h**o
发帖数: 548 | 1 出境率很高,但众说纷纭，没看见合适的答案。
贴一个我的吧，包括read(dst, n) 和readline(). 欢迎讨论.
#define FOURK 4096
class readbuf{
readbuf(){remain = 0; ptr = 0;}
char buf[FOURK];
int ptr; //start ptr of buf to catch
int remain; //byte remains in buf
int readN(char*dst, int n);
int readLine(string& s);
};
int readbuf::readN(*dst, int n){
if (!dst) return 0;
int bytes = 0;
while(n>0){
if (remain==0) {nRead = read4K(buf); remain = nRread; ptr = 0;}
min = min(n, remain);
bytes+=memcpy(dst+bytes, buf, min);
ptr+=min; n-=min; remain-=min;
//break bcz no more.
if (nRead
}
return bytes;
}
int readbuf::readLine(string& s){
int bytes = 0; bool endline = false;
while(1){
if (remain==0) {nRead = read4K(buf); remain = nRread; ptr = 0;}
for(; ptr< FOURK && remain>0;ptr++, remain--) {
s.append (buf[ptr]); bytes++;
if (buf[ptr] == ' | h**o
发帖数: 548 | 2 int readbuf::readLine(string& s){
int bytes = 0; bool endline = false;
while(1){
if (nsize==0) {nRead = read4K(buf); nsize = nRread; ptr = 0;}
for(; ptr< FOURK && nsize>0;ptr++, nsize--) {
s.append (buf[ptr]); bytes++;
if (buf[ptr] == ' 0 ' || buf[ptr] ==' n') endline=true;
}
if (endline || nRead
}
} |
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