feat(lexer): 添加SCC语言扩展关键字支持并重构标准定义

- 将SCC_CEXT_ASM重命名为SCC_CEXT_SCC以更好地反映扩展类型
- 为asm关键字添加SCC_CEXT_SCC标准标识
- 新增atomic、auto、bool、complex四个关键字及其对应的token类型
- 所有新关键字都标记为SCC_CEXT_SCC扩展标准

fix(lexer): 修复数字字面量解析中的类型不匹配问题

- 将token->value.n更正为token->value.u以正确存储解析结果
- 统一了词法分析器中数值解析的字段访问

refactor(log): 重构日志系统API设计并增强功能

- 将日志处理器接口从void返回改为int返回类型
- 新增函数名记录功能，通过__func__宏获取当前函数名
- 引入可变参数支持，允许格式化字符串传递
- 重构内部宏实现，使用SCC_LOG_IMPL统一处理逻辑
- 改进缓冲区管理，优化日志消息格式化流程
- 重命名头文件保护宏从__SCC_LOG_H__到__SCC_LOG_IMPL_H__
- 替换snprintf为vsnprintf以支持可变参数处理
- 更新断言宏实现，提供更清晰的错误信息格式

libs/lexer/include/lexer_token.h

@@ -6,17 +6,21 @@
 typedef enum scc_cstd {
     SCC_CSTD_C89,
     SCC_CSTD_C99,
-    SCC_CEXT_ASM,
+    SCC_CEXT_SCC,
 } scc_cstd_t;
 
 /* clang-format off */
 // WARNING: Using Binary Search To Fast Find Keyword
 // 你必须确保其中是按照字典序排列
 #define SCC_CKEYWORD_TABLE \
-    X(asm           , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_ASM       , SCC_CEXT_ASM) \
+    X(asm           , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_ASM       , SCC_CEXT_SCC) \
+    X(atomic        , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_ATOMIC    , SCC_CEXT_SCC) \
+    X(auto          , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_AUTO      , SCC_CEXT_SCC) \
+    X(bool          , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_BOOL      , SCC_CEXT_SCC) \
     X(break         , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_BREAK     , SCC_CSTD_C89) \
     X(case          , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_CASE      , SCC_CSTD_C89) \
     X(char          , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_CHAR      , SCC_CSTD_C89) \
+    X(complex       , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_COMPLEX   , SCC_CEXT_SCC) \
     X(const         , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_CONST     , SCC_CSTD_C89) \
     X(continue      , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_CONTINUE  , SCC_CSTD_C89) \
     X(default       , SCC_TOK_SUBTYPE_KEYWORD  , SCC_TOK_DEFAULT   , SCC_CSTD_C89) \

libs/lexer/src/lexer.c

@@ -92,7 +92,7 @@ static void parse_line(scc_lexer_t *lexer, scc_lexer_tok_t *token) {
 
     if (scc_probe_stream_consume(stream) != ' ') {
         scc_lex_parse_skip_line(stream, &lexer->pos);
-        token->loc.line = token->value.n;
+        token->loc.line = token->value.u;
     }
 
     if (scc_probe_stream_next(stream) != '"') {
@@ -385,7 +385,7 @@ void scc_lexer_get_token(scc_lexer_t *lexer, scc_lexer_tok_t *token) {
         scc_probe_stream_reset(stream);
         if (scc_lex_parse_number(stream, &lexer->pos, &output) == true) {
             scc_probe_stream_sync(stream);
-            token->value.n = output;
+            token->value.u = output;
         } else {
             LEX_ERROR("Unexpected number literal");
             token->type = SCC_TOK_UNKNOWN;

runtime/log/include/log.c

@@ -1,63 +1,60 @@
 #include <log.h>
 
-void log_default_handler(log_level_t level, const char *module,
+static inline int log_snprintf(char *s, size_t n, const char *format, ...) {
-                         const char *file, int line, const char *message) {
+    int ret;
-    const char *level_str;
+    va_list args;
-    switch (level) {
+    va_start(args, format);
-    case LOG_LEVEL_DEBUG:
+    ret = log_vsnprintf(s, n, format, args);
-        level_str = "DEBUG";
+    va_end(args);
-        break;
+    return ret;
-    case LOG_LEVEL_INFO:
+}
-        level_str = "INFO ";
-        break;
-    case LOG_LEVEL_WARN:
-        level_str = "WARN ";
-        break;
-    case LOG_LEVEL_ERROR:
-        level_str = "ERROR";
-        break;
-    case LOG_LEVEL_FATAL:
-        level_str = "FATAL";
-        break;
-    case LOG_LEVEL_TRACE:
-        level_str = "TRACE";
-        break;
-    default:
-        level_str = "NOTSET";
-        break;
-    }
 
