122 lines
1.7 KiB
Plaintext
122 lines
1.7 KiB
Plaintext
/* bincfg - Compiler/Decompiler for data blobs with specs */
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/* SPDX-License-Identifier: GPL-3.0-or-later */
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%{
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bincfg.tab.h"
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extern struct blob binary;
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unsigned int parsehex (char *s)
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{
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unsigned int i, nib, val = 0;
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unsigned int nibs = strlen(s) - 2;
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for (i = 2; i < nibs + 2; i++) {
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if (s[i] >= '0' && s[i] <= '9') {
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nib = s[i] - '0';
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} else if (s[i] >= 'a' && s[i] <= 'f') {
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nib = s[i] - 'a' + 10;
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} else if (s[i] >= 'A' && s[i] <= 'F') {
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nib = s[i] - 'A' + 10;
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} else {
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return 0;
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}
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val |= nib << (((nibs - 1) - (i - 2)) * 4);
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}
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return val;
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}
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char* stripquotes (char *string)
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{
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char *stripped;
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unsigned int len = strlen(string);
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if (len >= 2 && string[0] == '"' && string[len - 1] == '"') {
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stripped = (char *) malloc (len - 1);
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if (stripped == NULL) {
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printf("Out of memory\n");
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exit(1);
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}
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snprintf (stripped, len - 1, "%s", string + 1);
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return stripped;
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}
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return NULL;
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}
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%}
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%option noyywrap
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%option nounput
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DIGIT [0-9]
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INT [-]?{DIGIT}|[-]?[1-9]{DIGIT}+
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FRAC [.]{DIGIT}+
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EXP [eE][+-]?{DIGIT}+
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NUMBER {INT}|{INT}{FRAC}|{INT}{EXP}|{INT}{FRAC}{EXP}
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HEX [0][x][0-9a-fA-F]+
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STRING ["][^"]*["]
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COMMENT [#][^\n]*$
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%%
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{STRING} {
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yylval.str = stripquotes(yytext);
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return name;
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};
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{NUMBER} {
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yylval.u32 = atoi(yytext);
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return val;
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};
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{HEX} {
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yylval.u32 = parsehex(yytext);
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return val;
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};
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\{ {
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return '{';
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};
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\} {
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return '}';
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};
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\[ {
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return '[';
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};
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\] {
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return ']';
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};
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, {
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return ',';
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};
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: {
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return ':';
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};
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= {
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return '=';
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};
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[ \t\n]+ /* ignore whitespace */;
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{COMMENT} /* ignore comments */
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\% {
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return '%';
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};
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<<EOF>> { return eof; };
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%%
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void set_input_string(char* in) {
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yy_scan_string(in);
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}
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