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default_scanner.c
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#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "./config.h"
#include "./default_scanner.h"
#include "./scanner.h"
#include "./util.h"
#define TRIM_SPACES(p, SET_MACRO, label, END_MACRO) \
switch ((p)->token) { \
case '\n': \
END_MACRO(p); \
return (p)->res; \
case '\t': \
case ' ': \
SKIP(p); \
break; \
default: \
SET_MACRO(p, (p)->chunk); \
(p)->state++; \
goto label; \
}
#define SCAN_END_MESSAGE(p) \
SET_KEY((p), KEY_MESSAGE); \
SET_VALUE(p, (p)->chunk); \
COMMIT(p); \
(p)->res.type = SCAN_COMPLETE;
#define SCAN_END(p) \
SET_VALUE(p, (p)->chunk); \
COMMIT(p); \
(p)->res.type = SCAN_COMPLETE;
#define SCANNER_END_ERROR_INCOMPLETE(p) \
SCANNER_SET_ERROR(p, "incomplete header", ERROR_PSTATE); \
SET_VALUE((p), ""); \
SCANNER_END_ERROR(p);
#define SCANNER_SCAN_NEXT_KEY(p) \
switch ((p)->token) { \
case '\n': \
SCAN_END_MESSAGE(p); \
return (p)->res; \
case ':': \
case '\x00': /* re-submitted partial data */ \
COMMIT(p); \
(p)->state = TRANSITIONVALUE_PSTATE; \
break; \
default: \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_NEXT_VALUE(p) \
switch ((p)->token) { \
case '\n': \
SCAN_END(p); \
return (p)->res; \
case ',': \
case '\x00': \
COMMIT(p); \
TRY_ADD_PROP(p, ERROR_PSTATE); \
(p)->state = TRANSITIONKEY_PSTATE; \
break; \
default: \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_NEXT_DATE(p, next_key) \
switch ((p)->token) { \
case '\n': \
SCANNER_END_ERROR_INCOMPLETE(p); \
return (p)->res; \
case '[': \
SKIP(p); \
SET_VALUE(p, (p)->chunk); \
break; \
case '0': \
case '1': \
case '2': \
case '3': \
case '4': \
case '5': \
case '6': \
case '7': \
case '8': \
case '9': \
case ':': \
case ',': \
case '.': \
case '-': \
case 'Z': \
case '+': \
(p)->blen++; \
break; \
case 'T': \
case ' ': \
case ']': \
case '\t': \
case '\x00': \
COMMIT(p); \
ADD_PROP(p); \
SET_KEY(p, next_key); \
SET_VALUE(p, (p)->chunk); \
(p)->state++; \
break; \
default: \
SCANNER_SET_ERROR( \
p, "invalid date or time in log header", ERROR_PSTATE); \
REMOVE_PROP(p); \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_NEXT_HEADER(p, next_key) \
switch ((p)->token) { \
case '\n': \
SCANNER_END_ERROR_INCOMPLETE(p); \
return (p)->res; \
case '[': \
SKIP(p); \
SET_VALUE(p, (p)->chunk); \
break; \
case '\t': \
case ' ': \
case ']': \
case '\x00': \
COMMIT(p); \
ADD_PROP(p); \
SET_KEY(p, next_key); \
(p)->state++; \
break; \
default: \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_NEXT_THREAD_BRACKET(p) \
switch ((p)->token) { \
case '\n': \
SCANNER_END_ERROR_INCOMPLETE(p); \
return (p)->res; \
case ']': \
case '\t': \
case '\x00': \
COMMIT(p); \
ADD_PROP(p); \
SET_KEY(p, KEY_CLASS); \
(p)->state = TRANSITIONCLASS_PSTATE; \
break; \
default: \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_NEXT_THREAD(p) \
switch ((p)->token) { \
case '\n': \
SCANNER_END_ERROR_INCOMPLETE(p); \
return (p)->res; \
case '[': \
(p)->state = THREADBRACKET_PSTATE; \
SKIP(p); \
SET_VALUE(p, (p)->chunk); \
break; \
default: \
(p)->state = THREADNOBRACKET_PSTATE; \
SCANNER_SCAN_NEXT_HEADER(p, KEY_CLASS); \
break; \
}
#define SCANNER_SCAN_NEXT_CALLTYPE(p) \
