From 8a10aa570d084f3f417b24f37bf547ac92de611d Mon Sep 17 00:00:00 2001 From: "C. McEnroe" Date: Wed, 20 Jan 2021 13:33:37 -0500 Subject: Remove Lua support Lua support is unused and the dlsym fwrite/write hacks horrify me. Clean it up. --- www/git.causal.agency/cgit/filter.c | 255 ------------------------------------ 1 file changed, 255 deletions(-) (limited to 'www/git.causal.agency/cgit/filter.c') diff --git a/www/git.causal.agency/cgit/filter.c b/www/git.causal.agency/cgit/filter.c index fba26aa0..2b6c838e 100644 --- a/www/git.causal.agency/cgit/filter.c +++ b/www/git.causal.agency/cgit/filter.c @@ -8,12 +8,6 @@ #include "cgit.h" #include "html.h" -#ifndef NO_LUA -#include -#include -#include -#include -#endif static inline void reap_filter(struct cgit_filter *filter) { @@ -138,252 +132,6 @@ 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 size_t (*libc_fwrite)(const void *buf, size_t size, size_t n, FILE *); -static ssize_t (*libc_write)(int fd, const void *buf, size_t size); -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) -{ - /* - * we need to wrap both functions since the Lua filter may - * have code which calls write(2) directly, bypassing fwrite(3) - */ - libc_fwrite = dlsym(RTLD_NEXT, "fwrite"); - if (!libc_fwrite) - die("Could not locate libc's write function"); - libc_write = dlsym(RTLD_NEXT, "write"); - if (!libc_write) - die("Could not locate libc's write function"); -} - -size_t fwrite(const void *buf, size_t size, size_t n, FILE *f) -{ - if (f != stdout || !filter_write) - return libc_fwrite(buf, size, n, f); - return filter_write(current_write_filter, buf, size * n); -} - -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; - lua_State *lua_state; -}; - -static void error_lua_filter(struct lua_filter *filter) -{ - die("Lua error in %s: %s", filter->script_file, lua_tostring(filter->lua_state, -1)); - lua_pop(filter->lua_state, 1); -} - -static ssize_t write_lua_filter(struct cgit_filter *base, const void *buf, size_t count) -{ - struct lua_filter *filter = (struct lua_filter *)base; - - lua_getglobal(filter->lua_state, "filter_write"); - lua_pushlstring(filter->lua_state, buf, count); - if (lua_pcall(filter->lua_state, 1, 0, 0)) { - error_lua_filter(filter); - errno = EIO; - return -1; - } - return count; -} - -static inline int hook_lua_filter(lua_State *lua_state, void (*fn)(const char *txt)) -{ - const char *str; - ssize_t (*save_filter_write)(struct cgit_filter *base, const void *buf, size_t count); - struct cgit_filter *save_filter; - - str = lua_tostring(lua_state, 1); - if (!str) - return 0; - - save_filter_write = filter_write; - save_filter = current_write_filter; - unhook_write(); - fn(str); - hook_write(save_filter, save_filter_write); - - return 0; -} - -static int html_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, html); -} - -static int html_txt_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, html_txt); -} - -static int html_attr_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, html_attr); -} - -static int html_url_path_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, html_url_path); -} - -static int html_url_arg_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, html_url_arg); -} - -static int html_include_lua_filter(lua_State *lua_state) -{ - return hook_lua_filter(lua_state, (void (*)(const char *))html_include); -} - -static void cleanup_lua_filter(struct cgit_filter *base) -{ - struct lua_filter *filter = (struct lua_filter *)base; - - if (!filter->lua_state) - return; - - lua_close(filter->lua_state); - filter->lua_state = NULL; - if (filter->script_file) { - free(filter->script_file); - filter->script_file = NULL; - } -} - -static int init_lua_filter(struct lua_filter *filter) -{ - if (filter->lua_state) - return 0; - - if (!(filter->lua_state = luaL_newstate())) - return 1; - - luaL_openlibs(filter->lua_state); - - lua_pushcfunction(filter->lua_state, html_lua_filter); - lua_setglobal(filter->lua_state, "html"); - lua_pushcfunction(filter->lua_state, html_txt_lua_filter); - lua_setglobal(filter->lua_state, "html_txt"); - lua_pushcfunction(filter->lua_state, html_attr_lua_filter); - lua_setglobal(filter->lua_state, "html_attr"); - lua_pushcfunction(filter->lua_state, html_url_path_lua_filter); - lua_setglobal(filter->lua_state, "html_url_path"); - lua_pushcfunction(filter->lua_state, html_url_arg_lua_filter); - lua_setglobal(filter->lua_state, "html_url_arg"); - lua_pushcfunction(filter->lua_state, html_include_lua_filter); - lua_setglobal(filter->lua_state, "html_include"); - - if (luaL_dofile(filter->lua_state, filter->script_file)) { - error_lua_filter(filter); - lua_close(filter->lua_state); - filter->lua_state = NULL; - return 1; - } - return 0; -} - -static int open_lua_filter(struct cgit_filter *base, va_list ap) -{ - struct lua_filter *filter = (struct lua_filter *)base; - int i; - - if (fflush(stdout)) - return 1; - - if (init_lua_filter(filter)) - return 1; - - hook_write(base, write_lua_filter); - - lua_getglobal(filter->lua_state, "filter_open"); - for (i = 0; i < filter->base.argument_count; ++i) - lua_pushstring(filter->lua_state, va_arg(ap, char *)); - if (lua_pcall(filter->lua_state, filter->base.argument_count, 0, 0)) { - error_lua_filter(filter); - return 1; - } - return 0; -} - -static int close_lua_filter(struct cgit_filter *base) -{ - struct lua_filter *filter = (struct lua_filter *)base; - int ret = 0; - - lua_getglobal(filter->lua_state, "filter_close"); - if (lua_pcall(filter->lua_state, 0, 1, 0)) { - error_lua_filter(filter); - ret = -1; - } else { - ret = lua_tonumber(filter->lua_state, -1); - lua_pop(filter->lua_state, 1); - } - - unhook_write(); - return ret; -} - -static void fprintf_lua_filter(struct cgit_filter *base, FILE *f, const char *prefix) -{ - struct lua_filter *filter = (struct lua_filter *)base; - fprintf(f, "%slua:%s\n", prefix, filter->script_file); -} - - -static struct cgit_filter *new_lua_filter(const char *cmd, int argument_count) -{ - struct lua_filter *filter; - - filter = xmalloc(sizeof(*filter)); - memset(filter, 0, sizeof(*filter)); - filter->base.open = open_lua_filter; - filter->base.close = close_lua_filter; - filter->base.fprintf = fprintf_lua_filter; - filter->base.cleanup = cleanup_lua_filter; - filter->base.argument_count = argument_count; - filter->script_file = xstrdup(cmd); - - return &filter->base; -} - -#endif - - int cgit_open_filter(struct cgit_filter *filter, ...) { int result; @@ -415,9 +163,6 @@ static const struct { struct cgit_filter *(*ctor)(const char *cmd, int argument_count); } filter_specs[] = { { "exec", new_exec_filter }, -#ifndef NO_LUA - { "lua", new_lua_filter }, -#endif }; struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype) -- cgit 1.4.1