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%x PRNT
%x EVAL
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void apnd();
void eval();
void text();
void prnt();
char *buf;
int len;
int sz;
%%
(.|\n) apnd();
\<%= text(); BEGIN(PRNT);
\<%[^=] text(); BEGIN(EVAL);
<PRNT>. apnd();
<PRNT>%\> prnt(); BEGIN(0);
<EVAL>(.|\n) apnd();
<EVAL>%\> eval(); BEGIN(0);
<PRNT><<EOF>> prnt(); yyterminate();
<EVAL><<EOF>> eval(); yyterminate();
<<EOF>> text(); yyterminate();
%%
int
main(int argc, char *argv[])
{
len = 0;
sz = 512;
if(!(buf = malloc(sz)))
err(1, "malloc");
yylex();
}
void
apnd()
{
if(len+1 > sz){
sz += 512;
if(!(buf = realloc(buf, sz)))
err(1, "realloc");
}
buf[len++] = *yytext;
buf[len+1] = 0;
}
void
eval()
{
printf("%s\n", buf);
len = 0;
}
void
text()
{
char *t;
printf("printf(\"");
for(t = buf; *t; t++){
if(*t == '\\') printf("\\\\");
else if(*t == '"') printf("\\\"");
else if(*t == '\n') printf("\\n");
else printf("%c", *t);
}
printf("\");\n");
len = 0;
}
void
prnt()
{
printf("printf(\"%%s\", %s);\n", buf);
len = 0;
}
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