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-rwxr-xr-xplugins/zyklonb/script2310
1 files changed, 0 insertions, 2310 deletions
diff --git a/plugins/zyklonb/script b/plugins/zyklonb/script
deleted file mode 100755
index c19b8c5..0000000
--- a/plugins/zyklonb/script
+++ /dev/null
@@ -1,2310 +0,0 @@
-#!/usr/bin/tcc -run -lm
-//
-// ZyklonB scripting plugin, using a custom stack-based language
-//
-// Copyright 2014 Přemysl Eric Janouch
-// See the file LICENSE for licensing information.
-//
-// Just compile this file as usual (sans #!) if you don't feel like using TCC.
-// It is a very basic and portable C99 application. It's not supposed to be
-// very sophisticated, for it'd get extremely big.
-//
-// The main influences of the language were Factor and Joy, stripped of all
-// even barely complex stuff. In its current state, it's only really useful as
-// a calculator but it's got great potential for extending.
-//
-// If you don't like something, just change it; this is just an experiment.
-//
-// NOTE: it is relatively easy to abuse. Be careful.
-//
-
-#define _XOPEN_SOURCE 500
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <time.h>
-#include <stdbool.h>
-#include <strings.h>
-#include <math.h>
-
-#define ADDRESS_SPACE_LIMIT (100 * 1024 * 1024)
-#include <sys/resource.h>
-
-#if defined __GNUC__
-#define ATTRIBUTE_PRINTF(x, y) __attribute__ ((format (printf, x, y)))
-#else // ! __GNUC__
-#define ATTRIBUTE_PRINTF(x, y)
-#endif // ! __GNUC__
-
-#define N_ELEMENTS(a) (sizeof (a) / sizeof ((a)[0]))
-
-// --- Utilities ---------------------------------------------------------------
-
-static char *strdup_printf (const char *format, ...) ATTRIBUTE_PRINTF (1, 2);
-
-static char *
-strdup_vprintf (const char *format, va_list ap)
-{
- va_list aq;
- va_copy (aq, ap);
- int size = vsnprintf (NULL, 0, format, aq);
- va_end (aq);
- if (size < 0)
- return NULL;
-
- char buf[size + 1];
- size = vsnprintf (buf, sizeof buf, format, ap);
- if (size < 0)
- return NULL;
-
- return strdup (buf);
-}
-
-static char *
-strdup_printf (const char *format, ...)
-{
- va_list ap;
- va_start (ap, format);
- char *result = strdup_vprintf (format, ap);
- va_end (ap);
- return result;
-}
-
-// --- Generic buffer ----------------------------------------------------------
-
-struct buffer
-{
- char *s; ///< Buffer data
- size_t alloc; ///< Number of bytes allocated
- size_t len; ///< Number of bytes used
- bool memory_failure; ///< Memory allocation failed
-};
-
-#define BUFFER_INITIALIZER { NULL, 0, 0, false }
-
-static bool
-buffer_append (struct buffer *self, const void *s, size_t n)
-{
- if (self->memory_failure)
- return false;
-
- if (!self->s)
- self->s = malloc (self->alloc = 8);
- while (self->len + n > self->alloc)
- self->s = realloc (self->s, self->alloc <<= 1);
-
- if (!self->s)
- {
- self->memory_failure = true;
- return false;
- }
-
- memcpy (self->s + self->len, s, n);
- self->len += n;
- return true;
-}
-
-inline static bool
-buffer_append_c (struct buffer *self, char c)
-{
- return buffer_append (self, &c, 1);
-}
-
-// --- Data types --------------------------------------------------------------
-
-enum item_type
-{
- ITEM_STRING,
- ITEM_WORD,
- ITEM_INTEGER,
- ITEM_FLOAT,
- ITEM_LIST
-};
-
-struct item
-{
-#define ITEM_HEADER \
- enum item_type type; /**< The type of this object */ \
- struct item *next; /**< Next item on the list/stack */
-
- ITEM_HEADER
-};
-
-struct item_string
-{
- ITEM_HEADER
- size_t len; ///< Length of the string (sans '\0')
- char value[]; ///< The null-terminated string value
-};
-
-#define get_string(item) \
- (assert ((item)->type == ITEM_STRING), \
- ((struct item_string *)(item))->value)
-
-/// It looks like a string but it doesn't quack like a string
-#define item_word item_string
-
-#define get_word(item) \
- (assert ((item)->type == ITEM_WORD), \
- ((struct item_word *)(item))->value)
-
-struct item_integer
-{
- ITEM_HEADER
- long long value; ///< The integer value
-};
-
-#define get_integer(item) \
- (assert ((item)->type == ITEM_INTEGER), \
- ((struct item_integer *)(item))->value)
-
-struct item_float
-{
- ITEM_HEADER
- long double value; ///< The floating point value
-};
-
-#define get_float(item) \
- (assert ((item)->type == ITEM_FLOAT), \
- ((struct item_float *)(item))->value)
-
-struct item_list
-{
- ITEM_HEADER
- struct item *head; ///< The head of the list
-};
-
-#define get_list(item) \
- (assert ((item)->type == ITEM_LIST), \
- ((struct item_list *)(item))->head)
-
-#define set_list(item, head_) \
- (assert ((item)->type == ITEM_LIST), \
- item_free_list (((struct item_list *)(item))->head), \
- ((struct item_list *)(item))->head = (head_))
-
-const char *
-item_type_to_str (enum item_type type)
-{
- switch (type)
- {
- case ITEM_STRING: return "string";
- case ITEM_WORD: return "word";
- case ITEM_INTEGER: return "integer";
- case ITEM_FLOAT: return "float";
- case ITEM_LIST: return "list";
- }
- abort ();
-}
-
-// --- Item management ---------------------------------------------------------
-
-static void item_free_list (struct item *);
-static struct item *new_clone_list (const struct item *);
-
-static void
-item_free (struct item *item)
-{
- if (item->type == ITEM_LIST)
- item_free_list (get_list (item));
- free (item);
-}
-
-static void
-item_free_list (struct item *item)
-{
- while (item)
- {
- struct item *link = item;
- item = item->next;
- item_free (link);
- }
-}
-
-static struct item *
-new_clone (const struct item *item)
-{
- size_t size;
- switch (item->type)
- {
