Squashed 'third_party/git/' content from commit cb71568594

git-subtree-dir: third_party/git
git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7

utf8.h

@@ -0,0 +1,108 @@
+#ifndef GIT_UTF8_H
+#define GIT_UTF8_H
+
+struct strbuf;
+
+typedef unsigned int ucs_char_t;  /* assuming 32bit int */
+
+size_t display_mode_esc_sequence_len(const char *s);
+int utf8_width(const char **start, size_t *remainder_p);
+int utf8_strnwidth(const char *string, int len, int skip_ansi);
+int utf8_strwidth(const char *string);
+int is_utf8(const char *text);
+int is_encoding_utf8(const char *name);
+int same_encoding(const char *, const char *);
+__attribute__((format (printf, 2, 3)))
+int utf8_fprintf(FILE *, const char *, ...);
+
+extern const char utf8_bom[];
+int skip_utf8_bom(char **, size_t);
+
+void strbuf_add_wrapped_text(struct strbuf *buf,
+		const char *text, int indent, int indent2, int width);
+void strbuf_add_wrapped_bytes(struct strbuf *buf, const char *data, int len,
+			     int indent, int indent2, int width);
+void strbuf_utf8_replace(struct strbuf *sb, int pos, int width,
+			 const char *subst);
+
+#ifndef NO_ICONV
+char *reencode_string_iconv(const char *in, size_t insz,
+			    iconv_t conv, size_t bom_len, size_t *outsz);
+char *reencode_string_len(const char *in, size_t insz,
+			  const char *out_encoding,
+			  const char *in_encoding,
+			  size_t *outsz);
+#else
+static inline char *reencode_string_len(const char *a, size_t b,
+					const char *c, const char *d, size_t *e)
+{ if (e) *e = 0; return NULL; }
+#endif
+
+static inline char *reencode_string(const char *in,
+				    const char *out_encoding,
+				    const char *in_encoding)
+{
+	return reencode_string_len(in, strlen(in),
+				   out_encoding, in_encoding,
+				   NULL);
+}
+
+int mbs_chrlen(const char **text, size_t *remainder_p, const char *encoding);
+
+/*
+ * Returns true if the path would match ".git" after HFS case-folding.
+ * The path should be NUL-terminated, but we will match variants of both ".git\0"
+ * and ".git/..." (but _not_ ".../.git"). This makes it suitable for both fsck
+ * and verify_path().
+ *
+ * Likewise, the is_hfs_dotgitfoo() variants look for ".gitfoo".
+ */
+int is_hfs_dotgit(const char *path);
+int is_hfs_dotgitmodules(const char *path);
+int is_hfs_dotgitignore(const char *path);
+int is_hfs_dotgitattributes(const char *path);
+
+typedef enum {
+	ALIGN_LEFT,
+	ALIGN_MIDDLE,
+	ALIGN_RIGHT
+} align_type;
+
+/*
+ * Align the string given and store it into a strbuf as per the
+ * 'position' and 'width'. If the given string length is larger than
+ * 'width' than then the input string is not truncated and no
+ * alignment is done.
+ */
+void strbuf_utf8_align(struct strbuf *buf, align_type position, unsigned int width,
+		       const char *s);
+
+/*
+ * If a data stream is declared as UTF-16BE or UTF-16LE, then a UTF-16
+ * BOM must not be used [1]. The same applies for the UTF-32 equivalents.
+ * The function returns true if this rule is violated.
+ *
+ * [1] http://unicode.org/faq/utf_bom.html#bom10
+ */
+int has_prohibited_utf_bom(const char *enc, const char *data, size_t len);
+
+/*
+ * If the endianness is not defined in the encoding name, then we
+ * require a BOM. The function returns true if a required BOM is missing.
+ *
+ * The Unicode standard instructs to assume big-endian if there in no
+ * BOM for UTF-16/32 [1][2]. However, the W3C/WHATWG encoding standard
+ * used in HTML5 recommends to assume little-endian to "deal with
+ * deployed content" [3].
+ *
+ * Therefore, strictly requiring a BOM seems to be the safest option for
+ * content in Git.
+ *
+ * [1] http://unicode.org/faq/utf_bom.html#gen6
+ * [2] http://www.unicode.org/versions/Unicode10.0.0/ch03.pdf
+ *     Section 3.10, D98, page 132
+ * [3] https://encoding.spec.whatwg.org/#utf-16le
+ */
+int is_missing_required_utf_bom(const char *enc, const char *data, size_t len);
+
+#endif