lib/, src/: Use !streq() instead of its pattern

Except for the added (and sorted) includes, the removal of redundant
parentheses, and a few non-string cases that I've left out of the
change, this patch can be approximated with the following semantic
patch:

	$ cat ~/tmp/spatch/strneq.sp
	@@
	expression s;
	@@

	- '\0' != *s
	+ !streq(s, "")

	@@
	expression s;
	@@

	- '\0' != s[0]
	+ !streq(s, "")

	@@
	expression s;
	@@

	- *s != '\0'
	+ !streq(s, "")

	@@
	expression s;
	@@

	- s[0] != '\0'
	+ !streq(s, "")

	$ find contrib/ lib* src/ -type f \
	| xargs spatch --in-place --sp-file ~/tmp/spatch/strneq.sp;

Signed-off-by: Alejandro Colomar <alx@kernel.org>

lib/chkname.c

@@ -33,6 +33,7 @@
 
 #include "defines.h"
 #include "chkname.h"
+#include "string/strcmp/streq.h"
 
 
 int allow_bad_names = false;
@@ -85,7 +86,7 @@ is_valid_name(const char *name)
 
 	numeric = isdigit(*name);
 
-	while ('\0' != *++name) {
+	while (!streq(++name, "")) {
 		if (!((*name >= 'a' && *name <= 'z') ||
 		      (*name >= 'A' && *name <= 'Z') ||
 		      (*name >= '0' && *name <= '9') ||

lib/fields.c

@@ -18,6 +18,7 @@
 #include "prototypes.h"
 #include "string/strchr/stpspn.h"
 #include "string/strchr/strrspn.h"
+#include "string/strcmp/streq.h"
 #include "string/strtok/stpsep.h"
 
 
@@ -47,7 +48,7 @@ int valid_field (const char *field, const char *illegal)
 	}
 
 	/* Search if there are non-printable or control characters */
-	for (cp = field; '\0' != *cp; cp++) {
+	for (cp = field; !streq(cp, ""); cp++) {
 		unsigned char c = *cp;
 		if (!isprint (c)) {
 			err = 1;
@@ -86,7 +87,7 @@ change_field(char *buf, size_t maxsize, const char *prompt)
 	if (stpsep(newf, "\n") == NULL)
 		return;
 
-	if ('\0' != newf[0]) {
+	if (!streq(newf, "")) {
 		/*
 		 * Remove leading and trailing whitespace.  This also
 		 * makes it possible to change the field to empty, by

lib/fputsx.c

@@ -14,8 +14,7 @@
 
 #include "defines.h"
 #include "prototypes.h"
-
-#ident "$Id$"
+#include "string/strcmp/streq.h"
 
 
 /*@null@*/char *
@@ -48,7 +47,7 @@ int fputsx (const char *s, FILE * stream)
 {
 	int i;
 
-	for (i = 0; '\0' != *s; i++, s++) {
+	for (i = 0; !streq(s, ""); i++, s++) {
 		if (putc (*s, stream) == EOF) {
 			return EOF;
 		}

lib/getdate.y

@@ -627,7 +627,7 @@ static int LookupWord (char *buff)
   bool abbrev;
 
   /* Make it lowercase. */
-  for (p = buff; '\0' != *p; p++)
+  for (p = buff; !streq(p, ""); p++)
     if (isupper (*p))
       *p = tolower (*p);
 
@@ -720,7 +720,7 @@ static int LookupWord (char *buff)
     }
 
   /* Drop out any periods and try the timezone table again. */
-  for (i = 0, p = q = buff; '\0' != *q; q++)
+  for (i = 0, p = q = buff; !streq(q, ""); q++)
     if (*q != '.')
       *p++ = *q;
     else

lib/gshadow.c

@@ -42,7 +42,7 @@ build_list(char *s)
 
 	l = XMALLOC(strchrcnt(s, ',') + 2, char *);
 
-	for (i = 0; s != NULL && *s != '\0'; i++)
+	for (i = 0; s != NULL && !streq(s, ""); i++)
 		l[i] = strsep(&s, ",");
 
 	l[i] = NULL;

lib/limits.c

@@ -203,7 +203,7 @@ static int do_user_limits (const char *buf, const char *name)
 		pp = "A- C- D- F- I- L- M- N- O- P- R- S- T- U-";
 	}
 
-	while ('\0' != *pp) {
+	while (!streq(pp, "")) {
 		switch (*pp++) {
 		case 'a':
 		case 'A':

lib/myname.c

@@ -15,9 +15,13 @@
 
 #ident "$Id$"
 