- case ITEM_STRING:
- case ITEM_WORD:
- {
- const struct item_string *x = (const struct item_string *) item;
- size = sizeof *x + x->len + 1;
- break;
- }
- case ITEM_INTEGER: size = sizeof (struct item_integer); break;
- case ITEM_FLOAT: size = sizeof (struct item_float); break;
- case ITEM_LIST: size = sizeof (struct item_list); break;
- }
-
- struct item *clone = malloc (size);
- if (!clone)
- return NULL;
-
- memcpy (clone, item, size);
- if (item->type == ITEM_LIST)
- {
- struct item_list *x = (struct item_list *) clone;
- if (x->head && !(x->head = new_clone_list (x->head)))
- {
- free (clone);
- return NULL;
- }
- }
- clone->next = NULL;
- return clone;
-}
-
-static struct item *
-new_clone_list (const struct item *item)
-{
- struct item *head = NULL, *clone;
- for (struct item **out = &head; item; item = item->next)
- {
- if (!(clone = *out = new_clone (item)))
- {
- item_free_list (head);
- return NULL;
- }
- clone->next = NULL;
- out = &clone->next;
- }
- return head;
-}
-
-static struct item *
-new_string (const char *s, ssize_t len)
-{
- if (len < 0)
- len = strlen (s);
-
- struct item_string *item = calloc (1, sizeof *item + len + 1);
- if (!item)
- return NULL;
-
- item->type = ITEM_STRING;
- item->len = len;
- memcpy (item->value, s, len);
- item->value[len] = '\0';
- return (struct item *) item;
-}
-
-static struct item *
-new_word (const char *s, ssize_t len)
-{
- struct item *item = new_string (s, len);
- if (!item)
- return NULL;
-
- item->type = ITEM_WORD;
- return item;
-}
-
-static struct item *
-new_integer (long long value)
-{
- struct item_integer *item = calloc (1, sizeof *item);
- if (!item)
- return NULL;
-
- item->type = ITEM_INTEGER;
- item->value = value;
- return (struct item *) item;
-}
-
-static struct item *
-new_float (long double value)
-{
- struct item_float *item = calloc (1, sizeof *item);
- if (!item)
- return NULL;
-
- item->type = ITEM_FLOAT;
- item->value = value;
- return (struct item *) item;
-}
-
-static struct item *
-new_list (struct item *head)
-{
- struct item_list *item = calloc (1, sizeof *item);
- if (!item)
- return NULL;
-
- item->type = ITEM_LIST;
- item->head = head;
- return (struct item *) item;
-}
-
-// --- Parsing -----------------------------------------------------------------
-
-#define PARSE_ERROR_TABLE(XX) \
- XX( OK, NULL ) \
- XX( EOF, "unexpected end of input" ) \
- XX( INVALID_HEXA_ESCAPE, "invalid hexadecimal escape sequence" ) \
- XX( INVALID_ESCAPE, "unrecognized escape sequence" ) \
- XX( MEMORY, "memory allocation failure" ) \
- XX( FLOAT_RANGE, "floating point value out of range" ) \
- XX( INTEGER_RANGE, "integer out of range" ) \
- XX( INVALID_INPUT, "invalid input" ) \
- XX( UNEXPECTED_INPUT, "unexpected input" )
-
-enum tokenizer_error
-{
-#define XX(x, y) PARSE_ERROR_ ## x,
- PARSE_ERROR_TABLE (XX)
-#undef XX
- PARSE_ERROR_COUNT
-};
-
-struct tokenizer
-{
- const char *cursor;
- enum tokenizer_error error;
-};
-
-static bool
-decode_hexa_escape (struct tokenizer *self, struct buffer *buf)
-{
- int i;
- char c, code = 0;
-
- for (i = 0; i < 2; i++)
- {
- c = tolower (*self->cursor);
- if (c >= '0' && c <= '9')
- code = (code << 4) | (c - '0');
- else if (c >= 'a' && c <= 'f')
- code = (code << 4) | (c - 'a' + 10);
- else
- break;
-
- self->cursor++;
- }
-
- if (!i)
- return false;
-
- buffer_append_c (buf, code);
- return true;
-}
-
-static bool
-decode_octal_escape (struct tokenizer *self, struct buffer *buf)
-{
- int i;
- char c, code = 0;
-
- for (i = 0; i < 3; i++)
- {
- c = *self->cursor;
- if (c < '0' || c > '7')
- break;
-
- code = (code << 3) | (c - '0');
- self->cursor++;
- }
-
- if (!i)
- return false;
-
- buffer_append_c (buf, code);
- return true;
-}
-
-static bool
-decode_escape_sequence (struct tokenizer *self, struct buffer *buf)
-{
- // Support some basic escape sequences from the C language
- char c;
- switch ((c = *self->cursor))
- {
- case '\0':
- self->error = PARSE_ERROR_EOF;
- return false;
- case 'x':
- case 'X':
- self->cursor++;
- if (decode_hexa_escape (self, buf))
- return true;
-
- self->error = PARSE_ERROR_INVALID_HEXA_ESCAPE;
- return false;
- default:
- if (decode_octal_escape (self, buf))
- return true;
-
- self->cursor++;
- const char *from = "abfnrtv\"\\", *to = "\a\b\f\n\r\t\v\"\\", *x;
- if ((x = strchr (from, c)))
- {
- buffer_append_c (buf, to[x - from]);
- return true;
- }
-
- self->error = PARSE_ERROR_INVALID_ESCAPE;
- return false;
- }
-}
-
-static struct item *
-parse_string (struct tokenizer *self)
-{
- struct buffer buf = BUFFER_INITIALIZER;
- struct item *item = NULL;
- char c;
-
- while (true)
- switch ((c = *self->cursor++))
- {
- case '\0':
- self->cursor--;
- self->error = PARSE_ERROR_EOF;
- goto end;
- case '"':
- if (buf.memory_failure
- || !(item = new_string (buf.s, buf.len)))
- self->error = PARSE_ERROR_MEMORY;
- goto end;
- case '\\':
- if (decode_escape_sequence (self, &buf))
- break;
- goto end;
- default:
- buffer_append_c (&buf, c);
- }
-
-end:
- free (buf.s);
- return item;
-}
-
-static struct item *
-try_parse_number (struct tokenizer *self)
-{
- // These two standard library functions can digest a lot of various inputs,
- // including NaN and +/- infinity. That may get a bit confusing.
- char *float_end;
- errno = 0;
- long double float_value = strtold (self->cursor, &float_end);
- int float_errno = errno;
-
- char *int_end;
- errno = 0;
- long long int_value = strtoll (self->cursor, &int_end, 10);
- int int_errno = errno;
-
- // If they both fail, then this is most probably not a number.
