[gtk/matthiasc/for-master: 1/2] fnmatch: Support case-folding

[Matthias Clasen <matthiasc src gnome org>]

commit bb53cf53e7c683c667a9e47324360d2414fcf0bc
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jun 3 23:55:30 2021 -0400

    fnmatch: Support case-folding
    
    This will be used in GtkFileFilter in the future.
    
    Update all callers.

 gtk/fnmatch.c       | 51 +++++++++++++++++++++++++++------------------------
 gtk/gtkfilefilter.c |  2 +-
 gtk/gtkprivate.h    |  3 ++-
 3 files changed, 30 insertions(+), 26 deletions(-)
---
diff --git a/gtk/fnmatch.c b/gtk/fnmatch.c
index fada2b7229..ba661afbbe 100644
--- a/gtk/fnmatch.c
+++ b/gtk/fnmatch.c
@@ -36,14 +36,14 @@
 #include <glib.h>
 
 static gunichar
-get_char (const char **str)
+get_char (const char **str,
+          gboolean     casefold)
 {
   gunichar c = g_utf8_get_char (*str);
   *str = g_utf8_next_char (*str);
 
-#ifdef G_PLATFORM_WIN32
-  c = g_unichar_tolower (c);
-#endif
+  if (casefold)
+    c = g_unichar_tolower (c);
 
   return c;
 }
@@ -56,13 +56,14 @@ get_char (const char **str)
 
 static gunichar
 get_unescaped_char (const char **str,
-                   gboolean    *was_escaped)
+                   gboolean    *was_escaped,
+                    gboolean     casefold)
 {
-  gunichar c = get_char (str);
+  gunichar c = get_char (str, casefold);
 
   *was_escaped = DO_ESCAPE && c == '\\';
   if (*was_escaped)
-    c = get_char (str);
+    c = get_char (str, casefold);
   
   return c;
 }
@@ -74,7 +75,8 @@ static gboolean
 gtk_fnmatch_intern (const char *pattern,
                    const char *string,
                    gboolean    component_start,
-                   gboolean    no_leading_period)
+                   gboolean    no_leading_period,
+                    gboolean    casefold)
 {
   const char *p = pattern, *n = string;
   
@@ -82,8 +84,8 @@ gtk_fnmatch_intern (const char *pattern,
     {
       const char *last_n = n;
       
-      gunichar c = get_char (&p);
-      gunichar nc = get_char (&n);
+      gunichar c = get_char (&p, casefold);
+      gunichar nc = get_char (&n, casefold);
       
       switch (c)
        {
@@ -97,7 +99,7 @@ gtk_fnmatch_intern (const char *pattern,
          break;
        case '\\':
          if (DO_ESCAPE)
-           c = get_char (&p);
+           c = get_char (&p, casefold);
          if (nc != c)
            return FALSE;
          break;
@@ -108,9 +110,9 @@ gtk_fnmatch_intern (const char *pattern,
          {
            const char *last_p;
 
-           for (last_p = p, c = get_char (&p);
+           for (last_p = p, c = get_char (&p, casefold);
                 c == '?' || c == '*';
-                last_p = p, c = get_char (&p))
+                last_p = p, c = get_char (&p, casefold))
              {
                if (c == '?')
                  {
@@ -120,7 +122,7 @@ gtk_fnmatch_intern (const char *pattern,
                      return FALSE;
                    else
                      {
-                       last_n = n; nc = get_char (&n);
+                       last_n = n; nc = get_char (&n, casefold);
                      }
                  }
              }
@@ -138,17 +140,17 @@ gtk_fnmatch_intern (const char *pattern,
              }
 
            if (DO_ESCAPE && c == '\\')
-             c = get_char (&p);
+             c = get_char (&p, casefold);
 
            for (p = last_p; nc != '\0';)
              {
                if ((c == '[' || nc == c) &&
-                   gtk_fnmatch_intern (p, last_n, component_start, no_leading_period))
+                   gtk_fnmatch_intern (p, last_n, component_start, no_leading_period, casefold))
                  return TRUE;
                
                component_start = (nc == G_DIR_SEPARATOR);
                last_n = n;
-               nc = get_char (&n);
+               nc = get_char (&n, casefold);
              }
                  
            return FALSE;
@@ -170,7 +172,7 @@ gtk_fnmatch_intern (const char *pattern,
            if (not)
              ++p;
 
-           c = get_unescaped_char (&p, &was_escaped);
+           c = get_unescaped_char (&p, &was_escaped, casefold);
            for (;;)
              {
                register gunichar cstart = c, cend = c;
@@ -178,15 +180,15 @@ gtk_fnmatch_intern (const char *pattern,
                  /* [ (unterminated) loses.  */
                  return FALSE;
 
-               c = get_unescaped_char (&p, &was_escaped);
+               c = get_unescaped_char (&p, &was_escaped, casefold);
                
                if (!was_escaped && c == '-' && *p != ']')
                  {
-                   cend = get_unescaped_char (&p, &was_escaped);
+                   cend = get_unescaped_char (&p, &was_escaped, casefold);
                    if (cend == '\0')
                      return FALSE;
 
-                   c = get_char (&p);
+                   c = get_char (&p, casefold);
                  }
 
                if (nc >= cstart && nc <= cend)
@@ -208,7 +210,7 @@ gtk_fnmatch_intern (const char *pattern,
                  /* [... (unterminated) loses.  */
                  return FALSE;
 
-               c = get_unescaped_char (&p, &was_escaped);
+               c = get_unescaped_char (&p, &was_escaped, casefold);
              }
            if (not)
              return FALSE;
@@ -246,9 +248,10 @@ gtk_fnmatch_intern (const char *pattern,
 gboolean
 _gtk_fnmatch (const char *pattern,
              const char *string,
-             gboolean no_leading_period)
+             gboolean no_leading_period,
+              gboolean casefold)
 {
-  return gtk_fnmatch_intern (pattern, string, TRUE, no_leading_period);
+  return gtk_fnmatch_intern (pattern, string, TRUE, no_leading_period, casefold);
 }
 
 #undef FNMATCH_TEST_CASES
diff --git a/gtk/gtkfilefilter.c b/gtk/gtkfilefilter.c
index ed933fd030..99a82d6845 100644
--- a/gtk/gtkfilefilter.c
+++ b/gtk/gtkfilefilter.c
@@ -804,7 +804,7 @@ gtk_file_filter_match (GtkFilter *filter,
             display_name = g_file_info_get_display_name (info);
             if (display_name)
               {
-                if (_gtk_fnmatch (rule->u.pattern, display_name, FALSE))
+                if (_gtk_fnmatch (rule->u.pattern, display_name, FALSE, FALSE))
                   return TRUE;
               }
           }
diff --git a/gtk/gtkprivate.h b/gtk/gtkprivate.h
index ff3e188eef..d24c272065 100644
--- a/gtk/gtkprivate.h
+++ b/gtk/gtkprivate.h
@@ -61,7 +61,8 @@ const char * _gtk_get_data_prefix        (void);
 
 gboolean      _gtk_fnmatch                (const char *pattern,
                                            const char *string,
-                                           gboolean    no_leading_period);
+                                           gboolean    no_leading_period,
+                                           gboolean    casefold);
 
 char        * _gtk_get_lc_ctype           (void);