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Full Discussion: Null metacharacter?
Top Forums Shell Programming and Scripting Null metacharacter? Post 97059 by jim mcnamara on Wednesday 25th of January 2006 03:59:30 PM
Old 01-25-2006
I'm not sure why you think you need this, ASCII NUL is the end of a string. The dirent struct member d_name is a char *. So it will be interpreted as ending with the character before the NUL.

the null character is
Code:
\000

 

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GETDENTS(2)						     Linux Programmer's Manual						       GETDENTS(2)

NAME
getdents - get directory entries SYNOPSIS
#include <unistd.h> #include <linux/types.h> #include <linux/dirent.h> #include <linux/unistd.h> _syscall3(int, getdents, uint, fd, struct dirent *, dirp, uint, count); int getdents(unsigned int fd, struct dirent *dirp, unsigned int count); DESCRIPTION
getdents reads several dirent structures from the directory pointed at by fd into the memory area pointed to by dirp. The parameter count is the size of the memory area. The dirent structure is declared as follows: struct dirent { long d_ino; /* inode number */ off_t d_off; /* offset to next dirent */ unsigned short d_reclen; /* length of this dirent */ char d_name [NAME_MAX+1]; /* file name (null-terminated) */ } d_ino is an inode number. d_off is the distance from the start of the directory to the start of the next dirent. d_reclen is the size of this entire dirent. d_name is a null-terminated file name. This call supersedes readdir(2). RETURN VALUE
On success, the number of bytes read is returned. On end of directory, 0 is returned. On error, -1 is returned, and errno is set appro- priately. ERRORS
EBADF Invalid file descriptor fd. EFAULT Argument points outside the calling process's address space. EINVAL Result buffer is too small. ENOENT No such directory. ENOTDIR File descriptor does not refer to a directory. CONFORMING TO
SVr4, SVID. SVr4 documents additional ENOLINK, EIO error conditions. SEE ALSO
readdir(2), readdir(3) Linux 1.3.6 1995-07-22 GETDENTS(2)
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