1037 lines
29 KiB
C
1037 lines
29 KiB
C
/* snprintf - compatibility implementation of snprintf, vsnprintf
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*
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* Copyright (c) 2013, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <errno.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#endif
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/* for test */
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/* #define SNPRINTF_TEST 1 */
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#ifdef SNPRINTF_TEST
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#define snprintf my_snprintf
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#define vsnprintf my_vsnprintf
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#endif /* SNPRINTF_TEST */
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int snprintf(char* str, size_t size, const char* format, ...);
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int vsnprintf(char* str, size_t size, const char* format, va_list arg);
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/**
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* Very portable snprintf implementation, limited in functionality,
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* esp. for %[capital] %[nonportable] and so on. Reduced float functionality,
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* mostly in formatting and range (e+-16), for %f and %g.
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*
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* %s, %d, %u, %i, %x, %c, %n and %% are fully supported.
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* This includes width, precision, flags 0- +, and *(arg for wid,prec).
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* %f, %g, %m, %p have reduced support, support for wid,prec,flags,*, but
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* less floating point range, no %e formatting for %g.
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*/
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int snprintf(char* str, size_t size, const char* format, ...)
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{
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int r;
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va_list args;
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va_start(args, format);
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r = vsnprintf(str, size, format, args);
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va_end(args);
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return r;
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}
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/** add padding to string */
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static void
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print_pad(char** at, size_t* left, int* ret, char p, int num)
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{
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while(num--) {
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if(*left > 1) {
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*(*at)++ = p;
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(*left)--;
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}
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(*ret)++;
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}
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}
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/** get negative symbol, 0 if none */
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static char
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get_negsign(int negative, int plus, int space)
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{
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if(negative)
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return '-';
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if(plus)
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return '+';
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if(space)
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return ' ';
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return 0;
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}
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#define PRINT_DEC_BUFSZ 32 /* 20 is enough for 64 bit decimals */
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/** print decimal into buffer, returns length */
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static int
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print_dec(char* buf, int max, unsigned int value)
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{
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = '0' + value % 10;
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value /= 10;
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}
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return i;
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}
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/** print long decimal into buffer, returns length */
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static int
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print_dec_l(char* buf, int max, unsigned long value)
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{
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = '0' + value % 10;
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value /= 10;
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}
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return i;
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}
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/** print long decimal into buffer, returns length */
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static int
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print_dec_ll(char* buf, int max, unsigned long long value)
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{
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = '0' + value % 10;
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value /= 10;
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}
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return i;
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}
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/** print hex into buffer, returns length */
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static int
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print_hex(char* buf, int max, unsigned int value)
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{
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const char* h = "0123456789abcdef";
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = h[value & 0x0f];
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value >>= 4;
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}
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return i;
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}
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/** print long hex into buffer, returns length */
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static int
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print_hex_l(char* buf, int max, unsigned long value)
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{
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const char* h = "0123456789abcdef";
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = h[value & 0x0f];
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value >>= 4;
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}
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return i;
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}
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/** print long long hex into buffer, returns length */
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static int
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print_hex_ll(char* buf, int max, unsigned long long value)
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{
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const char* h = "0123456789abcdef";
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int i = 0;
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if(value == 0) {
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if(max > 0) {
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buf[0] = '0';
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i = 1;
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}
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} else while(value && i < max) {
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buf[i++] = h[value & 0x0f];
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value >>= 4;
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}
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return i;
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}
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/** copy string into result, reversed */
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static void
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spool_str_rev(char** at, size_t* left, int* ret, const char* buf, int len)
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{
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int i = len;
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while(i) {
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if(*left > 1) {
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*(*at)++ = buf[--i];
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(*left)--;
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} else --i;
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(*ret)++;
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}
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}
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/** copy string into result */
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static void
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spool_str(char** at, size_t* left, int* ret, const char* buf, int len)
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{
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int i;
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for(i=0; i<len; i++) {
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if(*left > 1) {
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*(*at)++ = buf[i];
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(*left)--;
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}
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(*ret)++;
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}
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}
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/** print number formatted */
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static void
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print_num(char** at, size_t* left, int* ret, int minw, int precision,
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int prgiven, int zeropad, int minus, int plus, int space,
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int zero, int negative, char* buf, int len)
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{
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int w = len; /* excludes minus sign */
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char s = get_negsign(negative, plus, space);
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if(minus) {
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/* left adjust the number into the field, space padding */