-/// @note: 定义 __LOG_NO_COLOR__ 会取消颜色输出
+int log_default_handler(logger_t *module, log_level_t level, const char *file,
-#ifndef __LOG_NO_COLOR__
+                        int line, const char *func, const char *fmt, ...) {
+    const char *level_str;
+    int offset = 0;
+    va_list args;
+    va_start(args, fmt);
+    /* clang-format off */
+    switch (level) {
+    case LOG_LEVEL_DEBUG: level_str = "DEBUG"; break;
+    case LOG_LEVEL_INFO:  level_str = "INFO "; break;
+    case LOG_LEVEL_WARN:  level_str = "WARN "; break;
+    case LOG_LEVEL_ERROR: level_str = "ERROR"; break;
+    case LOG_LEVEL_FATAL: level_str = "FATAL"; break;
+    case LOG_LEVEL_TRACE: level_str = "TRACE"; break;
+    default:              level_str = "NOTSET"; break;
+    }
+    /// @note: 定义 __LOG_NO_COLOR__ 会取消颜色输出
+    #ifndef __LOG_NO_COLOR__
     const char *color_code;
     switch (level) {
-    case LOG_LEVEL_DEBUG:
+        case LOG_LEVEL_DEBUG: color_code = ANSI_FG_CYAN; break;
-        color_code = ANSI_FG_CYAN;
+        case LOG_LEVEL_INFO:  color_code = ANSI_FG_GREEN; break;
-        break;
+        case LOG_LEVEL_TRACE: color_code = ANSI_FG_BLUE; break;
-    case LOG_LEVEL_INFO:
+        case LOG_LEVEL_WARN:  color_code = ANSI_FG_YELLOW; break;
-        color_code = ANSI_FG_GREEN;
+        case LOG_LEVEL_ERROR: color_code = ANSI_FG_RED; break;
-        break;
+        case LOG_LEVEL_FATAL: color_code = ANSI_FG_RED ANSI_UNDERLINED; break;
-    case LOG_LEVEL_TRACE:
+        default: color_code = ANSI_NONE;
-        color_code = ANSI_FG_BLUE;
-        break;
-    case LOG_LEVEL_WARN:
-        color_code = ANSI_FG_YELLOW;
-        break;
-    case LOG_LEVEL_ERROR:
-        color_code = ANSI_FG_RED;
-        break;
-    case LOG_LEVEL_FATAL:
-        color_code = ANSI_FG_RED ANSI_UNDERLINED;
-        break; // 增强对比度
-    default:
-        color_code = ANSI_NONE;
     }
-
+    /* clang-format on */
-    log_printf(ANSI_BOLD "%s[%s] - %s - %s:%d | %s" ANSI_NONE "\n", color_code,
+    offset =
-               level_str, module, file, line, message);
+        log_snprintf(module->buf, sizeof(module->buf),
+                     ANSI_BOLD "%s[%s] %s - %s:%d in %s()" ANSI_NONE " ",
+                     color_code, level_str, module->name, file, line, func);
 #else
-    log_printf("[%s] %s:%d | %s: %s\n", level_str, file, line, module, message);
+    offset = log_snprintf(module->buf, sizeof(module->buf),
+                          "[%s] %s - %s:%d in %s() ", level_str, module->name,
+                          file, line, func);
 #endif
+    /* 然后写入用户消息（如果有） */
+    if (fmt && fmt[0]) {
+        log_vsnprintf(module->buf + offset, sizeof(module->buf) - offset, fmt,
+                      args);
+    }
+    va_end(args);
+    log_puts(module->buf);
+    log_puts("\n");
     // for clangd warning
     // clang-analyzer-deadcode.DeadStores
     (void)color_code;
@@ -65,6 +62,7 @@ void log_default_handler(log_level_t level, const char *module,
     if (level & LOG_LEVEL_FATAL) {
         log_exit(-LOG_LEVEL_FATAL);
     }
+    return 0;
 }
 
 logger_t __default_logger_root = {

runtime/log/include/log.h

@@ -3,17 +3,18 @@
  * @brief 日志系统核心模块（支持多级日志、断言和异常处理）
  */
 
-#ifndef __SCC_LOG_H__
+#ifndef __SCC_LOG_IMPL_H__
-#define __SCC_LOG_H__
+#define __SCC_LOG_IMPL_H__
 
