C program to Find the Function Name of a C File

This C Program displays the function names defined in c source file.

Here is source code of the C Program to display the function names defined in c source file. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * 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;
```
```
 
```
```
}
```

$ cc file9.c
$ a.out 
 
File Opened to display function names :
main
check
display

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