forked from KolibriOS/kolibrios
98 lines
2.2 KiB
C
98 lines
2.2 KiB
C
/*
|
|
function for format output to the string. much lighter than standard sprintf
|
|
because of lesser formats supported
|
|
*/
|
|
|
|
|
|
#include <string.h>
|
|
//#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <stdarg.h>
|
|
|
|
char* __itoa(int n,char* s);
|
|
char* itoab(unsigned int n, char* s, int b);
|
|
|
|
int tiny_vsnprintf (char * s, size_t n, const char * format, va_list args )
|
|
// support %c, %s, %d, %x, %u, %% for 32-bit values only. no width specs, left align
|
|
// always zero-ended
|
|
{
|
|
char *fmt, *dest, buf[32];
|
|
fmt = (char*)format;
|
|
dest = s; dest[n - 1] = '\0';
|
|
int arg, len;
|
|
while (*fmt && (dest - s < n - 1))
|
|
{
|
|
if (*fmt != '%')
|
|
{
|
|
*dest++ = *fmt++;
|
|
continue;
|
|
}
|
|
if (fmt[1] == '%') // %%
|
|
{
|
|
*dest++ = '%';
|
|
fmt += 2;
|
|
continue;
|
|
}
|
|
arg = va_arg(args, int);
|
|
len = n - 1 - (dest - s);
|
|
switch (*++fmt)
|
|
{
|
|
case 'c':
|
|
*dest++ = (char)arg;
|
|
break;
|
|
case 's':
|
|
strncpy(dest, (char*)arg, len);
|
|
dest = strchr(dest, 0);
|
|
break;
|
|
case 'd':
|
|
__itoa(arg, buf);
|
|
strncpy(dest, buf, len);
|
|
dest = strchr(dest, 0);
|
|
break;
|
|
case 'x':
|
|
itoab((unsigned)arg, buf, 16);
|
|
strncpy(dest, buf, len);
|
|
dest = strchr(dest, 0);
|
|
break;
|
|
case 'u':
|
|
itoab((unsigned)arg, buf, 10);
|
|
strncpy(dest, buf, len);
|
|
dest = strchr(dest, 0);
|
|
break;
|
|
default:
|
|
*dest++ = *fmt;
|
|
}
|
|
fmt++;
|
|
}
|
|
*dest = '\0';
|
|
return dest - s;
|
|
}
|
|
|
|
|
|
int tiny_snprintf (char * s, size_t n, const char * format, ... )
|
|
{
|
|
va_list arg;
|
|
int rc;
|
|
va_start(arg, format);
|
|
|
|
rc = tiny_vsnprintf(s, n, format, arg);
|
|
|
|
va_end(arg);
|
|
return rc;
|
|
}
|
|
|
|
int tiny_sprintf (char * s, const char * format, ... )
|
|
{
|
|
va_list arg;
|
|
int rc;
|
|
va_start(arg, format);
|
|
|
|
rc = tiny_vsnprintf(s, 4096, format, arg);
|
|
|
|
va_end(arg);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|