pintos-doxygen/html/lineup_8c_source.html

/** lineup.c


   Converts a file to uppercase in-place.


   Incidentally, another way to do this while avoiding the seeks

   would be to open the input file, then remove() it and reopen

   it under another handle.  Because of Unix deletion semantics

   this works fine. */


#include <ctype.h>

#include <stdio.h>

#include <syscall.h>


int

main (int argc, char *argv[])

{

  char buf[1024];

  int handle;


  if (argc != 2)

    exit (1);


  handle = open (argv[1]);

  if (handle < 0)

    exit (2);


  for (;;)

    {

      int n, i;


      n = read (handle, buf, sizeof buf);

      if (n <= 0)

        break;


      for (i = 0; i < n; i++)

        buf[i] = toupper ((unsigned char) buf[i]);


      seek (handle, tell (handle) - n);

      if (write (handle, buf, n) != n)

        printf ("write failed\n");

    }


  close (handle);


  return EXIT_SUCCESS;

}

buf
static char buf[BUF_SIZE]
Definition: child-syn-read.c:16

ctype.h

toupper
static int toupper(int c)
lib/ctype.h
Definition: ctype.h:26

printf
int printf(const char *format,...)
Writes formatted output to the console.
Definition: stdio.c:79

exit
void exit(int status)
Definition: syscall.c:72

close
void close(int fd)
Definition: syscall.c:139

open
int open(const char *file)
Definition: syscall.c:103

write
int write(int fd, const void *buffer, unsigned size)
Definition: syscall.c:121

seek
void seek(int fd, unsigned position)
Definition: syscall.c:127

tell
unsigned tell(int fd)
Definition: syscall.c:133

read
int read(int fd, void *buffer, unsigned size)
Definition: syscall.c:115

EXIT_SUCCESS
#define EXIT_SUCCESS
Typical return values from main() and arguments to exit().
Definition: syscall.h:19

main
int main(int argc, char *argv[])
lineup.c
Definition: lineup.c:15