contrib/, lib/, src/: Use consistent style using strchr(3) in conditionals

While the return value is a pointer, it can be interpreted as a boolean
value meaning "found".  In general, we use explicit comparisons of
pointers to NULL, but in this specific case, let's use that
interpretation, and make an exception, using an implicit conversion to
boolean.

For negative matches, use
	if (!strchr(...))

For positive matches, use
	if (strchr(...))

For positive matches, when a variable is also set, use
	while (NULL != (p = strchr(...)))

Signed-off-by: Alejandro Colomar <[email protected]>

Author: alejandro-colomar

contrib/adduser.c

@@ -225,7 +225,7 @@ main (void)
 	      printf ("That name is in use, choose another.\n");
 	      done = 0;
 	    }
-	  else if (strchr (usrname, ' ') != NULL)
+	  else if (strchr(usrname, ' '))
 	    {
 	      printf ("No spaces in username!!\n");
 	      done = 0;

lib/env.c

@@ -226,9 +226,9 @@ void sanitize_env (void)
 			if (!strprefix(*cur, *bad)) {
 				continue;
 			}
-			if (strchr (*cur, '/') == NULL) {
+			if (!strchr(*cur, '/'))
 				continue;	/* OK */
-			}
+
 			for (move = cur; NULL != *move; move++) {
 				*move = *(move + 1);
 			}

lib/obscure.c

@@ -14,6 +14,7 @@
 
 #include <ctype.h>
 #include <stdio.h>
+#include <string.h>
 
 #include "attr.h"
 #include "prototypes.h"
@@ -66,9 +67,8 @@ static bool similar (/*@notnull@*/const char *old, /*@notnull@*/const char *new)
 	}
 
 	for (i = j = 0; ('\0' != new[i]) && ('\0' != old[i]); i++) {
-		if (strchr (new, old[i]) != NULL) {
+		if (strchr(new, old[i]))
 			j++;
-		}
 	}
 
 	if (i >= j * 2) {

lib/setupenv.c

@@ -235,7 +235,7 @@ void setup_env (struct passwd *info)
 	if (NULL == cp) {
 		/* not specified, use a minimal default */
 		addenv ((info->pw_uid == 0) ? "PATH=/sbin:/bin:/usr/sbin:/usr/bin" : "PATH=/bin:/usr/bin", NULL);
-	} else if (strchr (cp, '=')) {
+	} else if (strchr(cp, '=')) {
 		/* specified as name=value (PATH=...) */
 		addenv (cp, NULL);
 	} else {

lib/tcbfuncs.c

@@ -191,7 +191,7 @@ static shadowtcb_status mkdir_leading (const char *name, uid_t uid)
 		         shadow_progname, TCB_DIR, strerror (errno));
 		goto out_free_path;
 	}
-	while ((ind = strchr (ptr, '/'))) {
+	while (NULL != (ind = strchr(ptr, '/'))) {
 		stpcpy(ind, "");
 		if (asprintf (&dir, TCB_DIR "/%s", path) == -1) {
 			OUT_OF_MEMORY;

src/chfn.c

@@ -15,6 +15,7 @@
 #include <pwd.h>
 #include <signal.h>
 #include <stdio.h>
+#include <string.h>
 #include <sys/types.h>
 #include <getopt.h>
 
@@ -159,9 +160,8 @@ static bool may_change_field (int field)
 		cp = "frwh";
 	}
 
-	if (strchr (cp, field) != NULL) {
+	if (strchr(cp, field))
 		return true;
-	}
 
 	return false;
 }

src/chpasswd.c

@@ -17,6 +17,7 @@
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #ifdef USE_PAM
 #include "pam_defs.h"
@@ -509,10 +510,8 @@ int main (int argc, char **argv)
 			if (feof (stdin) == 0) {
 				// Drop all remaining characters on this line.
 				while (fgets (buf, sizeof buf, stdin) != NULL) {
-					cp = strchr (buf, '\n');
-					if (cp != NULL) {
+					if (strchr(buf, '\n'))
 						break;
-					}
 				}
 
 				fprintf (stderr,

src/login_nopam.c

@@ -314,9 +314,8 @@ static bool from_match (char *tok, const char *string)
 			return true;
 		}
 	} else if (strcaseeq(tok, "LOCAL")) {	/* LOCAL: no dots */
-		if (strchr (string, '.') == NULL) {
+		if (!strchr(string, '.'))
 			return true;
-		}
 	} else if (   (!streq(tok, "") && tok[strlen(tok) - 1] == '.') /* network */
 		   && strprefix(resolve_hostname(string), tok)) {
 		return true;

src/su.c

@@ -951,7 +951,7 @@ static void set_environment (struct passwd *pw)
 	cp = getdef_str ((pw->pw_uid == 0) ? "ENV_SUPATH" : "ENV_PATH");
 	if (NULL == cp) {
 		addenv ((pw->pw_uid == 0) ? "PATH=/sbin:/bin:/usr/sbin:/usr/bin" : "PATH=/bin:/usr/bin", NULL);
-	} else if (strchr (cp, '=') != NULL) {
+	} else if (strchr(cp, '=')) {
 		addenv (cp, NULL);
 	} else {
 		addenv ("PATH", cp);