 #include "color.h"
+#include <stdarg.h>
 
-#ifdef __SCC_LOG_USE_STD_IMPL__
+#ifdef __SCC_LOG_IMPL_USE_STD_IMPL__
 #include <stdio.h>
 #include <stdlib.h>
-#define log_snprintf snprintf
+#define log_vsnprintf vsnprintf
-#define log_printf printf
+#define log_puts puts
-#define log_exit exit
+#define log_exit scc_exit
 #endif
 
 #ifdef __GNUC__ // GCC, Clang, ICC
@@ -26,14 +27,14 @@
 #define __smcc_log_unreachable()
 #endif
 
-#ifndef log_snprintf
+#ifndef log_vsnprintf
-#define log_snprintf(...)
+#define log_vsnprintf(...)
-#warning "log_snprintf not defined"
+#warning "log_vsnprintf not defined"
 #endif
 
-#ifndef log_printf
+#ifndef log_puts
-#define log_printf(...)
+#define log_puts(...)
-#warning "log_printf not defined"
+#warning "log_puts not defined"
 #endif
 
 #ifndef log_exit
@@ -57,36 +58,30 @@ typedef enum log_level {
     LOG_LEVEL_ALL = 0xFF,     ///< 全级别标志（组合所有日志级别）
 } log_level_t;
 
-/**
- * @brief 日志处理回调函数类型
- * @param level 日志级别
- * @param module 模块名称（可为NULL）
- * @param file 源文件名
- * @param line 代码行号
- * @param message 格式化后的日志消息
- * @todo 待实现模块名称，输入的模块名称，都将被忽略
- */
-typedef void (*log_handler)(log_level_t level, const char *module,
-                            const char *file, int line, const char *message);
-
 #ifndef LOGGER_MAX_BUF_SIZE
 #define LOGGER_MAX_BUF_SIZE 512 ///< 单条日志最大缓冲区尺寸
 #endif
 
+typedef struct logger logger_t;
+
+typedef int (*log_handler)(logger_t *module, log_level_t level,
+                           const char *file, int line, const char *func,
+                           const char *fmt, ...);
+
 /**
  * @brief 日志器实例结构体
  *
  * 每个日志器实例维护独立的配置和缓冲区
  */
-typedef struct logger {
+struct logger {
     const char *name;              ///< 日志器名称（用于模块区分）
     log_level_t level;             ///< 当前设置的日志级别
     log_handler handler;           ///< 日志处理回调函数
     char buf[LOGGER_MAX_BUF_SIZE]; ///< 格式化缓冲区
-} logger_t;
+};
 
-void log_default_handler(log_level_t level, const char *module,
+int log_default_handler(logger_t *module, log_level_t level, const char *file,
-                         const char *file, int line, const char *message);
+                        int line, const char *func, const char *fmt, ...);
 extern logger_t __default_logger_root;
 
 /**
@@ -114,46 +109,38 @@ void log_set_handler(logger_t *logger, log_handler handler);
 #define LOG_MAX_MAROC_BUF_SIZE LOGGER_MAX_BUF_SIZE ///< 宏展开缓冲区尺寸
 #endif
 
-/**
+#define SCC_LOG_HANDLE_ARGS(_module_, _level_, ...)                            \
- * @def _LOG
+    (_module_), (_level_), __FILE__, __LINE__, __func__, ##__VA_ARGS__
- * @brief 内部日志宏（供其他日志宏调用）
+
- * @param _module_ 模块实例（NULL表示使用默认日志器）
+#define SCC_LOG_IMPL(_module_, _level_, _fmt_, ...)                            \
- * @param _level_ 日志级别
- * @param _msg_ 格式字符串
- * @param ... 可变参数列表
- */
-#define _LOG(_module_, _level_, _msg_, ...)                                    \
     do {                                                                       \
-        logger_t *_logger = _module_;                                          \
+        /* TODO check _module_ is NULL */                                      \
-        if (_logger && _logger->handler && (_logger->level & (_level_))) {     \
+        if ((_module_)->handler && ((_module_)->level & (_level_)))            \
-            log_snprintf(_logger->buf, sizeof(_logger->buf), (_msg_),          \
+            (_module_)->handler(                                               \
-                         ##__VA_ARGS__);                                       \
+                SCC_LOG_HANDLE_ARGS(_module_, _level_, _fmt_, ##__VA_ARGS__)); \
-            _logger->handler((_level_), _logger->name, __FILE__, __LINE__,     \
-                             _logger->buf);                                    \
-        }                                                                      \
     } while (0)
 