- if (float_end == int_end && float_end == self->cursor)
- return NULL;
-
- // Only use the floating point result if it parses more characters:
- struct item *item;
- if (float_end > int_end)
- {
- if (float_errno == ERANGE)
- {
- self->error = PARSE_ERROR_FLOAT_RANGE;
- return NULL;
- }
- self->cursor = float_end;
- if (!(item = new_float (float_value)))
- self->error = PARSE_ERROR_MEMORY;
- return item;
- }
- else
- {
- if (int_errno == ERANGE)
- {
- self->error = PARSE_ERROR_INTEGER_RANGE;
- return NULL;
- }
- self->cursor = int_end;
- if (!(item = new_integer (int_value)))
- self->error = PARSE_ERROR_MEMORY;
- return item;
- }
-}
-
-static struct item *
-parse_word (struct tokenizer *self)
-{
- struct buffer buf = BUFFER_INITIALIZER;
- struct item *item = NULL;
- char c;
-
- // Here we accept almost anything that doesn't break the grammar
- while (!strchr (" []\"", (c = *self->cursor++)) && (unsigned char) c > ' ')
- buffer_append_c (&buf, c);
- self->cursor--;
-
- if (buf.memory_failure)
- self->error = PARSE_ERROR_MEMORY;
- else if (!buf.len)
- self->error = PARSE_ERROR_INVALID_INPUT;
- else if (!(item = new_word (buf.s, buf.len)))
- self->error = PARSE_ERROR_MEMORY;
-
- free (buf.s);
- return item;
-}
-
-static struct item *parse_item_list (struct tokenizer *);
-
-static struct item *
-parse_list (struct tokenizer *self)
-{
- struct item *list = parse_item_list (self);
- if (self->error)
- {
- assert (list == NULL);
- return NULL;
- }
- if (!*self->cursor)
- {
- self->error = PARSE_ERROR_EOF;
- item_free_list (list);
- return NULL;
- }
- assert (*self->cursor == ']');
- self->cursor++;
- return new_list (list);
-}
-
-static struct item *
-parse_item (struct tokenizer *self)
-{
- char c;
- switch ((c = *self->cursor++))
- {
- case '[': return parse_list (self);
- case '"': return parse_string (self);
- default:;
- }
-
- self->cursor--;
- struct item *item = try_parse_number (self);
- if (!item && !self->error)
- item = parse_word (self);
- return item;
-}
-
-static struct item *
-parse_item_list (struct tokenizer *self)
-{
- struct item *head = NULL;
- struct item **tail = &head;
-
- char c;
- bool expected = true;
- while ((c = *self->cursor) && c != ']')
- {
- if (isspace (c))
- {
- self->cursor++;
- expected = true;
- continue;
- }
- else if (!expected)
- {
- self->error = PARSE_ERROR_UNEXPECTED_INPUT;
- goto fail;
- }
-
- if (!(*tail = parse_item (self)))
- goto fail;
- tail = &(*tail)->next;
- expected = false;
- }
- return head;
-
-fail:
- item_free_list (head);
- return NULL;
-}
-
-static struct item *
-parse (const char *s, const char **error)
-{
- struct tokenizer self = { .cursor = s, .error = PARSE_ERROR_OK };
- struct item *list = parse_item_list (&self);
- if (!self.error && *self.cursor != '\0')
- {
- self.error = PARSE_ERROR_UNEXPECTED_INPUT;
- item_free_list (list);
- list = NULL;
- }
-
-#define XX(x, y) y,
- static const char *strings[PARSE_ERROR_COUNT] =
- { PARSE_ERROR_TABLE (XX) };
-#undef XX
-
- static char error_buf[128];
- if (self.error && error)
- {
- snprintf (error_buf, sizeof error_buf, "at character %d: %s",
- (int) (self.cursor - s) + 1, strings[self.error]);
- *error = error_buf;
- }
- return list;
-}
-
-// --- Runtime -----------------------------------------------------------------
-
-// TODO: try to think of a _simple_ way to do preemptive multitasking
-
-struct context
-{
- struct item *stack; ///< The current top of the stack
- size_t stack_size; ///< Number of items on the stack
-
- size_t reduction_count; ///< # of function calls so far
- size_t reduction_limit; ///< The hard limit on function calls
-
- char *error; ///< Error information
- bool error_is_fatal; ///< Whether the error can be catched
- bool memory_failure; ///< Memory allocation failure
-
- void *user_data; ///< User data
-};
-
-/// Internal handler for a function
-typedef bool (*handler_fn) (struct context *);
-
-struct fn
-{
- struct fn *next; ///< The next link in the chain
-
- handler_fn handler; ///< Internal C handler, or NULL
- struct item *script; ///< Alternatively runtime code
- char name[]; ///< The name of the function
-};
-
-struct fn *g_functions; ///< Maps words to functions
-
-static void
-context_init (struct context *ctx)
-{
- ctx->stack = NULL;
- ctx->stack_size = 0;
-
- ctx->reduction_count = 0;
- ctx->reduction_limit = 2000;
-
- ctx->error = NULL;
- ctx->error_is_fatal = false;
- ctx->memory_failure = false;
-
- ctx->user_data = NULL;
-}
-
-static void
-context_free (struct context *ctx)
-{
- item_free_list (ctx->stack);
- ctx->stack = NULL;
-
- free (ctx->error);
- ctx->error = NULL;
-}
-
-static bool
-set_error (struct context *ctx, const char *format, ...)
-{
- free (ctx->error);
-
- va_list ap;
- va_start (ap, format);
- ctx->error = strdup_vprintf (format, ap);
- va_end (ap);
-
- if (!ctx->error)
- ctx->memory_failure = true;
- return false;
-}
-
-static bool
-push (struct context *ctx, struct item *item)
-{
- // The `item' is typically a result from new_<type>(), thus when it is null,
- // that function must have failed. This is a shortcut for convenience.
- if (!item)
- {
- ctx->memory_failure = true;
- return false;
- }
-
- assert (item->next == NULL);
- item->next = ctx->stack;
- ctx->stack = item;
- ctx->stack_size++;
- return true;
-}
-
-static bool
-bump_reductions (struct context *ctx)
-{
- if (++ctx->reduction_count >= ctx->reduction_limit)
- {
- ctx->error_is_fatal = true;
- return set_error (ctx, "reduction limit reached");
- }
- return true;
-}
-
-static bool execute (struct context *, struct item *);
-
-static bool
-call_function (struct context *ctx, const char *name)
-{
- struct fn *iter;
- for (iter = g_functions; iter; iter = iter->next)
- if (!strcmp (name, iter->name))
- goto found;
- return set_error (ctx, "unknown function: %s", name);
-
-found:
- if (!bump_reductions (ctx))
- return false;
-
- if (iter->handler
- ? iter->handler (ctx)
- : execute (ctx, iter->script))
- return true;
-
- // In this case, `error' is NULL
- if (ctx->memory_failure)
- return false;
-
- // This creates some form of a stack trace
- char *tmp = ctx->error;
- ctx->error = NULL;
- set_error (ctx, "%s -> %s", name, tmp);
- free (tmp);
- return false;
-}
-
-static void
-free_function (struct fn *fn)
-{
- item_free_list (fn->script);
- free (fn);
-}
-
-static void
