webServer/UtilFun.cpp at master · chuanxo/webServer · GitHub

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//
// Created by parallels on 2020/1/16.
//

#include "UtilFun.h"

ssize_t readn(int fd, void *buff, size_t n) {
    size_t nleft = n;
    ssize_t nread = 0;
    ssize_t readSum = 0;
    char *ptr = (char *)buff;
    while (nleft > 0) {
        if ((nread = read(fd, ptr, nleft)) < 0) {
            if (errno == EINTR)
                nread = 0;
            else if (errno == EAGAIN) {
                return readSum;
            } else {
                return -1;
            }
        } else if (nread == 0)
            break;
        readSum += nread;
        nleft -= nread;
        ptr += nread;
    }
    return readSum;
}

ssize_t readn(int fd, std::string &inBuffer, bool &zero) {
    ssize_t nread = 0;
    ssize_t readSum = 0;
    while (true) {
        char buff[MAXLINE];
        if ((nread = read(fd, buff, MAXLINE)) < 0) {
            if (errno == EINTR)
                continue;
            else if (errno == EAGAIN) {
                return readSum;
            } else {
                perror("read error");
                return -1;
            }
        } else if (nread == 0) {
            // printf("redsum = %d\n", readSum);
            zero = true;
            break;
        }
        readSum += nread;
        inBuffer += std::string(buff, buff + nread);
    }
    return readSum;
}


ssize_t writen2(int fd, void *buff, size_t n) {
    size_t nleft = n;
    ssize_t nwritten = 0;
    ssize_t writeSum = 0;
    char *ptr = (char *)buff;
    while (nleft > 0) {
        if ((nwritten = write(fd, ptr, nleft)) <= 0) {
            if (nwritten < 0) {
                if (errno == EINTR) {
                    nwritten = 0;
                    continue;
                } else if (errno == EAGAIN) {
                    return writeSum;
                } else
                    return -1;
            }
        }
        writeSum += nwritten;
        nleft -= nwritten;
        ptr += nwritten;
    }
    return writeSum;
}


ssize_t writen(int fd, std::string &sbuff) {
    size_t nleft = sbuff.size();
    ssize_t nwritten = 0;
    ssize_t writeSum = 0;
    const char *ptr = sbuff.c_str();
    while (nleft > 0) {
        if ((nwritten = write(fd, ptr, nleft)) <= 0) {
            if (nwritten < 0) {
                if (errno == EINTR) {
                    nwritten = 0;
                    continue;
                } else if (errno == EAGAIN)
                    break;
                else
                    return -1;
            }
        }
        writeSum += nwritten;
        nleft -= nwritten;
        ptr += nwritten;
    }
    if (writeSum == static_cast<int>(sbuff.size()))
        sbuff.clear();
    else
        sbuff = sbuff.substr(writeSum);
    return writeSum;
}