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%{
#include <config.h>
#include <stdlib.h>
#include <stdint.h>
#include "expr.h"
#include "ifalive.h"
#define RET_STAT(s) { yylval.field = s; return FIELD; }
#undef YY_INPUT
#define YY_INPUT(buf,result,max_size) result = fillbuf(buf, max_size)
static int lex_argc;
static char **lex_argv;
static int lex_argi;
static char *lex_curp;
static size_t
fillbuf(char *buf, size_t max_size)
{
size_t consumed = 0;
while (consumed < max_size) {
size_t n;
if (!*lex_curp) {
if (lex_argi == lex_argc)
break;
if (lex_argi)
buf[consumed++] = ' ';
lex_curp = lex_argv[lex_argi++];
}
n = strlen(lex_curp);
if (n > max_size - consumed)
n = max_size - consumed;
memcpy(buf + consumed, lex_curp, n);
lex_curp += n;
consumed += n;
}
return consumed;
}
void
lex_init(int argc, char **argv)
{
lex_argc = argc;
lex_argv = argv;
lex_argi = 1;
lex_curp = argv[0];
}
void
yyerror(char const *s)
{
if (lex_curp)
error(0, "%s (near %s)", s, lex_curp);
else
error(0, "%s (at the end of input)", s);
}
static int
yywrap(void)
{
return 1;
}
%}
%%
"or" return OR;
"and" return AND;
"=" return EQ;
"==" return EQ;
"!=" return NE;
"<" return LT;
"<=" return LE;
">" return GT;
">=" return GE;
"!" return NOT;
rx_bytes RET_STAT(stat_rx_bytes);
rx_packets RET_STAT(stat_rx_packets);
rx_errors RET_STAT(stat_rx_errors);
rx_dropped RET_STAT(stat_rx_dropped);
rx_fifo_errors RET_STAT(stat_rx_fifo_errors);
rx_frame_errors RET_STAT(stat_rx_frame_errors);
rx_compressed RET_STAT(stat_rx_compressed);
rx_multicast RET_STAT(stat_rx_multicast);
tx_bytes RET_STAT(stat_tx_bytes);
tx_packets RET_STAT(stat_tx_packets);
tx_errors RET_STAT(stat_tx_errors);
tx_dropped RET_STAT(stat_tx_dropped);
tx_fifo_errors RET_STAT(stat_tx_fifo_errors);
collisions RET_STAT(stat_collisions);
tx_carrier_errors RET_STAT(stat_tx_carrier_errors);
tx_compressed RET_STAT(stat_tx_compressed);
a { yylval.var = VAR_PREV; return VAR; }
b { yylval.var = VAR_THIS; return VAR; }
[0-9][0-9]* { yylval.value = strtoumax(yytext, NULL, 10);
return VALUE; }
[ \t\n] ;
. return yytext[0];
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