-unregister_function (const char *name)
-{
- for (struct fn **iter = &g_functions; *iter; iter = &(*iter)->next)
- if (!strcmp ((*iter)->name, name))
- {
- struct fn *tmp = *iter;
- *iter = tmp->next;
- free_function (tmp);
- break;
- }
-}
-
-static struct fn *
-prepend_new_fn (const char *name)
-{
- struct fn *fn = calloc (1, sizeof *fn + strlen (name) + 1);
- if (!fn)
- return NULL;
-
- strcpy (fn->name, name);
- fn->next = g_functions;
- return g_functions = fn;
-}
-
-static bool
-register_handler (const char *name, handler_fn handler)
-{
- unregister_function (name);
- struct fn *fn = prepend_new_fn (name);
- if (!fn)
- return false;
- fn->handler = handler;
- return true;
-}
-
-static bool
-register_script (const char *name, struct item *script)
-{
- unregister_function (name);
- struct fn *fn = prepend_new_fn (name);
- if (!fn)
- return false;
- fn->script = script;
- return true;
-}
-
-static bool
-execute (struct context *ctx, struct item *script)
-{
- for (; script; script = script->next)
- {
- if (script->type != ITEM_WORD)
- {
- if (!bump_reductions (ctx)
- || !push (ctx, new_clone (script)))
- return false;
- }
- else if (!call_function (ctx, get_word (script)))
- return false;
- }
- return true;
-}
-
-// --- Runtime library ---------------------------------------------------------
-
-#define defn(name) static bool name (struct context *ctx)
-
-#define check_stack(n) \
- if (ctx->stack_size < n) { \
- set_error (ctx, "stack underflow"); \
- return 0; \
- }
-
-inline static bool
-check_stack_safe (struct context *ctx, size_t n)
-{
- check_stack (n);
- return true;
-}
-
-static bool
-check_type (struct context *ctx, const void *item_, enum item_type type)
-{
- const struct item *item = item_;
- if (item->type == type)
- return true;
-
- return set_error (ctx, "invalid type: expected `%s', got `%s'",
- item_type_to_str (type), item_type_to_str (item->type));
-}
-
-static struct item *
-pop (struct context *ctx)
-{
- check_stack (1);
- struct item *top = ctx->stack;
- ctx->stack = top->next;
- top->next = NULL;
- ctx->stack_size--;
- return top;
-}
-
-// - - Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-#define defn_is_type(name, item_type) \
- defn (fn_is_##name) { \
- check_stack (1); \
- struct item *top = pop (ctx); \
- push (ctx, new_integer (top->type == (item_type))); \
- item_free (top); \
- return true; \
- }
-
-defn_is_type (string, ITEM_STRING)
-defn_is_type (word, ITEM_WORD)
-defn_is_type (integer, ITEM_INTEGER)
-defn_is_type (float, ITEM_FLOAT)
-defn_is_type (list, ITEM_LIST)
-
-defn (fn_to_string)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- char *value;
-
- switch (item->type)
- {
- case ITEM_WORD:
- item->type = ITEM_STRING;
- case ITEM_STRING:
- return push (ctx, item);
-
- case ITEM_FLOAT:
- value = strdup_printf ("%Lf", get_float (item));
- break;
- case ITEM_INTEGER:
- value = strdup_printf ("%lld", get_integer (item));
- break;
-
- default:
- set_error (ctx, "cannot convert `%s' to `%s'",
- item_type_to_str (item->type), item_type_to_str (ITEM_STRING));
- item_free (item);
- return false;
- }
-
- item_free (item);
- if (!value)
- {
- ctx->memory_failure = true;
- return false;
- }
-
- item = new_string (value, -1);
- free (value);
- return push (ctx, item);
-}
-
-defn (fn_to_integer)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- long long value;
-
- switch (item->type)
- {
- case ITEM_INTEGER:
- return push (ctx, item);
- case ITEM_FLOAT:
- value = get_float (item);
- break;
-
- case ITEM_STRING:
- {
- char *end;
- const char *s = get_string (item);
- value = strtoll (s, &end, 10);
- if (end != s && *s == '\0')
- break;
-
- item_free (item);
- return set_error (ctx, "integer conversion error");
- }
-
- default:
- set_error (ctx, "cannot convert `%s' to `%s'",
- item_type_to_str (item->type), item_type_to_str (ITEM_INTEGER));
- item_free (item);
- return false;
- }
-
- item_free (item);
- return push (ctx, new_integer (value));
-}
-
-defn (fn_to_float)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- long double value;
-
- switch (item->type)
- {
- case ITEM_FLOAT:
- return push (ctx, item);
- case ITEM_INTEGER:
- value = get_integer (item);
- break;
-
- case ITEM_STRING:
- {
- char *end;
- const char *s = get_string (item);
- value = strtold (s, &end);
- if (end != s && *s == '\0')
- break;
-
- item_free (item);
- return set_error (ctx, "float conversion error");
- }
-
- default:
- set_error (ctx, "cannot convert `%s' to `%s'",
- item_type_to_str (item->type), item_type_to_str (ITEM_FLOAT));
- item_free (item);
- return false;
- }
-
- item_free (item);
- return push (ctx, new_float (value));
-}
-
-// - - Miscellaneous - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-defn (fn_length)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- bool success = true;
- switch (item->type)
- {
- case ITEM_STRING:
- success = push (ctx, new_integer (((struct item_string *) item)->len));
- break;
- case ITEM_LIST:
- {
- long long length = 0;
- struct item *iter;
- for (iter = get_list (item); iter; iter = iter->next)
- length++;
- success = push (ctx, new_integer (length));
- break;
- }
- default:
- success = set_error (ctx, "invalid type");
- }
- item_free (item);
- return success;
-}
-
-// - - Stack operations - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-defn (fn_dup)
-{
- check_stack (1);
- return push (ctx, new_clone (ctx->stack));
-}
-
-defn (fn_drop)
-{
- check_stack (1);
- item_free (pop (ctx));
- return true;
-}
-
-defn (fn_swap)
-{
- check_stack (2);
- struct item *second = pop (ctx), *first = pop (ctx);
- return push (ctx, second) && push (ctx, first);
-}
-
-defn (fn_call)
-{
- check_stack (1);
- struct item *script = pop (ctx);
- bool success = check_type (ctx, script, ITEM_LIST)
- && execute (ctx, get_list (script));
- item_free (script);
- return success;
-}
-
-defn (fn_dip)
-{
- check_stack (2);
- struct item *script = pop (ctx);
- struct item *item = pop (ctx);
- bool success = check_type (ctx, script, ITEM_LIST)
- && execute (ctx, get_list (script));
- item_free (script);
- if (!success)
- {
- item_free (item);
- return false;
- }
- return push (ctx, item);
-}
-
-defn (fn_unit)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- return push (ctx, new_list (item));
-}
-
-defn (fn_cons)
-{
- check_stack (2);
- struct item *list = pop (ctx);
