p4-1.c

UNIX程序设计教程

#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "err_exit.h"
void * xmalloc(int);
read_specs(char *filename)
{
    int desc;
    struct stat statbuf;
    char *buffer;
    register char *p;
    /* 打开文件并获取文件信息 */
    desc = open(filename, O_RDONLY, 0);
    if(desc < 0)
       err_exit(filename);
    if(stat(filename,&statbuf) < 0)
       err_exit(filename);
    /* 根据成员st_size调xmalloc函数来为buffer分配空间 */
    buffer = xmalloc((unsigned)statbuf.st_size + 1);
    /* 读整个文件内容至buffer */
    read(desc,buffer,(unsigned)statbuf.st_size);
    buffer[statbuf.st_size] = 0;
    close(desc);
    /* 处理读入的文件，... */
   
}