Support glob pattern for epicsEnvShow

Add epicsStrnGlobMatch with tests

modules/libcom/src/misc/epicsString.c

@@ -23,6 +23,15 @@
 #include <errno.h>
 #include <ctype.h>
 
+#ifndef vxWorks
+#include <stdint.h>
+#else
+/* VxWorks automaticaly includes stdint.h defining SIZE_MAX in 6.9 but not earlier */
+#ifndef SIZE_MAX
+#define SIZE_MAX (size_t)-1
+#endif
+#endif
+
 #include "epicsAssert.h"
 #include "epicsStdio.h"
 #include "cantProceed.h"
@@ -259,30 +268,31 @@ size_t epicsStrnLen(const char *s, size_t maxlen)
     return i;
 }
 
-int epicsStrGlobMatch(const char *str, const char *pattern)
+int epicsStrnGlobMatch(const char *str, size_t len, const char *pattern)
 {
-    const char *cp = NULL, *mp = NULL;
+    const char *mp = NULL;
+    size_t cp = 0, i = 0;
 
-    while ((*str) && (*pattern != '*')) {
-        if ((*pattern != *str) && (*pattern != '?'))
+    while ((i < len) && (str[i]) && (*pattern != '*')) {
+        if ((*pattern != str[i]) && (*pattern != '?'))
             return 0;
         pattern++;
-        str++;
+        i++;
     }
-    while (*str) {
+    while ((i < len) && str[i]) {
         if (*pattern == '*') {
             if (!*++pattern)
                 return 1;
             mp = pattern;
-            cp = str+1;
+            cp = i+1;
         }
-        else if ((*pattern == *str) || (*pattern == '?')) {
+        else if ((*pattern == str[i]) || (*pattern == '?')) {
             pattern++;
-            str++;
+            i++;
         }
         else {
             pattern = mp;
-            str = cp++;
+            i = cp++;
         }
     }
     while (*pattern == '*')
@@ -290,6 +300,10 @@ int epicsStrGlobMatch(const char *str, const char *pattern)
     return !*pattern;
 }
 
+int epicsStrGlobMatch(const char *str, const char *pattern) {
+    return epicsStrnGlobMatch(str, SIZE_MAX, pattern);
+}
+
 char * epicsStrtok_r(char *s, const char *delim, char **lasts)
 {
    const char *spanp;

modules/libcom/src/misc/epicsString.h

@@ -36,7 +36,30 @@ LIBCOM_API char * epicsStrnDup(const char *s, size_t len);
 LIBCOM_API int epicsStrPrintEscaped(FILE *fp, const char *s, size_t n);
 #define epicsStrSnPrintEscaped epicsStrnEscapedFromRaw
 LIBCOM_API size_t epicsStrnLen(const char *s, size_t maxlen);
+
+/** Matches a string against a pattern.
+ *
+ * Checks if str matches the glob style pattern, which may contain ? or * wildcards.
+ * A ? matches any single character.
+ * A * matched any sub-string.
+ *
+ * @returns 1 if str matches the pattern, 0 if not.
+ *
+ * @since EPICS 3.14.7
+ */
 LIBCOM_API int epicsStrGlobMatch(const char *str, const char *pattern);
+
+/** Matches a string against a pattern.
+ *
+ * Like epicsStrGlobMatch but with limited string length.
+ * If the length of str is less than len, the full string is matched.
+ *
+ * @returns 1 if the first len characters of str match the pattern, 0 if not.
+ *
+ * @since UNRELEASED
+ */
+LIBCOM_API int epicsStrnGlobMatch(const char *str, size_t len, const char *pattern);
+
 LIBCOM_API char * epicsStrtok_r(char *s, const char *delim, char **lasts);
 LIBCOM_API unsigned int epicsStrHash(const char *str, unsigned int seed);
 LIBCOM_API unsigned int epicsMemHash(const char *str, size_t length,