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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; either version 2 of the License, or
(at your option) any later version.
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>
#include <assert.h>
/*
Limited snprintf() implementations
IMPLEMENTION:
Supports following formats:
%#d
%#u
%#.#s Note #.# is skiped
RETURN
length of result string
*/
int my_snprintf(char* to, size_t n, const char* fmt, ...)
{
va_list args;
int result;
va_start(args,fmt);
result= my_vsnprintf(to, n, fmt, args);
va_end(args);
return result;
}
int my_vsnprintf(char *to, size_t n, const char* fmt, va_list ap)
{
char *start=to, *end=to+n-1;
uint length, num_state, pre_zero;
for (; *fmt ; fmt++)
{
if (fmt[0] != '%')
{
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= num_state= pre_zero= 0;
for (;; fmt++)
{
if (my_isdigit(my_charset_latin1,*fmt))
{
if (!num_state)
{
length=length*10+ (uint) (*fmt-'0');
if (!length)
pre_zero= 1; /* first digit was 0 */
}
continue;
}
if (*fmt != '.' || num_state)
break;
num_state= 1;
}
if (*fmt == 'l')
fmt++;
if (*fmt == 's') /* String parameter */
{
reg2 char *par = va_arg(ap, char *);
uint plen,left_len = (uint)(end-to);
if (!par) par = (char*)"(null)";
plen = (uint) strlen(par);
if (left_len <= plen)
plen = left_len - 1;
to=strnmov(to,par,plen);
continue;
}
else if (*fmt == 'd' || *fmt == 'u') /* Integer parameter */
{
register int iarg;
char *to_start= to;
if ((uint) (end-to) < max(16,length))
break;
iarg = va_arg(ap, int);
if (*fmt == 'd')
to=int10_to_str((long) iarg,to, -10);
else
to=int10_to_str((long) (uint) iarg,to,10);
/* If %#d syntax was used, we have to pre-zero/pre-space the string */
if (length)
{
uint res_length= (uint) (to - to_start);
if (res_length < length)
{
uint diff= (length- res_length);
bmove_upp(to+diff, to, res_length);
bfill(to-res_length, diff, pre_zero ? '0' : ' ');
to+= diff;
}
}
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 (uint) (to - start);
}
#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 (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("conn %ld to: '%-.64s' user: '%-.32s' host:\
`%-.64s' (%-.64s)", 1, 0,0,0,0);
return 0;
}
#endif
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