Thread: Need an example of Functions/parameter passing/and arrays. can anyone help?

I feel truly benevolent tonight, here's full source code of one of my toy programs for you to examine.

Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define LINECOUNT 15

static void manPrint ( char *buf );
static void addPage ( char *buf );
static void listPages ( void );
static void helpPage ( void );
static void collectGarbage ( FILE *file );

int main ( void )
{
  char buffer[BUFSIZ];
  printf ( "WindowsXP Man Pages\n\n$: " );
  while ( fgets ( buffer, (int)sizeof buffer, stdin ) != NULL ) {
    /* Clear the trailing newline and test the input */
    buffer[strlen(buffer)-1] = '\0';
    if ( buffer[0] == 'm' || buffer[0] == 'M' )
      manPrint ( buffer );
    else if ( buffer[0] == 'a' || buffer[0] == 'A' )
      addPage ( buffer );
    else if ( buffer[0] == 'l' || buffer[0] == 'L' )
      listPages();
    else if ( buffer[0] == 'h' || buffer[0] == 'H' )
      helpPage();
    else if ( buffer[0] == 'e' || buffer[0] == 'E' )
      return EXIT_SUCCESS;
    else
      printf ( "Invalid input\n" );
    printf ( "\n$: " );
  }
  return EXIT_SUCCESS;
}

void manPrint ( char *buf )
{
  FILE *man, 
       *page;
  int count = 0;
  char lineBuf[BUFSIZ],
       *temp;
  if ( ( man = fopen ( "man.txt", "r" ) ) != NULL ) {
    /* Eat the first user argument and get the next one */
    temp = strtok ( buf, " " );
    temp = strtok ( NULL, " " );
    if ( temp != NULL ) {
      /* Search for the item name in man. If found
      ** read the file path for that item and use it
      ** as the argument for opening page.
      */
      while ( fscanf ( man, "%s", lineBuf ) == 1 ) {
        if ( strcmp ( temp, lineBuf ) == 0 ) {
          (void)fscanf ( man, "%s", lineBuf );
          if ( ( page = fopen ( lineBuf, "r" ) ) != NULL ) {
            while ( fgets ( lineBuf, (int)sizeof lineBuf, page ) != NULL ) {
              printf ( "%s", lineBuf );
              count++;
              if ( count == LINECOUNT ) {
                /* Wait for user input after
                ** a certain amount of lines.
                ** Added for smaller resolution screens 
                ** that can't hold a full page.
                */
                (void)getchar();
                count = 0;
              }
            }
            collectGarbage ( page );
          }
          else {
            /* Handle open failure for page */
            fprintf ( stderr, "ERROR %d: File open failure\n", errno );
            return;
          }
        }
      }
      collectGarbage ( man );
    }
    else {
      /* Handle NULL value temp */
      fprintf ( stderr, "ERROR %d: Invalid data\n", errno );
      return;
    }
  }
  else {
    /* Handle open failure for man */
    fprintf ( stderr, "ERROR %d: File open failure\n", errno );
    return;
  }
}

void addPage ( char *buf )
{
  FILE *man;
  char *temp;
  if ( ( man = fopen ( "man.txt", "a" ) ) != NULL ) {
    fprintf ( man, "\n" );
    /* Eat the first argument and get the next one */
    temp = strtok ( buf, " " );
    while ( ( temp = strtok ( NULL, " " ) ) != NULL )
      /* Potential error, input is not checked for validity */
      (void)fprintf ( man, "%s ", temp );
      collectGarbage ( man );
    }
    else
      fprintf ( stderr, "ERROR %d: File open failure\n", errno );
}

void listPages ( void )
{
  FILE *man;
  char tmpBuf[BUFSIZ];
  if ( ( man = fopen ( "man.txt", "r" ) ) != NULL ) {
    printf ( "Supported Page List\nType man <page> to view\n-----------------------\n" );
    while ( fscanf ( man, "%s", tmpBuf ) == 1 ) {
      printf ( "%s ", tmpBuf );
      fscanf ( man, "%s", tmpBuf );
    }
    printf ( "\n" );
    collectGarbage ( man );
  }
  else
    fprintf ( stderr, "ERROR %d: File open failure\n", errno );		
}

void helpPage ( void )
{
  FILE *help;
  char buf[BUFSIZ];
  if ( ( help = fopen ( "help.txt", "r" ) ) != NULL ) {
    while ( fgets ( buf, (int)sizeof buf, help ) != NULL )
      printf ( "%s", buf );
		printf ( "\n" );
    collectGarbage ( help );
  }
  else
    fprintf ( stderr, "ERROR %d: File open failure\n", errno );
}

void collectGarbage ( FILE *file )
{
  if ( fclose ( file ) != 0 ) 
    fprintf ( stderr, "ERROR %d: File close failure\n", errno );
}

-Prelude

Just curious, why are your functions prototyped as 'static'? Additionally, your actual functions are not as prototyped, because you lack the keyword 'static' when you define them.

Quzah.