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/* $Id$
* $URL$
*
* simple but quick snprintf() replacement
*
* Copyright (C) 2004 Michael Reinelt <michael@reinelt.co.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* derived from a patch from Martin Hejl which is
* Copyright (C) 2003 Martin Hejl (martin@hejl.de)
*
* This file is part of LCD4Linux.
*
* LCD4Linux 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, or (at your option)
* any later version.
*
* LCD4Linux 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int qprintf(char *str, size_t size, const char *format, ...)
* works like snprintf(), but format only knows about %d, %x, %u and %s
* and for the numbers an optional length like %<len>d. If <len> beginns
* with '0' the free space is filled with '0's, otherwise with ' '
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
static char *itoa(char *buffer, const size_t size, int value, unsigned int fixedlen, unsigned int fill0)
{
char *p;
int sign;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* remember sign of value */
sign = 0;
if (value < 0) {
sign = 1;
if (fill0)
fixedlen -= 1;
value = -value;
}
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
*--p = value % 10 + '0';
value = value / 10;
} while (value != 0 && p > buffer);
if (sign && !fill0 && p > buffer)
*--p = '-';
/* fill fixed length */
while (p > buffer && strlen(p) < fixedlen) {
if (fill0) {
*--p = '0';
} else {
*--p = ' ';
}
}
if (sign && fill0 && p > buffer)
*--p = '-';
return p;
}
static char *utoa(char *buffer, const size_t size, unsigned int value, unsigned int fixedlen, unsigned int fill0)
{
char *p;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
*--p = value % 10 + '0';
value = value / 10;
} while (value != 0 && p > buffer);
/* fill fixed length */
while (p > buffer && strlen(p) < fixedlen) {
if (fill0) {
*--p = '0';
} else {
*--p = ' ';
}
}
return p;
}
static char *utox(char *buffer, const size_t size, unsigned int value, unsigned int fixedlen, unsigned int fill0)
{
char *p;
int digit;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
digit = value % 16;
value = value / 16;
*--p = (digit < 10 ? '0' : 'a' - 10) + digit;
} while (value != 0 && p > buffer);
/* fill fixed length */
while (p > buffer && strlen(p) < fixedlen) {
if (fill0) {
*--p = '0';
} else {
*--p = ' ';
}
}
return p;
}
/*!
@function qprintf
@abstract quick print values into string
@discussion similar to snprintf(), but only support for "%s", "%d", "%u", "%x" with optional length for the numbers
like "%5d" (filled with ' ') or "%05x" (filled with '0')
@param str destination
@param size maximum length of destination string
@param format (like printf() with reduced number of formats)
@result length of produced string
*/
int qprintf(char *str, const size_t size, const char *format, ...)
{
va_list ap;
const char *src;
char *dst;
unsigned int len;
src = format;
dst = str;
len = 0;
va_start(ap, format);
/* use size-1 for terminating zero */
while (len < size - 1) {
if (*src == '%') {
char buf[12], *s;
int d;
unsigned int u;
unsigned int fixedlen = 0;
unsigned int fill0 = 0;
if (*++src == '0')
fill0 = 1;
while (*src >= '0' && *src <= '9') {
fixedlen = fixedlen * 10 + (*src - '0');
src++;
}
switch (*src) {
case 's':
src++;
s = va_arg(ap, char *);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'd':
src++;
d = va_arg(ap, int);
s = itoa(buf, sizeof(buf), d, fixedlen, fill0);
while (len < size && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'u':
src++;
u = va_arg(ap, unsigned int);
s = utoa(buf, sizeof(buf), u, fixedlen, fill0);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'x':
src++;
u = va_arg(ap, unsigned int);
s = utox(buf, sizeof(buf), u, fixedlen, fill0);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
default:
len++;
*dst++ = '%';
}
} else {
len++;
*dst++ = *src;
if (*src++ == '\0')
break;
}
}
va_end(ap);
/* enforce terminating zero */
if (len >= size - 1 && *(dst - 1) != '\0') {
len++;
*dst = '\0';
}
/* do not count terminating zero */
return len - 1;
}
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