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freeswitch/libs/pcre/pcrecpp.cc
Michael Jerris f7efdaa901 update to pcre 7.9 
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13706 d0543943-73ff-0310-b7d9-9358b9ac24b2
2009-06-08 23:51:30 +00:00

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// Copyright (c) 2005, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Author: Sanjay Ghemawat
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <limits.h> /* for SHRT_MIN, USHRT_MAX, etc */
#include <assert.h>
#include <errno.h>
#include <string>
#include <algorithm>
#include "pcrecpp_internal.h"
#include "pcre.h"
#include "pcrecpp.h"
#include "pcre_stringpiece.h"
namespace pcrecpp {
// Maximum number of args we can set
static const int kMaxArgs = 16;
static const int kVecSize = (1 + kMaxArgs) * 3; // results + PCRE workspace
// Special object that stands-in for no argument
Arg RE::no_arg((void*)NULL);
// This is for ABI compatibility with old versions of pcre (pre-7.6),
// which defined a global no_arg variable instead of putting it in the
// RE class. This works on GCC >= 3, at least. It definitely works
// for ELF, but may not for other object formats (Mach-O, for
// instance, does not support aliases.) We could probably have a more
// inclusive test if we ever needed it. (Note that not only the
// __attribute__ syntax, but also __USER_LABEL_PREFIX__, are
// gnu-specific.)
#if defined(__GNUC__) && __GNUC__ >= 3 && defined(__ELF__)
# define ULP_AS_STRING(x) ULP_AS_STRING_INTERNAL(x)
# define ULP_AS_STRING_INTERNAL(x) #x
# define USER_LABEL_PREFIX_STR ULP_AS_STRING(__USER_LABEL_PREFIX__)
extern Arg no_arg
__attribute__((alias(USER_LABEL_PREFIX_STR "_ZN7pcrecpp2RE6no_argE")));
#endif
// If a regular expression has no error, its error_ field points here
static const string empty_string;
// If the user doesn't ask for any options, we just use this one
static RE_Options default_options;
void RE::Init(const string& pat, const RE_Options* options) {
pattern_ = pat;
if (options == NULL) {
options_ = default_options;
} else {
options_ = *options;
}
error_ = &empty_string;
re_full_ = NULL;
re_partial_ = NULL;
re_partial_ = Compile(UNANCHORED);
if (re_partial_ != NULL) {
re_full_ = Compile(ANCHOR_BOTH);
}
}
void RE::Cleanup() {
if (re_full_ != NULL) (*pcre_free)(re_full_);
if (re_partial_ != NULL) (*pcre_free)(re_partial_);
if (error_ != &empty_string) delete error_;
}
RE::~RE() {
Cleanup();
}
pcre* RE::Compile(Anchor anchor) {
// First, convert RE_Options into pcre options
int pcre_options = 0;
pcre_options = options_.all_options();
// Special treatment for anchoring. This is needed because at
// runtime pcre only provides an option for anchoring at the
// beginning of a string (unless you use offset).
//
// There are three types of anchoring we want:
// UNANCHORED Compile the original pattern, and use
// a pcre unanchored match.
// ANCHOR_START Compile the original pattern, and use
// a pcre anchored match.
// ANCHOR_BOTH Tack a "\z" to the end of the original pattern
// and use a pcre anchored match.
const char* compile_error;
int eoffset;
pcre* re;
if (anchor != ANCHOR_BOTH) {
re = pcre_compile(pattern_.c_str(), pcre_options,
&compile_error, &eoffset, NULL);
} else {
// Tack a '\z' at the end of RE. Parenthesize it first so that
// the '\z' applies to all top-level alternatives in the regexp.