- struct item *item = pop (ctx);
- if (!check_type (ctx, list, ITEM_LIST))
- {
- item_free (list);
- item_free (item);
- return false;
- }
- item->next = get_list (list);
- ((struct item_list *) list)->head = item;
- return push (ctx, list);
-}
-
-defn (fn_cat)
-{
- check_stack (2);
- struct item *scnd = pop (ctx);
- struct item *frst = pop (ctx);
- if (!check_type (ctx, frst, ITEM_LIST)
- || !check_type (ctx, scnd, ITEM_LIST))
- {
- item_free (frst);
- item_free (scnd);
- return false;
- }
-
- // XXX: we shouldn't have to do this in O(n)
- struct item **tail = &((struct item_list *) frst)->head;
- while (*tail)
- tail = &(*tail)->next;
- *tail = get_list (scnd);
-
- ((struct item_list *) scnd)->head = NULL;
- item_free (scnd);
- return push (ctx, frst);
-}
-
-defn (fn_uncons)
-{
- check_stack (1);
- struct item *list = pop (ctx);
- if (!check_type (ctx, list, ITEM_LIST))
- goto fail;
- struct item *first = get_list (list);
- if (!first)
- {
- set_error (ctx, "list is empty");
- goto fail;
- }
- ((struct item_list *) list)->head = first->next;
- first->next = NULL;
- return push (ctx, first) && push (ctx, list);
-fail:
- item_free (list);
- return false;
-}
-
-// - - Logical - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static bool
-to_boolean (struct context *ctx, struct item *item, bool *ok)
-{
- switch (item->type)
- {
- case ITEM_STRING:
- return *get_string (item) != '\0';
- case ITEM_INTEGER:
- return get_integer (item) != 0;
- case ITEM_FLOAT:
- return get_float (item) != 0.;
- default:
- return (*ok = set_error (ctx, "cannot convert `%s' to boolean",
- item_type_to_str (item->type)));
- }
-}
-
-defn (fn_not)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- bool ok = true;
- bool result = !to_boolean (ctx, item, &ok);
- item_free (item);
- return ok && push (ctx, new_integer (result));
-}
-
-defn (fn_and)
-{
- check_stack (2);
- struct item *op1 = pop (ctx);
- struct item *op2 = pop (ctx);
- bool ok = true;
- bool result = to_boolean (ctx, op1, &ok) && to_boolean (ctx, op2, &ok);
- item_free (op1);
- item_free (op2);
- return ok && push (ctx, new_integer (result));
-}
-
-defn (fn_or)
-{
- check_stack (2);
- struct item *op1 = pop (ctx);
- struct item *op2 = pop (ctx);
- bool ok = true;
- bool result = to_boolean (ctx, op1, &ok)
- || !ok || to_boolean (ctx, op2, &ok);
- item_free (op1);
- item_free (op2);
- return ok && push (ctx, new_integer (result));
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-defn (fn_if)
-{
- check_stack (3);
- struct item *else_ = pop (ctx);
- struct item *then_ = pop (ctx);
- struct item *cond_ = pop (ctx);
-
- bool ok = true;
- bool condition = to_boolean (ctx, cond_, &ok);
- item_free (cond_);
-
- bool success = false;
- if (ok
- && check_type (ctx, then_, ITEM_LIST)
- && check_type (ctx, else_, ITEM_LIST))
- success = execute (ctx, condition
- ? get_list (then_)
- : get_list (else_));
-
- item_free (then_);
- item_free (else_);
- return success;
-}
-
-defn (fn_try)
-{
- check_stack (2);
- struct item *catch = pop (ctx);
- struct item *try = pop (ctx);
- bool success = false;
- if (!check_type (ctx, try, ITEM_LIST)
- || !check_type (ctx, catch, ITEM_LIST))
- goto fail;
-
- if (!execute (ctx, get_list (try)))
- {
- if (ctx->memory_failure || ctx->error_is_fatal)
- goto fail;
-
- success = push (ctx, new_string (ctx->error, -1));
- free (ctx->error);
- ctx->error = NULL;
-
- if (success)
- success = execute (ctx, get_list (catch));
- }
-
-fail:
- item_free (try);
- item_free (catch);
- return success;
-}
-
-defn (fn_map)
-{
- check_stack (2);
- struct item *fn = pop (ctx);
- struct item *list = pop (ctx);
- if (!check_type (ctx, fn, ITEM_LIST)
- || !check_type (ctx, list, ITEM_LIST))
- {
- item_free (fn);
- item_free (list);
- return false;
- }
-
- bool success = false;
- struct item *result = NULL, **tail = &result;
- for (struct item *iter = get_list (list); iter; iter = iter->next)
- {
- if (!push (ctx, new_clone (iter))
- || !execute (ctx, get_list (fn))
- || !check_stack_safe (ctx, 1))
- goto fail;
-
- struct item *item = pop (ctx);
- *tail = item;
- tail = &item->next;
- }
- success = true;
-
-fail:
- set_list (list, result);
- item_free (fn);
- if (!success)
- {
- item_free (list);
- return false;
- }
- return push (ctx, list);
-}
-
-defn (fn_filter)
-{
- check_stack (2);
- struct item *fn = pop (ctx);
- struct item *list = pop (ctx);
- if (!check_type (ctx, fn, ITEM_LIST)
- || !check_type (ctx, list, ITEM_LIST))
- {
- item_free (fn);
- item_free (list);
- return false;
- }
-
- bool success = false;
- bool ok = true;
- struct item *result = NULL, **tail = &result;
- for (struct item *iter = get_list (list); iter; iter = iter->next)
- {
- if (!push (ctx, new_clone (iter))
- || !execute (ctx, get_list (fn))
- || !check_stack_safe (ctx, 1))
- goto fail;
-
- struct item *item = pop (ctx);
- bool survived = to_boolean (ctx, item, &ok);
- item_free (item);
- if (!ok)
- goto fail;
- if (!survived)
- continue;
-
- if (!(item = new_clone (iter)))
- goto fail;
- *tail = item;
- tail = &item->next;
- }
- success = true;
-
-fail:
- set_list (list, result);
- item_free (fn);
- if (!success)
- {
- item_free (list);
- return false;
- }
- return push (ctx, list);
-}
-
-defn (fn_fold)
-{
- check_stack (3);
- struct item *op = pop (ctx);
- struct item *null = pop (ctx);
- struct item *list = pop (ctx);
- bool success = false;
- if (!check_type (ctx, op, ITEM_LIST)
- || !check_type (ctx, list, ITEM_LIST))
- {
- item_free (null);
- goto fail;
- }
-
- push (ctx, null);
- for (struct item *iter = get_list (list); iter; iter = iter->next)
- if (!push (ctx, new_clone (iter))
- || !execute (ctx, get_list (op)))
- goto fail;
- success = true;
-
-fail:
- item_free (op);
- item_free (list);
- return success;
-}
-
-defn (fn_each)
-{
- check_stack (2);
- struct item *op = pop (ctx);
- struct item *list = pop (ctx);
- bool success = false;
- if (!check_type (ctx, op, ITEM_LIST)
- || !check_type (ctx, list, ITEM_LIST))
- goto fail;
-
- for (struct item *iter = get_list (list); iter; iter = iter->next)
- if (!push (ctx, new_clone (iter))
- || !execute (ctx, get_list (op)))
- goto fail;
- success = true;
-
-fail:
- item_free (op);
- item_free (list);
- return success;
-}
-
-// - - Arithmetic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// XXX: why not a `struct item_string *` argument?
