flexlint rears its head as well as some style(9) fixes[1]. Fixed a
few bugs for a few corner cases and correctly handle the case where read(2) is read()'ing from a non-file descriptor and could get fewer bytes back than the buffer, but it isn't EOF[2]. random(6) extensively tested and believed to be bug free (save performance for large files). Submitted by: mkm [1], tjr[2]
This commit is contained in:
Sean Chittenden
parent
4444375710
commit
3f4b504568
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=110928
@ -4,6 +4,6 @@
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PROG= random
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MAN= random.6
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SRCS= random.c randomize_fd.c
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WARNS= 5
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WARNS?= 5
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.include <bsd.prog.mk>
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@ -42,12 +42,13 @@ static const char copyright[] =
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)random.c 8.5 (Berkeley) 4/5/94";
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static const char sccsid[] = "@(#)random.c 8.5 (Berkeley) 4/5/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <err.h>
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@ -56,14 +57,16 @@ static const char rcsid[] =
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "randomize_fd.h"
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void usage(void);
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static void usage(void);
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int
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main(int argc, char **argv)
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main(int argc, char *argv[])
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{
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double denom;
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int ch, fd, random_exit, randomize_lines, random_type, ret,
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@ -149,7 +152,7 @@ main(int argc, char **argv)
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*/
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if (randomize_lines) {
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if ((fd = open(filename, O_RDONLY, 0)) < 0)
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err(1, "%s", optarg);
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err(1, "%s", filename);
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ret = randomize_fd(fd, random_type, unique_output, denom);
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if (!random_exit)
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return(ret);
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@ -157,7 +160,7 @@ main(int argc, char **argv)
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/* Compute a random exit status between 0 and denom - 1. */
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if (random_exit)
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return ((denom * random()) / LONG_MAX);
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return (int)((denom * random()) / LONG_MAX);
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/*
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* Select whether to print the first line. (Prime the pump.)
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@ -183,10 +186,10 @@ main(int argc, char **argv)
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exit (0);
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}
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void
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usage()
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: random [-elruUw] [-f filename] [denominator]\n");
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fprintf(stderr, "usage: random [-elruUw] [-f filename] [denominator]\n");
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exit(1);
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}
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@ -22,18 +22,28 @@
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <ctype.h>
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#include <err.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "randomize_fd.h"
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struct rand_node *rand_root;
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struct rand_node *rand_tail;
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static struct rand_node *rand_root;
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static struct rand_node *rand_tail;
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static
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struct rand_node *rand_node_allocate(void)
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static struct rand_node *
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rand_node_allocate(void)
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{
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struct rand_node *n;
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@ -47,9 +57,8 @@ struct rand_node *rand_node_allocate(void)
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return(n);
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}
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static
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void rand_node_free(struct rand_node *n)
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static void
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rand_node_free(struct rand_node *n)
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{
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if (n != NULL) {
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if (n->cp != NULL)
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@ -59,9 +68,8 @@ void rand_node_free(struct rand_node *n)
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}
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}
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static
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void rand_node_free_rec(struct rand_node *n)
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static void
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rand_node_free_rec(struct rand_node *n)
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{
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if (n != NULL) {
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if (n->next != NULL)
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@ -71,31 +79,30 @@ void rand_node_free_rec(struct rand_node *n)
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}
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}
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static
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struct rand_node *rand_node_append(struct rand_node *n)
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static void
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rand_node_append(struct rand_node *n)
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{
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if (rand_root == NULL) {
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if (rand_root == NULL)
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rand_root = rand_tail = n;
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return(n);
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} else {
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else {
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rand_tail->next = n;
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rand_tail = n;
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return(n);
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}
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}
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int randomize_fd(int fd, int type, int unique, double denom)
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int
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randomize_fd(int fd, int type, int unique, double denom)
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{
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u_char *buf, *p;
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u_int numnode, j, selected, slen;
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struct rand_node *n, *prev;
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int bufc, bufleft, buflen, eof, fndstr, i, len, ret;
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int bufleft, eof, fndstr, ret;
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size_t bufc, buflen, i;
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ssize_t len;
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rand_root = rand_tail = NULL;
