FileHandling11.c

/*
 * 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;
 
}