/*
 * C program to Display the Function Names defined in C Source File
 */
#include <stdio.h>
#include <string.h>

void check(char *c,int p1, int p2);
void display(char *c, int p1);

void main(int argc, char **argv)
{
    FILE *fp;
    char ch[100];
    char *pos1, *pos2, *pos3;
    fp=fopen(argv[1], "r");
    if (fp == NULL)
        {
            printf("\nFile unable to open");
            return;
        }
    else
        printf("\nFile Opened to display function names :\n");
    while (1)
        {
            if ((fgets(ch, 100, fp)) != NULL)
                {
                    if ((strstr(ch, "/*")) == NULL)
                        {
                            pos1 = strchr(ch, '(');                /* check opening brace */
                            if (pos1)
                                {
                                    pos2 = strchr(ch,')');            /* check oclosing brace */
                                    if (pos2)
                                        {
                                            pos3 = strchr(ch,';');        /* check for semicolon */
                                            if ((pos1 < pos2) && (pos3 == NULL) || (pos3 < pos1))
                                                {
                                                    check(ch, pos1 - ch, pos2 - ch);
                                                }
                                            else    continue;
                                        }
                                    else    continue;
                                }
                            else    continue;
                        }
                    else    continue;
                }
            else    break;
        }
    fclose(fp);
}

/* To check if it is a function */
void check(char *c, int p1, int p2)
{
    int i, flag = 0, temp = p1;
    if ((c[p1 + 1] == ')'))
        {
            display(c, p1);
            return;
        }
    for (i = p1 + 1; i < p2; i++)
        {
            if ((c[i] != ' ') || (c[i] == ')'))
                {
                    flag = 1;
                }
            if (flag == 0)
                {
                    display(c, p1);
                    return;
                }
            else
                {
                    flag = 0;
                    while (c[--temp] != ' ');
                    for (i = 0; i < temp; i++)
                        if (c[i]==' ')
                            {
                                flag = 1;
                            }
                    if (flag == 0)
                        {
                            display(c, p1);
                            return;
                        }
                    else
                        return;
                }
        }
}

/* To display function name */
void display(char *c,int p1)
{
    int temp = p1, i;
    while (c[--temp] != ' ');
    for (i = temp + 1; i < p1; i++)            /* Print name of function character by character */
        printf("%c", c[i]);
    printf("\n");
    return;
}