C> string operation> Implementation to put in char [] with specified digit

I want to put a number in char [] with the specified number of digits. When the number of digits is small, put a space (0x20) in front. Consider the environment where sprintf () cannot be used.

try1 (positive numbers only)

#include <stdio.h>

void SetValToCharArray(int val, int length, char *dstPtr)
{
	int loop;
	int digit;
	int work;

	work = val;
	digit = 0;
	while(work > 0) {
		work /= 10;
		digit++;
	}
	
	for(loop=0; loop < (length-digit); loop++) {
		*dstPtr = ' ';
		dstPtr++;
	}

	dstPtr += (digit - 1);
	work = val;
	for(loop=0; loop< digit; loop++) {
		*dstPtr = (work % 10) + '0';
		work /= 10;
		dstPtr--;
	}
}

int main(void) {
	int val = 32768;
	char szBuf[10];
	
	memset(szBuf, 0, sizeof(szBuf) );

	SetValToCharArray(val, /*length=*/7, &szBuf[0]);
	printf("[%s]\n", szBuf); // [  32768]
	
	// for check
	sprintf(szBuf, "%7d", val);
	printf("[%s]\n", szBuf);
	return 0;
}

http://ideone.com/5b6usH

try2 (for negative numbers)

It's not very clean coding, but it worked for the time being.

#include <stdio.h>
#include <stdbool.h>

void SetValToCharArray(int val, int length, char *dstPtr)
{
	int loop;
	int digit;
	int work;
	
	bool minus = false;

	if (val < 0) {
		minus = true;
		val = (-val);
		length--;
	}

	work = val;
	digit = 0;
	while(work > 0) {
		work /= 10;
		digit++;
	}
	
	for(loop=0; loop < (length-digit); loop++) {
		*dstPtr = ' ';
		dstPtr++;
	}
	
	if (minus) {
	   	*dstPtr = '-';
	   	dstPtr++;
	}

	dstPtr += (digit - 1);
	work = val;
	for(loop=0; loop < digit; loop++) {
		*dstPtr = (work % 10) + '0';
		work /= 10;
		dstPtr--;
	}
}

int main(void) {
	int val = -271;
	char szBuf[10];
	
	memset(szBuf, 0, sizeof(szBuf) );

	SetValToCharArray(val, /*length=*/7, &szBuf[0]);
	printf("[%s]\n", szBuf); // [  32768]
	
	// for check
	sprintf(szBuf, "%7d", val);
	printf("[%s]\n", szBuf);
	return 0;
}

http://ideone.com/W7BqSz

Remarks

When the value is 0, it becomes as follows. I'm considering what I want to do.

[    ]

Implementation for the time being http://ideone.com/sIGRt4