string wrapped = "(?:"; // A non-counting grouping operator
wrapped += pattern_;
wrapped += ")\\z";
re = pcre_compile(wrapped.c_str(), pcre_options,
&compile_error, &eoffset, NULL);
}
if (re == NULL) {
if (error_ == &empty_string) error_ = new string(compile_error);
}
return re;
}
/***** Matching interfaces *****/
bool RE::FullMatch(const StringPiece& text,
const Arg& ptr1,
const Arg& ptr2,
const Arg& ptr3,
const Arg& ptr4,
const Arg& ptr5,
const Arg& ptr6,
const Arg& ptr7,
const Arg& ptr8,
const Arg& ptr9,
const Arg& ptr10,
const Arg& ptr11,
const Arg& ptr12,
const Arg& ptr13,
const Arg& ptr14,
const Arg& ptr15,
const Arg& ptr16) const {
const Arg* args[kMaxArgs];
int n = 0;
if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
done:
int consumed;
int vec[kVecSize];
return DoMatchImpl(text, ANCHOR_BOTH, &consumed, args, n, vec, kVecSize);
}
bool RE::PartialMatch(const StringPiece& text,
const Arg& ptr1,
const Arg& ptr2,
const Arg& ptr3,
const Arg& ptr4,
const Arg& ptr5,
const Arg& ptr6,
const Arg& ptr7,
const Arg& ptr8,
const Arg& ptr9,
const Arg& ptr10,
const Arg& ptr11,
const Arg& ptr12,
const Arg& ptr13,
const Arg& ptr14,
const Arg& ptr15,
const Arg& ptr16) const {
const Arg* args[kMaxArgs];
int n = 0;
if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
done:
int consumed;
int vec[kVecSize];
return DoMatchImpl(text, UNANCHORED, &consumed, args, n, vec, kVecSize);
}
bool RE::Consume(StringPiece* input,
const Arg& ptr1,
const Arg& ptr2,
const Arg& ptr3,
const Arg& ptr4,
const Arg& ptr5,
const Arg& ptr6,
const Arg& ptr7,
const Arg& ptr8,
const Arg& ptr9,
const Arg& ptr10,
const Arg& ptr11,
const Arg& ptr12,
const Arg& ptr13,
const Arg& ptr14,
const Arg& ptr15,
const Arg& ptr16) const {
const Arg* args[kMaxArgs];
int n = 0;
if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
done:
int consumed;
int vec[kVecSize];
if (DoMatchImpl(*input, ANCHOR_START, &consumed,
args, n, vec, kVecSize)) {
input->remove_prefix(consumed);
return true;
} else {
return false;
}
}
bool RE::FindAndConsume(StringPiece* input,
const Arg& ptr1,
const Arg& ptr2,
const Arg& ptr3,
const Arg& ptr4,
const Arg& ptr5,
const Arg& ptr6,
const Arg& ptr7,
const Arg& ptr8,
const Arg& ptr9,
const Arg& ptr10,
const Arg& ptr11,
const Arg& ptr12,
const Arg& ptr13,
const Arg& ptr14,
const Arg& ptr15,
const Arg& ptr16) const {
const Arg* args[kMaxArgs];
int n = 0;
if (&ptr1 == &no_arg) goto done; args[n++] = &ptr1;
if (&ptr2 == &no_arg) goto done; args[n++] = &ptr2;
if (&ptr3 == &no_arg) goto done; args[n++] = &ptr3;
if (&ptr4 == &no_arg) goto done; args[n++] = &ptr4;
if (&ptr5 == &no_arg) goto done; args[n++] = &ptr5;
if (&ptr6 == &no_arg) goto done; args[n++] = &ptr6;
if (&ptr7 == &no_arg) goto done; args[n++] = &ptr7;
if (&ptr8 == &no_arg) goto done; args[n++] = &ptr8;
if (&ptr9 == &no_arg) goto done; args[n++] = &ptr9;
if (&ptr10 == &no_arg) goto done; args[n++] = &ptr10;
if (&ptr11 == &no_arg) goto done; args[n++] = &ptr11;
if (&ptr12 == &no_arg) goto done; args[n++] = &ptr12;
if (&ptr13 == &no_arg) goto done; args[n++] = &ptr13;