-#include "defines.h"
 #include <pwd.h>
+
+#include "defines.h"
 #include "prototypes.h"
+#include "string/strcmp/streq.h"
+
+
 /*@null@*/ /*@only@*/struct passwd *get_my_pwent (void)
 {
 	struct passwd *pw;
@@ -34,7 +38,7 @@
 	 * XXX - when running from su, will return the current user (not
 	 * the original user, like getlogin() does).  Does this matter?
 	 */
-	if ((NULL != cp) && ('\0' != *cp)) {
+	if ((NULL != cp) && !streq(cp, "")) {
 		pw = xgetpwnam (cp);
 		if ((NULL != pw) && (pw->pw_uid == ruid)) {
 			return pw;

lib/nss.c

@@ -87,7 +87,7 @@ nss_init(const char *nsswitch_path) {
 			continue;
 		p = &line[6];
 		p = stpspn(p, " \t\n");
-		if (*p != '\0')
+		if (!streq(p, ""))
 			break;
 		p = NULL;
 	}

lib/obscure.c

@@ -82,7 +82,7 @@ static char *str_lower (/*@returned@*/char *string)
 {
 	char *cp;
 
-	for (cp = string; '\0' != *cp; cp++) {
+	for (cp = string; !streq(cp, ""); cp++) {
 		*cp = tolower (*cp);
 	}
 	return string;

lib/port.c

@@ -39,7 +39,7 @@ static int portcmp (const char *pattern, const char *port)
 {
 	const char *orig = port;
 
-	while (('\0' != *pattern) && (*pattern == *port)) {
+	while (!streq(pattern, "") && (*pattern == *port)) {
 		pattern++;
 		port++;
 	}
@@ -215,7 +215,7 @@ next:
 	 * Get the next comma separated entry
 	 */
 
-	for (j = 0; ('\0' != *cp) && (j < PORT_TIMES); j++) {
+	for (j = 0; !streq(cp, "") && (j < PORT_TIMES); j++) {
 
 		/*
 		 * Start off with no days of the week

lib/strtoday.c

@@ -54,7 +54,7 @@ long strtoday (const char *str)
 		s++;
 	}
 	s = stpspn(s, " ");
-	while (isnum && ('\0' != *s)) {
+	while (isnum && !streq(s, "")) {
 		if (!isdigit (*s)) {
 			isnum = false;
 		}

lib/ttytype.c

@@ -58,7 +58,7 @@ void ttytype (const char *line)
 			break;
 		}
 	}
-	if ((feof (fp) == 0) && (ferror (fp) == 0) && (type[0] != '\0')) {
+	if ((feof(fp) == 0) && (ferror(fp) == 0) && !streq(type, "")) {
 		addenv ("TERM", type);
 	}
 

lib/utmp.c

@@ -254,7 +254,7 @@ prepare_utmp(const char *name, const char *line, const char *host,
 
 
 
-	if (NULL != host && '\0' != host[0])
+	if (NULL != host && !streq(host, ""))
 		hostname = xstrdup(host);
 #if defined(HAVE_STRUCT_UTMPX_UT_HOST)
 	else if (NULL != ut && '\0' != ut->ut_host[0])

src/chfn.c

@@ -225,7 +225,7 @@ static char *copy_field (char *in, char *out, char *extra)
 			break;
 
 		if (NULL != extra) {
-			if ('\0' != extra[0]) {
+			if (!streq(extra, "")) {
 				strcat (extra, ",");
 			}
 
@@ -543,7 +543,7 @@ static void get_old_fields (const char *gecos)
 	 * Anything left over is "slop".
 	 */
 	if ((NULL != cp) && !oflg) {
-		if ('\0' != slop[0]) {
+		if (!streq(slop, "")) {
 			strcat (slop, ",");
 		}
 
@@ -702,7 +702,7 @@ int main (int argc, char **argv)
 	}
 	SNPRINTF(new_gecos, "%s,%s,%s,%s%s%s",
 	         fullnm, roomno, workph, homeph,
-	         ('\0' != slop[0]) ? "," : "", slop);
+	         (!streq(slop, "")) ? "," : "", slop);
 
 	/* Rewrite the user's gecos in the passwd file */
 	update_gecos (user, new_gecos);

src/gpasswd.c

@@ -179,7 +179,7 @@ static bool is_valid_user_list (const char *users)
 
 	tmpusers = dup = xstrdup(users);
 
