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lex.l
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lex.l
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/*
* Copyright (c) 2006 by Keith Packard
* Copyright (c) 2017, 2020 Tuxera US Inc
* SPDX-License-Identifier: GPL-2.0-or-later
*
* Lex/Flex parser for MKSSI-style RCS files.
*/
%{
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <ctype.h>
#include "interfaces.h"
#include "gram.h"
static char *parse_data(yyscan_t scanner);
static void parse_text(struct rcs_text *text, yyscan_t scanner,
struct rcs_file *file);
static void fast_export_sanitize(yyscan_t scanner, struct rcs_file *file);
#define YY_INPUT(buf, result, max_size) { \
int c = getc(yyget_in(yyscanner)); \
result = (c == EOF) ? YY_NULL : (buf[0] = c, 1); \
}
YY_DECL;
%}
%option reentrant bison-bridge
%option warn nodefault
%option pointer
%option noyywrap noyyget_extra noyyget_leng noyyset_lineno
%option noyyget_out noyyset_out noyyget_lval noyyset_lval
%option noyyget_lloc noyyset_lloc noyyget_debug noyyset_debug
%s CONTENT SYMBOLSS SKIP AUTHORSS STORAGES FORMATS
%%
<INITIAL>head BEGIN(CONTENT); return HEAD;
<INITIAL>branch BEGIN(CONTENT); return BRANCH;
<INITIAL>access return ACCESS;
<INITIAL>symbols BEGIN(SYMBOLSS); return SYMBOLS;
<INITIAL>locks BEGIN(CONTENT); return LOCKS;
<INITIAL>storage BEGIN(STORAGES); return STORAGE;
<INITIAL>comment BEGIN(CONTENT); return COMMENT;
<INITIAL>date BEGIN(CONTENT); return DATE;
<INITIAL>branches BEGIN(CONTENT); return BRANCHES;
<INITIAL>next BEGIN(CONTENT); return NEXT;
<INITIAL>strict BEGIN(CONTENT); return STRICT;
<INITIAL>author BEGIN(AUTHORSS); return AUTHOR;
<INITIAL>state BEGIN(CONTENT); return STATE;
<INITIAL>desc return DESC;
<INITIAL>log return LOG;
<INITIAL>reference BEGIN(SKIP); return REFERENCE;
<INITIAL>ext return EXTENSION;
<INITIAL>format BEGIN(FORMATS); return FORMAT;
<INITIAL>text BEGIN(SKIP); return TEXT;
<SKIP>@ {
parse_text(&yylval->text, yyscanner, file);
BEGIN(INITIAL);
return TEXT_DATA;
}
<CONTENT>[-a-zA-Z_+%][-a-zA-Z_0-9+/%=.~^\\*?#!\[\]()<>]* {
fast_export_sanitize(yyscanner, file);
yylval->s = xstrdup(yytext, "lex.l:CONTENT");
return TOKEN;
}
<AUTHORSS>[-a-zA-Z_0-9+%][-a-zA-Z_0-9+/%=.~^\\*?]* {
fast_export_sanitize(yyscanner, file);
yylval->s = xstrdup(yytext, "lex.l:AUTHORSS");
return TOKEN;
}
<STORAGES>reference BEGIN(CONTENT); return REFERENCE;
<FORMATS>binary BEGIN(INITIAL); return FMTBINARY;
<FORMATS>text BEGIN(INITIAL); return FMTTEXT;
[0-9]+\.[0-9.]* {
yylval->number = lex_number(yytext);
return NUMBER;
}
<SYMBOLSS>[-a-zA-Z_0-9+/%=.~^\\*?#!\[\]()<>\*&]+ {
fast_export_sanitize(yyscanner, file);
yylval->s = xstrdup(yytext, "lex.l:SYMBOLSS");
return TOKEN;
}
; BEGIN(INITIAL); return SEMI;
: return COLON;
<INITIAL,CONTENT>@ {
yylval->s = parse_data(yyscanner);
return DATA;
}
" " ;
\t ;
\n ;
<INITIAL>. {
fprintf(stderr, "%s:%d unrecognized input %c\n",
file->master_name, yylineno, yytext[0]);
return CORRUPT;
}
. {
fatal_error("%s:%d unrecognized input %c\n", file->master_name,
yylineno, yytext[0]);
}
%%
/*
* A variable-length buffer, allocated on the stack first but can grow to use
* the heap.
