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-rw-r--r--filter.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/filter.c b/filter.c
new file mode 100644
index 0000000..f4ee9ac
--- /dev/null
+++ b/filter.c
@@ -0,0 +1,82 @@
+/* filter.c: filter framework functions
+ *
+ * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
+ *
+ * Licensed under GNU General Public License v2
+ * (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+
+int cgit_open_filter(struct cgit_filter *filter)
+{
+ filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
+ "Unable to duplicate STDOUT");
+ chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
+ filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
+ if (filter->pid == 0) {
+ close(filter->pipe_fh[1]);
+ chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
+ "Unable to use pipe as STDIN");
+ execvp(filter->cmd, filter->argv);
+ die_errno("Unable to exec subprocess %s", filter->cmd);
+ }
+ close(filter->pipe_fh[0]);
+ chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
+ "Unable to use pipe as STDOUT");
+ close(filter->pipe_fh[1]);
+ return 0;
+}
+
+
+int cgit_close_filter(struct cgit_filter *filter)
+{
+ int exit_status;
+
+ chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
+ "Unable to restore STDOUT");
+ close(filter->old_stdout);
+ if (filter->pid < 0)
+ return 0;
+ waitpid(filter->pid, &exit_status, 0);
+ if (WIFEXITED(exit_status) && !WEXITSTATUS(exit_status))
+ return 0;
+ die("Subprocess %s exited abnormally", filter->cmd);
+}
+
+struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
+{
+ struct cgit_filter *f;
+ int args_size = 0;
+ int extra_args;
+
+ if (!cmd || !cmd[0])
+ return NULL;
+
+ switch (filtertype) {
+ case SOURCE:
+ case ABOUT:
+ extra_args = 1;
+ break;
+
+ case COMMIT:
+ default:
+ extra_args = 0;
+ break;
+ }
+
+ f = xmalloc(sizeof(struct cgit_filter));
+ memset(f, 0, sizeof(struct cgit_filter));
+
+ f->cmd = xstrdup(cmd);
+ args_size = (2 + extra_args) * sizeof(char *);
+ f->argv = xmalloc(args_size);
+ memset(f->argv, 0, args_size);
+ f->argv[0] = f->cmd;
+ return f;
+}