79 lines
1.6 KiB
C
79 lines
1.6 KiB
C
#include "cache.h"
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int copy_fd(int ifd, int ofd)
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{
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while (1) {
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char buffer[8192];
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char *buf = buffer;
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ssize_t len = xread(ifd, buffer, sizeof(buffer));
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if (!len)
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break;
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if (len < 0) {
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int read_error = errno;
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close(ifd);
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return error("copy-fd: read returned %s",
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strerror(read_error));
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}
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while (len) {
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int written = xwrite(ofd, buf, len);
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if (written > 0) {
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buf += written;
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len -= written;
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}
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else if (!written) {
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close(ifd);
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return error("copy-fd: write returned 0");
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} else {
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int write_error = errno;
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close(ifd);
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return error("copy-fd: write returned %s",
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strerror(write_error));
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}
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}
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}
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close(ifd);
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return 0;
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}
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static int copy_times(const char *dst, const char *src)
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{
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struct stat st;
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struct utimbuf times;
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if (stat(src, &st) < 0)
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return -1;
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times.actime = st.st_atime;
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times.modtime = st.st_mtime;
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if (utime(dst, ×) < 0)
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return -1;
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return 0;
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}
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int copy_file(const char *dst, const char *src, int mode)
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{
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int fdi, fdo, status;
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mode = (mode & 0111) ? 0777 : 0666;
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if ((fdi = open(src, O_RDONLY)) < 0)
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return fdi;
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if ((fdo = open(dst, O_WRONLY | O_CREAT | O_EXCL, mode)) < 0) {
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close(fdi);
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return fdo;
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}
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status = copy_fd(fdi, fdo);
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if (close(fdo) != 0)
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return error("%s: close error: %s", dst, strerror(errno));
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if (!status && adjust_shared_perm(dst))
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return -1;
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return status;
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}
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int copy_file_with_time(const char *dst, const char *src, int mode)
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{
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int status = copy_file(dst, src, mode);
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if (!status)
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return copy_times(dst, src);
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return status;
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}
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