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/* Copyright (C) 2000 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#include <my_global.h>
#include <m_string.h>
#include <stdarg.h>
#include <m_ctype.h>
/*
Limited snprintf() implementations
exported to plugins as a service, see the detailed documentation
around my_snprintf_service_st
*/
size_t my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap)
{
char *start=to, *end=to+n-1;
size_t length, width;
uint pre_zero, have_longlong;
for (; *fmt ; fmt++)
{
if (*fmt != '%')
{
if (to == end) /* End of buffer */
break;
*to++= *fmt; /* Copy ordinary char */
continue;
}
fmt++; /* skip '%' */
/* Read max fill size (only used with %d and %u) */
if (*fmt == '-')
fmt++;
length= width= 0;
pre_zero= have_longlong= 0;
if (*fmt == '*')
{
fmt++;
length= va_arg(ap, int);
}
else
for (; my_isdigit(&my_charset_latin1, *fmt); fmt++)
{
length= length * 10 + (uint)(*fmt - '0');
if (!length)
pre_zero= 1; /* first digit was 0 */
}
if (*fmt == '.')
{
fmt++;
if (*fmt == '*')
{
fmt++;
width= va_arg(ap, int);
}
else
{
for (; my_isdigit(&my_charset_latin1, *fmt); fmt++)
width= width * 10 + (uint)(*fmt - '0');
}
}
else
width= SIZE_T_MAX;
if (*fmt == 'l')
{
fmt++;
if (*fmt != 'l')
have_longlong= (sizeof(long) == sizeof(longlong));
else
{
fmt++;
have_longlong= 1;
}
}
else if (*fmt == 'z')
{
fmt++;
have_longlong= (sizeof(size_t) == sizeof(longlong));
}
if (*fmt == 's') /* String parameter */
{
reg2 char *par= va_arg(ap, char *);
size_t plen, left_len= (size_t) (end - to) + 1;
if (!par)
par = (char*) "(null)";
plen= strnlen(par, width);
if (left_len <= plen)
plen = left_len - 1;
to= strnmov(to,par,plen);
continue;
}
else if (*fmt == 'b') /* Buffer parameter */
{
char *par = va_arg(ap, char *);
DBUG_ASSERT(to <= end);
if (to + width + 1 > end)
width= end - to - 1; /* sign doesn't matter */
memmove(to, par, width);
to+= width;
continue;
}
else if (*fmt == 'f' || *fmt == 'g')
{
double d= va_arg(ap, double);
if (width == SIZE_T_MAX)
width= FLT_DIG; /* width not set, use default */
else if (width >= NOT_FIXED_DEC)
width= NOT_FIXED_DEC - 1; /* max.precision for my_fcvt() */
width= min(width, (size_t)(end-to) - 1);
if (*fmt == 'f')
to+= my_fcvt(d, (int)width , to, NULL);
else
to+= my_gcvt(d, MY_GCVT_ARG_DOUBLE, (int) width , to, NULL);
}
else if (*fmt == 'd' || *fmt == 'u' || *fmt == 'x' || *fmt == 'X' ||
*fmt == 'p')
{
/* Integer parameter */
longlong larg;
size_t res_length, to_length;
char *store_start= to, *store_end;
char buff[32];
if (*fmt == 'p')
{
have_longlong= (sizeof(void *) == sizeof(longlong));
}
if ((to_length= (size_t) (end-to)) < 16 || length)
store_start= buff;
if (have_longlong)
larg = va_arg(ap,longlong);
else if (*fmt == 'd')
larg = va_arg(ap, int);
else
larg= va_arg(ap, uint);
if (*fmt == 'd')
store_end= longlong10_to_str(larg, store_start, -10);
else if (*fmt == 'u')
store_end= longlong10_to_str(larg, store_start, 10);
else if (*fmt == 'p')
{
store_start[0]= '0';
store_start[1]= 'x';
store_end= ll2str(larg, store_start + 2, 16, 0);
}
else
{
DBUG_ASSERT(*fmt == 'X' || *fmt =='x');
store_end= ll2str(larg, store_start, 16, (*fmt == 'X'));
}
if ((res_length= (size_t) (store_end - store_start)) > to_length)
break; /* num doesn't fit in output */
/* If %#d syntax was used, we have to pre-zero/pre-space the string */
if (store_start == buff)
{
length= min(length, to_length);
if (res_length < length)
{
size_t diff= (length- res_length);
bfill(to, diff, pre_zero ? '0' : ' ');
to+= diff;
}
bmove(to, store_start, res_length);
}
to+= res_length;
continue;
}
else if (*fmt == 'c') /* Character parameter */
{
register int larg;
if (to == end)
break;
larg = va_arg(ap, int);
*to++= (char) larg;
continue;
}
/* We come here on '%%', unknown code or too long parameter */
if (to == end)
break;
*to++='%'; /* % used as % or unknown code */
}
DBUG_ASSERT(to <= end);
*to='\0'; /* End of errmessage */
return (size_t) (to - start);
}
size_t my_snprintf(char* to, size_t n, const char* fmt, ...)
{
size_t result;
va_list args;
va_start(args,fmt);
result= my_vsnprintf(to, n, fmt, args);
va_end(args);
return result;
}
#ifdef MAIN
#define OVERRUN_SENTRY 250
static void my_printf(const char * fmt, ...)
{
char buf[33];
int n;
va_list ar;
va_start(ar, fmt);
buf[sizeof(buf)-1]=OVERRUN_SENTRY;
n = my_vsnprintf(buf, sizeof(buf)-1,fmt, ar);
printf(buf);
printf("n=%d, strlen=%d\n", n, strlen(buf));
if ((uchar) buf[sizeof(buf)-1] != OVERRUN_SENTRY)
{
fprintf(stderr, "Buffer overrun\n");
abort();
}
va_end(ar);
}
int main()
{
my_printf("Hello\n");
my_printf("Hello int, %d\n", 1);
my_printf("Hello string '%s'\n", "I am a string");
my_printf("Hello hack hack hack hack hack hack hack %d\n", 1);
my_printf("Hello %d hack %d\n", 1, 4);
my_printf("Hello %d hack hack hack hack hack %d\n", 1, 4);
my_printf("Hello '%s' hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh\n", "hack");
my_printf("Hello hhhhhhhhhhhhhh %d sssssssssssssss\n", 1);
my_printf("Hello %u\n", 1);
my_printf("Hex: %lx '%6lx'\n", 32, 65);
my_printf("conn %ld to: '%-.64s' user: '%-.32s' host:\
`%-.64s' (%-.64s)", 1, 0,0,0,0);
return 0;
}
#endif
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