// Ivan Novick
// Feb-28, 2011
// demonstrate typical config file parsing
// where you remove # comments and 
// trim leading and trailing white space


#include <stdio.h>
#include <string.h>

char* normalize(char* line);

int main(int argc,  char** argv)
{
    char buffer[1024] = { 0 };
    char* comment = NULL;
    FILE* fp = stdin;

    while (NULL != fgets(buffer, 1024, fp))
    {
        buffer[strlen(buffer)-1] = 0;

        // print the line after removing comments and
        // trimming white space
        printf("%s.\n", normalize(buffer));
    }

    fclose(fp);

    return 0;
}

// remove comments with #
// remove trailing and leading spaces
char* normalize(char* line)
{
    int i;
    int len = 0;
    char* comment;

    // remove comments with #
    comment = strstr(line, "#");
    if (comment)
    {
        // everything in the string from comment char unward is ignored
        *comment = 0;
    }

    // remove trailing spaces
    len = strlen(line);
    for (i = len-1; i >= 0; --i)
    {
        if (isspace(line[i]))
            line[i] = 0;
        else
            break;
    }

    while (*line)
    {
        if (isspace(*line))
            line++;
        else
            break;
    }

    return line;
}