-	while (NULL != tmpusers && '\0' != *tmpusers) {
+	while (NULL != tmpusers && !streq(tmpusers, "")) {
 		const char  *u;
 
 		u = strsep(&tmpusers, ",");

src/login.c

@@ -422,7 +422,7 @@ static /*@observer@*/const char *get_failent_user (/*@returned@*/const char *use
 	const char *failent_user = "UNKNOWN";
 	bool log_unkfail_enab = getdef_bool("LOG_UNKFAIL_ENAB");
 
-	if ((NULL != user) && ('\0' != user[0])) {
+	if ((NULL != user) && !streq(user, "")) {
 		if (   log_unkfail_enab
 		    || (getpwnam (user) != NULL)) {
 			failent_user = user;
@@ -589,13 +589,13 @@ int main (int argc, char **argv)
 
 	if (hflg) {
 		cp = hostname;
-	} else if ((host != NULL) && (host[0] != '\0')) {
+	} else if ((host != NULL) && !streq(host, "")) {
 		cp = host;
 	} else {
 		cp = "";
 	}
 
-	if ('\0' != *cp) {
+	if (!streq(cp, "")) {
 		SNPRINTF(fromhost, " on '%.100s' from '%.200s'", tty, cp);
 	} else {
 		SNPRINTF(fromhost, " on '%.100s'", tty);
@@ -925,7 +925,7 @@ int main (int argc, char **argv)
 			failed = true;
 		}
 		if (   !failed
-		    && !login_access (username, ('\0' != *hostname) ? hostname : tty)) {
+		    && !login_access(username, (!streq(hostname, "")) ? hostname : tty)) {
 			SYSLOG ((LOG_WARN, "LOGIN '%s' REFUSED %s",
 			         username, fromhost));
 			failed = true;

src/login_nopam.c

@@ -320,7 +320,7 @@ static bool from_match (const char *tok, const char *string)
 		if (strchr (string, '.') == NULL) {
 			return true;
 		}
-	} else if (   (tok[0] != '\0' && tok[(tok_len = strlen (tok)) - 1] == '.') /* network */
+	} else if (   (!streq(tok, "") && tok[(tok_len = strlen(tok)) - 1] == '.') /* network */
 		   && (strncmp (tok, resolve_hostname (string), tok_len) == 0)) {
 		return true;
 	}

src/newgrp.c

@@ -150,7 +150,7 @@ static void check_perms (const struct group *grp,
 		spw_free (spwd);
 	}
 
-	if (streq(pwd->pw_passwd, "") && (grp->gr_passwd[0] != '\0')) {
+	if (streq(pwd->pw_passwd, "") && !streq(grp->gr_passwd, "")) {
 		needspasswd = true;
 	}
 
@@ -786,7 +786,7 @@ int main (int argc, char **argv)
 	cp = getenv ("SHELL");
 	if (!initflag && (NULL != cp)) {
 		prog = cp;
-	} else if ((NULL != pwd->pw_shell) && ('\0' != pwd->pw_shell[0])) {
+	} else if ((NULL != pwd->pw_shell) && !streq(pwd->pw_shell, "")) {
 		prog = pwd->pw_shell;
 	} else {
 		prog = SHELL;

src/newusers.c

@@ -282,7 +282,7 @@ static int add_group (const char *name, const char *gid, gid_t *ngid, uid_t uid)
 	/*
 	 * Now I have all of the fields required to create the new group.
 	 */
-	if (('\0' != gid[0]) && (!isdigit (gid[0]))) {
+	if (!streq(gid, "") && (!isdigit(gid[0]))) {
 		grent.gr_name = xstrdup (gid);
 	} else {
 		grent.gr_name = xstrdup (name);
@@ -355,7 +355,7 @@ static int get_user_id (const char *uid, uid_t *nuid) {
 			return -1;
 		}
 	} else {
-		if ('\0' != uid[0]) {
+		if (!streq(uid, "")) {
 			const struct passwd *pwd;
 			/* local, no need for xgetpwnam */
 			pwd = getpwnam (uid);
@@ -1222,19 +1222,19 @@ int main (int argc, char **argv)
 			         Prog, line);
 			fail_exit (EXIT_FAILURE);
 		}
-		if ('\0' != fields[4][0]) {
+		if (!streq(fields[4], "")) {
 			newpw.pw_gecos = fields[4];
 		}
 
-		if ('\0' != fields[5][0]) {
+		if (!streq(fields[5], "")) {
 			newpw.pw_dir = fields[5];
 		}
 
-		if ('\0' != fields[6][0]) {
+		if (!streq(fields[6], "")) {
 			newpw.pw_shell = fields[6];
 		}
 
