+ const char *local_start;
+ int local_sz;
+ char term;
+ enum mandoc_esc gly;
+
+ /*
+ * When the caller doesn't provide return storage,
+ * use local storage.
+ */
+
+ if (NULL == start)
+ start = &local_start;
+ if (NULL == sz)
+ sz = &local_sz;
+
+ /*
+ * Beyond the backslash, at least one input character
+ * is part of the escape sequence. With one exception
+ * (see below), that character won't be returned.
+ */
+
+ gly = ESCAPE_ERROR;
+ *start = ++*end;
+ *sz = 0;
+ term = '\0';
+
+ switch ((*start)[-1]) {
+ /*
+ * First the glyphs. There are several different forms of
+ * these, but each eventually returns a substring of the glyph
+ * name.
+ */
+ case '(':
+ gly = ESCAPE_SPECIAL;
+ *sz = 2;
+ break;
+ case '[':
+ gly = ESCAPE_SPECIAL;
+ term = ']';
+ break;
+ case 'C':
+ if ('\'' != **start)
+ return ESCAPE_ERROR;
+ *start = ++*end;
+ gly = ESCAPE_SPECIAL;
+ term = '\'';
+ break;
+
+ /*
+ * Escapes taking no arguments at all.
+ */
+ case 'd':
+ case 'u':
+ case ',':
+ case '/':
+ return ESCAPE_IGNORE;
+
+ /*
+ * The \z escape is supposed to output the following
+ * character without advancing the cursor position.
+ * Since we are mostly dealing with terminal mode,
+ * let us just skip the next character.
+ */
+ case 'z':
+ return ESCAPE_SKIPCHAR;
+
+ /*
+ * Handle all triggers matching \X(xy, \Xx, and \X[xxxx], where
+ * 'X' is the trigger. These have opaque sub-strings.
+ */
+ case 'F':
+ case 'g':
+ case 'k':
+ case 'M':
+ case 'm':
+ case 'n':
+ case 'V':
+ case 'Y':
+ gly = ESCAPE_IGNORE;
git.ckatri.com / mandoc.git / blobdiff