-static bool
-push_repeated_string (struct context *ctx, struct item *op1, struct item *op2)
-{
- struct item_string *string = (struct item_string *) op1;
- struct item_integer *repeat = (struct item_integer *) op2;
- assert (string->type == ITEM_STRING);
- assert (repeat->type == ITEM_INTEGER);
-
- if (repeat->value < 0)
- return set_error (ctx, "cannot multiply a string by a negative value");
-
- char *buf = NULL;
- size_t len = string->len * repeat->value;
- if (len < string->len && repeat->value != 0)
- goto allocation_fail;
-
- buf = malloc (len);
- if (!buf)
- goto allocation_fail;
-
- for (size_t i = 0; i < len; i += string->len)
- memcpy (buf + i, string->value, string->len);
- struct item *item = new_string (buf, len);
- free (buf);
- return push (ctx, item);
-
-allocation_fail:
- ctx->memory_failure = true;
- return false;
-}
-
-defn (fn_times)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_integer (op1) * get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_integer (op1) * get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_float (op1) * get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (get_float (op1) * get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_STRING)
- ok = push_repeated_string (ctx, op2, op1);
- else if (op1->type == ITEM_STRING && op2->type == ITEM_INTEGER)
- ok = push_repeated_string (ctx, op1, op2);
- else
- ok = set_error (ctx, "cannot multiply `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-defn (fn_pow)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- // TODO: implement this properly, outputting an integer
- ok = push (ctx, new_float (powl (get_integer (op1), get_integer (op2))));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (powl (get_integer (op1), get_float (op2))));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (powl (get_float (op1), get_float (op2))));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (powl (get_float (op1), get_integer (op2))));
- else
- ok = set_error (ctx, "cannot exponentiate `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-defn (fn_div)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- {
- if (get_integer (op2) == 0)
- ok = set_error (ctx, "division by zero");
- else
- ok = push (ctx, new_integer (get_integer (op1) / get_integer (op2)));
- }
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_integer (op1) / get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_float (op1) / get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (get_float (op1) / get_integer (op2)));
- else
- ok = set_error (ctx, "cannot divide `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-defn (fn_mod)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- {
- if (get_integer (op2) == 0)
- ok = set_error (ctx, "division by zero");
- else
- ok = push (ctx, new_integer (get_integer (op1) % get_integer (op2)));
- }
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (fmodl (get_integer (op1), get_float (op2))));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (fmodl (get_float (op1), get_float (op2))));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (fmodl (get_float (op1), get_integer (op2))));
- else
- ok = set_error (ctx, "cannot divide `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-static bool
-push_concatenated_string (struct context *ctx,
- struct item *op1, struct item *op2)
-{
- struct item_string *s1 = (struct item_string *) op1;
- struct item_string *s2 = (struct item_string *) op2;
- assert (s1->type == ITEM_STRING);
- assert (s2->type == ITEM_STRING);
-
- char *buf = NULL;
- size_t len = s1->len + s2->len;
- if (len < s1->len || len < s2->len)
- goto allocation_fail;
-
- buf = malloc (len);
- if (!buf)
- goto allocation_fail;
-
- memcpy (buf, s1->value, s1->len);
- memcpy (buf + s1->len, s2->value, s2->len);
- struct item *item = new_string (buf, len);
- free (buf);
- return push (ctx, item);
-
-allocation_fail:
- ctx->memory_failure = true;
- return false;
-
-}
-
-defn (fn_plus)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_integer (op1) + get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_integer (op1) + get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_float (op1) + get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (get_float (op1) + get_integer (op2)));
- else if (op1->type == ITEM_STRING && op2->type == ITEM_STRING)
- ok = push_concatenated_string (ctx, op1, op2);
- else
- ok = set_error (ctx, "cannot add `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-defn (fn_minus)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_integer (op1) - get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_integer (op1) - get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_float (get_float (op1) - get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_float (get_float (op1) - get_integer (op2)));
- else
- ok = set_error (ctx, "cannot subtract `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-// - - Comparison - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static int
-compare_strings (struct item_string *s1, struct item_string *s2)
-{
- // XXX: not entirely correct wrt. null bytes
- size_t len = (s1->len < s2->len ? s1->len : s2->len) + 1;
- return memcmp (s1->value, s2->value, len);
-}
-
-static bool compare_lists (struct item *, struct item *);
-
-static bool
-compare_list_items (struct item *op1, struct item *op2)
-{
- if (op1->type != op2->type)
- return false;
-
- switch (op1->type)
- {
- case ITEM_STRING:
- case ITEM_WORD:
- return !compare_strings ((struct item_string *) op1,
- (struct item_string *) op2);
- case ITEM_FLOAT:
- return get_float (op1) == get_float (op2);
- case ITEM_INTEGER:
- return get_integer (op1) == get_integer (op2);
- case ITEM_LIST:
- return compare_lists (get_list (op1), get_list (op2));
- }
- abort ();
-}
-
-static bool
-compare_lists (struct item *op1, struct item *op2)
-{
- while (op1 && op2)
- {
- if (!compare_list_items (op1, op2))
- return false;
-
- op1 = op1->next;
- op2 = op2->next;
- }
- return !op1 && !op2;
-}
-
-defn (fn_eq)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_integer (op1) == get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_integer (get_integer (op1) == get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_integer (get_float (op1) == get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_float (op1) == get_integer (op2)));
- else if (op1->type == ITEM_LIST && op2->type == ITEM_LIST)
- ok = push (ctx, new_integer (compare_lists
- (get_list (op1), get_list (op2))));
- else if (op1->type == ITEM_STRING && op2->type == ITEM_STRING)
- ok = push (ctx, new_integer (compare_strings
- ((struct item_string *)(op1), (struct item_string *)(op2)) == 0));
- else
- ok = set_error (ctx, "cannot compare `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-defn (fn_lt)
-{
- check_stack (2);
- struct item *op2 = pop (ctx);
- struct item *op1 = pop (ctx);
-
- bool ok;
- if (op1->type == ITEM_INTEGER && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_integer (op1) < get_integer (op2)));
