backup.c

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/*****************************************************************************/
#include "tpcclibConfig.h"
/*****************************************************************************/
#include "tpcextensions.h"
/*****************************************************************************/
#include "tpcfileutil.h"
/*****************************************************************************/
 
/*****************************************************************************/
int fileBackup(
  const char *filename,
  const char *backup_ext,
  char *status
) {
  char bakfile[FILENAME_MAX];
  int ret;
 
  // Check the input
  if(filename==NULL || strlen(filename)<1) {
    if(status!=NULL) sprintf(status, "invalid filename");
    return 1;
  }
 
  // Check if file exists; if not then no need to make any backup
  if(access(filename, 0) == -1) {
    if(status!=NULL) sprintf(status, "file does not pre-exist");
    return 0;
  }
  // Create filename for the backup file
  strlcpy(bakfile, filename, FILENAME_MAX);
  if(backup_ext==NULL) strlcat(bakfile, ".bak", FILENAME_MAX);
  else strlcat(bakfile, backup_ext, FILENAME_MAX);
  // If also backup file exists, then just delete it 
  if(access(bakfile, 0) != -1) {
    ret=remove(bakfile);
    if(ret!=0) {
      if(status!=NULL) sprintf(status, "cannot delete previous backup file");
      return 3;
    }
  }
  // Rename file
  ret=rename(filename, bakfile);
  if(ret!=0) {
    if(status!=NULL) sprintf(status, "cannot rename file as backup");
    return 5;
  }
  if(status!=NULL) sprintf(status, "file renamed as backup");
  return 0;
}
/*****************************************************************************/
 
/*****************************************************************************/