src/seek.c


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#include <sys/types.h>
#include "seek.h"

/**
  * @file seek.c
  * @author djb
  * @ref qmail
  * @brief seek in an open file descritor
 */

off_t lseek(int fd,off_t offset,int whence);
int ftruncate(int fd, off_t length);

#define CUR 1 /* sigh */

seek_pos seek_cur(int fd)
{ 
  return lseek(fd,(off_t) 0,CUR); 
}

#define END 2 /* sigh */

int seek_end(int fd)
{ 
  if (lseek(fd,(off_t) 0,END) == -1) return -1; 
  return 0; 
}

#define SET 0 /* sigh */

int seek_set(int fd,seek_pos pos)
{ 
  if (lseek(fd,(off_t) pos,SET) == -1) return -1; 
  return 0; 
}

int seek_trunc(int fd,seek_pos pos)
{ 
  return ftruncate(fd,(off_t) pos); 
}