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/* Generated by re2c */
#line 1 "strip_002.re"
// re2c $INPUT -o $OUTPUT -s
/* re2c lesson 002_strip_comments, strip_002, (c) M. Boerger 2006 - 2007 */
#line 32 "strip_002.re"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#line 13 "strip_002.c"
#define YYMAXFILL 2
#line 38 "strip_002.re"
#define BSIZE 128
#if BSIZE < YYMAXFILL
# error BSIZE must be greater YYMAXFILL
#endif
#define YYCTYPE unsigned char
#define YYCURSOR s.cur
#define YYLIMIT s.lim
#define YYMARKER s.mrk
#define YYFILL(n) { if ((res = fill(&s, n)) >= 0) break; }
typedef struct Scanner
{
FILE *fp;
unsigned char *cur, *tok, *lim, *eof, *mrk;
unsigned char buffer[BSIZE];
} Scanner;
int fill(Scanner *s, int len)
{
if (!len)
{
s->cur = s->tok = s->lim = s->mrk = s->buffer;
s->eof = 0;
}
if (!s->eof)
{
int got, cnt = s->tok - s->buffer;
if (cnt > 0)
{
memcpy(s->buffer, s->tok, s->lim - s->tok);
s->tok -= cnt;
s->cur -= cnt;
s->lim -= cnt;
s->mrk -= cnt;
}
cnt = BSIZE - cnt;
if ((got = fread(s->lim, 1, cnt, s->fp)) != cnt)
{
s->eof = &s->lim[got];
}
s->lim += got;
}
else if (s->cur + len > s->eof)
{
return 0; /* not enough input data */
}
return -1;
}
void echo(Scanner *s)
{
fwrite(s->tok, 1, s->cur - s->tok, stdout);
}
int scan(FILE *fp)
{
int res = 0;
Scanner s;
if (!fp)
{
return 1; /* no file was opened */
}
s.fp = fp;
fill(&s, 0);
for(;;)
{
s.tok = s.cur;
#line 92 "strip_002.c"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych == '/') goto yy2;
++YYCURSOR;
yy1:
#line 122 "strip_002.re"
{ fputc(*s.tok, stdout); continue; }
#line 102 "strip_002.c"
yy2:
yych = *++YYCURSOR;
if (yych == '*') goto yy3;
if (yych == '/') goto yy4;
goto yy1;
yy3:
++YYCURSOR;
#line 121 "strip_002.re"
{ goto comment; }
#line 112 "strip_002.c"
yy4:
++YYCURSOR;
#line 120 "strip_002.re"
{ goto cppcomment; }
#line 117 "strip_002.c"
}
#line 123 "strip_002.re"
comment:
s.tok = s.cur;
#line 124 "strip_002.c"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych == '*') goto yy7;
++YYCURSOR;
yy6:
#line 128 "strip_002.re"
{ goto comment; }
#line 134 "strip_002.c"
yy7:
yych = *++YYCURSOR;
if (yych != '/') goto yy6;
++YYCURSOR;
#line 127 "strip_002.re"
{ goto commentws; }
#line 141 "strip_002.c"
}
#line 129 "strip_002.re"
commentws:
s.tok = s.cur;
#line 148 "strip_002.c"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych <= '\f') {
if (yych <= 0x08) goto yy9;
if (yych <= '\t') goto yy10;
if (yych <= '\n') goto yy12;
} else {
if (yych <= '\r') goto yy13;
if (yych == ' ') goto yy10;
}
yy9:
++YYCURSOR;
#line 135 "strip_002.re"
{ echo(&s); continue; }
#line 165 "strip_002.c"
yy10:
++YYCURSOR;
yy11:
#line 134 "strip_002.re"
{ goto commentws; }
#line 171 "strip_002.c"
yy12:
++YYCURSOR;
#line 133 "strip_002.re"
{ echo(&s); continue; }
#line 176 "strip_002.c"
yy13:
yych = *++YYCURSOR;
if (yych == '\n') goto yy12;
goto yy11;
}
#line 136 "strip_002.re"
cppcomment:
s.tok = s.cur;
#line 187 "strip_002.c"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych == '\n') goto yy16;
if (yych == '\r') goto yy17;
++YYCURSOR;
yy15:
#line 141 "strip_002.re"
{ goto cppcomment; }
#line 198 "strip_002.c"
yy16:
++YYCURSOR;
#line 140 "strip_002.re"
{ echo(&s); continue; }
#line 203 "strip_002.c"
yy17:
yych = *++YYCURSOR;
if (yych == '\n') goto yy16;
goto yy15;
}
#line 142 "strip_002.re"
}
if (fp != stdin)
{
fclose(fp); /* close only if not stdin */
}
return res; /* return result */
}
int main(int argc, char **argv)
{
if (argc > 1)
{
return scan(!strcmp(argv[1], "-") ? stdin : fopen(argv[1], "r"));
}
else
{
fprintf(stderr, "%s <expr>\n", argv[0]);
return 1;
}
}
|
