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/
usr/
share/
doc/
re2c/
examples/
lessons/
002_strip_comments/
- drwxr-xr-x
|
Viewing file:  strip_001.s.c (3.11 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/* Generated by re2c */
#line 1 "strip_001.s.re"
/* re2c lesson 002_strip_comments, strip_001.s, (c) M. Boerger 2006 - 2007 */
#line 32 "strip_001.s.re"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define YYMAXFILL 2
#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 YYFILL(n) { if ((res = fill(&s, n)) >= 0) break; }
typedef struct Scanner
{
FILE *fp;
unsigned char *cur, *tok, *lim, *eof;
unsigned char buffer[BSIZE];
} Scanner;
int fill(Scanner *s, int len)
{
if (!len)
{
s->cur = s->tok = s->lim = 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;
}
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;
}
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 80 "<stdout>"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych != '/') goto yy4;
++YYCURSOR;
if ((yych = *YYCURSOR) == '*') goto yy5;
if (yych == '/') goto yy7;
yy3:
#line 113 "strip_001.s.re"
{ fputc(*s.tok, stdout); continue; }
#line 93 "<stdout>"
yy4:
yych = *++YYCURSOR;
goto yy3;
yy5:
++YYCURSOR;
#line 112 "strip_001.s.re"
{ goto comment; }
#line 101 "<stdout>"
yy7:
++YYCURSOR;
#line 111 "strip_001.s.re"
{ goto cppcomment; }
#line 106 "<stdout>"
}
#line 114 "strip_001.s.re"
comment:
s.tok = s.cur;
#line 113 "<stdout>"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych != '*') goto yy13;
++YYCURSOR;
if ((yych = *YYCURSOR) == '/') goto yy14;
yy12:
#line 119 "strip_001.s.re"
{ goto comment; }
#line 124 "<stdout>"
yy13:
yych = *++YYCURSOR;
goto yy12;
yy14:
++YYCURSOR;
#line 118 "strip_001.s.re"
{ continue; }
#line 132 "<stdout>"
}
#line 120 "strip_001.s.re"
cppcomment:
s.tok = s.cur;
#line 139 "<stdout>"
{
YYCTYPE yych;
if ((YYLIMIT - YYCURSOR) < 2) YYFILL(2);
yych = *YYCURSOR;
if (yych == '\n') goto yy20;
if (yych != '\r') goto yy22;
++YYCURSOR;
if ((yych = *YYCURSOR) == '\n') goto yy23;
yy19:
#line 125 "strip_001.s.re"
{ goto cppcomment; }
#line 151 "<stdout>"
yy20:
++YYCURSOR;
yy21:
#line 124 "strip_001.s.re"
{ fwrite(s.tok, 1, s.cur - s.tok, stdout); continue; }
#line 157 "<stdout>"
yy22:
yych = *++YYCURSOR;
goto yy19;
yy23:
++YYCURSOR;
yych = *YYCURSOR;
goto yy21;
}
#line 126 "strip_001.s.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;
}
}
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