Hi i'm learning to write some C code...
But I'm using book from 1999 here is the link...
C tutorial
Anyway this is a really bad tutorial cause I had to find all the mistakes and faults in the code and I corrected them...
By the way if someone got a better book than this tell me...
But now I really can't find anything that will help me on the net.
Like I said in the title when i want to compile it, it still gives me the error for conflicting types for malloc()
Can someone give me some advice what goes wrong???
just copy/paste in emacs and try to compile it you'll see he blocks at line 21...
I can't run it through gdb because i got no executable file yet...
here it is
/* low level file handling */
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <fcntl.h>
#include <string.h>
#include <malloc.h>
#define CODE 0
#define SIZE 255
#define FNMSIZE 30
#define TRUE 1
#define FALSE 0
#define FAILED -1
#define CLRSCRN() system("clear")
#define NEWLINE() putchar('\n')
int fd;
char *malloc();
main ()
{char *data,getkey();
if ((data = malloc(SIZE)) == NULL)
{
puts("Out of memory\n");
return (CODE);
}
while (TRUE)
{
menu();
switch(getkey())
{
case 'l' : LoadFile(data);
break;
case 's' : SaveFile(data);
break;
case 'e' : EditFile(data);
break;
case 'd' : DeleteFile(data);
break;
case 'r' : RenameFile(data);
break;
case 'q' : if (sure())
{
return (CODE);
}
break;
}
}
}
menu ()
{
CLRSCRN();
printf("----------------------------\n");
printf("| MENU |\n");
printf("| ---- |\n");
printf("| |\n");
printf("| L) Load File |\n");
printf("| S) Save File |\n");
printf("| E) Edit File |\n");
printf("| D) Delete File |\n");
printf("| R) Rename File |\n");
printf("| Q) Quit |\n");
printf("| |\n");
printf("| Select option and RETURN |\n");
printf("| |\n");
printf("----------------------------\n");
NEWLINE();
}
LoadFile(data)
char *data;
{char *filename(),getkey();
int error;
fd = open(filename(), O_RDONLY);
if (fd == FAILED)
{
printf("File not found\n");
return (FAILED);
}
error = read(fd,data,SIZE);
if (error == FAILED)
{
printf("Error loading file\n");
return (FAILED);
}
else
{
if (error != SIZE);
{
printf("File is corrupted\n");
wait();
}
}
close(fd,data,SIZE);
return (error);
}
SaveFile (data)
char *data;
{char *filename(),getkey(),*fname;
int fd,error;
fd = open((fname = filename()), O_WRONLY);
if (fd == FAILED)
{
printf("File can not be written to\n");
printf("Create a new File? Y/N ");
if (yes())
{
if ((fd = CreateFile(fname)) == FAILED )
{
printf("Can not create file %s\n",fname);
return (FAILED);
}
}
else
{
return (FAILED);
}
}
error = write(fd,data,SIZE);
if (error < SIZE)
{
printf("Error writing to file\n");
if (error != FAILED)
{
printf("File only partially written\n");
}
}
close(fd,data,SIZE);
wait();
return (error);
}
EditFile (data)
char *data;
{char *ptr;
int ctr = 0;
printf("Contents of file :\n\n");
for (ptr = data; ptr < (data + SIZE); ptr++)
{
if (isprint(*ptr))
{
putchar(*ptr);
if ((ctr++ % 60) == 0)
{
NEWLINE();
}
}
}
printf("\n\nEnter %1d characters: \n",SIZE);
for (ptr = data; ptr < (data +SIZE); ptr++)
{
*ptr = getchar();
}
skipgarb();
}
DeleteFile ()
{ char *filename(),getkey(),*fname;
printf("Delete File\n\n");
fname = filename();
if (sure())
{
if (remove(fname) == FAILED)
{
printf("Can't delete %s\n",fname);
}
}
else
{
printf("File NOT deleted!\n");
}
wait();
}
RenameFile()
{char old[FNMSIZE],*new;
printf("Rename from Old to New\n\nOld : ");
strcopy(old,filenm());
printf("\nNew : ");
*new = filenm();
if (rename(old,new) == FAILED)
{
printf("Can't rename %s as %s \n",old,new);
}
wait();
}
CreateFile (fname)
char *fname;
{int fd;
if((fd = creat(fname,0)) == FAILED)
{
printf("Can't create %s\n",fname);
return (FAILED);
}
return (fd);
}
char *filename()
{ static char statfilenm[FNMSIZE];
do
{
printf("Enter Filename : ");
scanf("%24s",statfilenm);
skipgarb();
}
while (strlen(statfilenm) == 0);
return (statfilenm);
}
sure ()
{
printf("Are you sure? Y/N ");
return (yes());
}
yes ()
{char getkey();
while (TRUE)
{
switch(getkey())
{
case 'y' : return (TRUE);
case 'n' : return (FALSE);
}
}
}
wait ()
{char getkey();
printf("Press any key\n");
getkey();
}
char getkey()
{char ch;
ch = getchar();
skipgarb();
return ((char)tolower(ch));
}
skipgarb ()
{
while (getchar() != '\n')
{
}
}
