Linux文件编程demo8文件编程小应用之修改程序的配置文件.c

原创于 2024-12-09 10:29:56 发布 · 95 阅读

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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>

int main(int argc,char **argv)
{
	int fd;
	char *readBuf = NULL;
	
	if(argc != 2){
		printf("programe error\n");
		exit(-1);
		
	}
	fd = open(argv[1],O_RDWR);
	int size = lseek(fd,0,SEEK_END);
	lseek(fd,0,SEEK_SET);
	readBuf = (char *)malloc(sizeof(char)*size+8);
	
	int n_read = read(fd,readBuf,size);
	
	char *p = strstr(readBuf,"LENG=");
	if(p==NULL){
		printf("not found\n");
		exit(-1);
	}
	p = p+strlen("LENG=");
	*p = '5';
	
	close(fd);
	return 0;
}```