forked from osmocom/wireshark
483 lines
11 KiB
Plaintext
483 lines
11 KiB
Plaintext
%top {
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/* Include this before everything else, for various large-file definitions */
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#include "config.h"
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}
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/*
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* We want a reentrant scanner.
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*/
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%option reentrant
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/*
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* We don't use input, so don't generate code for it.
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*/
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%option noinput
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/*
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* We don't use unput, so don't generate code for it.
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*/
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%option nounput
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/*
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* We don't read interactively from the terminal.
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*/
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%option never-interactive
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/*
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* We want to stop processing when we get to the end of the input.
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*/
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%option noyywrap
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/*
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* The type for the state we keep for a scanner.
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*/
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%option extra-type="uat_load_scanner_state_t *"
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/*
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* We have to override the memory allocators so that we don't get
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* "unused argument" warnings from the yyscanner argument (which
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* we don't use, as we have a global memory allocator).
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*
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* We provide, as macros, our own versions of the routines generated by Flex,
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* which just call malloc()/realloc()/free() (as the Flex versions do),
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* discarding the extra argument.
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*/
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%option noyyalloc
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%option noyyrealloc
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%option noyyfree
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/*
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* Prefix scanner routines with "uat_load_" rather than "yy", so this scanner
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* can coexist with other scanners.
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*/
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%option prefix="uat_load_"
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%{
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/*
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* uat_load.l
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*
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* User Accessible Tables
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* Maintain an array of user accessible data strucures
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* One parser to fit them all
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*
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* (c) 2007, Luis E. Garcia Ontanon <luis@ontanon.org>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <glib.h>
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#include "uat-int.h"
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#include <wsutil/file_util.h>
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/*
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* Disable diagnostics in the code generated by Flex.
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*/
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DIAG_OFF_FLEX
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typedef struct {
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uat_t* uat;
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gchar *parse_str;
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gchar* error;
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gboolean valid_record;
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guint colnum;
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gchar* ptrx;
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guint len;
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void* record;
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guint linenum;
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size_t parse_str_pos;
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} uat_load_scanner_state_t;
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/*
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* Signal a fatal error and stops parsing.
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* Since the record is internal to the parsing process, its contents must also
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* be cleared before terminating. Any values that are not handled yet (ptrx)
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* must also be freed.
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*/
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#define ERROR(fmtd) do { \
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char* fmt_str = g_strdup_printf fmtd; \
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g_free(yyextra->error); \
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yyextra->error = g_strdup_printf("%s:%d: %s",yyextra->uat->filename,yyextra->linenum,fmt_str); \
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g_free(fmt_str); \
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if (yyextra->uat->free_cb) { \
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yyextra->uat->free_cb(yyextra->record); \
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} \
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g_free(yyextra->ptrx); \
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yyterminate(); \
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} while(0)
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/*
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* Sets the field of the current (scanner-internal) record, using the parsed
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* value. If the field validation function exists and returns an error, then
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* the record is marked as invalid and an error message is stored such that it
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* can be shown after parsing. (If other errors occur after this issue, then
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* this message will be overwritten though.)
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*/
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#define SET_FIELD() \
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{ gchar* errx; \
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if (yyextra->uat->fields[yyextra->colnum].cb.chk) { \
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if ( ! yyextra->uat->fields[yyextra->colnum].cb.chk(yyextra->record, yyextra->ptrx, yyextra->len, yyextra->uat->fields[yyextra->colnum].cbdata.chk, yyextra->uat->fields[yyextra->colnum].fld_data, &errx) ) { \
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g_free(yyextra->error); \
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yyextra->error = g_strdup_printf("%s:%d: %s",yyextra->uat->filename,yyextra->linenum,errx); \
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g_free(errx); \
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yyextra->valid_record = FALSE; \
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}\
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}\
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yyextra->uat->fields[yyextra->colnum].cb.set(yyextra->record, yyextra->ptrx, yyextra->len, yyextra->uat->fields[yyextra->colnum].cbdata.chk, yyextra->uat->fields[yyextra->colnum].fld_data);\
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g_free(yyextra->ptrx);\
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yyextra->ptrx = NULL;\
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yyextra->colnum++; \
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} while(0)
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#ifdef DEBUG_UAT_LOAD
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#define DUMP_FIELD(str) \
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{ guint i; printf("%s: %s='",str,yyextra->uat->fields[yyextra->colnum].name); for(i=0;i<yyextra->len;i++) if (yyextra->uat->fields[yyextra->colnum].mode == PT_TXTMOD_HEXBYTES) { printf("%.2x ",((guint8*)yyextra->ptrx)[i]); } else putc(yyextra->ptrx[i],stdout); printf("'[%d]\n",yyextra->len); }
