Lexical Analyser using C - c

Question

I have done the program as reading a string and then converted to a file input. For a single line, it is getting output. I also want to display character,integer and floating point constants and symbols in the output.
For a multiline or for a c program as input, the arrays which are printed in the last just mix up each other and some another input is generated. Anyone have idea how this happen?
#include<stdio.h>
#include<ctype.h>
#include<string.h>
#include<stdlib.h>
#define KEYWORDS 32
#define OPERATORS 25
#define DEBUG_MODE 1
typedef enum {FALSE,TRUE} boolean;
char *trimString(char *str)
{
char *end;
// Trim leading space
while(isspace((unsigned char)*str)) str++;
if(*str == 0) // All spaces?
return str;
// Trim trailing space
end = str + strlen(str) - 1;
while(end > str && isspace((unsigned char)*end)) end--;
// Write new null terminator
*(end+1) = 0;
return str;
}
int main()
{
char delimit[]=" \t\r\n\v\f(){};""";
char str[80],filename[40],*token,*keyword[30],*identifier[30],*operator[30],*literal[30],tmp[80];
int state=0,i=0,j=0,k=0,l=0,m=0,c,ch=0,isKeyword=0,isOperator=0;
boolean isComment=FALSE;
char* key[] = {"auto","break", "case", "char", "const", "continue", "default", "do", "double", "else", "enum", "extern", "float", "for", "goto", "if", "int", "long","register", "return", "short","signed", "sizeof", "static","struct", "switch","typedef","union", "unsigned", "void","volatile", "while"};
char* operators[] = {"+", "-", "/", "*", "%", "=", "+=", "++", "--", "-=", "*=", "/=", "%=", "==", ">", "<", "!=", ">=", "<=", "&&", "||", "!", "<<", ">>", "sizeof"};
printf("Enter the filename: ");
gets(filename);
FILE* file = fopen(filename, "r");
if(file==NULL)
{
printf("\nError opening file with filename : \'%s\'!!\n\n",filename);
exit(0);
}
while (fgets(str, sizeof(str), file))
{
//Skip=FALSE;
str[sizeof(str)-1]='\0';
if((str[0]=='#') || (str[0]=='\n')) //remove preprocessor directives and blank lines
goto gotoNextLine;
if(str[0]=='/')
{
if(str[1]=='/')
goto gotoNextLine;
else if(str[1]=='*')
{
isComment=TRUE;
goto gotoNextLine;
}
}
if(DEBUG_MODE)
printf("\n\n**isComment=%d**\n\n",isComment);
if(isComment) // skip block comments
{
c=0;
while(str[c]!='\0')
{
if(str[c]=='*')
{
if(str[c+1]=='/')
{
isComment=FALSE;
for (i=c+2; str[i]!='\0'; i++)
tmp[ch++] = str[i];
strcpy(str,tmp);
break;
}
}
if(DEBUG_MODE)
printf("\n\n**The comment loop**\n\n");
c++;
}
}
if(!isComment)
{
for (token = strtok(str, delimit); token != NULL; token = strtok(NULL, delimit))
{
isKeyword=0;
isOperator=0;
if(DEBUG_MODE)
printf("\n\n**token=%s**\n\n",token);
for (i=0;i<OPERATORS;i++)
{
if(!strcmp(trimString(token),operators[i]))
{
isOperator=1;
operator[l++]=token;
break;//goto nextToken;
}
}
if(DEBUG_MODE)
printf("\n\n**isOperator=%d**\n\n",isOperator);
if(!isOperator)
{
for (i=0;i<KEYWORDS;i++)
{
if(!strcasecmp(trimString(token),key[i]))
{
isKeyword=1;
keyword[j++]=token;
break;//goto nextToken;
}
}
}
if(DEBUG_MODE)
printf("\n\n**isKeyword=%d**\n\n",isKeyword);
if(!isKeyword && !isOperator)
{
i=ch=state=0;
if(token[0]=='"')
{
for (i=1; str[i]!='"'; i++)
tmp[ch++] = token[i];
strcpy(token,tmp);
literal[m++]=token;
goto nextToken;
}
while(token[i]!='\0')
{
if((token[0]=='#') || (token[0]=='\n'))
goto nextToken;
switch(state)
{
case 0: if(isalpha(token[i]) || token[i]=='_')
{
state=1;
i++;
}
else
state=2;
break;
case 1: if(isalnum(token[i]) || token[i]=='_')
{
state=1;
i++;
}
else
state=2;
break;
case 2: goto nextToken;
}
}
if(state==1)
{
identifier[k++]=token;
if(DEBUG_MODE)
printf("\n\n**Identifier_True=%s**\n\n",token);
}
}
nextToken: ;
}
}
gotoNextLine: ;
}
if(DEBUG_MODE)
printf("\n\n**Keywords_Count=%d**\n\n",j);
if(j)
{
printf("\nKeywords: \n");
for(i=0;i<j;i++)
{
printf("%s",keyword[i]);
if((i+1)<j)
printf(", ");
}
printf("\n");
}
if(DEBUG_MODE)
printf("\n\n**Operators_Count=%d**\n\n",l);
if(l)
{
printf("\nOperators: \n");
for(i=0;i<l;i++)
{
printf("%s",operator[i]);
if((i+1)<l)
printf(", ");
}
printf("\n");
}
if(DEBUG_MODE)
printf("\n\n**Identifiers_Count=%d**\n\n",k);
if(k)
{
printf("\nIdentifiers: \n");
for(i=0;i<k;i++)
{
printf("%s",identifier[i]);
if((i+1)<k)
printf(", ");
}
}
printf("\n");
fclose(file);
}