*/
struct varbuf {
unsigned int max, cur;
char *string;
char buf[1024];
};
/* initialize a variable-length string buffer */
static void
varbuf_init(struct varbuf *buf)
{
buf->max = sizeof buf->buf;
buf->cur = 0;
buf->string = buf->buf;
}
/* append a character to a variable length string buffer */
static void
varbuf_add(struct varbuf *buf, char c)
{
if (buf->cur == buf->max) {
if (buf->string == buf->buf) {
buf->max *= 2;
buf->string = xmalloc(buf->max, __func__);
memcpy(buf->string, buf->buf, buf->cur);
} else {
buf->max *= 2;
buf->string = xrealloc(buf->string, buf->max, __func__);
}
}
buf->string[buf->cur++] = c;
}
/* free a variable length string buffer */
static void
varbuf_free(struct varbuf *buf)
{
if (buf->string != buf->buf)
free(buf->string);
}
/* copy the string from a variable-length string buffer */
static char *
varbuf_dup(const struct varbuf *buf, const char *legend)
{
char *dup;
dup = xmalloc(buf->cur, legend);
memcpy(dup, buf->string, buf->cur);
return dup;
}
/* parse textual data from an RCS metadata field */
static char *
parse_data(yyscan_t yyscanner)
{
int c;
char *ret;
struct varbuf buf;
varbuf_init(&buf);
for (;;) {
c = getc(yyget_in(yyscanner));
if (c == '@') {
c = getc(yyget_in(yyscanner));
if (c != '@')
break;
}
varbuf_add(&buf, c);
}
ungetc(c, yyget_in(yyscanner));
varbuf_add(&buf, '\0');
ret = varbuf_dup(&buf, __func__);
varbuf_free(&buf);
return ret;
}
/* parse a "text" block from an RCS file */
static void
parse_text(struct rcs_text *text, yyscan_t yyscanner, struct rcs_file *file)
{
int c;
size_t length;
text->offset = ftell(yyget_in(yyscanner)) - 1;
length = 1;
while ((c = getc(yyget_in(yyscanner))) != EOF) {
++length;
if (c == '@') {
/* lookahead to see if we hit @@ */
c = getc(yyget_in(yyscanner));
if (c == '@') {
++length;
} else {
/*
* We consume only the closing single @, leaving
* it included in the length
*/
ungetc(c, yyget_in(yyscanner));
break;
}
}
}
text->length = length;
}
/* parse a number with multiple fields separated by periods (like "1.7.1.42") */
struct rcs_number
lex_number(const char *s)
{
struct rcs_number n;
const char *next;
n.c = 0;
while (*s) {
n.n[n.c] = (short)strtol(s, (char **)&next, 10);
if (next == s)
break;
if (*next == '.')
next++;
s = next;
if (n.c > RCS_MAX_DEPTH)
fatal_error(
"revision too long, increase RCS_MAX_DEPTH");
n.c++;
}
return n;
}
/* convert date/time fields into Unix time and time string */
struct rcs_timestamp
lex_date(const struct rcs_number *n, yyscan_t yyscanner,
const struct rcs_file *file)
{
struct rcs_timestamp ts;
struct tm tm;
int i;
tm.tm_year = n->n[0];
if (tm.tm_year > 1900)
tm.tm_year -= 1900;
tm.tm_mon = n->n[1] - 1;
tm.tm_mday = n->n[2];
tm.tm_hour = n->n[3];
tm.tm_min = n->n[4];
tm.tm_sec = n->n[5];
tm.tm_isdst = -1;
tm.tm_zone = 0;
ts.value = mktime(&tm);
if (!ts.value) {
fprintf(stderr, "%s: (%d) unparsable date: ",
file->master_name, yyget_lineno(yyscanner));
for (i = 0; i < n->c; i++) {
if (i)
fprintf(stderr, ".");
fprintf(stderr, "%d", n->n[i]);
}
fprintf(stderr, "\n");
}
/*
* Store the timestamp as a string. In almost all cases, this could be
* derived from the Unix time value; but there is an edge case involving
* the hour skipped by daylight saving time (DST). For example, an
* MKSSI file revision might have the following timestamp:
*
* 2009/03/08 02:29:46Z
*
* Now in 2009, DST started on March 8th at 2 a.m. The above timestamp
* thus falls into the hour which was skipped. As a result, when the
* timestamp is converted into Unix time by mktime() (see above) and
* converted back with localtime() and strftime(), it ends up an hour
* off:
*
* 2009/03/08 03:29:46Z
*
* To avoid this problem, allocate a timestamp string here using the
* values from the RCS metadata, rather than deriving it later from the
* Unix time.
*/
ts.string = sprintf_alloc("%04u/%02u/%02u %02u:%02u:%02uZ",
n->n[0], n->n[1], n->n[2], n->n[3], n->n[4], n->n[5]);
return ts;
}
/* extract a username from an MKSSI locker string */
char *
lex_locker(const char *locker)
{
const char *p;
char *usr;
size_t len;
/*
* MKSSI locker strings are a username followed by a timestamp in
* parentheses, for example:
*
* johndoe(2020.01.01.00.00.00)
*
* For now, we don't care about the timestamp. We only need the
* username.
*/
for (p = locker; *p && *p != '('; ++p);
;
len = p - locker;
usr = xmalloc(len+1, __func__);
memcpy(usr, locker, len);
usr[len] = '\0';
return usr;
}
#define SUFFIX(a, s) \
((strlen(a) >= strlen(s)) && !strcmp((a) + strlen(a) - strlen(s), (s)))
static void
fast_export_sanitize(yyscan_t yyscanner, struct rcs_file *file)
{
char *sp, *tp;
size_t len;
int ch;
for (sp = tp = yyget_text(yyscanner); *sp; sp += len) {
/*
* TODO: Fix to enforce all the rules:
* https://git-scm.com/docs/git-check-ref-format
*/
len = parse_mkssi_branch_char(sp, &ch);
if (ch == -1)
continue;
*tp++ = (char)ch;
if (SUFFIX(yyget_text(yyscanner), "@{") ||
SUFFIX(yyget_text(yyscanner), "..")) {
fatal_error("%s: (%d) tag or branch name %s is "
"ill-formed.", file->master_name,
yyget_lineno(yyscanner),
yyget_text(yyscanner));
}
}
*tp = '\0';
if (!strlen(yyget_text(yyscanner))) {
fatal_error("%s: (%d) tag or branch name was empty after "
"sanitization.", file->master_name,
yyget_lineno(yyscanner));
}
}