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/*
* Copyright (C) Axel Duch
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
#include <nxt_regex.h>
#define PCRE2_CODE_UNIT_WIDTH 8
#include <pcre2.h>
static void *nxt_pcre2_malloc(PCRE2_SIZE size, void *memory_data);
static void nxt_pcre2_free(void *p, void *memory_data);
struct nxt_regex_s {
pcre2_code *code;
nxt_str_t pattern;
};
nxt_regex_t *
nxt_regex_compile(nxt_mp_t *mp, nxt_str_t *source, nxt_regex_err_t *err)
{
int errcode;
nxt_int_t ret;
PCRE2_SIZE erroffset;
nxt_regex_t *re;
pcre2_general_context *general_ctx;
pcre2_compile_context *compile_ctx;
static const u_char alloc_error[] = "memory allocation failed";
general_ctx = pcre2_general_context_create(nxt_pcre2_malloc,
nxt_pcre2_free, mp);
if (nxt_slow_path(general_ctx == NULL)) {
goto alloc_fail;
}
compile_ctx = pcre2_compile_context_create(general_ctx);
if (nxt_slow_path(compile_ctx == NULL)) {
goto alloc_fail;
}
re = nxt_mp_get(mp, sizeof(nxt_regex_t));
if (nxt_slow_path(re == NULL)) {
goto alloc_fail;
}
if (nxt_slow_path(nxt_str_dup(mp, &re->pattern, source) == NULL)) {
goto alloc_fail;
}
re->code = pcre2_compile((PCRE2_SPTR) source->start, source->length, 0,
&errcode, &erroffset, compile_ctx);
if (nxt_slow_path(re->code == NULL)) {
err->offset = erroffset;
ret = pcre2_get_error_message(errcode, (PCRE2_UCHAR *) err->msg,
ERR_BUF_SIZE);
if (ret < 0) {
(void) nxt_sprintf(err->msg, err->msg + ERR_BUF_SIZE,
"compilation failed with unknown "
"error code: %d%Z", errcode);
}
return NULL;
}
#if 0
errcode = pcre2_jit_compile(re, PCRE2_JIT_COMPLETE);
if (nxt_slow_path(errcode != 0 && errcode != PCRE2_ERROR_JIT_BADOPTION)) {
ret = pcre2_get_error_message(errcode, (PCRE2_UCHAR *) err->msg,
ERR_BUF_SIZE);
if (ret < 0) {
(void) nxt_sprintf(err->msg, err->msg + ERR_BUF_SIZE,
"JIT compilation failed with unknown "
"error code: %d%Z", errcode);
}
return NULL;
}
#endif
return re;
alloc_fail:
err->offset = source->length;
nxt_memcpy(err->msg, alloc_error, sizeof(alloc_error));
return NULL;
}
static void *
nxt_pcre2_malloc(PCRE2_SIZE size, void *mp)
{
return nxt_mp_get(mp, size);
}
static void
nxt_pcre2_free(void *p, void *mp)
{
}
nxt_regex_match_t *
nxt_regex_match_create(nxt_mp_t *mp, size_t size)
{
nxt_regex_match_t *match;
pcre2_general_context *ctx;
ctx = pcre2_general_context_create(nxt_pcre2_malloc, nxt_pcre2_free, mp);
if (nxt_slow_path(ctx == NULL)) {
nxt_thread_log_alert("pcre2_general_context_create() failed");
return NULL;
}
match = pcre2_match_data_create(size, ctx);
if (nxt_slow_path(match == NULL)) {
nxt_thread_log_alert("pcre2_match_data_create(%uz) failed", size);
return NULL;
}
return match;
}
nxt_int_t
nxt_regex_match(nxt_regex_t *re, u_char *subject, size_t length,
nxt_regex_match_t *match)
{
nxt_int_t ret;
PCRE2_UCHAR errptr[ERR_BUF_SIZE];
ret = pcre2_match(re->code, (PCRE2_SPTR) subject, length, 0, 0, match,
NULL);
if (nxt_slow_path(ret < PCRE2_ERROR_NOMATCH)) {
if (pcre2_get_error_message(ret, errptr, ERR_BUF_SIZE) < 0) {
nxt_thread_log_error(NXT_LOG_ERR,
"pcre2_match() failed: %d on \"%*s\" "
"using \"%V\"", ret, subject, length, subject,
&re->pattern);
} else {
nxt_thread_log_error(NXT_LOG_ERR,
"pcre2_match() failed: %s (%d) on \"%*s\" "
"using \"%V\"", errptr, ret, length, subject,
&re->pattern);
}
return NXT_ERROR;
}
return (ret != PCRE2_ERROR_NOMATCH);
}
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