if (&ptr14 == &no_arg) goto done; args[n++] = &ptr14;
if (&ptr15 == &no_arg) goto done; args[n++] = &ptr15;
if (&ptr16 == &no_arg) goto done; args[n++] = &ptr16;
done:
int consumed;
int vec[kVecSize];
if (DoMatchImpl(*input, UNANCHORED, &consumed,
args, n, vec, kVecSize)) {
input->remove_prefix(consumed);
return true;
} else {
return false;
}
}
bool RE::Replace(const StringPiece& rewrite,
string *str) const {
int vec[kVecSize];
int matches = TryMatch(*str, 0, UNANCHORED, vec, kVecSize);
if (matches == 0)
return false;
string s;
if (!Rewrite(&s, rewrite, *str, vec, matches))
return false;
assert(vec[0] >= 0);
assert(vec[1] >= 0);
str->replace(vec[0], vec[1] - vec[0], s);
return true;
}
// Returns PCRE_NEWLINE_CRLF, PCRE_NEWLINE_CR, or PCRE_NEWLINE_LF.
// Note that PCRE_NEWLINE_CRLF is defined to be P_N_CR | P_N_LF.
// Modified by PH to add PCRE_NEWLINE_ANY and PCRE_NEWLINE_ANYCRLF.
static int NewlineMode(int pcre_options) {
// TODO: if we can make it threadsafe, cache this var
int newline_mode = 0;
/* if (newline_mode) return newline_mode; */ // do this once it's cached
if (pcre_options & (PCRE_NEWLINE_CRLF|PCRE_NEWLINE_CR|PCRE_NEWLINE_LF|
PCRE_NEWLINE_ANY|PCRE_NEWLINE_ANYCRLF)) {
newline_mode = (pcre_options &
(PCRE_NEWLINE_CRLF|PCRE_NEWLINE_CR|PCRE_NEWLINE_LF|
PCRE_NEWLINE_ANY|PCRE_NEWLINE_ANYCRLF));
} else {
int newline;
pcre_config(PCRE_CONFIG_NEWLINE, &newline);
if (newline == 10)
newline_mode = PCRE_NEWLINE_LF;
else if (newline == 13)
newline_mode = PCRE_NEWLINE_CR;
else if (newline == 3338)
newline_mode = PCRE_NEWLINE_CRLF;
else if (newline == -1)
newline_mode = PCRE_NEWLINE_ANY;
else if (newline == -2)
newline_mode = PCRE_NEWLINE_ANYCRLF;
else
assert(NULL == "Unexpected return value from pcre_config(NEWLINE)");
}
return newline_mode;
}
int RE::GlobalReplace(const StringPiece& rewrite,
string *str) const {
int count = 0;
int vec[kVecSize];
string out;
int start = 0;
int lastend = -1;
while (start <= static_cast<int>(str->length())) {
int matches = TryMatch(*str, start, UNANCHORED, vec, kVecSize);
if (matches <= 0)
break;
int matchstart = vec[0], matchend = vec[1];
assert(matchstart >= start);
assert(matchend >= matchstart);
if (matchstart == matchend && matchstart == lastend) {
// advance one character if we matched an empty string at the same
// place as the last match occurred
matchend = start + 1;
// If the current char is CR and we're in CRLF mode, skip LF too.
// Note it's better to call pcre_fullinfo() than to examine
// all_options(), since options_ could have changed bewteen
// compile-time and now, but this is simpler and safe enough.
// Modified by PH to add ANY and ANYCRLF.
if (start+1 < static_cast<int>(str->length()) &&
(*str)[start] == '\r' && (*str)[start+1] == '\n' &&
(NewlineMode(options_.all_options()) == PCRE_NEWLINE_CRLF ||
NewlineMode(options_.all_options()) == PCRE_NEWLINE_ANY ||
NewlineMode(options_.all_options()) == PCRE_NEWLINE_ANYCRLF)
) {
matchend++;
}
// We also need to advance more than one char if we're in utf8 mode.