 /* clang-format off */
 /// @name 模块日志宏
 /// @{
-#define MLOG_NOTSET(module, ...)_LOG(module, LOG_LEVEL_NOTSET, __VA_ARGS__) ///< 未分类日志
+#define MLOG_NOTSET(module, ...)SCC_LOG_IMPL(module, LOG_LEVEL_NOTSET, __VA_ARGS__) ///< 未分类日志
-#define MLOG_DEBUG(module, ...) _LOG(module, LOG_LEVEL_DEBUG, __VA_ARGS__) ///< 调试日志（需启用DEBUG级别）
+#define MLOG_DEBUG(module, ...) SCC_LOG_IMPL(module, LOG_LEVEL_DEBUG, __VA_ARGS__) ///< 调试日志（需启用DEBUG级别）
-#define MLOG_INFO(module, ...)  _LOG(module, LOG_LEVEL_INFO, __VA_ARGS__) ///< 信息日志（常规运行日志）
+#define MLOG_INFO(module, ...)  SCC_LOG_IMPL(module, LOG_LEVEL_INFO, __VA_ARGS__) ///< 信息日志（常规运行日志）
-#define MLOG_WARN(module, ...)  _LOG(module, LOG_LEVEL_WARN, __VA_ARGS__) ///< 警告日志（潜在问题）
+#define MLOG_WARN(module, ...)  SCC_LOG_IMPL(module, LOG_LEVEL_WARN, __VA_ARGS__) ///< 警告日志（潜在问题）
-#define MLOG_ERROR(module, ...) _LOG(module, LOG_LEVEL_ERROR, __VA_ARGS__) ///< 错误日志（可恢复错误）
+#define MLOG_ERROR(module, ...) SCC_LOG_IMPL(module, LOG_LEVEL_ERROR, __VA_ARGS__) ///< 错误日志（可恢复错误）
-#define MLOG_FATAL(module, ...) _LOG(module, LOG_LEVEL_FATAL, __VA_ARGS__) ///< 致命错误日志（程序终止前）
+#define MLOG_FATAL(module, ...) SCC_LOG_IMPL(module, LOG_LEVEL_FATAL, __VA_ARGS__) ///< 致命错误日志（程序终止前）
-#define MLOG_TRACE(module, ...) _LOG(module, LOG_LEVEL_TRACE, __VA_ARGS__) ///< 追踪日志（调用栈跟踪）
+#define MLOG_TRACE(module, ...) SCC_LOG_IMPL(module, LOG_LEVEL_TRACE, __VA_ARGS__) ///< 追踪日志（调用栈跟踪）
 /// @}
 
