git

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#include "git-compat-util.h"
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#include "copy.h"
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#include "path.h"
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#include "gettext.h"
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#include "strbuf.h"
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#include "abspath.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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		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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			return COPY_READ_ERROR;
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		if (write_in_full(ofd, buffer, len) < 0)
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			return COPY_WRITE_ERROR;
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	}
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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, &times) < 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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	switch (status) {
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	case COPY_READ_ERROR:
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		error_errno("copy-fd: read returned");
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		break;
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	case COPY_WRITE_ERROR:
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		error_errno("copy-fd: write returned");
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		break;
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	}
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	close(fdi);
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	if (close(fdo) != 0)
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		return error_errno("%s: close error", dst);
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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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