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lftc3.c
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lftc3.c
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#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
enum{ID, END, CT_INT, ASSIGN, SEMICOLON, BREAK, CHAR, DOUBLE, ELSE, FOR, IF, INT, RETURN, STRUCT, VOID, WHILE};
typedef struct TokenO{
int code;
union{
char *text;
long int i;
double r;
};
int line;
struct TokenO *next;
}Token;
void err(const char *fmt, ...){
va_list va;
va_start(va, fmt);
fprintf(stderr, "error: ");
vfprintf(stderr, fmt, va);
fputc('\n', stderr);
va_end(va);
exit(-1);
}
void safeAlloc(Token *tk){
if(!(tk = (Token*)malloc(sizeof(Token)))){
err("not enough memory");
}
}
Token *tokens;
Token *lastToken;
char* keywordStringList[11] = {
"break", "char", "double", "else"
"for", "if", "int", "return",
"struct", "void", "while"
};
int enumList[11] = {
BREAK, CHAR, DOUBLE, ELSE,
FOR, IF, INT, RETURN,
STRUCT, VOID, WHILE
};
int line = 0;
Token *addTk(int code){
Token *tk;
safeAlloc(tk);
tk->code = code;
tk->line = line;
tk->next = NULL;
if(lastToken){
lastToken->next = tk;
}else{
tokens = tk;
}
lastToken = tk;
return tk;
}
void tkerr(const Token *tk, const char *fmt, ...){
va_list va;
va_start(va, fmt);
fprintf(stderr, "error on line %d: ", tk->line);
vfprintf(stderr, fmt, va);
fputc('\n', stderr);
va_end(va);
exit(-1);
}
int getNextToken(){
int state = 0;
int nCh;
char ch;
const char *pStartCh;
Token *tk;
char *pCrtCh;
while(1){
ch = *pCrtCh;
switch(state){
case 0:
if(isalpha(ch) || ch == '_'){
pStartCh = pCrtCh;
pCrtCh++;
state = 1;
}else if(ch == '='){
pCrtCh++;
state = 39;
}
else if(ch == ' ' || ch == '\r' || ch == '\t'){
pCrtCh++;
}
else if(ch == '\n'){
line++;
pCrtCh++;
}
else if(ch == 0){
addTk(END);
return END;
}
else
tkerr(addTk(END), "caracter invalid");
break;
case 1:
if(isalnum(ch) || ch == '_'){
pStartCh++;
}
else
state = 2;
break;
case 2:
nCh = pStartCh - pCrtCh;
//checking for keywords
for(int i = 0; i < 11; i++){
if(nCh == strlen(keywordStringList[i]) && !memcmp(pStartCh, keywordStringList[i], strlen(keywordStringList[i])))
tk = addTk(enumList[i]);
}
/*if(nCh == 5 && !memcmp(pStartCh, "break", 5))
tk = addTk(BREAK);
else if(nCh == 4 && !memcmp(pStartCh, "char", 4))
tk = addTk(CHAR);
else if(nCh == 6 && !memcmp(pStartCh, "double", 6))
tk = addTk(DOUBLE);
else if(nCh == 4 && !memcmp(pStartCh, "else", 4))
tk = addTk(ELSE);
else if(nCh == 3 && !memcmp(pStartCh, "for", 3))
tk = addTk(FOR);
else if(nCh == 2 && !memcmp(pStartCh, "if", 2))
tk = addTk(IF);
else if(nCh == 3 && !memcmp(pStartCh, "int", 3))
tk = addTk(INT);
else if(nCh == 6 && !memcmp(pStartCh, "return", 6))
tk = addTk(RETURN);
else if(nCh == 6 && !memcmp(pStartCh, "struct", 6))
tk = addTk(STRUCT);//and so on
* */
}
}
}
char inbuf[30001];
int main(int argc, char **argv){
safeAlloc(tokens);
safeAlloc(lastToken);
char *pCh;
FILE *f = fopen(argv[1], "r");
int n = fread(inbuf, 1, 30000, f);
inbuf[n] = '\0';
pCh = inbuf;
while(getNextToken() != END){
}
//printTokens(); TODO
}