Lex: concatenating word into array of c-strings

Shell Programming and Scripting
1

Alright, so I'm writing a file for the lexical analyzer (lex). It will be used to check C code (collecting the identifiers and storing those names along with the line numbers the identifier was found on). I'm not used to 'C' so I'm having some difficulty.

I am using a function (insertId()) to actually add to the c-string array.

%{
#include <stdio.h>
#include <string.h>
    const char* id[1000];
    void insertId(char*, int);
    int i = 0;
    int newLineCnt = 1;
%}

%%
[a-zA-Z][a-zA-Z0-9_]+  {
                            id = yytext;
                           // printf("The word found was: %s and 'i' is: %d\n", id, i);
                            
                            insertId(yytext, newLineCnt);
                       }
"\n"                   newLineCnt++; 
[a-z]              printf("Lowercase word\n");
[A-Z]              printf("Uppercase word\n");
[0-9]              printf("Integer\n");
";"                printf("Semicolon");
"("                printf("Open parentheses\n");
")"                printf("Close parentheses");
%%
void insertId(char* str, int nLine)
{
    char num[2];
    sprintf ( num, "%d", nLine);
    static char string[100];
    
    int iter;
    for(iter = 0; iter < i+1; iter++)
    {
        if ( strcmp(str, id[iter]) == 0 )
        {
            strcat( string, ", " );
            strcat( string, num );
            strcat ( id[iter], string );
            //printf("The word found was: %s\n", id[iter]);
            return;
        }
    }



    i++;
    
   // printf("That string was: %s\n", str);
    strcpy ( string, str);
    strcat ( string, ": ");
    sprintf ( num, "%d", nLine);         
    strcat (string, num);
   
  //  sprintf ( num, "%d", nLine);
  //  strcat (string, num);
    id = string;

    //printf("The word found was:   %s on line %d\n", id[i-1], nLine);
}

Sample input:

Output should look like this below:

argc: 4, 5, 11, 13, 16, 18
argv: 4, 6, 11, 14, 17
 exit: 23
fputs: 17
       i: 8, 16, 17, 18
main: 4
  nflg: 8, 10, 12, 21
putchar: 19, 22
 sccsid: 1
 stdout: 17
2

[redacted]

3

Thanks for the reply! I don't clearly understand the code you've provided me. In fact I'm a bit confused :confused:. Is there any other way to append the line numbers other than what I think I'm seeing (dynamic allocation)?

---------- Post updated at 11:47 AM ---------- Previous update was at 11:05 AM ----------

Does the code you've provided store a linked list of line numbers (integers)? I'm trying to print out one inputted word and the line number found and it's giving me '0' for the line number. Line number is originally set to '1' in the program.

    printf("%s and line numbers are:%d\n", id[0].token, id[0].list[id[0].len]);
4

[redacted]

5

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