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#define DUMP(str) printf("%s\n",str)
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#else
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#define DUMP_FIELD(s)
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#define DUMP(s)
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#endif
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/* Modified version of YY_INPUT generated by Flex 2.91 */
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#define YY_INPUT(buf,result,max_size) \
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if ( yyextra->parse_str ) \
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{ \
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size_t n = 0; \
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size_t pslen = strlen(yyextra->parse_str); \
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if (yyextra->parse_str_pos < pslen) \
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{ \
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n = pslen - yyextra->parse_str_pos; \
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if (n > max_size) n = max_size; \
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memcpy(buf, yyextra->parse_str + yyextra->parse_str_pos, n); \
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yyextra->parse_str_pos += n; \
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} \
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result = n; \
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} \
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else \
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{ \
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errno=0; \
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while ( (result = fread(buf, 1, max_size, yyin))==0 && ferror(yyin)) \
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{ \
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if( errno != EINTR) \
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{ \
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YY_FATAL_ERROR( "input in flex scanner failed" ); \
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break; \
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} \
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errno=0; \
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clearerr(yyin); \
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} \
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}
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/*
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* XXX
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* quoted_string below fails badly on "...\\"
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* workarround in uat_save(), using /x5c and /x22
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*/
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#define YY_USER_INIT BEGIN START_OF_LINE;
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/*
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* Sleazy hack to suppress compiler warnings in yy_fatal_error().
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*/
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#define YY_EXIT_FAILURE ((void)yyscanner, 2)
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/*
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* Macros for the allocators, to discard the extra argument.
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*/
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#define uat_load_alloc(size, yyscanner) (void *)malloc(size)
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#define uat_load_realloc(ptr, size, yyscanner) (void *)realloc((char *)(ptr), (size))
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#define uat_load_free(ptr, yyscanner) free((char *)ptr)
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%}
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quoted_string \042([^\042]|\134\042)*\042
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binstring ([0-9a-zA-Z][0-9a-zA-Z])*
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separator [ \t]*,
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newline [ \t]*[\r]?\n
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ws [ \t]+
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comment #[^\n]*\n
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%x START_OF_LINE NEXT_FIELD SEPARATOR END_OF_RECORD ERRORED
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%%
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<START_OF_LINE,NEXT_FIELD>{ws} ;
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<START_OF_LINE>{newline} yyextra->linenum++;
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<START_OF_LINE>{comment} yyextra->linenum++;
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<START_OF_LINE,NEXT_FIELD>{separator} {
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yyextra->ptrx = g_strdup("");
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yyextra->len = 0;
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DUMP_FIELD("empty->next");
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SET_FIELD();
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if ( yyextra->colnum >= yyextra->uat->ncols ) {
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ERROR(("more fields than required"));
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}
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BEGIN NEXT_FIELD;
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}
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<START_OF_LINE,NEXT_FIELD>{newline} {
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yyextra->ptrx = g_strdup("");
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yyextra->len = 0;
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BEGIN END_OF_RECORD;
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yyless((int) yyleng);
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}
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<START_OF_LINE,NEXT_FIELD>{quoted_string} {
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yyextra->ptrx = uat_undquote(yytext, (guint) yyleng, &yyextra->len);
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if (yyextra->colnum < yyextra->uat->ncols - 1) {
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DUMP("quoted_str->s");
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BEGIN SEPARATOR;
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} else {
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DUMP("quoted_str->eor");
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BEGIN END_OF_RECORD;
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}
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}
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<START_OF_LINE,NEXT_FIELD>{binstring} {
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yyextra->ptrx = uat_unbinstring(yytext, (guint) yyleng, &yyextra->len);
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if (!yyextra->ptrx) {
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ERROR(("uneven hexstring for field %s",yyextra->uat->fields[yyextra->colnum].name));
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}
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if ( yyextra->colnum < yyextra->uat->ncols - 1 ) {
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DUMP("binstring->s");
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BEGIN SEPARATOR;
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} else {
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DUMP("binstring->eor");
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BEGIN END_OF_RECORD;
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}
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}
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<SEPARATOR>{separator} {
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DUMP_FIELD("separator->next");
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SET_FIELD();
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if ( yyextra->colnum >= yyextra->uat->ncols ) {
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ERROR(("more fields than required"));
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}
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BEGIN NEXT_FIELD;
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}
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<SEPARATOR>{newline} {
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yyextra->linenum++;
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ERROR(("expecting field %s in previous line",yyextra->uat->fields[yyextra->colnum].name));
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}
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<SEPARATOR>. {
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ERROR(("unexpected char '%s' while looking for field %s",yytext,yyextra->uat->fields[yyextra->colnum].name));
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}
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<END_OF_RECORD>{separator} {
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ERROR(("more fields than required"));
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}
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<END_OF_RECORD>{newline} {
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void* rec;
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char* err = NULL;
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yyextra->linenum++;
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DUMP_FIELD("newline->start");
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SET_FIELD();
