Linux gperf command and linuxgperf command

Linux gperf command and linuxgperf command

I. Introduction

The GNU gperf tool is a perfect hash function, you can generate a hash, hash function, and C/C ++ code for a specific set of strings provided by the user. This article describes how to use gperf to implement efficient command line processing in C/C ++ code.

 

Ii. Installation

Source code download

http://www.gnu.org/software/gperf/https://savannah.gnu.org/projects/gperf

 

User Manual

http://www.gnu.org/software/gperf/manual/gperf.htmlhttp://www.cnblogs.com/napoleon_liu/archive/2010/12/27/1918057.html

 

Iii. Instances

Reference

http://blog.chinaunix.net/uid-9950859-id-98839.htmlhttp://www.ibm.com/developerworks/cn/linux/l-gperf.html

 

Example 1: Parameter Parsing

First, compile the. gperf file. Here we use example1.gperf as an example. The content is as follows:

%{    /* C code that goes verbatim in output */#include <stdio.h>#include <stdlib.h>#include <string.h>%}    struct tl{ const char* name ; const char s2;};%%"--name",'n'"--love",'l'%%int main(int argc,char **argv){    const struct tl * str2;    int i;    char *test;    for(i=1; i<argc; i++)    {        if((str2 = in_word_set(argv[i],strlen(argv[i]))) != 0)        {            switch (str2->s2)            {                case 'n':                    test=argv[i+1];                    printf("My name is %s.\n",test);                    i++;                    break;                case 'l':                    printf("successed !\n");                    break;            }        }    }    return 0;}

Then, run the following command to convert the. gperf file to the. c file.

gperf -t -L C example1.gperf > example1.c

Compile

gcc -g -o example1 example1.c

Run