gh-108767: Replace ctype.h functions with pyctype.h functions (#108772)

Replace <ctype.h> locale dependent functions with Python "pyctype.h"
locale independent functions:

* Replace isalpha() with Py_ISALPHA().
* Replace isdigit() with Py_ISDIGIT().
* Replace isxdigit() with Py_ISXDIGIT().
* Replace tolower() with Py_TOLOWER().

Leave Modules/_sre/sre.c unchanged, it uses locale dependent
functions on purpose.

Include explicitly <ctype.h> in _decimal.c to get isascii().

3 files changed, 10 insertions, 9 deletions

diff --git a/Modules/_decimal/_decimal.c b/Modules/_decimal/_decimal.c
index 585214c..b49ea3c 100644
--- a/Modules/_decimal/_decimal.c
+++ b/Modules/_decimal/_decimal.c
@@ -35,6 +35,7 @@
 #include "complexobject.h"
 #include "mpdecimal.h"
 
+#include <ctype.h>                // isascii()
 #include <stdlib.h>
 
 #include "docstrings.h"
diff --git a/Modules/_zoneinfo.c b/Modules/_zoneinfo.c
index 09f5fd4..3f7b285 100644
--- a/Modules/_zoneinfo.c
+++ b/Modules/_zoneinfo.c
@@ -1701,7 +1701,7 @@ error:
 static int
 parse_uint(const char *const p, uint8_t *value)
 {
-    if (!isdigit(*p)) {
+    if (!Py_ISDIGIT(*p)) {
         return -1;
     }
 
@@ -1732,7 +1732,7 @@ parse_abbr(const char *const p, PyObject **abbr)
             //   '+' ) character, or the minus-sign ( '-' ) character. The std
             //   and dst fields in this case shall not include the quoting
             //   characters.
-            if (!isalpha(buff) && !isdigit(buff) && buff != '+' &&
+            if (!Py_ISALPHA(buff) && !Py_ISDIGIT(buff) && buff != '+' &&
                 buff != '-') {
                 return -1;
             }
@@ -1748,7 +1748,7 @@ parse_abbr(const char *const p, PyObject **abbr)
         //   In the unquoted form, all characters in these fields shall be
         //   alphabetic characters from the portable character set in the
         //   current locale.
-        while (isalpha(*ptr)) {
+        while (Py_ISALPHA(*ptr)) {
             ptr++;
         }
         str_end = ptr;
@@ -1802,7 +1802,7 @@ parse_tz_delta(const char *const p, long *total_seconds)
     // The hour can be 1 or 2 numeric characters
     for (size_t i = 0; i < 2; ++i) {
         buff = *ptr;
-        if (!isdigit(buff)) {
+        if (!Py_ISDIGIT(buff)) {
             if (i == 0) {
                 return -1;
             }
@@ -1830,7 +1830,7 @@ parse_tz_delta(const char *const p, long *total_seconds)
 
         for (size_t j = 0; j < 2; ++j) {
             buff = *ptr;
-            if (!isdigit(buff)) {
+            if (!Py_ISDIGIT(buff)) {
                 return -1;
             }
             *(outputs[i]) *= 10;
@@ -1932,7 +1932,7 @@ parse_transition_rule(const char *const p, TransitionRuleType **out)
         }
 
         for (size_t i = 0; i < 3; ++i) {
-            if (!isdigit(*ptr)) {
+            if (!Py_ISDIGIT(*ptr)) {
                 if (i == 0) {
                     return -1;
                 }
@@ -2007,7 +2007,7 @@ parse_transition_time(const char *const p, int8_t *hour, int8_t *minute,
 
         uint8_t buff = 0;
         for (size_t j = 0; j < 2; j++) {
-            if (!isdigit(*ptr)) {
+            if (!Py_ISDIGIT(*ptr)) {
                 if (i == 0 && j > 0) {
                     break;
                 }
diff --git a/Modules/getaddrinfo.c b/Modules/getaddrinfo.c
index f1c28d7..6fb6062 100644
--- a/Modules/getaddrinfo.c
+++ b/Modules/getaddrinfo.c
@@ -51,7 +51,6 @@
 #include <string.h>
 #include <stdlib.h>
 #include <stddef.h>
-#include <ctype.h>
 #include <unistd.h>
 
 #include "addrinfo.h"
@@ -228,8 +227,9 @@ str_isnumber(const char *p)
 {
     unsigned char *q = (unsigned char *)p;
     while (*q) {
-        if (! isdigit(*q))
+        if (!Py_ISDIGIT(*q)) {
             return NO;
+        }
         q++;
     }
     return YES;