 /// @name 快捷日志宏
 /// @{
-#define LOG_NOTSET(...) _LOG(&__default_logger_root, LOG_LEVEL_NOTSET, __VA_ARGS__) ///< 未分类日志
+#define LOG_NOTSET(...) SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_NOTSET, __VA_ARGS__) ///< 未分类日志
-#define LOG_DEBUG(...)  _LOG(&__default_logger_root, LOG_LEVEL_DEBUG, __VA_ARGS__) ///< 调试日志（需启用DEBUG级别）
+#define LOG_DEBUG(...)  SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_DEBUG, __VA_ARGS__) ///< 调试日志（需启用DEBUG级别）
-#define LOG_INFO(...)   _LOG(&__default_logger_root, LOG_LEVEL_INFO, __VA_ARGS__) ///< 信息日志（常规运行日志）
+#define LOG_INFO(...)   SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_INFO, __VA_ARGS__) ///< 信息日志（常规运行日志）
-#define LOG_WARN(...)   _LOG(&__default_logger_root, LOG_LEVEL_WARN, __VA_ARGS__) ///< 警告日志（潜在问题）
+#define LOG_WARN(...)   SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_WARN, __VA_ARGS__) ///< 警告日志（潜在问题）
-#define LOG_ERROR(...)  _LOG(&__default_logger_root, LOG_LEVEL_ERROR, __VA_ARGS__) ///< 错误日志（可恢复错误）
+#define LOG_ERROR(...)  SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_ERROR, __VA_ARGS__) ///< 错误日志（可恢复错误）
-#define LOG_FATAL(...)  _LOG(&__default_logger_root, LOG_LEVEL_FATAL, __VA_ARGS__) ///< 致命错误日志（程序终止前）
+#define LOG_FATAL(...)  SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_FATAL, __VA_ARGS__) ///< 致命错误日志（程序终止前）
-#define LOG_TRACE(...)  _LOG(&__default_logger_root, LOG_LEVEL_TRACE, __VA_ARGS__) ///< 追踪日志（调用栈跟踪）
+#define LOG_TRACE(...)  SCC_LOG_IMPL(&__default_logger_root, LOG_LEVEL_TRACE, __VA_ARGS__) ///< 追踪日志（调用栈跟踪）
 /// @}
 /* clang-format on */
 
@@ -164,35 +151,48 @@ void log_set_handler(logger_t *logger, log_handler handler);
  * @param ... 错误信息参数（格式字符串+参数）
  */
 #define _Assert(cond, ...)                                                     \
-    do {                                                                       \
+    ((void)((cond) ||                                                          \
-        if (!(cond)) {                                                         \
+            (__default_logger_root.handler(SCC_LOG_HANDLE_ARGS(                \
-            LOG_FATAL(__VA_ARGS__);                                            \
+                 &__default_logger_root, LOG_LEVEL_FATAL, __VA_ARGS__)),       \
-            log_exit(1);                                                       \
+             log_exit(1), __smcc_log_unreachable(), 0)))
-            __smcc_log_unreachable();                                          \
-        }                                                                      \
-    } while (0)
 
 /// @name 断言工具宏
 /// @{
-#define __INNER_LOG_STR(str) #str
+#define __INNERSCC_LOG_IMPL_STR(str) #str
-#define __LOG_STR(str) __INNER_LOG_STR(str)
+#define _SCC_LOG_IMPL_STR(str) __INNERSCC_LOG_IMPL_STR(str)
 #define AssertFmt(cond, format, ...)                                           \
     _Assert(cond, "Assertion Failure: " format,                                \
             ##__VA_ARGS__) ///< 带格式的断言检查
 #define PanicFmt(format, ...)                                                  \
     _Assert(0, "Panic: " format, ##__VA_ARGS__) ///< 立即触发致命错误
 #define Assert(cond)                                                           \
-    AssertFmt(cond, "cond is `" __LOG_STR(cond) "`") ///< 基础断言检查
+    AssertFmt(cond, "cond is `" _SCC_LOG_IMPL_STR(cond) "`") ///< 基础断言检查
 #define Panic(...) PanicFmt(__VA_ARGS__) ///< 触发致命错误（带自定义消息）
 #define TODO()                                                                 \
     PanicFmt("TODO please implement me") ///< 标记未实现代码（触发致命错误）
 #define UNREACHABLE() PanicFmt("UNREACHABLE") ///< 触发致命错误（代码不可达）
 #define FIXME(str)                                                             \
-    PanicFmt("FIXME " __LOG_STR(str)) ///< 提醒开发者修改代码（触发致命错误）
+    PanicFmt("FIXME " _SCC_LOG_IMPL_STR(                                       \
+        str)) ///< 提醒开发者修改代码（触发致命错误）
 /// @}
 
-#ifdef __SCC_LOG_IMPORT_SRC__
+/**
+ * @brief 静态断言（编译时）
+ *
+ * 利用数组大小不能为负的特性
+ * 或使用 _Static_assert (C11)
+ */
+#ifdef static_assert
+#undef static_assert
+#endif
+#if __STDC_VERSION__ >= 201112L
+#define static_assert _Static_assert
+#else
+#define static_assert(cond, msg) extern char __static_assertion[(cond) ? 1 : -1]
+#endif
+
+#ifdef __SCC_LOG_IMPL_IMPORT_SRC__
 #include "log.c"
 #endif
 
