45 lines
972 B
C
45 lines
972 B
C
/*
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readdir -- read next entry from a directory stream
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last edit: 25-Apr-1987 D A Gwyn
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*/
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#include <errno.h>
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <dirent.h>
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/* SVR3 system call, or emulation for getdents() */
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extern int getdents(int fildes, char* buf, unsigned nbyte);
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#ifndef NULL
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#define NULL 0
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#endif
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struct dirent*
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readdir(register DIR* dirp)
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{
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register struct dirent* dp; /* -> directory data */
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if (dirp == NULL || dirp->dd_buf == NULL)
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{
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errno = EFAULT;
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return NULL; /* invalid pointer */
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}
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do
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{
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if (dirp->dd_loc >= dirp->dd_size) /* empty or obsolete */
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dirp->dd_loc = dirp->dd_size = 0;
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if (dirp->dd_size == 0 /* need to refill buffer */
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&& (dirp->dd_size = getdents(dirp->dd_fd, dirp->dd_buf, (unsigned)DIRBUF)) <= 0)
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return NULL; /* EOF or error */
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dp = (struct dirent*)&dirp->dd_buf[dirp->dd_loc];
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dirp->dd_loc += dp->d_reclen;
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} while (dp->d_ino == 0L); /* don't rely on getdents() */
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return dp;
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}
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