/usr.bin/colldef/scan.l
https://bitbucket.org/freebsd/freebsd-head/ · LEX · 287 lines · 250 code · 11 blank · 26 comment · 0 complexity · 2a7d1884f5cf36d0b416b74572b81065 MD5 · raw file
- %x string name charmap defn nchar subs subs2
- %{
- /*-
- * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
- * at Electronni Visti IA, Kiev, Ukraine.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. 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.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <sys/types.h>
- #include <ctype.h>
- #include <err.h>
- #include <limits.h>
- #include <unistd.h>
- #include <string.h>
- #include <sysexits.h>
- #include "common.h"
- #include "y.tab.h"
- int line_no = 1, save_no, fromsubs;
- u_char buf[BUFSIZE], *ptr;
- FILE *map_fp;
- YY_BUFFER_STATE main_buf, map_buf;
- #ifdef FLEX_DEBUG
- YYSTYPE yylval;
- #endif /* FLEX_DEBUG */
- int yylex(void);
- %}
- %%
- <INITIAL,charmap,nchar,subs,subs2>[ \t]+ ;
- <subs2>\" { ptr = buf; BEGIN(string); }
- <subs>\< { ptr = buf; fromsubs = 1; BEGIN(name); }
- <INITIAL>\< { ptr = buf; fromsubs = 0; BEGIN(name); }
- ^#.*\n line_no++;
- ^\n line_no++;
- <INITIAL>\\\n line_no++;
- <INITIAL,nchar,subs>\\t { yylval.ch = '\t'; return CHAR; }
- <INITIAL,nchar,subs>\\n { yylval.ch = '\n'; return CHAR; }
- <INITIAL,nchar,subs>\\b { yylval.ch = '\b'; return CHAR; }
- <INITIAL,nchar,subs>\\f { yylval.ch = '\f'; return CHAR; }
- <INITIAL,nchar,subs>\\v { yylval.ch = '\v'; return CHAR; }
- <INITIAL,nchar,subs>\\r { yylval.ch = '\r'; return CHAR; }
- <INITIAL,nchar,subs>\\a { yylval.ch = '\a'; return CHAR; }
- <subs2>\n {
- line_no++;
- BEGIN(INITIAL);
- return '\n';
- }
- <INITIAL,nchar>\n {
- line_no++;
- if (map_fp != NULL) {
- ptr = buf;
- BEGIN(defn);
- }
- return '\n';
- }
- <INITIAL>[;,{}()] return *yytext;
- <INITIAL>substitute { BEGIN(subs); return SUBSTITUTE; }
- <subs>with { BEGIN(subs2); return WITH; }
- <INITIAL>order return ORDER;
- <INITIAL>charmap BEGIN(charmap);
- <INITIAL>;[ \t]*\.\.\.[ \t]*; return RANGE;
- <INITIAL,nchar,subs>\\[0-7]{3} {
- u_int v;
- sscanf(&yytext[1], "%o", &v);
- yylval.ch = (u_char)v;
- return CHAR;
- }
- <INITIAL,nchar,subs>\\x[0-9a-fA-F]{2} {
- u_int v;
- sscanf(&yytext[2], "%x", &v);
- yylval.ch = (u_char)v;
- return CHAR;
- }
- <INITIAL,nchar,subs>\\. { yylval.ch = yytext[1]; return CHAR; }
- <INITIAL,nchar,subs>. { yylval.ch = *yytext; return CHAR; }
- <defn>^#.*\n line_no++;
- <defn>[ \t]+ {
- if (ptr == buf)
- errx(EX_UNAVAILABLE, "map expected near line %u of %s",
- line_no, map_name);
- *ptr = '\0';
- strcpy(yylval.str, buf);
- BEGIN(nchar);
- return DEFN;
- }
- <name>\/\/ {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "name buffer overflow near line %u, character '/'",
- line_no);
- *ptr++ = '/';
- }
- <name>\/\> {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "name buffer overflow near line %u, character '>'",
- line_no);
- *ptr++ = '>';
- }
- <string>\\\" {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\"'",
- line_no);
- *ptr++ = '"';
- }
- <name>\> {
- u_int i;
- if (ptr == buf)
- errx(EX_UNAVAILABLE, "non-empty name expected near line %u",
- line_no);
- *ptr = '\0';
- for (i = 0; i <= UCHAR_MAX; i++) {
- if (strcmp(charmap_table[i], buf) == 0)
- goto findit;
- }