-#endif /* __SCC_LOG_H__ */
+#endif /* __SCC_LOG_IMPL_H__ */

runtime/scc_core/include/printf/printf.h

@@ -0,0 +1,242 @@
+/**
+ * @author (c) Eyal Rozenberg <eyalroz1@gmx.com>
+ *             2021-2024, Haifa, Palestine/Israel
+ * @author (c) Marco Paland (info@paland.com)
+ *             2014-2019, PALANDesign Hannover, Germany
+ *
+ * @note Others have made smaller contributions to this file: see the
+ * contributors page at https://github.com/eyalroz/printf/graphs/contributors
+ * or ask one of the authors.
+ *
+ * @brief Small stand-alone implementation of the printf family of functions
+ * (`(v)printf`, `(v)s(n)printf` etc., geared towards use on embedded systems
+ * with a very limited resources.
+ *
+ * @note the implementations are thread-safe; re-entrant; use no functions from
+ * the standard library; and do not dynamically allocate any memory.
+ *
+ * @license The MIT License (MIT)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef PRINTF_H_
+#define PRINTF_H_
+
+#ifdef PRINTF_INCLUDE_CONFIG_H
+#include "printf_config.h"
+#endif
+
+#ifdef __cplusplus
+# include <cstdarg>
+# include <cstddef>
+extern "C" {
+#else
+# include <stdarg.h>
+# include <stddef.h>
+#endif
+
+#ifdef __GNUC__
+# if ((__GNUC__ == 4 && __GNUC_MINOR__>= 4) || __GNUC__ > 4)
+#  define ATTR_PRINTF(one_based_format_index, first_arg) \
+__attribute__((format(gnu_printf, (one_based_format_index), (first_arg))))
+# else
+# define ATTR_PRINTF(one_based_format_index, first_arg) \
+__attribute__((format(printf, (one_based_format_index), (first_arg))))
+# endif
+# define ATTR_VPRINTF(one_based_format_index) \
+ATTR_PRINTF((one_based_format_index), 0)
+#else
+# define ATTR_PRINTF(one_based_format_index, first_arg)
+# define ATTR_VPRINTF(one_based_format_index)
+#endif
+
+#ifndef PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_SOFT
+#define PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_SOFT 0
+#endif
+
+#ifndef PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_HARD
+#define PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_HARD 0
+#endif
+
+#if PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_HARD
+# define printf_    printf
+# define sprintf_   sprintf
+# define vsprintf_  vsprintf
+# define snprintf_  snprintf
+# define vsnprintf_ vsnprintf
+# define vprintf_   vprintf
+#endif
+
+/*
+ * If you want to include this implementation file directly rather than
+ * link against it, this will let you control the functions' visibility,
+ * e.g. make them static so as not to clash with other objects also
+ * using them.
+ */
+#ifndef PRINTF_VISIBILITY
+#define PRINTF_VISIBILITY
+#endif
+
+/**
+ * Prints/send a single character to some opaque output entity
+ *
+ * @note This function is not implemented by the library, only declared; you
+ * must provide an implementation if you wish to use the @ref printf / @ref
+ * vprintf function (and possibly for linking against the library, if your
+ * toolchain does not support discarding unused functions)
+ *
+ * @note The output could be as simple as a wrapper for the `write()` system
+ * call on a Unix-like * system, or even libc's @ref putchar , for replicating
+ * actual functionality of libc's @ref printf * function; but on an embedded
+ * system it may involve interaction with a special output device, like a UART,
+ * etc.
+ *
+ * @note in libc's @ref putchar, the parameter type is an int; this was intended
+ * to support the representation of either a proper character or EOF in a
+ * variable - but this is really not meaningful to pass into @ref putchar and is
+ * discouraged today. See further discussion in:
+ * @link https://stackoverflow.com/q/17452847/1593077
+ *
+ * @param c the single character to print
+ */
+PRINTF_VISIBILITY
+void putchar_(char c);
+
+
+/**
+ * An implementation of the C standard's printf/vprintf
+ *
+ * @note you must implement a @ref putchar_ function for using this function -
+ * it invokes @ref putchar_ * rather than directly performing any I/O (which
+ * insulates it from any dependence on the operating system * and external
+ * libraries).
+ *
+ * @param format A string specifying the format of the output, with %-marked
+ *     specifiers of how to interpret additional arguments.