#ifdef SUPPORT_UTF8
if (options_.utf8()) {
while (matchend < static_cast<int>(str->length()) &&
((*str)[matchend] & 0xc0) == 0x80)
matchend++;
}
#endif
if (matchend <= static_cast<int>(str->length()))
out.append(*str, start, matchend - start);
start = matchend;
} else {
out.append(*str, start, matchstart - start);
Rewrite(&out, rewrite, *str, vec, matches);
start = matchend;
lastend = matchend;
count++;
}
}
if (count == 0)
return 0;
if (start < static_cast<int>(str->length()))
out.append(*str, start, str->length() - start);
swap(out, *str);
return count;
}
bool RE::Extract(const StringPiece& rewrite,
const StringPiece& text,
string *out) const {
int vec[kVecSize];
int matches = TryMatch(text, 0, UNANCHORED, vec, kVecSize);
if (matches == 0)
return false;
out->erase();
return Rewrite(out, rewrite, text, vec, matches);
}
/*static*/ string RE::QuoteMeta(const StringPiece& unquoted) {
string result;
// Escape any ascii character not in [A-Za-z_0-9].
//
// Note that it's legal to escape a character even if it has no
// special meaning in a regular expression -- so this function does
// that. (This also makes it identical to the perl function of the
// same name; see `perldoc -f quotemeta`.) The one exception is
// escaping NUL: rather than doing backslash + NUL, like perl does,
// we do '\0', because pcre itself doesn't take embedded NUL chars.
for (int ii = 0; ii < unquoted.size(); ++ii) {
// Note that using 'isalnum' here raises the benchmark time from
// 32ns to 58ns:
if (unquoted[ii] == '\0') {
result += "\\0";
} else if ((unquoted[ii] < 'a' || unquoted[ii] > 'z') &&
(unquoted[ii] < 'A' || unquoted[ii] > 'Z') &&
(unquoted[ii] < '0' || unquoted[ii] > '9') &&
unquoted[ii] != '_' &&
// If this is the part of a UTF8 or Latin1 character, we need
// to copy this byte without escaping. Experimentally this is
// what works correctly with the regexp library.
!(unquoted[ii] & 128)) {
result += '\\';
result += unquoted[ii];
} else {
result += unquoted[ii];
}
}
return result;
}
/***** Actual matching and rewriting code *****/
int RE::TryMatch(const StringPiece& text,
int startpos,
Anchor anchor,
int *vec,
int vecsize) const {
pcre* re = (anchor == ANCHOR_BOTH) ? re_full_ : re_partial_;
if (re == NULL) {
//fprintf(stderr, "Matching against invalid re: %s\n", error_->c_str());
return 0;
}
pcre_extra extra = { 0, 0, 0, 0, 0, 0 };
if (options_.match_limit() > 0) {
extra.flags |= PCRE_EXTRA_MATCH_LIMIT;
extra.match_limit = options_.match_limit();
}
if (options_.match_limit_recursion() > 0) {
extra.flags |= PCRE_EXTRA_MATCH_LIMIT_RECURSION;
extra.match_limit_recursion = options_.match_limit_recursion();
}
int rc = pcre_exec(re, // The regular expression object
&extra,
(text.data() == NULL) ? "" : text.data(),
text.size(),
startpos,
(anchor == UNANCHORED) ? 0 : PCRE_ANCHORED,
vec,
vecsize);
// Handle errors
if (rc == PCRE_ERROR_NOMATCH) {
return 0;
} else if (rc < 0) {
//fprintf(stderr, "Unexpected return code: %d when matching '%s'\n",
// re, pattern_.c_str());
return 0;
} else if (rc == 0) {
// pcre_exec() returns 0 as a special case when the number of
// capturing subpatterns exceeds the size of the vector.