- errx(EX_UNAVAILABLE, "name <%s> not 'charmap'-defined near line %u",
- buf, line_no);
- findit:
- yylval.ch = i;
- if (fromsubs)
- BEGIN(subs);
- else
- BEGIN(INITIAL);
- return CHAR;
- }
- <string>\" {
- *ptr = '\0';
- strcpy(yylval.str, buf);
- BEGIN(subs2);
- return STRING;
- }
- <name,defn>. {
- const char *s = (map_fp != NULL) ? map_name : "input";
- if (!isascii(*yytext) || !isprint(*yytext))
- errx(EX_UNAVAILABLE, "non-ASCII or non-printable character 0x%02x not allowed in the map/name near line %u of %s",
- *yytext, line_no, s);
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "map/name buffer overflow near line %u of %s, character '%c'",
- line_no, s, *yytext);
- *ptr++ = *yytext;
- }
- <string>\\t {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\t'",
- line_no);
- *ptr++ = '\t';
- }
- <string>\\b {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\b'",
- line_no);
- *ptr++ = '\b';
- }
- <string>\\f {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\f'",
- line_no);
- *ptr++ = '\f';
- }
- <string>\\v {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\v'",
- line_no);
- *ptr++ = '\v';
- }
- <string>\\n {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\n'",
- line_no);
- *ptr++ = '\n';
- }
- <string>\\r {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\r'",
- line_no);
- *ptr++ = '\r';
- }
- <string>\\a {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '\\a'",
- line_no);
- *ptr++ = '\a';
- }
- <name,string,defn>\n {
- const char *s = (map_fp != NULL) ? map_name : "input";
- errx(EX_UNAVAILABLE, "unterminated map/name/string near line %u of %s", line_no, s);
- }
- <name,string,nchar><<EOF>> {
- const char *s = (map_fp != NULL) ? map_name : "input";
- errx(EX_UNAVAILABLE, "premature EOF in the name/string/char near line %u of %s", line_no, s);
- }
- <string>\\x[0-9a-f]{2} {
- u_int v;
- sscanf(&yytext[2], "%x", &v);
- *ptr++ = (u_char)v;
- }
- <string>\\[0-7]{3} {
- u_int v;
- sscanf(&yytext[1], "%o", &v);
- *ptr++ = (u_char)v;
- }
- <string>\\. {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '%c'",
- line_no, yytext[1]);
- *ptr++ = yytext[1];
- }
- <string>. {
- if(ptr >= buf + sizeof(buf) - 1)
- errx(EX_UNAVAILABLE, "string buffer overflow near line %u, character '%c'",
- line_no, *yytext);
- *ptr++ = *yytext;
- }
- <charmap>[^ \t\n]+ {
- strcat(map_name, "/");
- strcat(map_name, yytext);
- if((map_fp = fopen(map_name, "r")) == NULL)
- err(EX_UNAVAILABLE, "can't open 'charmap' file %s",
- map_name);
- save_no = line_no;
- line_no = 1;
- map_buf = yy_new_buffer(map_fp, YY_BUF_SIZE);
- main_buf = YY_CURRENT_BUFFER;
- yy_switch_to_buffer(map_buf);
- ptr = buf;
- BEGIN(defn);
- }
- <charmap>\n {
- errx(EX_UNAVAILABLE, "'charmap' file name expected near line %u",
- line_no);
- }
- <charmap><<EOF>> {
- errx(EX_UNAVAILABLE, "'charmap' file name expected near line %u",
- line_no);
- }
- <INITIAL,defn><<EOF>> {
- if(map_fp != NULL) {
- if (ptr != buf)
- errx(EX_UNAVAILABLE, "premature EOF in the map near line %u of %s", line_no, map_name);
- yy_switch_to_buffer(main_buf);
- yy_delete_buffer(map_buf);
- fclose(map_fp);
- map_fp = NULL;
- line_no = save_no;
- BEGIN(INITIAL);
- } else
- yyterminate();
- }
- %%
- #ifdef FLEX_DEBUG
- main()
- {
- while(yylex())
- ;
- return 0;
- }
- #endif /* FLEX_DEBUG */