cutil-file.c

Linux环境下常用功能的实现

#include "cutil.h"

/**
 * cutil_file_get_size
 * @pszName:文件名称
 * 
 * 获取文件的大小
 * 
 * Returns: 成功返回文件大小.失败返回-1
 */
int cutil_file_get_size(const char *pszName)
{
	struct stat struStat;

	memset(&struStat,0,sizeof(struStat));
	if(stat(pszName, &struStat) != 0)
	{
		cutil_log_error(N_("get file:%s info error:%s\n"), 
			pszName, strerror(errno));
		return -1;
	}
	
	return struStat.st_size;
}

/**
 * cutil_file_clone
 * @pszFrom:原始文件名称
 * @pszTo:目标文件名称
 * @nMode: 目标文件的权限
 *
 * 复制源文件到目标文件
 * 
 * Returns: 成功返回0.失败返回-1
 */
int cutil_file_clone(const char *pszFrom, const char *pszTo, int nMode)
{
	int nFromFd, nToFd;
	char szBuffer[4096];
	int nBytesRead, nBytesWrite;
	char *pszBuffer;

	if((nFromFd = open(pszFrom, O_RDONLY)) ==  - 1)
    {
		cutil_log_error(N_("open file:%s error:%s\n"), 
			pszFrom, strerror(errno));
		return -1;
	}

    if ((nToFd = open(pszTo, O_WRONLY | O_CREAT, nMode)) ==  - 1)
    {
		cutil_log_error(N_("open file:%s error:%s\n"), 
			pszTo, strerror(errno));
		close(nFromFd);
		return -1;
    }
	
	while(1)
	{
		nBytesRead = read(nFromFd, szBuffer, sizeof(szBuffer));
		if(nBytesRead == 0)
			break;

		if ((nBytesRead ==  - 1) && (errno != EINTR))
        {
			cutil_log_error(N_("read file:%s error:%s\n"), 
				pszFrom, strerror(errno));
			close(nFromFd);
			close(nToFd);
			return -1;
        }

		pszBuffer = szBuffer;
		while(nBytesRead > 0)
		{
			nBytesWrite = write(nToFd, pszBuffer, nBytesRead);
			if ((nBytesWrite ==  - 1) && (errno != EINTR))
			{
				cutil_log_error(N_("write file:%s error:%s\n"), 
					pszTo, strerror(errno));
				close(nFromFd);
				close(nToFd);
				return -1;
			}
			pszBuffer += nBytesWrite;
			nBytesRead -= nBytesWrite;
		}
    }
    close(nFromFd);
    close(nToFd);
	return 0;
}