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311 lines (282 loc) · 7.66 KB
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/*
* The Minimal snprintf() implementation
*
* Copyright (c) 2013,2014 Michal Ludvig <michal@logix.cz>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the auhor nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----
*
* This is a minimal snprintf() implementation optimised
* for embedded systems with a very limited program memory.
* mini_snprintf() doesn't support _all_ the formatting
* the glibc does but on the other hand is a lot smaller.
* Here are some numbers from my STM32 project (.bin file size):
* no snprintf(): 10768 bytes
* mini snprintf(): 11420 bytes (+ 652 bytes)
* glibc snprintf(): 34860 bytes (+24092 bytes)
* Wasting nearly 24kB of memory just for snprintf() on
* a chip with 32kB flash is crazy. Use mini_snprintf() instead.
*
*/
#include "mini-printf.h"
static int
mini_strlen(const char *s)
{
int len = 0;
while (s[len] != '\0') len++;
return len;
}
static int
mini_itoa(long value, unsigned int radix, int uppercase, int unsig,
char *buffer)
{
char *pbuffer = buffer;
int negative = 0;
int i, len;
/* No support for unusual radixes. */
if (radix > 16)
return 0;
if (value < 0 && !unsig) {
negative = 1;
value = -value;
}
/* This builds the string back to front ... */
do {
int digit = value % radix;
*(pbuffer++) = (digit < 10 ? '0' + digit : (uppercase ? 'A' : 'a') + digit - 10);
value /= radix;
} while (value > 0);
if (negative)
*(pbuffer++) = '-';
*(pbuffer) = '\0';
/* ... now we reverse it (could do it recursively but will
* conserve the stack space) */
len = (pbuffer - buffer);
for (i = 0; i < len / 2; i++) {
char j = buffer[i];
buffer[i] = buffer[len-i-1];
buffer[len-i-1] = j;
}
return len;
}
static int
mini_pad(char* ptr, int len, char pad_char, int pad_to, char *buffer)
{
int i;
int overflow = 0;
char * pbuffer = buffer;
if(pad_to == 0) pad_to = len;
if(len > pad_to) {
len = pad_to;
overflow = 1;
}
for(i = pad_to - len; i > 0; i --) {
*(pbuffer++) = pad_char;
}
for(i = len; i > 0; i --) {
*(pbuffer++) = *(ptr++);
}
len = pbuffer - buffer;
if(overflow) {
for (i = 0; i < 3 && pbuffer > buffer; i ++) {
*(pbuffer-- - 1) = '*';
}
}
return len;
}
struct mini_buff {
char *buffer, *pbuffer;
unsigned int buffer_len;
};
static int
_puts(char *s, int len, void *buf)
{
if(!buf) return len;
struct mini_buff *b = buf;
char * p0 = b->buffer;
int i;
/* Copy to buffer */
for (i = 0; i < len; i++) {
if(b->pbuffer == b->buffer + b->buffer_len - 1) {
break;
}
*(b->pbuffer ++) = s[i];
}
*(b->pbuffer) = 0;
return b->pbuffer - p0;
}
#ifdef MINI_PRINTF_ENABLE_OBJECTS
static int (*mini_handler) (void* data, void* obj, int ch, int lhint, char** bf) = 0;
static void (*mini_handler_freeor)(void* data, void*) = 0;
static void * mini_handler_data = 0;
void mini_printf_set_handler(
void* data,
int (*handler)(void* data, void* obj, int ch, int len_hint, char** buf),
void (*freeor)(void* data, void* buf))
{
