[gyanu]

I want to create a new function myscanf (char *format,...) which does same as scanf() without using any library function other than getchar().
Pls soomeone get it done for meeeeee.plssssssssssss

[shabbir]

char c;
do 
{
    c=getchar();
    putchar (c);
} while (c != '\n');

[asadullah.ansari]

Quote:

Originally Posted by shabbir

char c;
do 
{
    c=getchar();
    putchar (c);
} while (c != '\n');

You are still using library function getchar() and putchar().

He is asking if i am correct.

#include "stddef.h"
#include "stdarg.h"
#include "stdlib.h"

extern FILE *Stderr;


int  MyScanf(char *s, const char *fmt, ...)
{
	char *s0;
	va_list ap;
	long L, *Lp;
	int i, *ip, rc = 0;
	va_start(ap, fmt);
	for( ; ; ) {
		for(;;) {
			switch(i = *(unsigned char *)fmt++) {
				case 0:
					goto done;
				case '%':
					break;
				default:
					if (i <= ' ') {
						while(*s <= ' ')
							if (!*s++)
								return rc;
						}
					else if (*s++ != i)
						return rc;
					continue;
				}
			break;
			}
		switch(*fmt++) {
			case 'l':
				if (*fmt != 'd')
					bad(fmt);
				fmt++;
				Lp = va_arg(ap, long*);
				L = strtol(s0 = s, &s, 10);
				if (s > s0) {
					rc++;
					*Lp = L;
					continue;
					}
				return rc;
			case 'd':
				ip = va_arg(ap, int*);
				L = strtol(s0 = s, &s, 10);
				if (s > s0) {
					rc++;
					*ip = (int)L;
					continue;
					}
				return rc;
			default:
				bad(fmt);
			}
		}
 done:
	return rc;
	}
	}

[asadullah.ansari]

Oh!! At the last of code add one function

va_end ( ap );

[gyanu]

Quote:

Originally Posted by gyanu

I want to create a new function myscanf (char *format,...) which does same as scanf() without using any library function other than getchar().
Pls soomeone get it done for meeeeee.plssssssssssss

Shabbir bhai, hi
U have helped me really.......... But my problem is not about supporting integer but rather %s,for string datatype char buf[100]
%x, for hexadecimal
%c for characters
please help me little bit more

[gyanu]

Quote:

Originally Posted by asadullah.ansari

You are still using library function getchar() and putchar().

He is asking if i am correct.

#include "stddef.h"
#include "stdarg.h"
#include "stdlib.h"

extern FILE *Stderr;


int  MyScanf(char *s, const char *fmt, ...)
{
	char *s0;
	va_list ap;
	long L, *Lp;
	int i, *ip, rc = 0;
	va_start(ap, fmt);
	for( ; ; ) {
		for(;;) {
			switch(i = *(unsigned char *)fmt++) {
				case 0:
					goto done;
				case '%':
					break;
				default:
					if (i <= ' ') {
						while(*s <= ' ')
							if (!*s++)
								return rc;
						}
					else if (*s++ != i)
						return rc;
					continue;
				}
			break;
			}
		switch(*fmt++) {
			case 'l':
				if (*fmt != 'd')
					bad(fmt);
				fmt++;
				Lp = va_arg(ap, long*);
				L = strtol(s0 = s, &s, 10);
				if (s > s0) {
					rc++;
					*Lp = L;
					continue;
					}
				return rc;
			case 'd':
				ip = va_arg(ap, int*);
				L = strtol(s0 = s, &s, 10);
				if (s > s0) {
					rc++;
					*ip = (int)L;
					continue;
					}
				return rc;
			default:
				bad(fmt);
			}
		}
 done:
	return rc;
	}
	}

ansari bhai
Thanks a lot .U r great but my problems are little more tough.I should not use myscanf(char *s,char *fmt,...)
Also it should support %c,%x and %s for strings too

[shabbir]

Quote:

Originally Posted by gyanu

Shabbir bhai, hi
U have helped me really.......... But my problem is not about supporting integer but rather %s,for string datatype char buf[100]
%x, for hexadecimal
%c for characters
please help me little bit more

I could not get you.

[oogabooga]

Quote:

Originally Posted by gyanu

but my problems are little more tough.I should not use myscanf(char *s,char *fmt,...) Also it should support %c,%x and %s for strings too

Could we please see some of your code?
I've seen this on another forum, and I've yet to see any code from you.
People are not just going to do it for you (hopefully).
If you want to cheat, look up some open source code for scanf.

[gyanu]

Quote:

Originally Posted by shabbir

I could not get you.

I have to create and implement a function myscanf(char *format,...) wilthout using any library functions other than getchar().
My program would support to undersand---------myscanf("%d%s%x",a,b[],c);

[shabbir]

The string parsing and variable number of arguments in a function is all together a diiferent topic and you can check out - OutputDebugString with variable number of arguments for that but I guess your initial requirement is fully satisfied with the code snippet I provided.