Function name: Ultoa
Function: Convert an unsigned long integer to string
Usage: Char * Ultoa (unsigned long value, char * string, int RADIX);
Example:
#include
#include
Int main (void)
{
Unsigned long lnumber = 3123456789L;
Char string [25];
Ultoa (Lnumber, String, 10);
Printf ("String =% S Unsigned long =% lu / n", string, lnumber;
Return 0;
}
Function name: ungetc
Function: Back a character back to the input stream
Usage: int UNGETC (Char C, File * stream);
Example:
#include
#include
Int main (void)
{
INT i = 0;
CHAR CH;
PUTS ("INPUT AN INTEGER FOLLOWED BY A CHAR:");
/ * Read Chars Until Non Digit or EOF * /
While (ch = getchar ())! = EOF && Isdigit (CH))
I = 10 * i ch - 48; / * Convert Ascii Into int value * /
/ * If Non Digit Char Was Read, Push IT Back Into Input Buffer * /
IF (ch! = EOF)
UNGETC (CH, STDIN);
Printf ("i =% D, Next Char in buffer =% C / N", I, getChar ());
Return 0;
}
Function name: ungetch
Function: Return a character to the keyboard buffer
Usage: int UNGETCH (INT C);
Example:
#include
#include
#include
Int main (void)
{
INT i = 0;
CHAR CH;
PUTS ("INPUT AN INTEGER FOLLOWED BY A CHAR:");
/ * Read Chars Until Non Digit or EOF * /
While ((ch = getche ())! = EOF && Isdigit (CH))
I = 10 * i ch - 48; / * Convert Ascii Into int value * /
/ * If Non Digit Char Was Read, Push IT Back Into Input Buffer * /
IF (ch! = EOF)
UNGETCH (CH);
Printf ("/ N / Ni =% D, Next Char in buffer =% C / N", I, getCH ());
Return 0;
}
Function Name: Unixtodos
Function: Convert the date and time into a DOS format
Usage: void unixtodos (long utime, struct date * dateptr,
Struct Time * TimePtr);
Example:
#include
#include
Char * MONTH [] = {"---", "Jan", "Feb", "Mar", "APR", "May", "Jun", "Jul", "AUG", "SEP", " Oct "," NOV "," DEC "};
#define seconds_per_day 86400l / * the number of seconds in one day * /
Struct Date DT;
Struct TimeTM;
Int main (void)
{
Unsigned long val;
/ * GET Today's Date and Time * /
Getdate (& DT);
GetTime (& TM);
Printf ("Today IS% D% S% D / N", DT.DA_DAY, MONTH [DT.DA_MON], DT.DA_YEAR);
/ * Convert Date and Time to Unix Format (Number of Seconds Since Jan 1, 1970 * /
Val = dostounix (& dt, & tm);
/ * Subtract 42 day west of seconds * /
VAL - = (Seconds_Per_Day * 42);
/ * Convert Back to dos Time and Date * /
UNIXTODOS (VAL, & DT, & TM);
Printf ("42 days ago it is% D% S% D / N",
DT.DA_DAY, MONTH [DT.DA_MON], DT.DA_YEAR);
Return 0;
}
Function name: unlink
Function: Delete a file
Usage: int UNLINK (Char * filename);
Example:
#include
#include
Int main (void)
{
File * fp = fopen ("junk.jnk", "w");
Int status;
FPRINTF (FP, "JUNK");
Status = Access ("junk.jnk", 0);
IF (status == 0)
Printf ("File EXISTS / N");
Else
Printf ("File Doesn't Exist / N");
Fclose (fp);
Unlink ("junk.jnk");
Status = Access ("junk.jnk", 0);
IF (status == 0)
Printf ("File EXISTS / N");
Else
Printf ("File Doesn't Exist / N");
Return 0;
}
Function Name: Unlock
Function: Release file sharing lock
Usage: int UNLOCK (Int Handle, Long Offset, Long Length);
Example:
#include
#include
#include
#include
#include
#include
INT main (void) {
INT HANDLE, STATUS;
Long Length;
Handle = Sopen ("c: //autoexec.bat", o_rdonly, sh_denyno, s_iread);
IF (Handle <0)
{
Printf ("Sopen Failed / N");
Exit (1);
}
Length = fileLength;
STATUS = LOCK (Handle, 0L, Length / 2);
IF (status == 0)
Printf ("Lock Succeeded / N");
Else
Printf ("Lock FaileD / N");
Status = UNLOCK (Handle, 0L, Length / 2);
IF (status == 0)
Printf ("Unlock successmeded / n");
Else
Printf ("Unlock Failed / N");
Close (Handle);
Return 0;
}
