (r == -1) {
+ perror ("read");
+ goto quit;
+ }
+ if (r == 0) { FD_CLR (so_fd[0], &rset); quit++; }
+
+ if (r > 0 && stdoutput) {
+ so_size += r;
+ p = realloc (*stdoutput, so_size);
+ if (p == NULL) {
+ perror ("realloc");
+ goto quit;
+ }
+ *stdoutput = p;
+ memcpy (*stdoutput + so_size - r, buf, r);
+ }
+ }
+
+ if (FD_ISSET (se_fd[0], &rset2)) { /* something on stderr */
+ r = read (se_fd[0], buf, sizeof buf);
+ if (r == -1) {
+ perror ("read");
+ goto quit;
+ }
+ if (r == 0) { FD_CLR (se_fd[0], &rset); quit++; }
+
+ if (r > 0 && stderror) {
+ se_size += r;
+ p = realloc (*stderror, se_size);
+ if (p == NULL) {
+ perror ("realloc");
+ goto quit;
+ }
+ *stderror = p;
+ memcpy (*stderror + se_size - r, buf, r);
+ }
+ }
+ }
+
+ close (so_fd[0]);
+ close (se_fd[0]);
+
+ /* Make sure the output buffers are \0-terminated. Also remove any
+ * trailing \n characters from the error buffer (not from stdout).
+ */
+ if (stdoutput) {
+ *stdoutput = realloc (*stdoutput, so_size+1);
+ if (*stdoutput == NULL) {
+ perror ("realloc");
+ *stdoutput = NULL;
+ } else
+ (*stdoutput)[so_size] = '\0';
+ }
+ if (stderror) {
+ *stderror = realloc (*stderror, se_size+1);
+ if (*stderror == NULL) {
+ perror ("realloc");
+ *stderror = NULL;
+ } else {
+ (*stderror)[se_size] = '\0';
+ se_size--;
+ while (se_size >= 0 && (*stderror)[se_size] == '\n')
+ (*stderror)[se_size--] = '\0';
+ }
+ }
+
+ /* Get the exit status of the command. */
+ waitpid (pid, &r, 0);
+
+ if (WIFEXITED (r)) {
+ return WEXITSTATUS (r);
+ } else
+ return -1;
+}
+
+/* Split an output string into a NULL-terminated list of lines.
+ * Typically this is used where we have run an external command
+ * which has printed out a list of things, and we want to return
+ * an actual list.
+ *
+ * The corner cases here are quite tricky. Note in particular:
+ *
+ * "" -> []
+ * "\n" -> [""]
+ * "a\nb" -> ["a"; "b"]
+ * "a\nb\n" -> ["a"; "b"]
+ * "a\nb\n\n" -> ["a"; "b"; ""]
+ *
+ * The original string is written over and destroyed by this
+ * function (which is usually OK because it's the 'out' string
+ * from command()). You can free the original string, because
+ * add_string() strdups the strings.
+ */
+char **
+split_lines (char *str)
+{
+ char **lines = NULL;
+ int size = 0, alloc = 0;
+ char *p, *pend;
+
+ if (strcmp (str, "") == 0)
+ goto empty_list;
+
+ p = str;
+ while (p) {
+ /* Empty last line? */
+ if (p[0] == '\0')
+ break;
+
+ pend = strchr (p, '\n');
+ if (pend) {
+ *pend = '\0';
+ pend++;
+ }
+
+ if (add_string (&lines, &size, &alloc, p) == -1) {
+ return NULL;
+ }
+
+ p = pend;
+ }
+
+ empty_list:
+ if (add_string (&lines, &size, &alloc, NULL) == -1)
+ return NULL;
+
+ return lines;
+}
+
+/* Quote 'in' for the shell, and write max len-1 bytes to out. The
+ * result will be NUL-terminated, even if it is truncated.
+ *
+ * Returns number of bytes needed, so if result >= len then the buffer
+ * should have been longer.
+ *
+ * XXX This doesn't quote \n correctly (but is still safe).
+ */
+int
+shell_quote (char *out, int len, const char *in)
+{
+#define SAFE(c) (isalnum((c)) || \
+ (c) == '/' || (c) == '-' || (c) == '_' || (c) == '.')
+ int i, j;
+ int outlen = strlen (in);
+
+ /* Calculate how much output space this really needs. */
+ for (i = 0; in[i]; ++i)
+ if (!SAFE (in[i])) outlen++;
+
+ /* Now copy the string, but only up to len-1 bytes. */
+ for (i = 0, j = 0; in[i]; ++i) {
+ int is_safe = SAFE (in[i]);
+
+ /* Enough space left to write this character? */
+ if (j >= len-1 || (!is_safe && j >= len-2))
+ break;
+
+ if (!is_safe) out[j++] = '\\';
+ out[j++] = in[i];
+ }
+
+ out[j] = '\0';
+
+ return outlen;