Documentation/SubmittingPatches: unify whitespace/tabs for the DCO

diff --git a/utf8.c b/utf8.c
index b30790d043aa4b01da00686654dfb615a92e75b6..9a3f4ad23293bf6a3fc06a1942fd324fa1b74ded 100644 (file)
--- a/utf8.c
+++ b/utf8.c
@@ -239,13 +239,6 @@ int is_utf8(const char *text)
        return 1;
 }
 
-static void strbuf_addchars(struct strbuf *sb, int c, size_t n)
-{
-       strbuf_grow(sb, n);
-       memset(sb->buf + sb->len, c, n);
-       strbuf_setlen(sb, sb->len + n);
-}
-
 static void strbuf_add_indented_text(struct strbuf *buf, const char *text,
                                     int indent, int indent2)
 {
@@ -382,6 +375,9 @@ void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
                        dst += n;
                }
 
+               if (src >= end)
+                       break;
+
                old = src;
                n = utf8_width((const char**)&src, NULL);
                if (!src)       /* broken utf-8, do nothing */
@@ -565,3 +561,67 @@ int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding)
 
        return chrlen;
 }
+
+/*
+ * Pick the next char from the stream, folding as an HFS+ filename comparison
+ * would. Note that this is _not_ complete by any means. It's just enough
+ * to make is_hfs_dotgit() work, and should not be used otherwise.
+ */
+static ucs_char_t next_hfs_char(const char **in)
+{
+       while (1) {
+               ucs_char_t out = pick_one_utf8_char(in, NULL);
+               /*
+                * check for malformed utf8. Technically this
+                * gets converted to a percent-sequence, but
+                * returning 0 is good enough for is_hfs_dotgit
+                * to realize it cannot be .git
+                */
+               if (!*in)
+                       return 0;
+
+               /* these code points are ignored completely */
+               switch (out) {
+               case 0x200c: /* ZERO WIDTH NON-JOINER */
+               case 0x200d: /* ZERO WIDTH JOINER */
+               case 0x200e: /* LEFT-TO-RIGHT MARK */
+               case 0x200f: /* RIGHT-TO-LEFT MARK */
+               case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */
+               case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */
+               case 0x202c: /* POP DIRECTIONAL FORMATTING */
+               case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */
+               case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */
+               case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */
+               case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */
+               case 0x206c: /* INHIBIT ARABIC FORM SHAPING */
+               case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */
+               case 0x206e: /* NATIONAL DIGIT SHAPES */
+               case 0x206f: /* NOMINAL DIGIT SHAPES */
+               case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */
+                       continue;
+               }
+
+               /*
+                * there's a great deal of other case-folding that occurs,
+                * but this is enough to catch anything that will convert
+                * to ".git"
+                */
+               return tolower(out);
+       }
+}
+
+int is_hfs_dotgit(const char *path)
+{
+       ucs_char_t c;
+
+       if (next_hfs_char(&path) != '.' ||
+           next_hfs_char(&path) != 'g' ||
+           next_hfs_char(&path) != 'i' ||
+           next_hfs_char(&path) != 't')
+               return 0;
+       c = next_hfs_char(&path);
+       if (c && !is_dir_sep(c))
+               return 0;
+
+       return 1;
+}