root/copy.c

DEFINITIONS

1. copy_fd
2. copy_times
3. copy_file
4. copy_file_with_time

#include "cache.h"

int copy_fd(int ifd, int ofd)
{
        while (1) {
                char buffer[8192];
                ssize_t len = xread(ifd, buffer, sizeof(buffer));
                if (!len)
                        break;
                if (len < 0)
                        return COPY_READ_ERROR;
                if (write_in_full(ofd, buffer, len) < 0)
                        return COPY_WRITE_ERROR;
        }
        return 0;
}

static int copy_times(const char *dst, const char *src)
{
        struct stat st;
        struct utimbuf times;
        if (stat(src, &st) < 0)
                return -1;
        times.actime = st.st_atime;
        times.modtime = st.st_mtime;
        if (utime(dst, &times) < 0)
                return -1;
        return 0;
}

int copy_file(const char *dst, const char *src, int mode)
{
        int fdi, fdo, status;

        mode = (mode & 0111) ? 0777 : 0666;
        if ((fdi = open(src, O_RDONLY)) < 0)
                return fdi;
        if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
                close(fdi);
                return fdo;
        }
        status = copy_fd(fdi, fdo);
        switch (status) {
        case COPY_READ_ERROR:
                error("copy-fd: read returned %s", strerror(errno));
                break;
        case COPY_WRITE_ERROR:
                error("copy-fd: write returned %s", strerror(errno));
                break;
        }
        close(fdi);
        if (close(fdo) != 0)
                return error("%s: close error: %s", dst, strerror(errno));

        if (!status && adjust_shared_perm(dst))
                return -1;

        return status;
}

int copy_file_with_time(const char *dst, const char *src, int mode)
{
        int status = copy_file(dst, src, mode);
        if (!status)
                return copy_times(dst, src);
        return status;
}