如何使用 read() 部分读取输入直到换行?
How to partially read input until a new line using read()?
我正在尝试部分读取输入,直到输入新行“\n”。但是我怎样才能用 read() 函数做到这一点呢?现在我已经进行了部分读取,直到注销终端界面并停止输入(在 linux 终端上按 ctrl+d),但不知道如何在换行时停止输入。这是我的代码:
int fd = 0;
const size_t read_size = 100;
size_t size = read_size;
char *buff = malloc(size+1);
size_t offset = 0;
size_t res = 0;
while((res = read(fd, buff + offset, read_size)) > 0)
{
offset += res;
buff[offset] = '[=10=]';
if (offset + read_size > size)
{
size *= 2;
buff = realloc(buff, size+1);
}
}
return buff;
I'm trying to partially read input until a new line is inputed "\n". But how can I do that with the read() function?
使用 read
实现此目的的唯一方法是一次读取一个字符。读完 '\n'
字符后,停止。
how do I check what is being read?
while (read(fd, buf + offset, 1) == 1) {
if (buf[offset] == '\n') break;
offset += 1;
}
我正在尝试部分读取输入,直到输入新行“\n”。但是我怎样才能用 read() 函数做到这一点呢?现在我已经进行了部分读取,直到注销终端界面并停止输入(在 linux 终端上按 ctrl+d),但不知道如何在换行时停止输入。这是我的代码:
int fd = 0;
const size_t read_size = 100;
size_t size = read_size;
char *buff = malloc(size+1);
size_t offset = 0;
size_t res = 0;
while((res = read(fd, buff + offset, read_size)) > 0)
{
offset += res;
buff[offset] = '[=10=]';
if (offset + read_size > size)
{
size *= 2;
buff = realloc(buff, size+1);
}
}
return buff;
I'm trying to partially read input until a new line is inputed "\n". But how can I do that with the read() function?
使用 read
实现此目的的唯一方法是一次读取一个字符。读完 '\n'
字符后,停止。
how do I check what is being read?
while (read(fd, buf + offset, 1) == 1) {
if (buf[offset] == '\n') break;
offset += 1;
}