Feat log

examples/log/CMakeLists.txt

@@ -7,15 +7,21 @@ add_executable(log-simple simple.c)
 target_link_libraries(log-simple bfdev)
 add_test(log-simple log-simple)
 
+add_executable(log-date date.c)
+target_link_libraries(log-date bfdev)
+add_test(log-date log-date)
+
 if(${CMAKE_PROJECT_NAME} STREQUAL "bfdev")
     install(FILES
         simple.c
+        date.c
         DESTINATION
         ${CMAKE_INSTALL_DOCDIR}/examples/log
     )
 
     install(TARGETS
         log-simple
+        log-date
         DESTINATION
         ${CMAKE_INSTALL_DOCDIR}/bin
     )

examples/log/date.c

@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2023 John Sanpe <sanpeqf@gmail.com>
+ */
+
+#define MODULE_NAME "log-date"
+#define bfdev_log_fmt(fmt) MODULE_NAME ": " fmt
+
+#include <bfdev/log.h>
+#include <bfdev/scnprintf.h>
+#include <time.h>
+#include <unistd.h>
+
+static int
+log_hook_date(bfdev_log_message_t *msg, void *pdata)
+{
+    struct tm *tm_info;
+    time_t timestamp;
+    char buff[64];
+
+    time(&timestamp);
+    tm_info = localtime(&timestamp);
+    strftime(buff, sizeof(buff), "%a %b %d %H:%M:%S %p %Z %Y", tm_info);
+
+    return bfdev_msg_append(msg, "<%s> ", buff);
+}
+
+static bfdev_log_chain_t
+log_chain_date = {
+    .func = log_hook_date,
+    .priority = 0,
+};
+
+int
+main(int argc, const char *argv[])
+{
+    unsigned int count;
+
+    bfdev_log_hook_register(&bfdev_log_default, &log_chain_date);
+    for (count = 0; count < 3; ++count) {
+        bfdev_log_info("Hello World!\n");
+        sleep(1);
+    }
+
+    return 0;
+}

include/bfdev/log.h

@@ -10,6 +10,8 @@
 #include <bfdev/types.h>
 #include <bfdev/stddef.h>
 #include <bfdev/stdarg.h>
+#include <bfdev/errno.h>
+#include <bfdev/ilist.h>
 #include <bfdev/level.h>
 #include <bfdev/bits.h>
 #include <bfdev/bitflags.h>
@@ -25,8 +27,12 @@ BFDEV_BEGIN_DECLS
 #endif
 
 typedef struct bfdev_log bfdev_log_t;
+typedef struct bfdev_log_chain bfdev_log_chain_t;
 typedef struct bfdev_log_message bfdev_log_message_t;
 
+typedef int (*bfdev_log_hook_t)
+(bfdev_log_message_t *msg, void *pdata);
+
 typedef int (*bfdev_log_write_t)
 (bfdev_log_message_t *msg, void *pdata);
 
@@ -38,22 +44,33 @@ enum bfdev_log_flags {
     BFDEV_LOG_LEVEL = BFDEV_BIT(__BFDEV_LOG_LEVEL),
 };
 
+struct bfdev_log_chain {
+    bfdev_ilist_node_t list;
+    bfdev_log_hook_t func;
+    int priority;
+};
+
 struct bfdev_log {
     unsigned int default_level;
     unsigned int record_level;
     unsigned long flags;
 
+    bfdev_ilist_head_t prefix_hooks;
+    bfdev_ilist_head_t suffix_hooks;
+
     bfdev_log_write_t write;
     void *pdata;
 };
 
 struct bfdev_log_message {
     unsigned int level;
-    char *buff;
     bfdev_size_t length;
+    char *buff;
 };
 
