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filter: don't use dlsym unnecessarily

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We only need to hook write() if Lua filter's are in use.  If support has
been disabled, remove the dependency on dlsym().

Signed-off-by: John Keeping <john@keeping.me.uk>
This commit is contained in:
John Keeping 2015-08-13 12:14:20 +01:00 committed by Jason A. Donenfeld
parent 7105a78b17
commit 0c4d76755b
1 changed files with 42 additions and 36 deletions
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78
filter.c
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@ -8,17 +8,13 @@
#include "cgit.h"
#include "html.h"
#include <dlfcn.h>
#ifndef NO_LUA
#include <dlfcn.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#endif
static ssize_t (*libc_write)(int fd, const void *buf, size_t count);
static ssize_t (*filter_write)(struct cgit_filter *base, const void *buf, size_t count) = NULL;
static struct cgit_filter *current_write_filter = NULL;
static inline void reap_filter(struct cgit_filter *filter)
{
if (filter && filter->cleanup)
@ -43,37 +39,6 @@ void cgit_cleanup_filters(void)
}
}
void cgit_init_filters(void)
{
libc_write = dlsym(RTLD_NEXT, "write");
if (!libc_write)
die("Could not locate libc's write function");
}
ssize_t write(int fd, const void *buf, size_t count)
{
if (fd != STDOUT_FILENO || !filter_write)
return libc_write(fd, buf, count);
return filter_write(current_write_filter, buf, count);
}
static inline void hook_write(struct cgit_filter *filter, ssize_t (*new_write)(struct cgit_filter *base, const void *buf, size_t count))
{
/* We want to avoid buggy nested patterns. */
assert(filter_write == NULL);
assert(current_write_filter == NULL);
current_write_filter = filter;
filter_write = new_write;
}
static inline void unhook_write(void)
{
assert(filter_write != NULL);
assert(current_write_filter != NULL);
filter_write = NULL;
current_write_filter = NULL;
}
static int open_exec_filter(struct cgit_filter *base, va_list ap)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
@ -170,7 +135,48 @@ void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **ar
filter->base.argument_count = 0;
}
#ifdef NO_LUA
void cgit_init_filters(void)
{
}
#endif
#ifndef NO_LUA
static ssize_t (*libc_write)(int fd, const void *buf, size_t count);
static ssize_t (*filter_write)(struct cgit_filter *base, const void *buf, size_t count) = NULL;
static struct cgit_filter *current_write_filter = NULL;
void cgit_init_filters(void)
{
libc_write = dlsym(RTLD_NEXT, "write");
if (!libc_write)
die("Could not locate libc's write function");
}
ssize_t write(int fd, const void *buf, size_t count)
{
if (fd != STDOUT_FILENO || !filter_write)
return libc_write(fd, buf, count);
return filter_write(current_write_filter, buf, count);
}
static inline void hook_write(struct cgit_filter *filter, ssize_t (*new_write)(struct cgit_filter *base, const void *buf, size_t count))
{
/* We want to avoid buggy nested patterns. */
assert(filter_write == NULL);
assert(current_write_filter == NULL);
current_write_filter = filter;
filter_write = new_write;
}
static inline void unhook_write(void)
{
assert(filter_write != NULL);
assert(current_write_filter != NULL);
filter_write = NULL;
current_write_filter = NULL;
}
struct lua_filter {
struct cgit_filter base;
char *script_file;