lib/: Add ispfchar(), and use it instead of its pattern

lib/Makefile.am

@@ -191,14 +191,10 @@ libshadow_la_SOURCES = \
 	spawn.c \
 	sssd.c \
 	sssd.h \
-	string/ctype/strchrisascii/strchriscntrl.c \
-	string/ctype/strchrisascii/strchriscntrl.h \
-	string/ctype/strisascii/strisdigit.c \
-	string/ctype/strisascii/strisdigit.h \
-	string/ctype/strisascii/strisprint.c \
-	string/ctype/strisascii/strisprint.h \
-	string/ctype/strtoascii/strtolower.c \
-	string/ctype/strtoascii/strtolower.h \
+	string/ctype/isascii.c \
+	string/ctype/isascii.h \
+	string/ctype/toascii.c \
+	string/ctype/toascii.h \
 	string/memset/memzero.c \
 	string/memset/memzero.h \
 	string/sprintf/aprintf.c \

lib/chkname.c

@@ -33,8 +33,7 @@
 
 #include "defines.h"
 #include "chkname.h"
-#include "string/ctype/strchrisascii/strchriscntrl.h"
-#include "string/ctype/strisascii/strisdigit.h"
+#include "string/ctype/isascii.h"
 #include "string/strcmp/streq.h"
 #include "string/strcmp/strcaseeq.h"
 #include "sysconf.h"
@@ -51,8 +50,8 @@ is_valid_name(const char *name)
 	 || streq(name, "..")
 	 || strspn(name, "-")
 	 || strpbrk(name, " \"#',/:;")
-	 || strchriscntrl(name)
-	 || strisdigit(name))
+	 || strchriscntrl_c(name)
+	 || strisdigit_c(name))
 	{
 		errno = EINVAL;
 		return false;
@@ -70,26 +69,16 @@ is_valid_name(const char *name)
 	 * sake of Samba 3.x "add machine script"
 	 */
 
-	if (!((*name >= 'a' && *name <= 'z') ||
-	      (*name >= 'A' && *name <= 'Z') ||
-	      (*name >= '0' && *name <= '9') ||
-	      *name == '_' ||
-	      *name == '.'))
-	{
+	if (!ispfchar_c(*name)) {
 		errno = EILSEQ;
 		return false;
 	}
 
 	while (!streq(++name, "")) {
-		if (!((*name >= 'a' && *name <= 'z') ||
-		      (*name >= 'A' && *name <= 'Z') ||
-		      (*name >= '0' && *name <= '9') ||
-		      *name == '_' ||
-		      *name == '.' ||
-		      *name == '-' ||
-		      streq(name, "$")
-		     ))
-		{
+		if (streq(name, "$"))  // Samba
+			return true;
+
+		if (!ispfchar_c(*name)) {
 			errno = EILSEQ;
 			return false;
 		}

lib/fields.c

@@ -19,8 +19,7 @@
 
 #include "io/fgets/fgets.h"
 #include "prototypes.h"
-#include "string/ctype/strisascii/strisprint.h"
-#include "string/ctype/strchrisascii/strchriscntrl.h"
+#include "string/ctype/isascii.h"
 #include "string/strcmp/streq.h"
 #include "string/strspn/stpspn.h"
 #include "string/strspn/stprspn.h"
@@ -43,12 +42,12 @@ valid_field_(const char *field, const char *illegal)
 
 	if (strpbrk(field, illegal))
 		return -1;
-	if (strchriscntrl(field))
+	if (strchriscntrl_c(field))
 		return -1;
-	if (strisprint(field))
-		return 0;
 	if (streq(field, ""))
 		return 0;
+	if (strisprint_c(field))
+		return 0;
 
 	return 1;  // !ASCII
 }

lib/getrange.c

@@ -13,6 +13,7 @@
 #include "atoi/a2i.h"
 #include "defines.h"
 #include "prototypes.h"
+#include "string/ctype/isascii.h"
 #include "string/strcmp/streq.h"
 
 
@@ -57,7 +58,7 @@ getrange(const char *range,
 		if (streq(end, ""))
 			return 0;  /* <long>- */
 parse_max:
-		if (!isdigit((unsigned char) *end))
+		if (!isdigit_c(*end))
 			return -1;
 
 		if (a2ul(max, end, NULL, 10, *min, ULONG_MAX) == -1)

lib/obscure.c

@@ -19,7 +19,7 @@
 #include "prototypes.h"
 #include "defines.h"
 #include "getdef.h"
-#include "string/ctype/strtoascii/strtolower.h"
+#include "string/ctype/toascii.h"
 #include "string/memset/memzero.h"
 #include "string/sprintf/aprintf.h"
 #include "string/strcmp/streq.h"

lib/port.c

@@ -20,6 +20,7 @@
 #include "io/fgets/fgets.h"
 #include "port.h"
 #include "prototypes.h"
+#include "string/ctype/isascii.h"
 #include "string/strcmp/streq.h"
 #include "string/strcmp/strprefix.h"
 #include "string/strtok/stpsep.h"
@@ -212,7 +213,7 @@ getportent(void)
 		 * week or the other two values.
 		 */
 
-		for (i = 0; isalpha(cp[i]) && ('\0' != cp[i + 1]); i += 2) {
+		for (i = 0; isalpha_c(cp[i]) && ('\0' != cp[i + 1]); i += 2) {
 			switch ((cp[i] << 8) | (cp[i + 1])) {
 			case ('S' << 8) | 'u':
 				port.pt_times[j].t_days |= 01;
@@ -261,7 +262,7 @@ getportent(void)
 		 * representing the times of day.
 		 */
 
