scan.l revision 256281
1%{ 2/* $OpenBSD: scan.l,v 1.23 2009/10/27 23:59:36 deraadt Exp $ */ 3 4/* 5 * Copyright (c) 2003, Otto Moerbeek <otto@drijf.net> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include <sys/cdefs.h> 21__FBSDID("$FreeBSD: stable/10/usr.bin/bc/scan.l 250926 2013-05-23 05:42:35Z jkim $"); 22 23#include <err.h> 24#include <errno.h> 25#include <histedit.h> 26#include <stdbool.h> 27#include <string.h> 28#include <unistd.h> 29 30#include "extern.h" 31#include "bc.h" 32#include "pathnames.h" 33 34int lineno; 35 36bool interactive; 37HistEvent he; 38EditLine *el; 39History *hist; 40 41static char *strbuf = NULL; 42static size_t strbuf_sz = 1; 43static bool dot_seen; 44 45static void init_strbuf(void); 46static void add_str(const char *); 47static int bc_yyinput(char *, int); 48 49#define YY_DECL int yylex(void) 50#define YY_NO_INPUT 51#undef YY_INPUT 52#define YY_INPUT(buf,retval,max) \ 53 (retval = bc_yyinput(buf, max)) 54%} 55 56%option always-interactive 57 58DIGIT [0-9A-F] 59ALPHA [a-z_] 60ALPHANUM [a-z_0-9] 61 62%x comment string number 63 64%% 65 66"/*" BEGIN(comment); 67<comment>{ 68 "*/" BEGIN(INITIAL); 69 \n lineno++; 70 \* ; 71 [^*\n]+ ; 72 <<EOF>> fatal("end of file in comment"); 73} 74 75\" BEGIN(string); init_strbuf(); 76<string>{ 77 [^"\n\\\[\]]+ add_str(yytext); 78 \[ add_str("\\["); 79 \] add_str("\\]"); 80 \\ add_str("\\\\"); 81 \n add_str("\n"); lineno++; 82 \" BEGIN(INITIAL); yylval.str = strbuf; return STRING; 83 <<EOF>> fatal("end of file in string"); 84} 85 86{DIGIT}+ { 87 BEGIN(number); 88 dot_seen = false; 89 init_strbuf(); 90 add_str(yytext); 91 } 92\. { 93 BEGIN(number); 94 dot_seen = true; 95 init_strbuf(); 96 add_str("."); 97 } 98<number>{ 99 {DIGIT}+ add_str(yytext); 100 \. { 101 if (dot_seen) { 102 BEGIN(INITIAL); 103 yylval.str = strbuf; 104 unput('.'); 105 return (NUMBER); 106 } else { 107 dot_seen = true; 108 add_str("."); 109 } 110 } 111 \\\n[ \t]* lineno++; 112 [^0-9A-F\.] { 113 BEGIN(INITIAL); 114 unput(yytext[0]); 115 if (strcmp(strbuf, ".") == 0) 116 return (DOT); 117 else { 118 yylval.str = strbuf; 119 return (NUMBER); 120 } 121 } 122} 123 124"auto" return (AUTO); 125"break" return (BREAK); 126"continue" return (CONTINUE); 127"define" return (DEFINE); 128"else" return (ELSE); 129"ibase" return (IBASE); 130"if" return (IF); 131"last" return (DOT); 132"for" return (FOR); 133"length" return (LENGTH); 134"obase" return (OBASE); 135"print" return (PRINT); 136"quit" return (QUIT); 137"return" return (RETURN); 138"scale" return (SCALE); 139"sqrt" return (SQRT); 140"while" return (WHILE); 141 142"^" return (EXPONENT); 143"*" return (MULTIPLY); 144"/" return (DIVIDE); 145"%" return (REMAINDER); 146 147"!" return (BOOL_NOT); 148"&&" return (BOOL_AND); 149"||" return (BOOL_OR); 150 151"+" return (PLUS); 152"-" return (MINUS); 153 154"++" return (INCR); 155"--" return (DECR); 156 157"=" yylval.str = ""; return (ASSIGN_OP); 158"+=" yylval.str = "+"; return (ASSIGN_OP); 159"-=" yylval.str = "-"; return (ASSIGN_OP); 160"*=" yylval.str = "*"; return (ASSIGN_OP); 161"/=" yylval.str = "/"; return (ASSIGN_OP); 162"%=" yylval.str = "%"; return (ASSIGN_OP); 163"^=" yylval.str = "^"; return (ASSIGN_OP); 164 165"==" return (EQUALS); 166"<=" return (LESS_EQ); 167">=" return (GREATER_EQ); 168"!