print_it2.c

来自「c21Examples.rar」· C语言 代码 · 共 54 行

/* print_it.c--This program prints a listing with line numbers! */
#include <stdlib.h>
#include <stdio.h>

void do_heading(char *filename);

int line, page;

int main( int argv, char *argc[] )
{
  char buffer[256];
  FILE *fp;

  if( argv < 2 )
  {
     fprintf(stderr, "\nProper Usage is: " );
     fprintf(stderr, "\n\nPRINT_IT filename.ext\n" );
     return(1);
  }

  if (( fp = fopen( argc[1], "r" )) == NULL )
  {
       fprintf( stderr, "Error opening file, %s!", argc[1]);
       return(1);
  }

  page = 0;
  line = 1;
  do_heading( argc[1]);

  while( fgets( buffer, 256, fp ) != NULL )
  {
     if( line % 55 == 0 )
        do_heading( argc[1] );

     fprintf( stdout, "%4d:\t%s", line++, buffer );
  }

  fprintf( stdout, "\f" );
  fclose(fp);
  return 0;
}

void do_heading( char *filename )
{
   page++;

   if ( page > 1)
      fprintf( stdout, "\f" );

   fprintf( stdout, "Page: %d, %s\n\n", page, filename );
}