lpr: replace 0 with NULL for pointers.

Found with devel/coccinelle.

Reviewed by:	gad

usr.sbin/lpr/chkprintcap/chkprintcap.c

@@ -222,7 +222,7 @@ note_spool_dir(const struct printer *pp, const struct stat *st)
 	struct dirlist *dp, *dp2, *last;
 
 	dp = malloc(sizeof *dp);
-	if (dp == 0)
+	if (dp == NULL)
 		err(++problems, "malloc(%lu)", (u_long)sizeof *dp);
 	
 	dp->stab = *st;
@@ -233,7 +233,7 @@ note_spool_dir(const struct printer *pp, const struct stat *st)
 	if (dp->path == 0)
 		err(++problems, "malloc(%lu)", strlen(pp->spool_dir) + 1UL);
 	
-	last = 0;
+	last = NULL;
 	LIST_FOREACH(dp2, &dirlist, link) {
 		if(!lessp(dp, dp2))
 			break;
@@ -255,7 +255,7 @@ check_spool_dirs(void)
 	for (dp = LIST_FIRST(&dirlist); dp; dp = dp2) {
 		dp2 = LIST_NEXT(dp, link);
 
-		if (dp2 != 0 && equal(dp, dp2)) {
+		if (dp2 != NULL && equal(dp, dp2)) {
 			++problems;
 			if (strcmp(dp->path, dp2->path) == 0) {
 				warnx("%s and %s share the same spool, %s",
@@ -289,7 +289,7 @@ make_spool_dir(const struct printer *pp)
 		return;
 	}
 	gr = getgrnam("daemon");
-	if (gr == 0)
+	if (gr == NULL)
 		errx(++problems, "cannot locate daemon group");
 
 	if (chown(sd, pp->daemon_user, gr->gr_gid) < 0) {

usr.sbin/lpr/common_source/common.c

@@ -282,7 +282,7 @@ lock_file_name(const struct printer *pp, char *buf, size_t len)
 {
 	static char staticbuf[MAXPATHLEN];
 
-	if (buf == 0)
+	if (buf == NULL)
 		buf = staticbuf;
 	if (len == 0)
 		len = MAXPATHLEN;
@@ -300,7 +300,7 @@ status_file_name(const struct printer *pp, char *buf, size_t len)
 {
 	static char staticbuf[MAXPATHLEN];
 
-	if (buf == 0)
+	if (buf == NULL)
 		buf = staticbuf;
 	if (len == 0)
 		len = MAXPATHLEN;

usr.sbin/lpr/common_source/net.c

@@ -280,7 +280,7 @@ writel(int strm, ...)
 
 	if (n > NIOV) {
 		iovp = malloc(n * sizeof *iovp);
-		if (iovp == 0)
+		if (iovp == NULL)
 			return -1;
 	}
 

usr.sbin/lpr/common_source/printcap.c

@@ -220,7 +220,7 @@ getprintcap_int(char *bp, struct printer *pp)
 	char *rp_name;
 	int error;
 
-	if ((pp->printer = capdb_canonical_name(bp)) == 0)
+	if ((pp->printer = capdb_canonical_name(bp)) == NULL)
 		return PCAPERR_OSERR;
 
 #define CHK(x) do {if ((x) == PCAPERR_OSERR) return PCAPERR_OSERR;}while(0)
@@ -386,7 +386,7 @@ capdb_getaltstr(char *bp, const char *shrt, const char *lng,
 		return status;
 	if (dflt) {
 		*result = strdup(dflt);
-		if (*result == 0)
+		if (*result == NULL)
 			return PCAPERR_OSERR;
 		return strlen(*result);
 	}
@@ -439,9 +439,9 @@ capdb_canonical_name(const char *bp)
 	const char *nameend;
 
 	nameend = strpbrk(bp, "|:");
-	if (nameend == 0)
+	if (nameend == NULL)
 		nameend = bp + 1;
-	if ((retval = malloc(nameend - bp + 1)) != 0) {
+	if ((retval = malloc(nameend - bp + 1)) != NULL) {
 		retval[0] = '\0';
 		strncat(retval, bp, nameend - bp);
 	}