- else if (op1->type == ITEM_INTEGER && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_integer (get_integer (op1) < get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_FLOAT)
- ok = push (ctx, new_integer (get_float (op1) < get_float (op2)));
- else if (op1->type == ITEM_FLOAT && op2->type == ITEM_INTEGER)
- ok = push (ctx, new_integer (get_float (op1) < get_integer (op2)));
- else if (op1->type == ITEM_STRING && op2->type == ITEM_STRING)
- ok = push (ctx, new_integer (compare_strings
- ((struct item_string *)(op1), (struct item_string *)(op2)) < 0));
- else
- ok = set_error (ctx, "cannot compare `%s' and `%s'",
- item_type_to_str (op1->type), item_type_to_str (op2->type));
-
- item_free (op1);
- item_free (op2);
- return ok;
-}
-
-// - - Utilities - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-defn (fn_rand)
-{
- return push (ctx, new_float ((long double) rand ()
- / ((long double) RAND_MAX + 1)));
-}
-
-defn (fn_time)
-{
- return push (ctx, new_integer (time (NULL)));
-}
-
-// XXX: this is a bit too constrained; combines strftime() with gmtime()
-defn (fn_strftime)
-{
- check_stack (2);
- struct item *format = pop (ctx);
- struct item *time_ = pop (ctx);
- bool success = false;
- if (!check_type (ctx, time_, ITEM_INTEGER)
- || !check_type (ctx, format, ITEM_STRING))
- goto fail;
-
- if (get_integer (time_) < 0)
- {
- set_error (ctx, "invalid time value");
- goto fail;
- }
-
- char buf[128];
- time_t time__ = get_integer (time_);
- struct tm tm;
- gmtime_r (&time__, &tm);
- buf[strftime (buf, sizeof buf, get_string (format), &tm)] = '\0';
- success = push (ctx, new_string (buf, -1));
-
-fail:
- item_free (time_);
- item_free (format);
- return success;
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-static void item_list_to_str (const struct item *, struct buffer *);
-
-static void
-string_to_str (const struct item_string *string, struct buffer *buf)
-{
- buffer_append_c (buf, '"');
- for (size_t i = 0; i < string->len; i++)
- {
- char c = string->value[i];
- if (c == '\n') buffer_append (buf, "\\n", 2);
- else if (c == '\r') buffer_append (buf, "\\r", 2);
- else if (c == '\t') buffer_append (buf, "\\t", 2);
- else if (!isprint (c))
- {
- char tmp[8];
- snprintf (tmp, sizeof tmp, "\\x%02x", (unsigned char) c);
- buffer_append (buf, tmp, strlen (tmp));
- }
- else if (c == '\\') buffer_append (buf, "\\\\", 2);
- else if (c == '"') buffer_append (buf, "\\\"", 2);
- else buffer_append_c (buf, c);
- }
- buffer_append_c (buf, '"');
-}
-
-static void
-item_to_str (const struct item *item, struct buffer *buf)
-{
- switch (item->type)
- {
- char *x;
- case ITEM_STRING:
- string_to_str ((struct item_string *) item, buf);
- break;
- case ITEM_WORD:
- {
- struct item_word *word = (struct item_word *) item;
- buffer_append (buf, word->value, word->len);
- break;
- }
- case ITEM_INTEGER:
- if (!(x = strdup_printf ("%lld", get_integer (item))))
- goto alloc_failure;
- buffer_append (buf, x, strlen (x));
- free (x);
- break;
- case ITEM_FLOAT:
- if (!(x = strdup_printf ("%Lf", get_float (item))))
- goto alloc_failure;
- buffer_append (buf, x, strlen (x));
- free (x);
- break;
- case ITEM_LIST:
- buffer_append_c (buf, '[');
- item_list_to_str (get_list (item), buf);
- buffer_append_c (buf, ']');
- break;
- }
- return;
-
-alloc_failure:
- // This is a bit hackish but it simplifies stuff
- buf->memory_failure = true;
- free (buf->s);
- buf->s = NULL;
-}
-
-static void
-item_list_to_str (const struct item *script, struct buffer *buf)
-{
- if (!script)
- return;
-
- item_to_str (script, buf);
- while ((script = script->next))
- {
- buffer_append_c (buf, ' ');
- item_to_str (script, buf);
- }
-}
-
-// --- IRC protocol ------------------------------------------------------------
-
-struct message
-{
- char *prefix; ///< Message prefix
- char *command; ///< IRC command
- char *params[16]; ///< Command parameters (0-terminated)
- size_t n_params; ///< Number of parameters present
-};
-
-inline static char *
-cut_word (char **s)
-{
- char *start = *s, *end = *s + strcspn (*s, " ");
- *s = end + strspn (end, " ");
- *end = '\0';
- return start;
-}
-
-static bool
-parse_message (char *s, struct message *msg)
-{
- memset (msg, 0, sizeof *msg);
-
- // Ignore IRC 3.2 message tags, if present
- if (*s == '@')
- {
- s += strcspn (s, " ");
- s += strspn (s, " ");
- }
-
- // Prefix
- if (*s == ':')
- msg->prefix = cut_word (&s) + 1;
-
- // Command
- if (!*(msg->command = cut_word (&s)))
- return false;
-
- // Parameters
- while (*s)
- {
- size_t n = msg->n_params++;
- if (msg->n_params >= N_ELEMENTS (msg->params))
- return false;
- if (*s == ':')
- {
- msg->params[n] = ++s;
- break;
- }
- msg->params[n] = cut_word (&s);
- }
- return true;
-}
-
-static struct message *
-read_message (void)
-{
- static bool discard = false;
- static char buf[1025];
- static struct message msg;
-
- bool discard_this;
- do
- {
- if (!fgets (buf, sizeof buf, stdin))
- return NULL;
- size_t len = strlen (buf);
-
- // Just to be on the safe side, if the line overflows our buffer,
- // ignore everything up until the next line.
- discard_this = discard;
- if (len >= 2 && !strcmp (buf + len - 2, "\r\n"))
- {
- buf[len -= 2] = '\0';
- discard = false;
- }
- else
- discard = true;
- }
- // Invalid messages are silently ignored
- while (discard_this || !parse_message (buf, &msg));
- return &msg;
-}
-
-// --- Interfacing with the bot ------------------------------------------------
-
-#define BOT_PRINT "ZYKLONB print :script: "
-
-static const char *
-get_config (const char *key)
-{
- printf ("ZYKLONB get_config :%s\r\n", key);
- struct message *msg = read_message ();
- if (!msg || msg->n_params <= 0)
- exit (EXIT_FAILURE);
- return msg->params[0];
-}
-
-// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
-
-// TODO: implement more functions; try to avoid writing them in C
-
-static bool
-init_runtime_library_scripts (void)
-{
- bool ok = true;
-
- // It's much cheaper (and more fun) to define functions in terms of other
- // ones. The "unit tests" serve a secondary purpose of showing the usage.
- struct script
- {
- const char *name; ///< Name of the function
- const char *definition; ///< The defining script
- const char *unit_test; ///< Trivial unit test, must return 1
- }
- scripts[] =
- {
- { "nip", "swap drop", "1 2 nip 2 =" },
- { "over", "[dup] dip swap", "1 2 over nip nip 1 =" },
- { "swons", "swap cons", "[2] 1 swons [1 2] =" },
- { "first", "uncons drop", "[1 2 3] first 1 =" },
- { "rest", "uncons swap drop", "[1 2 3] rest [2 3] =" },
- { "reverse", "[] swap [swap cons] each", "[1 2] reverse [2 1] =" },
- { "curry", "cons", "1 2 [+] curry call 3 =" },
-
- { "xor", "not swap not + 1 =", "1 1 xor 0 =" },
- { "min", "over over < [drop] [nip] if", "1 2 min 1 =" },
- { "max", "over over > [drop] [nip] if", "1 2 max 2 =" },
-
- { "all?", "[and] cat 1 swap fold", "[3 4 5] [> 3] all? 0 =" },
- { "any?", "[or] cat 0 swap fold", "[3 4 5] [> 3] any? 1 =" },
-
- { ">", "swap <", "1 2 > 0 =" },
- { "!=", "= not", "1 2 != 1 =" },
- { "<=", "> not", "1 2 <= 1 =" },
- { ">=", "< not", "1 2 >= 0 =" },
-
- // XXX: this is a bit crazy and does not work with an empty list