-		for (dtime = 0; isdigit (cp[i]); i++) {
+		for (dtime = 0; isdigit_c(cp[i]); i++) {
 			dtime = dtime * 10 + cp[i] - '0';
 		}
 
@@ -271,7 +272,7 @@ getportent(void)
 		port.pt_times[j].t_start = dtime;
 		cp = cp + i + 1;
 
-		for (dtime = 0, i = 0; isdigit (cp[i]); i++) {
+		for (dtime = 0, i = 0; isdigit_c(cp[i]); i++) {
 			dtime = dtime * 10 + cp[i] - '0';
 		}
 

lib/string/README

@@ -69,21 +69,26 @@ Specific guidelines:
 
 ctype/ - Character classification and conversion functions
 
-    strchrisascii/
-	The functions defined under this directory
+    isascii.h
+	The functions defined in this file
+	return true
+	if the character
+	belongs to the category specified in the function name.
+
+    strchrisascii.h
+	The functions defined in this file
 	return true
 	if the string has any characters that
 	belong to the category specified in the function name.
 
-    strisascii/
-	The functions defined under this directory
+    strisascii.h
+	The functions defined in this file
 	return true
 	if all of the characters of the string
-	belong to the category specified in the function name
-	and the string is not an empty string.
+	belong to the category specified in the function name.
 
-    strtoascii/
-	The functions defined under this directory
+    strtoascii.h
+	The functions defined in this file
 	translate all characters in a string.
 
 memset/ - Memory zeroing

lib/string/ctype/isascii.c

@@ -0,0 +1,7 @@
+// SPDX-FileCopyrightText: 2024-2025, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#include "config.h"
+
+#include "string/ctype/isascii.h"

lib/string/ctype/isascii.h

@@ -0,0 +1,61 @@
+// SPDX-FileCopyrightText: 2024-2025, Alejandro Colomar <alx@kernel.org>
+// SPDX-License-Identifier: BSD-3-Clause
+
+
+#ifndef SHADOW_INCLUDE_LIB_STRING_CTYPE_ISASCII_H_
+#define SHADOW_INCLUDE_LIB_STRING_CTYPE_ISASCII_H_
+
+
+#include "config.h"
+
+#include <string.h>
+
+#include "string/strcmp/streq.h"
+#include "string/strspn/stpspn.h"
+
+
+#define CTYPE_CNTRL_C                                                 \
+	"\x7F"                                                        \
+	"\x1F\x1E\x1D\x1C\x1B\x1A\x19\x18\x17\x16\x15\x14\x13\x12\x11\x10" \
+	"\x0F\x0E\x0D\x0C\x0B\x0A\x09\x08\x07\x06\x05\x04\x03\x02\x01" /*NUL*/
+
+#define CTYPE_LOWER_C     "abcdefghijklmnopqrstuvwxyz"
+#define CTYPE_UPPER_C     "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+#define CTYPE_DIGIT_C     "0123456789"
+#define CTYPE_PUNCT_C     "!\"#$%&'()*+,-./:;<=>?@[\\]^_`{|}~"
+#define CTYPE_SPACE_C     " \t\n\v\f\r"
+#define CTYPE_ALPHA_C     CTYPE_LOWER_C CTYPE_UPPER_C
+#define CTYPE_ALNUM_C     CTYPE_ALPHA_C CTYPE_DIGIT_C
+#define CTYPE_GRAPH_C     CTYPE_ALNUM_C CTYPE_PUNCT_C
+#define CTYPE_PRINT_C     CTYPE_GRAPH_C " "
+#define CTYPE_XDIGIT_C    CTYPE_DIGIT_C "abcdefABCDEF"
+#define CTYPE_ASCII_C     CTYPE_PRINT_C CTYPE_CNTRL_C /*NUL*/
+#define CTYPE_PFCHAR_C    CTYPE_ALNUM_C "._-"  // portable filename character set
+
+
+// isascii_c - is [:ascii:] C-locale
+#define isascii_c(c)      (!!strchr(CTYPE_ASCII_C, c))
+#define iscntrl_c(c)      (!!strchr(CTYPE_CNTRL_C, c))
+#define islower_c(c)      (!streq(strchrnul(CTYPE_LOWER_C, c), ""))
+#define isupper_c(c)      (!streq(strchrnul(CTYPE_UPPER_C, c), ""))
+#define isdigit_c(c)      (!streq(strchrnul(CTYPE_DIGIT_C, c), ""))
+#define ispunct_c(c)      (!streq(strchrnul(CTYPE_PUNCT_C, c), ""))
+#define isspace_c(c)      (!streq(strchrnul(CTYPE_SPACE_C, c), ""))
+#define isalpha_c(c)      (!streq(strchrnul(CTYPE_ALPHA_C, c), ""))
+#define isalnum_c(c)      (!streq(strchrnul(CTYPE_ALNUM_C, c), ""))
+#define isgraph_c(c)      (!streq(strchrnul(CTYPE_GRAPH_C, c), ""))
+#define isprint_c(c)      (!streq(strchrnul(CTYPE_PRINT_C, c), ""))
+#define isxdigit_c(c)     (!streq(strchrnul(CTYPE_XDIGIT_C, c), ""))
+#define ispfchar_c(c)     (!streq(strchrnul(CTYPE_PFCHAR_C, c), ""))
+
+
+// strisascii_c - string is [:ascii:] C-locale
+#define strisdigit_c(s)   streq(stpspn(s, CTYPE_DIGIT_C), "")
+#define strisprint_c(s)   streq(stpspn(s, CTYPE_PRINT_C), "")
+
+
+// strchriscntrl_c - string character is [:cntrl:] C-locale
+#define strchriscntrl_c(s)  (!!strpbrk(s, CTYPE_CNTRL_C))
+
+
+#endif  // include guard