// When this happens, there is a match and the output vector
// is filled, but we miss out on the positions of the extra subpatterns.
rc = vecsize / 2;
}
return rc;
}
bool RE::DoMatchImpl(const StringPiece& text,
Anchor anchor,
int* consumed,
const Arg* const* args,
int n,
int* vec,
int vecsize) const {
assert((1 + n) * 3 <= vecsize); // results + PCRE workspace
int matches = TryMatch(text, 0, anchor, vec, vecsize);
assert(matches >= 0); // TryMatch never returns negatives
if (matches == 0)
return false;
*consumed = vec[1];
if (n == 0 || args == NULL) {
// We are not interested in results
return true;
}
if (NumberOfCapturingGroups() < n) {
// RE has fewer capturing groups than number of arg pointers passed in
return false;
}
// If we got here, we must have matched the whole pattern.
// We do not need (can not do) any more checks on the value of 'matches' here
// -- see the comment for TryMatch.
for (int i = 0; i < n; i++) {
const int start = vec[2*(i+1)];
const int limit = vec[2*(i+1)+1];
if (!args[i]->Parse(text.data() + start, limit-start)) {
// TODO: Should we indicate what the error was?
return false;
}
}
return true;
}
bool RE::DoMatch(const StringPiece& text,
Anchor anchor,
int* consumed,
const Arg* const args[],
int n) const {
assert(n >= 0);
size_t const vecsize = (1 + n) * 3; // results + PCRE workspace
// (as for kVecSize)
int space[21]; // use stack allocation for small vecsize (common case)
int* vec = vecsize <= 21 ? space : new int[vecsize];
bool retval = DoMatchImpl(text, anchor, consumed, args, n, vec, vecsize);
if (vec != space) delete [] vec;
return retval;
}
bool RE::Rewrite(string *out, const StringPiece &rewrite,
const StringPiece &text, int *vec, int veclen) const {
for (const char *s = rewrite.data(), *end = s + rewrite.size();
s < end; s++) {
int c = *s;
if (c == '\\') {
c = *++s;
if (isdigit(c)) {
int n = (c - '0');
if (n >= veclen) {
//fprintf(stderr, requested group %d in regexp %.*s\n",
// n, rewrite.size(), rewrite.data());
return false;
}
int start = vec[2 * n];
if (start >= 0)
out->append(text.data() + start, vec[2 * n + 1] - start);
} else if (c == '\\') {
*out += '\\';
} else {
//fprintf(stderr, "invalid rewrite pattern: %.*s\n",
// rewrite.size(), rewrite.data());
return false;
}
} else {
*out += c;
}
}
return true;
}
// Return the number of capturing subpatterns, or -1 if the
// regexp wasn't valid on construction.
int RE::NumberOfCapturingGroups() const {
if (re_partial_ == NULL) return -1;
int result;
int pcre_retval = pcre_fullinfo(re_partial_, // The regular expression object
NULL, // We did not study the pattern
PCRE_INFO_CAPTURECOUNT,
&result);
assert(pcre_retval == 0);
return result;
}
/***** Parsers for various types *****/
bool Arg::parse_null(const char* str, int n, void* dest) {
// We fail if somebody asked us to store into a non-NULL void* pointer
return (dest == NULL);
}
bool Arg::parse_string(const char* str, int n, void* dest) {
if (dest == NULL) return true;
reinterpret_cast<string*>(dest)->assign(str, n);
return true;
}
bool Arg::parse_stringpiece(const char* str, int n, void* dest) {
if (dest == NULL) return true;
reinterpret_cast<StringPiece*>(dest)->set(str, n);
return true;
}
bool Arg::parse_char(const char* str, int n, void* dest) {
if (n != 1) return false;
if (dest == NULL) return true;
*(reinterpret_cast<char*>(dest)) = str[0];
return true;
}
bool Arg::parse_uchar(const char* str, int n, void* dest) {
if (n != 1) return false;
if (dest == NULL) return true;
*(reinterpret_cast<unsigned char*>(dest)) = str[0];
return true;
}
// Largest number spec that we are willing to parse
static const int kMaxNumberLength = 32;
// REQUIRES "buf" must have length at least kMaxNumberLength+1
// REQUIRES "n > 0"
// Copies "str" into "buf" and null-terminates if necessary.