mini_handler = handler;
mini_handler_freeor = freeor;
mini_handler_data = data;
}
#endif
int
mini_vsnprintf(char *buffer, unsigned int buffer_len, const char *fmt, va_list va)
{
struct mini_buff b;
b.buffer = buffer;
b.pbuffer = buffer;
b.buffer_len = buffer_len;
if(buffer_len == 0) buffer = (void*) 0;
int n = mini_vpprintf(_puts, (buffer != (void*)0)?&b:(void*)0, fmt, va);
if(buffer == (void*) 0) {
return n;
}
return b.pbuffer - b.buffer;
}
int
mini_vpprintf(int (*puts)(char* s, int len, void* buf), void* buf, const char *fmt, va_list va)
{
char bf[24];
char bf2[24];
char ch;
#ifdef MINI_PRINTF_ENABLE_OBJECTS
void* obj;
#endif
if(puts == (void*)0) {
/* run puts in counting mode. */
puts = _puts; buf = (void*)0;
}
int n = 0;
while ((ch=*(fmt++))) {
int len;
if (ch!='%') {
len = 1;
len = puts(&ch, len, buf);
} else {
char pad_char = ' ';
int pad_to = 0;
char l = 0;
char *ptr;
ch=*(fmt++);
/* Zero padding requested */
if (ch == '0') pad_char = '0';
while (ch >= '0' && ch <= '9') {
pad_to = pad_to * 10 + (ch - '0');
ch=*(fmt++);
}
if(pad_to > (signed int) sizeof(bf)) {
pad_to = sizeof(bf);
}
if (ch == 'l') {
l = 1;
ch=*(fmt++);
}
switch (ch) {
case 0:
goto end;
case 'u':
case 'd':
if(l) {
len = mini_itoa(va_arg(va, unsigned long), 10, 0, (ch=='u'), bf2);
} else {
if(ch == 'u') {
len = mini_itoa((unsigned long) va_arg(va, unsigned int), 10, 0, 1, bf2);
} else {
len = mini_itoa((long) va_arg(va, int), 10, 0, 0, bf2);
}
}
len = mini_pad(bf2, len, pad_char, pad_to, bf);
len = puts(bf, len, buf);
break;
case 'x':
case 'X':
if(l) {
len = mini_itoa(va_arg(va, unsigned long), 16, (ch=='X'), 1, bf2);
} else {
len = mini_itoa((unsigned long) va_arg(va, unsigned int), 16, (ch=='X'), 1, bf2);
}
len = mini_pad(bf2, len, pad_char, pad_to, bf);
len = puts(bf, len, buf);
break;
case 'c' :
ch = (char)(va_arg(va, int));
len = mini_pad(&ch, 1, pad_char, pad_to, bf);
len = puts(bf, len, buf);
break;
case 's' :
ptr = va_arg(va, char*);
len = mini_strlen(ptr);
if (pad_to > 0) {
len = mini_pad(ptr, len, pad_char, pad_to, bf);
len = puts(bf, len, buf);
} else {
len = puts(ptr, len, buf);
}
break;
#ifdef MINI_PRINTF_ENABLE_OBJECTS
case 'O' : /* Object by content (e.g. str) */
case 'R' : /* Object by representation (e.g. repr)*/
obj = va_arg(va, void*);
len = mini_handler(mini_handler_data, obj, ch, pad_to, &ptr);
if (pad_to > 0) {
len = mini_pad(ptr, len, pad_char, pad_to, bf);
len = puts(bf, len, buf);
} else {
len = puts(ptr, len, buf);
}
mini_handler_freeor(mini_handler_data, ptr);
break;
#endif
default:
len = 1;
len = puts(&ch, len, buf);
break;
}
}
n = n + len;
}
end:
return n;
}
int
mini_snprintf(char* buffer, unsigned int buffer_len, const char *fmt, ...)
{
int ret;
va_list va;
va_start(va, fmt);
ret = mini_vsnprintf(buffer, buffer_len, fmt, va);
va_end(va);
return ret;
}
int
mini_pprintf(int (*puts)(char*s, int len, void* buf), void* buf, const char *fmt, ...)
{
int ret;
va_list va;
va_start(va, fmt);
ret = mini_vpprintf(puts, buf, fmt, va);
va_end(va);
return ret;
}