- { "join", "[uncons] dip swap [[dup] dip swap [+ +] dip] each drop",
- "[1 2 3] [>string] map \" -> \" join \"1 -> 2 -> 3\" =" },
- };
-
- for (size_t i = 0; i < N_ELEMENTS (scripts); i++)
- {
- const char *error = NULL;
- struct item *script = parse (scripts[i].definition, &error);
- if (error)
- {
- printf (BOT_PRINT "error parsing internal script `%s': %s\r\n",
- scripts[i].definition, error);
- ok = false;
- }
- else
- ok &= register_script (scripts[i].name, script);
- }
-
- struct context ctx;
- for (size_t i = 0; i < N_ELEMENTS (scripts); i++)
- {
- const char *error = NULL;
- struct item *script = parse (scripts[i].unit_test, &error);
- if (error)
- {
- printf (BOT_PRINT "error parsing unit test for `%s': %s\r\n",
- scripts[i].name, error);
- ok = false;
- continue;
- }
- context_init (&ctx);
- execute (&ctx, script);
- item_free_list (script);
-
- const char *failure = NULL;
- if (ctx.memory_failure)
- failure = "memory allocation failure";
- else if (ctx.error)
- failure = ctx.error;
- else if (ctx.stack_size != 1)
- failure = "too many results on the stack";
- else if (ctx.stack->type != ITEM_INTEGER)
- failure = "result is not an integer";
- else if (get_integer (ctx.stack) != 1)
- failure = "wrong test result";
- if (failure)
- {
- printf (BOT_PRINT "error executing unit test for `%s': %s\r\n",
- scripts[i].name, failure);
- ok = false;
- }
- context_free (&ctx);
- }
- return ok;
-}
-
-static bool
-init_runtime_library (void)
-{
- bool ok = true;
-
- // Type detection
- ok &= register_handler ("string?", fn_is_string);
- ok &= register_handler ("word?", fn_is_word);
- ok &= register_handler ("integer?", fn_is_integer);
- ok &= register_handler ("float?", fn_is_float);
- ok &= register_handler ("list?", fn_is_list);
-
- // Type conversion
- ok &= register_handler (">string", fn_to_string);
- ok &= register_handler (">integer", fn_to_integer);
- ok &= register_handler (">float", fn_to_float);
-
- // Miscellaneous
- ok &= register_handler ("length", fn_length);
-
- // Basic stack manipulation
- ok &= register_handler ("dup", fn_dup);
- ok &= register_handler ("drop", fn_drop);
- ok &= register_handler ("swap", fn_swap);
-
- // Calling stuff
- ok &= register_handler ("call", fn_call);
- ok &= register_handler ("dip", fn_dip);
-
- // Control flow
- ok &= register_handler ("if", fn_if);
- ok &= register_handler ("try", fn_try);
-
- // List processing
- ok &= register_handler ("map", fn_map);
- ok &= register_handler ("filter", fn_filter);
- ok &= register_handler ("fold", fn_fold);
- ok &= register_handler ("each", fn_each);
-
- // List manipulation
- ok &= register_handler ("unit", fn_unit);
- ok &= register_handler ("cons", fn_cons);
- ok &= register_handler ("cat", fn_cat);
- ok &= register_handler ("uncons", fn_uncons);
-
- // Arithmetic operations
- ok &= register_handler ("+", fn_plus);
- ok &= register_handler ("-", fn_minus);
- ok &= register_handler ("*", fn_times);
- ok &= register_handler ("^", fn_pow);
- ok &= register_handler ("/", fn_div);
- ok &= register_handler ("%", fn_mod);
-
- // Comparison
- ok &= register_handler ("=", fn_eq);
- ok &= register_handler ("<", fn_lt);
-
- // Logical operations
- ok &= register_handler ("not", fn_not);
- ok &= register_handler ("and", fn_and);
- ok &= register_handler ("or", fn_or);
-
- // Utilities
- ok &= register_handler ("rand", fn_rand);
- ok &= register_handler ("time", fn_time);
- ok &= register_handler ("strftime", fn_strftime);
-
- ok &= init_runtime_library_scripts ();
- return ok;
-}
-
-static void
-free_runtime_library (void)
-{
- struct fn *next, *iter;
- for (iter = g_functions; iter; iter = next)
- {
- next = iter->next;
- free_function (iter);
- }
-}
-
-// --- Function database -------------------------------------------------------
-
-// TODO: a global variable storing the various procedures (db)
-// XXX: defining procedures would ideally need some kind of an ACL
-
-static void
-read_db (void)
-{
- // TODO
-}
-
-static void
-write_db (void)
-{
- // TODO
-}
-
-// --- Main --------------------------------------------------------------------
-
-static char *g_prefix;
-
-struct user_info
-{
- char *ctx; ///< Context: channel or user
- char *ctx_quote; ///< Reply quotation
-};
-
-defn (fn_dot)
-{
- check_stack (1);
- struct item *item = pop (ctx);
- struct user_info *info = ctx->user_data;
-
- struct buffer buf = BUFFER_INITIALIZER;
- item_to_str (item, &buf);
- item_free (item);
- buffer_append_c (&buf, '\0');
- if (buf.memory_failure)
- {
- ctx->memory_failure = true;
- return false;
- }
-
- if (buf.len > 255)
- buf.s[255] = '\0';
-
- printf ("PRIVMSG %s :%s%s\r\n", info->ctx, info->ctx_quote, buf.s);
- free (buf.s);
- return true;
-}
-
-static void
-process_message (struct message *msg)
-{
- if (!msg->prefix
- || strcasecmp (msg->command, "PRIVMSG")
- || msg->n_params < 2)
- return;
- char *line = msg->params[1];
-
- // Filter out only our commands
- size_t prefix_len = strlen (g_prefix);
- if (strncmp (line, g_prefix, prefix_len))
- return;
- line += prefix_len;
-
- char *command = cut_word (&line);
- if (strcasecmp (command, "script"))
- return;
-
- // Retrieve information on how to respond back
- char *msg_ctx = msg->prefix, *x;
- if ((x = strchr (msg_ctx, '!')))
- *x = '\0';
-
- char *msg_ctx_quote;
- if (strchr ("#+&!", *msg->params[0]))
- {
- msg_ctx_quote = strdup_printf ("%s: ", msg_ctx);
- msg_ctx = msg->params[0];
- }
- else
- msg_ctx_quote = strdup ("");
-
- if (!msg_ctx_quote)
- {
- printf (BOT_PRINT "%s\r\n", "memory allocation failure");
- return;
- }
-
- struct user_info info;
- info.ctx = msg_ctx;
- info.ctx_quote = msg_ctx_quote;
-
- // Finally parse and execute the macro
- const char *error = NULL;
- struct item *script = parse (line, &error);
- if (error)
- {
- printf ("PRIVMSG %s :%s%s: %s\r\n",
- msg_ctx, msg_ctx_quote, "parse error", error);
- goto end;
- }
-
- struct context ctx;
- context_init (&ctx);
- ctx.user_data = &info;
- execute (&ctx, script);
- item_free_list (script);
-
- const char *failure = NULL;
- if (ctx.memory_failure)
- failure = "memory allocation failure";
- else if (ctx.error)
- failure = ctx.error;
- if (failure)
- printf ("PRIVMSG %s :%s%s: %s\r\n",
- msg_ctx, msg_ctx_quote, "runtime error", failure);
- context_free (&ctx);
-end:
- free (msg_ctx_quote);
-}
-
-int
-main (int argc, char *argv[])
-{
- freopen (NULL, "rb", stdin); setvbuf (stdin, NULL, _IOLBF, BUFSIZ);
- freopen (NULL, "wb", stdout); setvbuf (stdout, NULL, _IOLBF, BUFSIZ);
-
- struct rlimit limit =
- {
- .rlim_cur = ADDRESS_SPACE_LIMIT,
- .rlim_max = ADDRESS_SPACE_LIMIT
- };
-
- // Lower the memory limits to something sensible to prevent abuse
- (void) setrlimit (RLIMIT_AS, &limit);
-
- read_db ();
- if (!init_runtime_library ()
- || !register_handler (".", fn_dot))
- printf (BOT_PRINT "%s\r\n", "runtime library initialization failed");
-
- g_prefix = strdup (get_config ("prefix"));
- printf ("ZYKLONB register\r\n");
- struct message *msg;
- while ((msg = read_message ()))
- process_message (msg);
-
- free_runtime_library ();
- free (g_prefix);
- return 0;
-}
-
generated by cgit v1.2.3-70-g09d2 (git 2.47.0) at 2024-11-22 23:32:11 +0000