// Returns one of:
// a. "str" if no termination is needed
// b. "buf" if the string was copied and null-terminated
// c. "" if the input was invalid and has no hope of being parsed
static const char* TerminateNumber(char* buf, const char* str, int n) {
if ((n > 0) && isspace(*str)) {
// We are less forgiving than the strtoxxx() routines and do not
// allow leading spaces.
return "";
}
// See if the character right after the input text may potentially
// look like a digit.
if (isdigit(str[n]) ||
((str[n] >= 'a') && (str[n] <= 'f')) ||
((str[n] >= 'A') && (str[n] <= 'F'))) {
if (n > kMaxNumberLength) return ""; // Input too big to be a valid number
memcpy(buf, str, n);
buf[n] = '\0';
return buf;
} else {
// We can parse right out of the supplied string, so return it.
return str;
}
}
bool Arg::parse_long_radix(const char* str,
int n,
void* dest,
int radix) {
if (n == 0) return false;
char buf[kMaxNumberLength+1];
str = TerminateNumber(buf, str, n);
char* end;
errno = 0;
long r = strtol(str, &end, radix);
if (end != str + n) return false; // Leftover junk
if (errno) return false;
if (dest == NULL) return true;
*(reinterpret_cast<long*>(dest)) = r;
return true;
}
bool Arg::parse_ulong_radix(const char* str,
int n,
void* dest,
int radix) {
if (n == 0) return false;
char buf[kMaxNumberLength+1];
str = TerminateNumber(buf, str, n);
if (str[0] == '-') return false; // strtoul() on a negative number?!
char* end;
errno = 0;
unsigned long r = strtoul(str, &end, radix);
if (end != str + n) return false; // Leftover junk
if (errno) return false;
if (dest == NULL) return true;
*(reinterpret_cast<unsigned long*>(dest)) = r;
return true;
}
bool Arg::parse_short_radix(const char* str,
int n,
void* dest,
int radix) {
long r;
if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
if (r < SHRT_MIN || r > SHRT_MAX) return false; // Out of range
if (dest == NULL) return true;
*(reinterpret_cast<short*>(dest)) = static_cast<short>(r);
return true;
}
bool Arg::parse_ushort_radix(const char* str,
int n,
void* dest,
int radix) {
unsigned long r;
if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
if (r > USHRT_MAX) return false; // Out of range
if (dest == NULL) return true;
*(reinterpret_cast<unsigned short*>(dest)) = static_cast<unsigned short>(r);
return true;
}
bool Arg::parse_int_radix(const char* str,
int n,
void* dest,
int radix) {
long r;
if (!parse_long_radix(str, n, &r, radix)) return false; // Could not parse
if (r < INT_MIN || r > INT_MAX) return false; // Out of range
if (dest == NULL) return true;
*(reinterpret_cast<int*>(dest)) = r;
return true;
}
bool Arg::parse_uint_radix(const char* str,
int n,
void* dest,
int radix) {
unsigned long r;
if (!parse_ulong_radix(str, n, &r, radix)) return false; // Could not parse
if (r > UINT_MAX) return false; // Out of range
if (dest == NULL) return true;
*(reinterpret_cast<unsigned int*>(dest)) = r;
return true;
}
bool Arg::parse_longlong_radix(const char* str,
int n,
void* dest,
int radix) {
#ifndef HAVE_LONG_LONG
return false;
#else
if (n == 0) return false;
char buf[kMaxNumberLength+1];
str = TerminateNumber(buf, str, n);
char* end;
errno = 0;
#if defined HAVE_STRTOQ
long long r = strtoq(str, &end, radix);
#elif defined HAVE_STRTOLL
long long r = strtoll(str, &end, radix);
#elif defined HAVE__STRTOI64
long long r = _strtoi64(str, &end, radix);
#else
#error parse_longlong_radix: cannot convert input to a long-long
#endif
if (end != str + n) return false; // Leftover junk
if (errno) return false;
if (dest == NULL) return true;
*(reinterpret_cast<long long*>(dest)) = r;
return true;
#endif /* HAVE_LONG_LONG */
}
bool Arg::parse_ulonglong_radix(const char* str,
int n,
void* dest,
int radix) {
#ifndef HAVE_UNSIGNED_LONG_LONG
return false;
#else
if (n == 0) return false;
char buf[kMaxNumberLength+1];
str = TerminateNumber(buf, str, n);
if (str[0] == '-') return false; // strtoull() on a negative number?!