+ * @param arg Additional arguments to the function, one for each %-specifier in
+ *     @p format
+ * @return The number of characters written into @p s, not counting the
+ *     terminating null character
+ */
+/* @{ */
+PRINTF_VISIBILITY
+int printf_(const char* format, ...) ATTR_PRINTF(1, 2);
+PRINTF_VISIBILITY
+int vprintf_(const char* format, va_list arg) ATTR_VPRINTF(1);
+/* @} */
+
+
+/**
+ * An implementation of the C standard's sprintf/vsprintf
+ *
+ * @note For security considerations (the potential for exceeding the buffer
+ * bounds), please consider using the size-constrained variant, @ref snprintf /
+ * @ref vsnprintf, instead.
+ *
+ * @param s An array in which to store the formatted string. It must be large
+ *     enough to fit the formatted output!
+ * @param format A string specifying the format of the output, with %-marked
+ *     specifiers of how to interpret additional arguments
+ * @param arg Additional arguments to the function, one for each specifier in
+ *     @p format
+ * @return The number of characters written into @p s, not counting the
+ *     terminating null character
+ */
+/* @{ */
+PRINTF_VISIBILITY
+int  sprintf_(char* s, const char* format, ...) ATTR_PRINTF(2, 3);
+PRINTF_VISIBILITY
+int vsprintf_(char* s, const char* format, va_list arg) ATTR_VPRINTF(2);
+/* @} */
+
+
+/**
+ * An implementation of the C standard's snprintf/vsnprintf
+ *
+ * @param s An array in which to store the formatted string. It must be large
+ *     enough to fit either the entire formatted output, or at least @p n
+ *     characters. Alternatively, it can be NULL, in which case nothing will
+ *     be printed, and only the number of characters which _could_ have been
+ *     printed is tallied and returned.
+ * @param n The maximum number of characters to write to the array, including
+ *     a terminating null character
+ * @param format A string specifying the format of the output, with %-marked
+ *     specifiers of how to interpret additional arguments.
+ * @param arg Additional arguments to the function, one for each specifier in
+ *     @p format
+ * @return The number of characters that COULD have been written into @p s, not
+ *     counting the terminating null character. A value equal or larger than
+ *     @p n indicates truncation. Only when the returned value is non-negative
+ *     and less than @p n, the null-terminated string has been fully and
+ *     successfully printed.
+ */
+/* @{ */
+PRINTF_VISIBILITY
+int  snprintf_(char* s, size_t count, const char* format, ...) ATTR_PRINTF(3, 4);
+PRINTF_VISIBILITY
+int vsnprintf_(char* s, size_t count, const char* format, va_list arg) ATTR_VPRINTF(3);
+/* @} */
+
+/**
+ * printf/vprintf with user-specified output function
+ *
+ * An alternative to @ref printf_, in which the output function is specified
+ * dynamically (rather than @ref putchar_ being used)
+ *
+ * @param out An output function which takes one character and a type-erased
+ *     additional parameters
+ * @param extra_arg The type-erased argument to pass to the output function @p
+ *     out with each call
+ * @param format A string specifying the format of the output, with %-marked
+ *     specifiers of how to interpret additional arguments.
+ * @param arg Additional arguments to the function, one for each specifier in
+ *     @p format
+ * @return The number of characters for which the output f unction was invoked,
+ *     not counting the terminating null character
+ *
+ */
+PRINTF_VISIBILITY
+int fctprintf(void (*out)(char c, void* extra_arg), void* extra_arg, const char* format, ...) ATTR_PRINTF(3, 4);
+PRINTF_VISIBILITY
+int vfctprintf(void (*out)(char c, void* extra_arg), void* extra_arg, const char* format, va_list arg) ATTR_VPRINTF(3);
+
+#ifdef __cplusplus
+} /* extern "C" */
+#endif
+
+#if PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_HARD
+# undef printf_
+# undef sprintf_
+# undef vsprintf_
+# undef snprintf_
+# undef vsnprintf_
+# undef vprintf_
+#else
+#if PRINTF_ALIAS_STANDARD_FUNCTION_NAMES_SOFT
+# define printf     printf_
+# define sprintf    sprintf_
+# define vsprintf   vsprintf_
+# define snprintf   snprintf_
+# define vsnprintf  vsnprintf_
+# define vprintf    vprintf_
+#endif
+#endif
+
+#endif  /* PRINTF_H_ */