switch ((p)->token) { \
case '\n': \
SCAN_END_MESSAGE(p); \
return (p)->res; \
case ':': \
case '\x00': \
COMMIT(p); \
ADD_PROP(p); \
(p)->state++; \
break; \
default: \
(p)->blen++; \
break; \
}
#define SCANNER_SCAN_VERIFY_CALLTYPE(p) \
switch ((p)->token) { \
case '\n': \
SCAN_END_MESSAGE(p); \
return (p)->res; \
case ',': \
(p)->result.props->next->key = (p)->result.props->next->value; \
(p)->result.props->next->value = (p)->chunk; \
REMOVE_PROP(p); \
SCANNER_SCAN_NEXT_VALUE(p); \
break; \
default: \
SCANNER_SCAN_NEXT_KEY(p); \
break; \
}
void* scanner_create()
{
scanner_t* p = NULL;
prop_t* slab = NULL;
if ((p = calloc(1, sizeof(scanner_t))) == NULL ||
(slab = calloc(LOGD_SLAB_CAP, sizeof(prop_t))) == NULL) {
perror("calloc");
goto error;
}
scanner_init(p, slab);
return (void*)p;
error:
if (p)
free(p);
if (slab)
free(slab);
return NULL;
}
void scanner_reset(void* _p)
{
scanner_t* p = (scanner_t*)_p;
DEBUG_ASSERT(p != NULL);
p->state = INIT_PSTATE;
LOGD_SCANNER_RESET(p);
ADD_PROP(p);
SET_KEY(p, KEY_DATE);
}
void scanner_init(void* _p, prop_t* pslab)
{
scanner_t* p = (scanner_t*)_p;
DEBUG_ASSERT(p != NULL);
LOGD_SCANNER_INIT(p, pslab);
}
void scanner_free(void* _p)
{
scanner_t* p = (scanner_t*)_p;
if (p == NULL)
return;
free(p->pslab);
free(p);
}
scan_res_t scanner_scan(void* _p, char* chunk, size_t clen)
{
scanner_t* p = (scanner_t*)_p;
DEBUG_ASSERT(p != NULL);
DEBUG_ASSERT(chunk != NULL);
p->chunk = chunk;
p->blen = 0;
p->res.consumed = 0;
while (p->res.consumed < clen) {
p->token = chunk[p->res.consumed++];
switch (p->state) {
case INIT_PSTATE:
TRIM_SPACES(p, SET_VALUE, date, SCANNER_END_ERROR_INCOMPLETE);
break;
case DATE_PSTATE:
date:
SCANNER_SCAN_NEXT_DATE(p, KEY_TIME);
break;
case TIME_PSTATE:
SCANNER_SCAN_NEXT_DATE(p, KEY_LEVEL);
break;
case LEVEL_PSTATE:
level:
SCANNER_SCAN_NEXT_HEADER(p, KEY_THREAD);
break;
case THREAD_PSTATE:
thread:
SCANNER_SCAN_NEXT_THREAD(p);
break;
case THREADBRACKET_PSTATE:
SCANNER_SCAN_NEXT_THREAD_BRACKET(p);
break;
case THREADNOBRACKET_PSTATE:
SCANNER_SCAN_NEXT_HEADER(p, KEY_CLASS);
break;
case CLASS_PSTATE:
clazz:
SCANNER_SCAN_NEXT_HEADER(p, KEY_CALLTYPE);
break;
case CALLTYPE_PSTATE:
calltype:
SCANNER_SCAN_NEXT_CALLTYPE(p);
break;
case VERIFYCALLTYPE_PSTATE:
verifycalltype:
SCANNER_SCAN_VERIFY_CALLTYPE(p);
break;
case TRANSITIONVERIFYCALLTYPE_PSTATE:
TRIM_SPACES(p, SET_KEY, verifycalltype, SCAN_END_MESSAGE);
break;
case TRANSITIONKEY_PSTATE:
TRIM_SPACES(p, SET_KEY, key, SCAN_END_MESSAGE);
break;
key:
case KEY_PSTATE:
SCANNER_SCAN_NEXT_KEY(p);
break;
case VALUE_PSTATE:
value:
SCANNER_SCAN_NEXT_VALUE(p);
break;
case TRANSITIONLEVEL_PSTATE:
TRIM_SPACES(p, SET_VALUE, level, SCANNER_END_ERROR_INCOMPLETE);
break;
case TRANSITIONTHREAD_PSTATE:
TRIM_SPACES(p, SET_VALUE, thread, SCANNER_END_ERROR_INCOMPLETE);
break;
case TRANSITIONCALLTYPE_PSTATE:
TRIM_SPACES(p, SET_VALUE, calltype, SCAN_END_MESSAGE);
break;
case TRANSITIONCLASS_PSTATE:
TRIM_SPACES(p, SET_VALUE, clazz, SCANNER_END_ERROR_INCOMPLETE);
break;
case TRANSITIONVALUE_PSTATE:
TRIM_SPACES(p, SET_VALUE, value, SCAN_END);
break;
/* skip input until newline is found and state is reset */
case ERROR_PSTATE:
SCANNER_SCAN_ERROR(p);
break;
}
}
return p->res;
}