用C语言编写文件复制程序。分别使用系统调用read (fd,buf,nbytes)、write(fd, buf,nbytes)和文件的库函数fread(buf,size,nitems,fp)、fwrite(buf,size,nitems,fp),编写一个文件复制程序。
时间: 2024-02-13 19:05:07 浏览: 27
好的,下面是使用系统调用read和write实现文件复制的C语言代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
int source_file, dest_file, num_read;
char buffer[BUFFER_SIZE];
// 打开源文件
source_file = open(argv[1], O_RDONLY);
if (source_file == -1) {
perror("Failed to open source file");
exit(EXIT_FAILURE);
}
// 创建目标文件
dest_file = open(argv[2], O_WRONLY | O_CREAT | O_TRUNC, 0666);
if (dest_file == -1) {
perror("Failed to create destination file");
exit(EXIT_FAILURE);
}
// 从源文件中读取数据,并写入目标文件
while ((num_read = read(source_file, buffer, BUFFER_SIZE)) > 0) {
if (write(dest_file, buffer, num_read) != num_read) {
perror("Failed to write to destination file");
exit(EXIT_FAILURE);
}
}
// 关闭文件
close(source_file);
close(dest_file);
return 0;
}
```
下面是使用文件的库函数fread和fwrite实现文件复制的C语言代码:
```c
#include <stdio.h>
#include <stdlib.h>
#define BUFFER_SIZE 1024
int main(int argc, char *argv[]) {
FILE *source_file, *dest_file;
char buffer[BUFFER_SIZE];
size_t num_read;
// 打开源文件
source_file = fopen(argv[1], "rb");
if (!source_file) {
perror("Failed to open source file");
exit(EXIT_FAILURE);
}
// 创建目标文件
dest_file = fopen(argv[2], "wb");
if (!dest_file) {
perror("Failed to create destination file");
exit(EXIT_FAILURE);
}
// 从源文件中读取数据,并写入目标文件
while ((num_read = fread(buffer, 1, BUFFER_SIZE, source_file)) > 0) {
if (fwrite(buffer, 1, num_read, dest_file) != num_read) {
perror("Failed to write to destination file");
exit(EXIT_FAILURE);
}
}
// 关闭文件
fclose(source_file);
fclose(dest_file);
return 0;
}
```
以上就是使用系统调用和文件的库函数分别实现文件复制的C语言代码。
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