usr.sbin/lpr/common_source/request.c

@@ -69,11 +69,11 @@ free_request(struct request *rp)
 		free(rp->prettyname);
 	if (rp->authinfo)
 		free(rp->authinfo);
-	while ((ru = TAILQ_FIRST(&rp->users)) != 0) {
+	while ((ru = TAILQ_FIRST(&rp->users)) != NULL) {
 		TAILQ_REMOVE(&rp->users, ru, ru_link);
 		free(ru);
 	}
-	while ((rj = TAILQ_FIRST(&rp->jobids)) != 0) {
+	while ((rj = TAILQ_FIRST(&rp->jobids)) != NULL) {
 		TAILQ_REMOVE(&rp->jobids, rj, rj_link);
 		free(rj);
 	}

usr.sbin/lpr/common_source/rmjob.c

@@ -332,7 +332,7 @@ rmremote(const struct printer *pp)
 	else
 		niov = 4 + requests + 1;
 	iov = malloc(niov * sizeof *iov);
-	if (iov == 0)
+	if (iov == NULL)
 		fatal(pp, "out of memory in rmremote()");
 	iov[0].iov_base = "\5";
 	iov[1].iov_base = pp->remote_queue;

usr.sbin/lpr/lpc/lpc.c

@@ -103,7 +103,7 @@ main(int argc, char *argv[])
 			printf("?Ambiguous command\n");
 			exit(1);
 		}
-		if (c == 0) {
+		if (c == NULL) {
 			printf("?Invalid command\n");
 			exit(1);
 		}
@@ -112,7 +112,7 @@ main(int argc, char *argv[])
 			printf("?Privileged command\n");
 			exit(1);
 		}
-		if (c->c_generic != 0)
+		if (c->c_generic != NULL)
 			generic(c->c_generic, c->c_opts, c->c_handler,
 			    argc, argv);
 		else
@@ -205,7 +205,7 @@ cmdscanner(void)
 			printf("?Ambiguous command\n");
 			continue;
 		}
-		if (c == 0) {
+		if (c == NULL) {
 			printf("?Invalid command\n");
 			continue;
 		}
@@ -222,7 +222,7 @@ cmdscanner(void)
 		 * routine might also be set on a generic routine for
 		 * initial parameter processing.
 		 */
-		if (c->c_generic != 0)
+		if (c->c_generic != NULL)
 			generic(c->c_generic, c->c_opts, c->c_handler,
 			    margc, margv);
 		else
@@ -239,7 +239,7 @@ getcmd(const char *name)
 
 	longest = 0;
 	nmatches = 0;
-	found = 0;
+	found = NULL;
 	for (c = cmdtab; (p = c->c_name); c++) {
 		for (q = name; *q == *p++; q++)
 			if (*q == 0)		/* exact match? */
@@ -283,7 +283,7 @@ makeargv(void)
 			break;
 		*cp++ = '\0';
 	}
-	*argp++ = 0;
+	*argp++ = NULL;
 }
 
 #define HELPINDENT (sizeof ("directory"))

usr.sbin/lpr/lpd/printjob.c

@@ -673,7 +673,7 @@ print(struct printer *pp, int format, char *file)
 			av[i++] = "-L";
 			av[i++] = *locale ? locale : "C";
 			av[i++] = "-F";
-			av[i] = 0;
+			av[i] = NULL;
 			fo = ofd;
 			goto start;
 		}
@@ -795,7 +795,7 @@ print(struct printer *pp, int format, char *file)
 	av[n++] = "-h";
 	av[n++] = origin_host;
 	av[n++] = pp->acct_file;
-	av[n] = 0;
+	av[n] = NULL;
 	fo = pfd;
 	if (of_pid > 0) {		/* stop output filter */
 		write(ofd, "\031\1", 2);
@@ -1737,7 +1737,7 @@ init(struct printer *pp)
 	sprintf(&length[2], "%ld", pp->page_length);
 	sprintf(&pxwidth[2], "%ld", pp->page_pwidth);
 	sprintf(&pxlength[2], "%ld", pp->page_plength);
-	if ((s = checkremote(pp)) != 0) {
+	if ((s = checkremote(pp)) != NULL) {
 		syslog(LOG_WARNING, "%s", s);
 		free(s);
 	}