=" return (UNEQUALS); 169"<" return (LESS); 170">" return (GREATER); 171 172"," return (COMMA); 173";" return (SEMICOLON); 174 175"(" return (LPAR); 176")" return (RPAR); 177 178"[" return (LBRACKET); 179"]" return (RBRACKET); 180 181"{" return (LBRACE); 182"}" return (RBRACE); 183 184{ALPHA}{ALPHANUM}* { 185 /* alloc an extra byte for the type marker */ 186 char *p = malloc(yyleng + 2); 187 if (p == NULL) 188 err(1, NULL); 189 strlcpy(p, yytext, yyleng + 1); 190 yylval.astr = p; 191 return (LETTER); 192 } 193 194\\\n lineno++; 195\n lineno++; return (NEWLINE); 196 197#[^\n]* ; 198[ \t] ; 199<<EOF>> return (QUIT); 200. yyerror("illegal character"); 201 202%% 203 204static void 205init_strbuf(void) 206{ 207 208 if (strbuf == NULL) { 209 strbuf = malloc(strbuf_sz); 210 if (strbuf == NULL) 211 err(1, NULL); 212 } 213 strbuf[0] = '\0'; 214} 215 216static void 217add_str(const char *str) 218{ 219 size_t arglen; 220 221 arglen = strlen(str); 222 223 if (strlen(strbuf) + arglen + 1 > strbuf_sz) { 224 size_t newsize; 225 char *p; 226 227 newsize = strbuf_sz + arglen + 1; 228 p = realloc(strbuf, newsize); 229 if (p == NULL) { 230 free(strbuf); 231 err(1, NULL); 232 } 233 strbuf_sz = newsize; 234 strbuf = p; 235 } 236 strlcat(strbuf, str, strbuf_sz); 237} 238 239int 240yywrap(void) 241{ 242 static YY_BUFFER_STATE buf; 243 static int state; 244 245 if (fileindex == 0 && sargc > 0 && strcmp(sargv[0], _PATH_LIBB) == 0) { 246 filename = sargv[fileindex++]; 247 yyin = fopen(filename, "r"); 248 lineno = 1; 249 if (yyin == NULL) 250 err(1, "cannot open %s", filename); 251 return (0); 252 } 253 if (state == 0 && cmdexpr[0] != '\0') { 254 buf = yy_scan_string(cmdexpr); 255 state++; 256 lineno = 1; 257 filename = "command line"; 258 return (0); 259 } else if (state == 1) { 260 yy_delete_buffer(buf); 261 free(cmdexpr); 262 state++; 263 } 264 if (yyin != NULL && yyin != stdin) 265 fclose(yyin); 266 if (fileindex < sargc) { 267 filename = sargv[fileindex++]; 268 yyin = fopen(filename, "r"); 269 lineno = 1; 270 if (yyin == NULL) 271 err(1, "cannot open %s", filename); 272 return (0); 273 } else if (fileindex == sargc) { 274 fileindex++; 275 yyin = stdin; 276 lineno = 1; 277 filename = "stdin"; 278 return (0); 279 } 280 return (1); 281} 282 283static int 284bc_yyinput(char *buf, int maxlen) 285{ 286 int num; 287 if (yyin == stdin && interactive) { 288 const char *bp; 289 290 if ((bp = el_gets(el, &num)) == NULL || num == 0) 291 return (0); 292 if (num > maxlen) { 293 el_push(el, (char *)(uintptr_t)(bp) + maxlen); 294 num = maxlen; 295 } 296 memcpy(buf, bp, num); 297 history(hist, &he, H_ENTER, bp); 298 } else { 299 int c = '*'; 300 for (num = 0; num < maxlen && 301 (c = getc(yyin)) != EOF && c != '\n'; ++num) 302 buf[num] = (char) c; 303 if (c == '\n') 304 buf[num++] = (char) c; 305 if (c == EOF && ferror(yyin)) 306 YY_FATAL_ERROR( "input in flex scanner failed" ); 307 } 308 return (num); 309} 310 311