static inlines from dquote_static.c -> new dquote_inline.h

1 files changed, 160 insertions, 0 deletions

diff --git a/dquote_inline.h b/dquote_inline.h
new file mode 100644
index 0000000000..d8548bf890
--- /dev/null
+++ b/dquote_inline.h
@@ -0,0 +1,160 @@
+/*    dquote_inline.h
+ *
+ *    Copyright (C) 2015 by Larry Wall and others
+ *
+ *    You may distribute under the terms of either the GNU General Public
+ *    License or the Artistic License, as specified in the README file.
+ */
+
+#ifndef DQUOTE_INLINE_H /* Guard against nested #inclusion */
+#define DQUOTE_INLINE_H
+
+/*
+ - regcurly - a little FSA that accepts {\d+,?\d*}
+    Pulled from reg.c.
+ */
+PERL_STATIC_INLINE I32
+S_regcurly(const char *s)
+{
+    PERL_ARGS_ASSERT_REGCURLY;
+
+    if (*s++ != '{')
+	return FALSE;
+    if (!isDIGIT(*s))
+	return FALSE;
+    while (isDIGIT(*s))
+	s++;
+    if (*s == ',') {
+	s++;
+	while (isDIGIT(*s))
+	    s++;
+    }
+
+    return *s == '}';
+}
+
+PERL_STATIC_INLINE bool
+S_grok_bslash_x(pTHX_ char **s, UV *uv, const char** error_msg,
+                      const bool output_warning, const bool strict,
+                      const bool silence_non_portable,
+                      const bool UTF)
+{
+
+/*  Documentation to be supplied when interface nailed down finally
+ *  This returns FALSE if there is an error which the caller need not recover
+ *  from; otherwise TRUE.
+ *  It guarantees that the returned codepoint, *uv, when expressed as
+ *  utf8 bytes, would fit within the skipped "\x{...}" bytes.
+ *
+ *  On input:
+ *	s   is the address of a pointer to a NULL terminated string that begins
+ *	    with 'x', and the previous character was a backslash.  At exit, *s
+ *	    will be advanced to the byte just after those absorbed by this
+ *	    function.  Hence the caller can continue parsing from there.  In
+ *	    the case of an error, this routine has generally positioned *s to
+ *	    point just to the right of the first bad spot, so that a message
+ *	    that has a "<--" to mark the spot will be correctly positioned.
+ *	uv  points to a UV that will hold the output value, valid only if the
+ *	    return from the function is TRUE
+ *      error_msg is a pointer that will be set to an internal buffer giving an
+ *	    error message upon failure (the return is FALSE).  Untouched if
+ *	    function succeeds
+ *	output_warning says whether to output any warning messages, or suppress
+ *	    them
+ *	strict is true if anything out of the ordinary should cause this to
+ *	    fail instead of warn or be silent.  For example, it requires
+ *	    exactly 2 digits following the \x (when there are no braces).
+ *	    3 digits could be a mistake, so is forbidden in this mode.
+ *      silence_non_portable is true if to suppress warnings about the code
+ *          point returned being too large to fit on all platforms.
+ *	UTF is true iff the string *s is encoded in UTF-8.
+ */
+    char* e;
+    STRLEN numbers_len;
+    I32 flags = PERL_SCAN_DISALLOW_PREFIX;
+#ifdef DEBUGGING
+    char *start = *s - 1;
+    assert(*start == '\\');
+#endif
+
+    PERL_ARGS_ASSERT_GROK_BSLASH_X;
+
+    assert(**s == 'x');
+    (*s)++;
+
+    if (strict || ! output_warning) {
+        flags |= PERL_SCAN_SILENT_ILLDIGIT;
+    }
+
+    if (**s != '{') {
+        STRLEN len = (strict) ? 3 : 2;
+
+	*uv = grok_hex(*s, &len, &flags, NULL);
+	*s += len;
+        if (strict && len != 2) {
+            if (len < 2) {
+                *s += (UTF) ? UTF8SKIP(*s) : 1;
+                *error_msg = "Non-hex character";
+            }
+            else {
+                *error_msg = "Use \\x{...} for more than two hex characters";
+            }
+            return FALSE;
+        }
+	goto ok;
+    }
+
+    e = strchr(*s, '}');
+    if (!e) {
+        (*s)++;  /* Move past the '{' */
+        while (isXDIGIT(**s)) { /* Position beyond the legal digits */
+            (*s)++;
+        }
+        /* XXX The corresponding message above for \o is just '\\o{'; other
+         * messages for other constructs include the '}', so are inconsistent.
+         */
+	*error_msg = "Missing right brace on \\x{}";
+	return FALSE;
+    }
+
+    (*s)++;    /* Point to expected first digit (could be first byte of utf8
+                  sequence if not a digit) */
+    numbers_len = e - *s;
+    if (numbers_len == 0) {
+        if (strict) {
+            (*s)++;    /* Move past the } */
+            *error_msg = "Number with no digits";
+            return FALSE;
+        }
+        *s = e + 1;
+        *uv = 0;
+        goto ok;
+    }
+
+    flags |= PERL_SCAN_ALLOW_UNDERSCORES;
+    if (silence_non_portable) {
+        flags |= PERL_SCAN_SILENT_NON_PORTABLE;
+    }
+
+    *uv = grok_hex(*s, &numbers_len, &flags, NULL);
+    /* Note that if has non-hex, will ignore everything starting with that up
+     * to the '}' */
+
+    if (strict && numbers_len != (STRLEN) (e - *s)) {
+        *s += numbers_len;
+        *s += (UTF) ? UTF8SKIP(*s) : 1;
+        *error_msg = "Non-hex character";
+        return FALSE;
+    }
+
+    /* Return past the '}' */
+    *s = e + 1;
+
+  ok:
+    /* guarantee replacing "\x{...}" with utf8 bytes fits within
+     * existing space */
+    assert(OFFUNISKIP(*uv) < *s - start);
+    return TRUE;
+}
+
+#endif  /* DQUOTE_INLINE_H */