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bufc = bufleft = eof = fndstr = numnode = 0;
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bufc = i = 0;
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bufleft = eof = fndstr = numnode = ret = 0;
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if (type == RANDOM_TYPE_UNSET)
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type = RANDOM_TYPE_LINES;
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@ -111,23 +118,22 @@ int randomize_fd(int fd, int type, int unique, double denom)
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len = read(fd, buf, buflen);
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if (len == -1)
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err(1, "read");
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else if (len == 0)
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break;
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else if (len < buflen) {
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buflen = len;
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else if (len == 0) {
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eof++;
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}
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break;
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} else if ((size_t)len < buflen)
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buflen = (size_t)len;
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bufleft = len;
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bufleft = (int)len;
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}
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/* Look for a newline */
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for (i = bufc; i <= buflen; i++, bufleft--) {
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for (i = bufc; i <= buflen && bufleft >= 0; i++, bufleft--) {
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if (i == buflen) {
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if (fndstr) {
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if (!eof) {
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memmove(buf, &buf[bufc], i - bufc);
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i = i - bufc;
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i -= bufc;
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bufc = 0;
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len = read(fd, &buf[i], buflen - i);
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if (len == -1)
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@ -135,10 +141,10 @@ int randomize_fd(int fd, int type, int unique, double denom)
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else if (len == 0) {
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eof++;
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break;
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} else if (len < buflen -i )
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buflen = i + len;
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} else if (len < (ssize_t)(buflen - i))
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buflen = i + (size_t)len;
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bufleft = len;
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bufleft = (int)len;
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fndstr = 0;
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}
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} else {
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@ -154,10 +160,10 @@ int randomize_fd(int fd, int type, int unique, double denom)
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else if (len == 0) {
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eof++;
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break;
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} else if (len < buflen -i )
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buflen = len;
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} else if (len < (ssize_t)(buflen - i))
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buflen = (size_t)len;
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bufleft = len;
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bufleft = (int)len;
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}
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buflen *= 2;
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@ -167,19 +173,22 @@ int randomize_fd(int fd, int type, int unique, double denom)
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if ((type == RANDOM_TYPE_LINES && buf[i] == '\n') ||
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(type == RANDOM_TYPE_WORDS && isspace((int)buf[i])) ||
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(eof && i == buflen - 1)) {
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make_token:
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n = rand_node_allocate();
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slen = i - bufc;
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n->len = slen + 2;
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n->cp = (u_char *)malloc(slen + 2);
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if (n->cp == NULL)
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err(1, "malloc");
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if (-1 != (int)i) {
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slen = i - (u_long)bufc;
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n->len = slen + 2;
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n->cp = (u_char *)malloc(slen + 2);
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if (n->cp == NULL)
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err(1, "malloc");
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memmove(n->cp, &buf[bufc], slen);
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n->cp[slen] = buf[i];
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n->cp[slen + 1] = '\0';
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bufc = i + 1;
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fndstr = 1;
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memmove(n->cp, &buf[bufc], slen);
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n->cp[slen] = buf[i];
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n->cp[slen + 1] = '\0';
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bufc = i + 1;
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}
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rand_node_append(n);
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fndstr = 1;
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numnode++;
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}
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}
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@ -187,12 +196,21 @@ int randomize_fd(int fd, int type, int unique, double denom)
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(void)close(fd);
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/* Necessary evil to compensate for files that don't end with a newline */
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if (bufc != i) {
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i--;
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goto make_token;
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}
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for (i = numnode; i > 0; i--) {
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selected = ((int)denom * random())/(((double)RAND_MAX + 1) / numnode);
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for (j = 0, prev = n = rand_root; n != NULL; j++, prev = n, n = n->next) {
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if (j == selected) {
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ret = printf("%.*s", n->len - 1, n->cp);
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if (n->cp == NULL)
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break;
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ret = printf("%.*s", (int)n->len - 1, n->cp);
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if (ret < 0)
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err(1, "printf");
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if (unique) {
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@ -29,17 +29,6 @@
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#ifndef __RANDOMIZE_FD__
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#define __RANDOMIZE_FD__
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define RANDOM_TYPE_UNSET 0
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#define RANDOM_TYPE_LINES 1
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#define RANDOM_TYPE_WORDS 2
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