lib/: Use strisdigit() instead of its pattern

Note that the old code in

	(1)  lib/strtoday.c:strtoday()
	(2)  lib/subordinateio.c:append_uids()

was considering an empty string as if it were a number.
strisdigit() does not consider an empty string to be numeric.

I think it will not affect the behavior in either case, as they should
sooner or later result in an error somewhere.  And it seems (IMO)
surprising to treat empty strings as numeric strings, so let's not do
it.

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

lib/chkname.c

@@ -33,6 +33,7 @@
 
 #include "defines.h"
 #include "chkname.h"
+#include "string/ctype/strisdigit.h"
 #include "string/strcmp/streq.h"
 
 
@@ -69,7 +70,11 @@ is_valid_name(const char *name)
          *
          * Also do not allow fully numeric names or just "." or "..".
          */
-	int numeric;
+
+	if (strisdigit(name)) {
+		errno = EINVAL;
+		return false;
+	}
 
 	if ('\0' == *name ||
 	    ('.' == *name && (('.' == name[1] && '\0' == name[2]) ||
@@ -84,8 +89,6 @@ is_valid_name(const char *name)
 		return false;
 	}
 
-	numeric = isdigit(*name);
-
 	while (!streq(++name, "")) {
 		if (!((*name >= 'a' && *name <= 'z') ||
 		      (*name >= 'A' && *name <= 'Z') ||
@@ -99,12 +102,6 @@ is_valid_name(const char *name)
 			errno = EINVAL;
 			return false;
 		}
-		numeric &= isdigit(*name);
-	}
-
-	if (numeric) {
-		errno = EINVAL;
-		return false;
 	}
 
 	return true;

lib/strtoday.c

@@ -14,6 +14,7 @@
 #include "atoi/str2i/str2s.h"
 #include "getdate.h"
 #include "prototypes.h"
+#include "string/ctype/strisdigit.h"
 #include "string/strchr/stpspn.h"
 #include "string/strcmp/streq.h"
 
@@ -35,7 +36,6 @@
 long strtoday (const char *str)
 {
 	time_t t;
-	bool isnum = true;
 	const char *s = str;
 
 	/*
@@ -54,14 +54,9 @@ long strtoday (const char *str)
 		s++;
 	}
 	s = stpspn(s, " ");
-	while (isnum && !streq(s, "")) {
-		if (!isdigit (*s)) {
-			isnum = false;
-		}
-		s++;
-	}
-	if (isnum) {
+	if (strisdigit(s)) {
 		long retdate;
+
 		if (str2sl(&retdate, str) == -1)
 			return -2;
 		return retdate;

lib/subordinateio.c

@@ -22,6 +22,7 @@
 #include "alloc/realloc.h"
 #include "alloc/reallocf.h"
 #include "atoi/str2i/str2u.h"
+#include "string/ctype/strisdigit.h"
 #include "string/sprintf/snprintf.h"
 #include "string/strcmp/streq.h"
 
@@ -926,22 +927,12 @@ int list_owner_ranges(const char *owner, enum subid_type id_type, struct subid_r
 	return count;
 }
 
-static bool all_digits(const char *str)
-{
-	int i;
-
-	for (i = 0; str[i] != '\0'; i++)
-		if (!isdigit(str[i]))
-			return false;
-	return true;
-}
-
 static int append_uids(uid_t **uids, const char *owner, int n)
 {
 	int    i;
 	uid_t  owner_uid;
 
-	if (all_digits(owner)) {
+	if (strisdigit(owner)) {
 		i = sscanf(owner, "%d", &owner_uid);
 		if (i != 1) {
 			// should not happen