Re^4: Reading a huge input line in parts

in reply to Re^3: Reading a huge input line in parts
in thread Reading a huge input line in parts

That's actually a very good idea, haven't thought about this approach.

Comment on Re^4: Reading a huge input line in parts

Replies are listed 'Best First'.
Re^5: Reading a huge input line in parts by Anonymous Monk on May 05, 2015 at 21:48 UTC
You can also use flex to make a scanner with very little fuss. For example: `%{ void process(char tok); %} %option noyywrap %% [0-9]+ process(yytext); [ \t\n]+ / ignore / . / printf("Bad input character: %s\n", yytext); / %% void process(char tok) { printf("%d\n", atoi(tok)); } int main(int argc, char **argv) { yyin = stdin; if (argc > 1) yyin = fopen(argv[1], "r"); return yylex(); }` [download] Just run it through flex and compile the generated lex.yy.c.	[reply] [d/l]

Replies are listed 'Best First'.

Re^5: Reading a huge input line in parts
by Anonymous Monk on May 05, 2015 at 21:48 UTC

You can also use flex to make a scanner with very little fuss. For example:

%{
void process(char *tok);
%}

%option noyywrap

%%

[0-9]+     process(yytext);

[ \t\n]+   /* ignore */

.          /* printf("Bad input character: %s\n", yytext); */

%%

void process(char *tok)
{
    printf("%d\n", atoi(tok));
}

int main(int argc, char **argv)
{
    yyin = stdin;

    if (argc > 1)
        yyin = fopen(argv[1], "r");

    return yylex();
}
[download]

Just run it through flex and compile the generated lex.yy.c.

[reply]
[d/l]

In Section Seekers of Perl Wisdom