 #define BFDEV_LOG_STATIC(HEAD, DEFAULT, RECORD, FLAGS, WRITE, PDATA) { \
+    .prefix_hooks = BFDEV_ILIST_HEAD_STATIC(&(HEAD)->prefix_hooks), \
+    .suffix_hooks = BFDEV_ILIST_HEAD_STATIC(&(HEAD)->suffix_hooks), \
     .default_level = (DEFAULT), .record_level = (RECORD), \
     .flags = (FLAGS), .write = (WRITE), .pdata = (PDATA), \
 }
@@ -95,6 +112,18 @@ bfdev_vlog_core(bfdev_log_t *log, const char *fmt, bfdev_va_list args);
 extern __bfdev_printf(2, 3) int
 bfdev_log_core(bfdev_log_t *log, const char *fmt, ...);
 
+extern __bfdev_printf(2, 0) int
+bfdev_msg_vappend(bfdev_log_message_t *msg, const char *fmt, bfdev_va_list args);
+
+extern __bfdev_printf(2, 3) int
+bfdev_msg_append(bfdev_log_message_t *msg, const char *fmt, ...);
+
+extern int
+bfdev_log_hook_register(bfdev_log_t *log, bfdev_log_chain_t *hook);
+
+extern void
+bfdev_log_hook_unregister(bfdev_log_t *log, bfdev_log_chain_t *hook);
+
 /**
  * bfdev_log_fmt - used by the bfdev_log_*() macros to generate the bfdev_log format string
  * @fmt: format string passed from a bfdev_log_*() macro

src/log/build.cmake

@@ -6,4 +6,6 @@
 set(BFDEV_SOURCE
     ${BFDEV_SOURCE}
     ${CMAKE_CURRENT_LIST_DIR}/log.c
+    ${CMAKE_CURRENT_LIST_DIR}/color.c
+    ${CMAKE_CURRENT_LIST_DIR}/level.c
 )

src/log/color.c

@@ -3,6 +3,11 @@
  * Copyright(c) 2024 John Sanpe <sanpeqf@gmail.com>
  */
 
+#include <base.h>
+#include "log.h"
+#include <bfdev/log.h>
+#include <export.h>
+
 #define COLOR_BLACK     0
 #define COLOR_RED       1
 #define COLOR_GREEN     2
@@ -29,20 +34,20 @@ level_color[] = {
     [BFDEV_LEVEL_DEFAULT] = COLOR_FG(COLOR_DEFAULT),
 };
 
-static void
+int
 log_color_prefix(bfdev_log_t *log, bfdev_log_message_t *msg)
 {
     if (!bfdev_log_color_test(log))
-        return;
+        return -BFDEV_ENOERR;
 
-    log_scnprintf(msg, "\e[%dm", level_color[msg->level]);
+    return bfdev_msg_append(msg, "\e[%dm", level_color[msg->level]);
 }
 
-static void
+int
 log_color_suffix(bfdev_log_t *log, bfdev_log_message_t *msg)
 {
     if (!bfdev_log_color_test(log))
-        return;
+        return -BFDEV_ENOERR;
 
-    log_scnprintf(msg, "\e[0m");
+    return bfdev_msg_append(msg, "\e[0m");
 }

src/log/level.c

@@ -3,6 +3,11 @@
  * Copyright(c) 2024 John Sanpe <sanpeqf@gmail.com>
  */
 
+#include <base.h>
+#include "log.h"
+#include <bfdev/log.h>
+#include <export.h>
+
 static const char * const
 level_name[] = {
     [BFDEV_LEVEL_EMERG  ] = "emerg",
@@ -16,11 +21,11 @@ level_name[] = {
     [BFDEV_LEVEL_DEFAULT] = "default",
 };
 
-static void
-log_level(bfdev_log_t *log, bfdev_log_message_t *msg)
+int
+log_level_prefix(bfdev_log_t *log, bfdev_log_message_t *msg)
 {
     if (!bfdev_log_level_test(log))
-        return;
+        return -BFDEV_ENOERR;
 
-    log_scnprintf(msg, "[%s] ", level_name[msg->level]);
+    return bfdev_msg_append(msg, "[%s] ", level_name[msg->level]);
 }