runtime/scc_core/include/scc_core_impl.h

@@ -3,35 +3,31 @@
 
 #include "scc_core_type.h"
 
-/* ====== 内存管理核心接口 ====== */
-
 void *scc_malloc(usize size);
 void *scc_calloc(usize count, usize size);
 void *scc_realloc(void *ptr, usize new_size);
 void scc_free(void *ptr);
 
-/* ====== 文件系统核心接口 ====== */
-
-/* 文件句柄 - 不透明指针 */
 typedef struct scc_file *scc_file_t;
 
-/* 文件打开模式 - 只保留编译器真正需要的 */
 typedef enum {
     SCC_FILE_READ,  /* 读取源文件、头文件 */
     SCC_FILE_WRITE, /* 写入目标文件、汇编文件 */
     SCC_FILE_APPEND /* 日志、调试输出 */
 } scc_fmode_t;
 
-/* 核心文件操作 */
 scc_file_t scc_fopen(const char *path, scc_fmode_t mode);
 void scc_fclose(scc_file_t file);
 usize scc_fread(scc_file_t file, void *buffer, usize size);
 usize scc_fwrite(scc_file_t file, const void *buffer, usize size);
 cbool scc_fexists(const char *path);
 
-/* ====== 输入输出核心接口 ====== */
+#include "printf/printf.h"
-
+#define scc_snprintf snprintf_
-void scc_snprintf(char *buf, usize size, const char *format, ...);
+#define scc_vsnprintf vsnprintf_
+#ifdef __SCC_CORE_FMT_IMPL__
+#include "printf/printf.c"
+#endif
 
 /* 标准输出 - 用于编译进度、结果 */
 void scc_printf(const char *format, ...);
@@ -39,8 +35,6 @@ void scc_printf(const char *format, ...);
 /* 错误输出 - 用于错误信息、警告 */
 void scc_eprintf(const char *format, ...);
 
-/* ====== 系统核心接口 ====== */
-
 /* 程序控制 */
 void scc_exit(int code);
 

runtime/scc_core/include/scc_core_log.h

@@ -1,12 +1,12 @@
 #ifndef __SCC_CORE_LOG_H__
 #define __SCC_CORE_LOG_H__
 
-#ifndef log_snprintf
+#ifndef log_vsnprintf
-#define log_snprintf scc_snprintf
+#define log_vsnprintf scc_vsnprintf
 #endif
 
-#ifndef log_printf
+#ifndef log_puts
-#define log_printf scc_printf
+#define log_puts(str) scc_printf("%s", str)
 #endif
 
 #ifndef log_exit

runtime/scc_core/include/scc_core_type.h

@@ -58,7 +58,8 @@ typedef union scc_cvalue {
 
     char ch;
     /* number value */
-    uint64_t n;
+    uint64_t u;
+    int64_t i;
 
     /* string value */
     struct {

runtime/scc_core/src/cfg.std_impl.c

@@ -2,10 +2,11 @@
 #define _CRT_SECURE_NO_WARNINGS
 #endif
 
+#define __SCC_CORE_FMT_IMPL__
 #include <scc_core_impl.h>
-#define __SCC_LOG_IMPORT_SRC__
+#define __SCC_LOG_IMPL_IMPORT_SRC__
-#define log_snprintf scc_snprintf
+#define log_vsnprintf vsnprintf_
-#define log_printf scc_printf
+#define log_puts(str) scc_printf("%s", str)
 #define log_exit scc_exit
 #include <log.h>
 
@@ -15,6 +16,7 @@
 #include <stdlib.h>
 #include <string.h>
 
+void putchar_(char c) { putchar(c); }
 /* ====== 内存管理核心接口实现 ====== */
 
 void *scc_malloc(usize size) { return malloc(size); }
@@ -71,15 +73,6 @@ cbool scc_fexists(const char *path) {
     return true;
 }
 
-/* ====== 输入输出核心接口实现 ====== */
-
-void scc_snprintf(char *buf, usize size, const char *format, ...) {
-    va_list args;
-    va_start(args, format);
-    vsnprintf(buf, size, format, args); // NOLINT
-    va_end(args);
-}
-
 void scc_printf(const char *format, ...) {
     va_list args;
     va_start(args, format);

runtime/scc_core/tests/test_log.c

@@ -1,4 +1,4 @@
-#include <libcore.h>
+#include <scc_core.h>
 #include <stdio.h>
 
 int main(void) {