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/* Last field was processed, try to store the full record in the UAT. */
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rec = uat_add_record(yyextra->uat, yyextra->record, yyextra->valid_record);
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if ((yyextra->uat->update_cb) && (rec != NULL)) {
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if (!yyextra->uat->update_cb(rec,&err)) {
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g_free(yyextra->error);
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yyextra->error = err;
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yyterminate();
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}
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}
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/* The record was duplicated to the UAT above, now free our fields. */
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if (yyextra->uat->free_cb) {
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yyextra->uat->free_cb(yyextra->record);
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}
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memset(yyextra->record, 0, yyextra->uat->record_size);
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yyextra->valid_record = TRUE;
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yyextra->colnum = 0;
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yyextra->ptrx = NULL;
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yyextra->len = 0;
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BEGIN START_OF_LINE;
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}
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<END_OF_RECORD>. {
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ERROR(("unexpected char while looking for end of line"));
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}
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<ERRORED>{newline} { yyextra->linenum++; BEGIN START_OF_LINE; }
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<ERRORED>. ;
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{newline} { yyextra->linenum++; ERROR(("incomplete record")); }
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. { ERROR(("unexpected input")); }
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%%
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/*
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* Turn diagnostics back on, so we check the code that we've written.
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*/
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DIAG_ON_FLEX
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gboolean
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uat_load(uat_t *uat, char **errx)
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{
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gchar *fname = uat_get_actual_filename(uat, FALSE);
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FILE *in;
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yyscan_t scanner;
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uat_load_scanner_state_t state;
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if (!fname) {
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UAT_UPDATE(uat);
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if (uat->post_update_cb)
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uat->post_update_cb();
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return TRUE;
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}
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if (!(in = ws_fopen(fname,"r"))) {
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*errx = g_strdup(g_strerror(errno));
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g_free(fname);
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return FALSE;
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}
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if (uat_load_lex_init(&scanner) != 0) {
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*errx = g_strdup(g_strerror(errno));
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fclose(in);
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g_free(fname);
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return FALSE;
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}
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uat_load_set_in(in, scanner);
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state.uat = uat;
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state.parse_str = NULL; /* we're reading from a file */
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state.error = NULL;
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state.valid_record = TRUE;
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state.colnum = 0;
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state.ptrx = NULL;
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state.len = 0;
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state.record = g_malloc0(uat->record_size);
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state.linenum = 1;
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state.parse_str_pos = 0;
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DUMP(fname);
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g_free(fname); /* we're done with the file name now */
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/* Associate the state with the scanner */
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uat_load_set_extra(&state, scanner);
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uat_load_lex(scanner);
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uat_load_lex_destroy(scanner);
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g_free(state.record);
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fclose(in);
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uat->changed = FALSE;
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uat->loaded = TRUE;
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UAT_UPDATE(uat);
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if (state.error) {
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*errx = state.error;
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return FALSE;
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}
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if (uat->post_update_cb)
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uat->post_update_cb();
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*errx = NULL;
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return TRUE;
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}
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gboolean
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uat_load_str(uat_t *uat, char *entry, char **err)
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{
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yyscan_t scanner;
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uat_load_scanner_state_t state;
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state.uat = uat;
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state.parse_str = g_strdup_printf("%s\n", entry); /* Records must end with a newline */
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state.error = NULL;
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state.valid_record = TRUE;
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state.colnum = 0;
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state.ptrx = NULL;
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state.len = 0;
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state.record = g_malloc0(uat->record_size);
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state.linenum = 1;
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state.parse_str_pos = 0;
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if (uat_load_lex_init(&scanner) != 0) {
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*err = g_strdup(g_strerror(errno));
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g_free(state.parse_str);
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g_free(state.record);
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return FALSE;
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}
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DUMP(entry);
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/* Associate the state with the scanner */
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uat_load_set_extra(&state, scanner);
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uat_load_lex(scanner);
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uat_load_lex_destroy(scanner);
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g_free(state.record);
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g_free(state.parse_str);
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uat->changed = TRUE;
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uat->loaded = TRUE;
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UAT_UPDATE(uat);
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if (state.error) {
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*err = state.error;
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return FALSE;
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}
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if (uat->post_update_cb)
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uat->post_update_cb();
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*err = NULL;
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return TRUE;
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}
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