zma / zlog

A low-latency in-memory C logging library

zlog - a C In-memory Logging Library

Hompage: https://www.ericzma.com/projects/zlog/

Introduction

zlog is a C in-memory logging library. It allocates a buffer in memory for logging, and flush the buffer to the log file (or stdout) when the buffer is full, or it is instructed explicitly by the program or flushing thread.

Usage example

Example.c represents an use example of zlog library containing both INFO and DEBUG messages. If you want to include DEBUG messages you must compile with -D DEBUG flag.

Makefile contains the corresponding gcc compilation commands to both INFO and DEBUG mode. Please keep in mind that DEBUG mode will log INFO and DEBUG messages whilst INFO mode will discard all DEBUG messages. The following Make commands can be used to compile either in DEBUG or INFO modes:

• make or make info for INFO mode compilation.
• make debug for DEBUG mode compilation.

Source code

Source code of zlog can be downloaded from http://github.com/zma/zlog/ . The source code is released into the public domain.

Authors and contributors

• Eric Ma (https://www.ericzma.com).
• RazviOverflow (https://github.com/RazviOverflow)

zlog's Issues

Can we use zlog on windows platform or arm platform.

Our program runs on both windows platform and Linux platform . I wonder if zlog can support windows platform . It will be better if zlog can be compiled by visual studio .

Compiler warnings: format-truncation

Hi,

I hit this issue when compiling with GCC 8 with -Wall:

zlog/zlog.c: In function ‘zlogf_time’:
zlog/zlog.c:172:51: error: ‘.’ directive output may be truncated writing 1 byte into a region of size between 0 and 127 [-Werror=format-truncation=]
     snprintf(buffer, ZLOG_BUFFER_STR_MAX_LEN, "[%s.%06lds] ", timebuf, tv.tv_usec);
                                                   ^
zlog/zlog.c:172:5: note: ‘snprintf’ output between 12 and 153 bytes into a destination of size 128
     snprintf(buffer, ZLOG_BUFFER_STR_MAX_LEN, "[%s.%06lds] ", timebuf, tv.tv_usec);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
zlog/zlog.c: In function ‘zlog_time’:
zlog/zlog.c:203:51: error: ‘.’ directive output may be truncated writing 1 byte into a region of size between 0 and 127 [-Werror=format-truncation=]
     snprintf(buffer, ZLOG_BUFFER_STR_MAX_LEN, "[%s.%06lds] [@%s:%d]", timebuf, tv.tv_usec, filename, line);
                                                   ^
zlog/zlog.c:203:5: note: ‘snprintf’ output 17 or more bytes (assuming 144) into a destination of size 128
     snprintf(buffer, ZLOG_BUFFER_STR_MAX_LEN, "[%s.%06lds] [@%s:%d]", timebuf, tv.tv_usec, filename, line);
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Thanks for zlog! :)