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/*
* blobtool - Compiler/Decompiler for data blobs with specs
* Copyright (C) 2017 Damien Zammit <damien@zamaudio.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
%{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "blobtool.tab.h"
extern struct blob binary;
unsigned int parsehex (char *s)
{
unsigned int i, nib, val = 0;
unsigned int nibs = strlen(s) - 2;
for (i = 2; i < nibs + 2; i++) {
if (s[i] >= '0' && s[i] <= '9') {
nib = s[i] - '0';
} else if (s[i] >= 'a' && s[i] <= 'f') {
nib = s[i] - 'a' + 10;
} else if (s[i] >= 'A' && s[i] <= 'F') {
nib = s[i] - 'A' + 10;
} else {
return 0;
}
val |= nib << (((nibs - 1) - (i - 2)) * 4);
}
return val;
}
char* stripquotes (char *string)
{
char *stripped;
unsigned int len = strlen(string);
if (len >= 2 && string[0] == '"' && string[len - 1] == '"') {
stripped = (char *) malloc (len - 1);
if (stripped == NULL) {
printf("Out of memory\n");
exit(1);
}
snprintf (stripped, len - 1, "%s", string + 1);
return stripped;
}
return NULL;
}
%}
%option noyywrap
%option nounput
DIGIT [0-9]
INT [-]?{DIGIT}|[-]?[1-9]{DIGIT}+
FRAC [.]{DIGIT}+
EXP [eE][+-]?{DIGIT}+
NUMBER {INT}|{INT}{FRAC}|{INT}{EXP}|{INT}{FRAC}{EXP}
HEX [0][x][0-9a-fA-F]+
STRING ["][^"]*["]
COMMENT [#][^\n]*$
%%
{STRING} {
yylval.str = stripquotes(yytext);
return name;
};
{NUMBER} {
yylval.u32 = atoi(yytext);
return val;
};
{HEX} {
yylval.u32 = parsehex(yytext);
return val;
};
\{ {
return '{';
};
\} {
return '}';
};
\[ {
return '[';
};
\] {
return ']';
};
, {
return ',';
};
: {
return ':';
};
= {
return '=';
};
[ \t\n]+ /* ignore whitespace */;
{COMMENT} /* ignore comments */
\% {
return '%';
};
<<EOF>> { return eof; };
%%
void set_input_string(char* in) {
yy_scan_string(in);
}
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