-		if (   ('\0' != fields[5][0])
+		if (   !streq(fields[5], "")
 		    && (access (newpw.pw_dir, F_OK) != 0)) {
 /* FIXME: should check for directory */
 			mode_t mode = getdef_num ("HOME_MODE",

src/passwd.c

@@ -194,7 +194,7 @@ static int new_password (const struct passwd *pw)
 	 * password.
 	 */
 
-	if (!amroot && ('\0' != crypt_passwd[0])) {
+	if (!amroot && !streq(crypt_passwd, "")) {
 		clear = agetpass (_("Old password: "));
 		if (NULL == clear) {
 			return -1;

src/pwck.c

@@ -533,7 +533,7 @@ static void check_pw_file (int *errors, bool *changed)
 		 * Make sure the login shell is executable
 		 */
 		if (   !quiet
-		    && ('\0' != pwd->pw_shell[0])
+		    && !streq(pwd->pw_shell, "")
 		    && (access (pwd->pw_shell, F_OK) != 0)) {
 
 			/*

src/su.c

@@ -1087,8 +1087,8 @@ int main (int argc, char **argv)
 	sulog (caller_tty, true, caller_name, name);	/* save SU information */
 	if (getdef_bool ("SYSLOG_SU_ENAB")) {
 		SYSLOG ((LOG_INFO, "+ %s %s:%s", caller_tty,
-		         ('\0' != caller_name[0]) ? caller_name : "???",
-		         ('\0' != name[0]) ? name : "???"));
+		         (!streq(caller_name, "")) ? caller_name : "???",
+		         (!streq(name, "")) ? name : "???"));
 	}
 
 #ifdef USE_PAM
@@ -1143,7 +1143,7 @@ int main (int argc, char **argv)
 				AUDIT_USER_ROLE_CHANGE,
 				NULL,    /* Prog. name */
 				"su",
-				('\0' != caller_name[0]) ? caller_name : "???",
+				(!streq(caller_name, "")) ? caller_name : "???",
 				AUDIT_NO_ID,
 				"localhost",
 				NULL,    /* addr */

src/useradd.c

@@ -177,7 +177,7 @@ static bool
     Uflg = false;		/* create a group having the same name as the user */
 
 #ifdef WITH_SELINUX
-#define Zflg ('\0' != *user_selinux)
+#define Zflg  (!streq(user_selinux, ""))
 #endif				/* WITH_SELINUX */
 
 static bool home_added = false;
@@ -1268,7 +1268,7 @@ static void process_flags (int argc, char **argv)
 				Dflg = true;
 				break;
 			case 'e':
-				if ('\0' != *optarg) {
+				if (!streq(optarg, "")) {
 					user_expire = strtoday (optarg);
 					if (user_expire < -1) {
 						fprintf (stderr,
@@ -1403,7 +1403,7 @@ static void process_flags (int argc, char **argv)
 				break;
 			case 's':
 				if (   ( !VALID (optarg) )
-				    || (   ('\0' != optarg[0])
+				    || (   !streq(optarg, "")
 				        && ('/'  != optarg[0])
 				        && ('*'  != optarg[0]) )) {
 					fprintf (stderr,
@@ -1411,7 +1411,7 @@ static void process_flags (int argc, char **argv)
 					         Prog, optarg);
 					exit (E_BAD_ARG);
 				}
-				if (    '\0' != optarg[0]
+				if (!streq(optarg, "")
 				     && '*'  != optarg[0]
 				     && !streq(optarg, "/sbin/nologin")
 				     && (   stat(optarg, &st) != 0

src/usermod.c

@@ -1154,7 +1154,7 @@ process_flags(int argc, char **argv)
 				break;
 			case 's':
 				if (   ( !VALID (optarg) )
-				    || (   ('\0' != optarg[0])
+				    || (   !streq(optarg, "")
 				        && ('/'  != optarg[0])
 				        && ('*'  != optarg[0]) )) {
 					fprintf (stderr,
@@ -1162,7 +1162,7 @@ process_flags(int argc, char **argv)
 					         Prog, optarg);
 					exit (E_BAD_ARG);
 				}
-				if (    '\0' != optarg[0]
+				if (!streq(optarg, "")
 				     && '*'  != optarg[0]
 				     && !streq(optarg, "/sbin/nologin")
 				     && (   stat(optarg, &st) != 0
@@ -2334,7 +2334,7 @@ int main (int argc, char **argv)
 
 #ifdef WITH_SELINUX
 	if (Zflg) {
-		if ('\0' != *user_selinux) {
+		if (!streq(user_selinux, "")) {
 			if (set_seuser (user_name, user_selinux, user_selinux_range) != 0) {
 				fprintf (stderr,
 				         _("%s: warning: the user name %s to %s SELinux user mapping failed.\n"),