GNU Readline 是一个开源的程序库，可以实现交互式的文本编辑功能。这里简单的笔记下如何编译和使用它。
官网：http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html
CONTENTS
编译：
作者编译使用的linux版本是Ubuntu14.04×64版本。
首先从官网上下载下来压缩文件。这里作者下载的版本是readline-6.3.tar.gz。
根据INSTALL文件的介绍，输入命令如下：
cstriker1407@ubuntu1404x64:~$ tar -zxf readline-6.3.tar.gz #解压缩tar包 cstriker1407@ubuntu1404x64:~$ cd readline-6.3/ cstriker1407@ubuntu1404x64:~/readline-6.3$ ./configure #生成头文件 cstriker1407@ubuntu1404x64:~/readline-6.3$ make everything #编译所有文件 cstriker1407@ubuntu1404x64:~/readline-6.3$ sudo make install #使用root权限，将编译好的库拷贝到系统中。
如果过程中出现了错误
/usr/bin/ld: cannot find -ltermcap
可以安装一个软件，命令如下：
cstriker1407@ubuntu1404x64:~/readline-6.3$ sudo apt-get install libncurses5-dev
使用：
压缩包中附带了很多例子，这里看一个最简单的：
cstriker1407@ubuntu1404x64:~/readline-6.3$ cd examples/ cstriker1407@ubuntu1404x64:~/readline-6.3/examples$ ls autoconf hist_erasedups histexamp.o Makefile rl.c rlcat.c rlfe rltest.c rlwrap-0.30.tar.gz excallback.c hist_erasedups.c hist_purgecmd Makefile.in rl-callbacktest rlcat.o rl-fgets.c rltest.o fileman hist_erasedups.o hist_purgecmd.c manexamp.c rl-callbacktest.c rlevent rl.o rlversion fileman.c histexamp hist_purgecmd.o readlinebuf.h rl-callbacktest.o rlevent.c rlptytest.c rlversion.c fileman.o histexamp.c Inputrc rl rlcat rlevent.o rltest rlversion.o cstriker1407@ubuntu1404x64:~/readline-6.3/examples$ ./rlversion 6.3
这里分析下rlversion的源码，有删改：
#if defined (HAVE_CONFIG_H)
#include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#include "posixstat.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern void exit();
#endif
#ifdef READLINE_LIBRARY
#include "readline.h"
#else
#include <readline/readline.h>
#endif
main()
{
printf ("%s\n", rl_library_version ? rl_library_version : "unknown");
exit (0);
}
由于是下载的源码编译，这里宏HAVE_CONFIG_H和READLINE_LIBRARY在makefile里面被定义了。
如果是直接安装编译好的readline库，应该可以省掉。
来看下examples下面的makefile，有删改
RL_LIBRARY_VERSION = 6.3
SHELL = /bin/sh
RM = rm -f
prefix = /usr/local
exec_prefix = ${prefix}
datarootdir = ${prefix}/share
bindir = ${exec_prefix}/bin
srcdir = .
datadir = ${datarootdir}
top_srcdir = ..
#BUILD_DIR = .
BUILD_DIR = /home/cstriker1407/readline-6.3
installdir = $(datadir)/readline
INSTALL = /usr/bin/install -c
INSTALL_PROGRAM = ${INSTALL}
INSTALL_DATA = ${INSTALL} -m 644
EXEEXT =
OBJEXT = o
# Support an alternate destination root directory for package building
DESTDIR =
DEFS = -DHAVE_CONFIG_H
CC = gcc
CFLAGS = -g -O
LOCAL_CFLAGS = -DREADLINE_LIBRARY -DRL_LIBRARY_VERSION='"$(RL_LIBRARY_VERSION)"'
CPPFLAGS =
INCLUDES = -I$(srcdir) -I$(top_srcdir) -I..
CCFLAGS = $(DEFS) $(LOCAL_CFLAGS) $(CPPFLAGS) $(INCLUDES) $(CFLAGS)
LDFLAGS = -g -L.. -L./lib/termcap
PURIFY =
READLINE_LIB = ../libreadline.a
HISTORY_LIB = ../libhistory.a
TERMCAP_LIB = -ltermcap
.c.o:
${RM} $@
$(CC) $(CCFLAGS) -c $<
SOURCES = rlversion.c
EXECUTABLES = rlversion$(EXEEXT)
OBJECTS = rlversion.o
OTHEREXE = rlptytest$(EXEEXT)
OTHEROBJ = rlptytest.o
all: $(EXECUTABLES)
everything: all
check: rlversion$(EXEEXT)
@echo Readline version: `rlversion$(EXEEXT)`
installdirs:
-$(SHELL) $(top_srcdir)/support/mkdirs $(DESTDIR)$(installdir)
install: installdirs
@for f in $(SOURCES); do \
$(RM) $(DESTDIR)$(installdir)/$$f ; \
$(INSTALL_DATA) $(srcdir)/$$f $(DESTDIR)$(installdir) ; \
done
uninstall:
@for f in $(SOURCES); do \
$(RM) $(DESTDIR)$(installdir)/$$f ; \
done
-rmdir $(DESTDIR)$(installdir)
rlversion$(EXEEXT): rlversion.o $(READLINE_LIB)
$(CC) $(LDFLAGS) -o $@ rlversion.o $(READLINE_LIB) $(TERMCAP_LIB)
clean mostlyclean:
$(RM) $(OBJECTS) $(OTHEROBJ)
$(RM) $(EXECUTABLES) $(OTHEREXE) *.exe
distclean maintainer-clean: clean
$(RM) Makefile
rlversion.o: rlversion.c
rlversion.o: $(top_srcdir)/readline.h
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