char* end;
errno = 0;
#if defined HAVE_STRTOQ
unsigned long long r = strtouq(str, &end, radix);
#elif defined HAVE_STRTOLL
unsigned long long r = strtoull(str, &end, radix);
#elif defined HAVE__STRTOI64
unsigned long long r = _strtoui64(str, &end, radix);
#else
#error parse_ulonglong_radix: cannot convert input to a long-long
#endif
if (end != str + n) return false; // Leftover junk
if (errno) return false;
if (dest == NULL) return true;
*(reinterpret_cast<unsigned long long*>(dest)) = r;
return true;
#endif /* HAVE_UNSIGNED_LONG_LONG */
}
bool Arg::parse_double(const char* str, int n, void* dest) {
if (n == 0) return false;
static const int kMaxLength = 200;
char buf[kMaxLength];
if (n >= kMaxLength) return false;
memcpy(buf, str, n);
buf[n] = '\0';
errno = 0;
char* end;
double r = strtod(buf, &end);
if (end != buf + n) return false; // Leftover junk
if (errno) return false;
if (dest == NULL) return true;
*(reinterpret_cast<double*>(dest)) = r;
return true;
}
bool Arg::parse_float(const char* str, int n, void* dest) {
double r;
if (!parse_double(str, n, &r)) return false;
if (dest == NULL) return true;
*(reinterpret_cast<float*>(dest)) = static_cast<float>(r);
return true;
}
#define DEFINE_INTEGER_PARSERS(name) \
bool Arg::parse_##name(const char* str, int n, void* dest) { \
return parse_##name##_radix(str, n, dest, 10); \
} \
bool Arg::parse_##name##_hex(const char* str, int n, void* dest) { \
return parse_##name##_radix(str, n, dest, 16); \
} \
bool Arg::parse_##name##_octal(const char* str, int n, void* dest) { \
return parse_##name##_radix(str, n, dest, 8); \
} \
bool Arg::parse_##name##_cradix(const char* str, int n, void* dest) { \
return parse_##name##_radix(str, n, dest, 0); \
}
DEFINE_INTEGER_PARSERS(short) /* */
DEFINE_INTEGER_PARSERS(ushort) /* */
DEFINE_INTEGER_PARSERS(int) /* Don't use semicolons after these */
DEFINE_INTEGER_PARSERS(uint) /* statements because they can cause */
DEFINE_INTEGER_PARSERS(long) /* compiler warnings if the checking */
DEFINE_INTEGER_PARSERS(ulong) /* level is turned up high enough. */
DEFINE_INTEGER_PARSERS(longlong) /* */
DEFINE_INTEGER_PARSERS(ulonglong) /* */
#undef DEFINE_INTEGER_PARSERS
} // namespace pcrecpp
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