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| author | Jim Meyering <jim@meyering.net> | 2004-04-15 10:50:07 +0000 |
|---|---|---|
| committer | Jim Meyering <jim@meyering.net> | 2004-04-15 10:50:07 +0000 |
| commit | 0adee504ff956edb14905374208e722ca93ecd38 (patch) | |
| tree | 7e2f294c77453bdabfcade56feaff362a94c1d3f /src/shred.c | |
| parent | e28e19cbba0ba34df95914f0a656b07b28785ab5 (diff) | |
| download | coreutils-0adee504ff956edb14905374208e722ca93ecd38.tar.xz | |
Include getpagesize.h.
(dopass): Align I/O buffers to page boundaries.
Diffstat (limited to 'src/shred.c')
| -rw-r--r-- | src/shred.c | 18 |
1 files changed, 10 insertions, 8 deletions
diff --git a/src/shred.c b/src/shred.c index bb7b9c9d6..42276771a 100644 --- a/src/shred.c +++ b/src/shred.c @@ -105,6 +105,7 @@ #include "system.h" #include "xstrtol.h" #include "error.h" +#include "getpagesize.h" #include "human.h" #include "inttostr.h" #include "quotearg.h" /* For quotearg_colon */ @@ -787,11 +788,9 @@ dopass (int fd, char const *qname, off_t *sizep, int type, size_t lim; /* Amount of data to try writing */ size_t soff; /* Offset into buffer for next write */ ssize_t ssize; /* Return value from write */ -#if ISAAC_WORDS > 1024 - word32 r[ISAAC_WORDS * 3]; /* Multiple of 4K and of pattern size */ -#else - word32 r[1024 * 3]; /* Multiple of 4K and of pattern size */ -#endif + word32 *r; /* Fill pattern. */ + size_t rsize = 3 * MAX (ISAAC_WORDS, 1024) * sizeof *r; /* Fill size. */ + size_t ralign = lcm (getpagesize (), sizeof *r); /* Fill alignment. */ char pass_string[PASS_NAME_SIZE]; /* Name of current pass */ /* Printable previous offset into the file */ @@ -804,10 +803,13 @@ dopass (int fd, char const *qname, off_t *sizep, int type, return -1; } + r = alloca (rsize + ralign - 1); + r = ptr_align (r, ralign); + /* Constant fill patterns need only be set up once. */ if (type >= 0) { - lim = sizeof r; + lim = rsize; if ((off_t) lim > size && size != -1) { lim = (size_t) size; @@ -832,7 +834,7 @@ dopass (int fd, char const *qname, off_t *sizep, int type, for (;;) { /* How much to write this time? */ - lim = sizeof r; + lim = rsize; if ((off_t) lim > size - offset && size != -1) { if (size < offset) @@ -842,7 +844,7 @@ dopass (int fd, char const *qname, off_t *sizep, int type, break; } if (type < 0) - fillrand (s, r, sizeof r, lim); + fillrand (s, r, rsize, lim); /* Loop to retry partial writes. */ for (soff = 0; soff < lim; soff += ssize) { |