filter: add interface layer

[cgit.git] / filter.c

diff --git a/filter.c b/filter.c
index d8c0116df39bd20a96f183b4e992b969afdb7623..0f3edb00e96eaca6464c3b212145f41825b05d02 100644 (file)
--- a/filter.c
+++ b/filter.c
@@ -13,15 +13,13 @@
 #include <string.h>
 #include <stdlib.h>
 
 #include <string.h>
 #include <stdlib.h>
 

-int cgit_open_filter(struct cgit_filter *filter, ...)
+static int open_exec_filter(struct cgit_filter *base, va_list ap)

 {
 {

+       struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;

        int i;
        int i;

-       va_list ap;

 
 

-       va_start(ap, filter);

        for (i = 0; i < filter->extra_args; i++)
                filter->argv[i+1] = va_arg(ap, char *);
        for (i = 0; i < filter->extra_args; i++)
                filter->argv[i+1] = va_arg(ap, char *);

-       va_end(ap);

 
        filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
                "Unable to duplicate STDOUT");
 
        filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
                "Unable to duplicate STDOUT");


@@ -41,9 +39,9 @@ int cgit_open_filter(struct cgit_filter *filter, ...)
        return 0;
 }
 
        return 0;
 }
 

-
-int cgit_close_filter(struct cgit_filter *filter)
+static int close_exec_filter(struct cgit_filter *base)

 {
 {

+       struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;

        int i, exit_status;
 
        chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
        int i, exit_status;
 
        chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),


@@ -63,16 +61,50 @@ done:
 
 }
 
 
 }
 

-struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
+static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)

 {
 {

-       struct cgit_filter *f;
-       int args_size = 0;
+       struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
+       fprintf(f, "%s%s\n", prefix, filter->cmd);
+}

 
 

-       if (!cmd || !cmd[0])
-               return NULL;
+int cgit_open_filter(struct cgit_filter *filter, ...)
+{
+       int result;
+       va_list ap;
+       va_start(ap, filter);
+       result = filter->open(filter, ap);
+       va_end(ap);
+       return result;
+}

 
 

-       f = xmalloc(sizeof(struct cgit_filter));
-       memset(f, 0, sizeof(struct cgit_filter));
+int cgit_close_filter(struct cgit_filter *filter)
+{
+       return filter->close(filter);
+}
+
+void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix)
+{
+       filter->fprintf(filter, f, prefix);
+}
+
+void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
+{
+       memset(filter, 0, sizeof(*filter));
+       filter->base.open = open_exec_filter;
+       filter->base.close = close_exec_filter;
+       filter->base.fprintf = fprintf_exec_filter;
+       filter->cmd = cmd;
+       filter->argv = argv;
+}
+
+static struct cgit_filter *new_exec_filter(const char *cmd, filter_type filtertype)
+{
+       struct cgit_exec_filter *f;
+       int args_size = 0;
+
+       f = xmalloc(sizeof(*f));
+       /* We leave argv for now and assign it below. */
+       cgit_exec_filter_init(f, xstrdup(cmd), NULL);

 
        switch (filtertype) {
                case SOURCE:
 
        switch (filtertype) {
                case SOURCE:


@@ -86,10 +118,17 @@ struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
                        break;
        }
 
                        break;
        }
 

-       f->cmd = xstrdup(cmd);

        args_size = (2 + f->extra_args) * sizeof(char *);
        f->argv = xmalloc(args_size);
        memset(f->argv, 0, args_size);
        f->argv[0] = f->cmd;
        args_size = (2 + f->extra_args) * sizeof(char *);
        f->argv = xmalloc(args_size);
        memset(f->argv, 0, args_size);
        f->argv[0] = f->cmd;

-       return f;
+       return &f->base;
+}
+
+struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
+{
+       if (!cmd || !cmd[0])
+               return NULL;
+
+       return new_exec_filter(cmd, filtertype);

 }
 }