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/* calc numw = [sign][zeroes][number] */
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int numw = w;
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if(precision == 0 && zero) numw = 0;
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if(numw < precision) numw = precision;
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if(s) numw++;
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/* sign */
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if(s) print_pad(at, left, ret, s, 1);
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/* number */
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if(precision == 0 && zero) {
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/* "" for the number */
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} else {
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if(w < precision)
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print_pad(at, left, ret, '0', precision - w);
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spool_str_rev(at, left, ret, buf, len);
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}
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/* spaces */
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if(numw < minw)
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print_pad(at, left, ret, ' ', minw - numw);
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} else {
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/* pad on the left of the number */
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/* calculate numw has width of [sign][zeroes][number] */
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int numw = w;
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if(precision == 0 && zero) numw = 0;
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if(numw < precision) numw = precision;
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if(!prgiven && zeropad && numw < minw) numw = minw;
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else if(s) numw++;
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/* pad with spaces */
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if(numw < minw)
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print_pad(at, left, ret, ' ', minw - numw);
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/* print sign (and one less zeropad if so) */
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if(s) {
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print_pad(at, left, ret, s, 1);
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numw--;
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}
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/* pad with zeroes */
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if(w < numw)
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print_pad(at, left, ret, '0', numw - w);
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if(precision == 0 && zero)
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return;
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/* print the characters for the value */
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spool_str_rev(at, left, ret, buf, len);
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}
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}
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/** print %d and %i */
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static void
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print_num_d(char** at, size_t* left, int* ret, int value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = (value < 0);
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int zero = (value == 0);
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int len = print_dec(buf, (int)sizeof(buf),
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(unsigned int)(negative?-value:value));
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %ld and %li */
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static void
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print_num_ld(char** at, size_t* left, int* ret, long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = (value < 0);
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int zero = (value == 0);
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int len = print_dec_l(buf, (int)sizeof(buf),
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(unsigned long)(negative?-value:value));
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %lld and %lli */
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static void
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print_num_lld(char** at, size_t* left, int* ret, long long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = (value < 0);
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int zero = (value == 0);
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int len = print_dec_ll(buf, (int)sizeof(buf),
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(unsigned long long)(negative?-value:value));
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %u */
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static void
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print_num_u(char** at, size_t* left, int* ret, unsigned int value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_dec(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %lu */
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static void
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print_num_lu(char** at, size_t* left, int* ret, unsigned long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_dec_l(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %llu */
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static void
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print_num_llu(char** at, size_t* left, int* ret, unsigned long long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_dec_ll(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %x */
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static void
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print_num_x(char** at, size_t* left, int* ret, unsigned int value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_hex(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %lx */
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static void
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print_num_lx(char** at, size_t* left, int* ret, unsigned long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_hex_l(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %llx */
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static void
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print_num_llx(char** at, size_t* left, int* ret, unsigned long long value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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int len = print_hex_ll(buf, (int)sizeof(buf), value);
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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/** print %llp */
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static void
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print_num_llp(char** at, size_t* left, int* ret, void* value,
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int minw, int precision, int prgiven, int zeropad, int minus,
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int plus, int space)
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{
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char buf[PRINT_DEC_BUFSZ];
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int negative = 0;
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int zero = (value == 0);
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#if defined(UINTPTR_MAX) && defined(UINT32_MAX) && (UINTPTR_MAX == UINT32_MAX)
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/* avoid warning about upcast on 32bit systems */
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unsigned long long llvalue = (unsigned long)value;
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#else
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unsigned long long llvalue = (unsigned long long)value;
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#endif
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int len = print_hex_ll(buf, (int)sizeof(buf), llvalue);
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if(zero) {
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buf[0]=')';
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buf[1]='l';
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buf[2]='i';
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buf[3]='n';
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buf[4]='(';
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len = 5;
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} else {
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/* put '0x' in front of the (reversed) buffer result */
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if(len < PRINT_DEC_BUFSZ)
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buf[len++] = 'x';
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if(len < PRINT_DEC_BUFSZ)
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buf[len++] = '0';
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}
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print_num(at, left, ret, minw, precision, prgiven, zeropad, minus,
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plus, space, zero, negative, buf, len);
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}
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#define PRINT_FLOAT_BUFSZ 64 /* xx.yy with 20.20 about the max */
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/** spool remainder after the decimal point to buffer, in reverse */
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static int
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print_remainder(char* buf, int max, double r, int prec)
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{
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unsigned long long cap = 1;
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unsigned long long value;
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int len, i;
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if(prec > 19) prec = 19; /* max we can do */
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if(max < prec) return 0;
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for(i=0; i<prec; i++) {
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cap *= 10;
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}
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r *= (double)cap;
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value = (unsigned long long)r;
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/* see if we need to round up */
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if(((unsigned long long)((r - (double)value)*10.0)) >= 5) {
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value++;
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/* that might carry to numbers before the comma, if so,
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* just ignore that rounding. failure because 64bitprintout */
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if(value >= cap)
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value = cap-1;
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}
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len = print_dec_ll(buf, max, value);
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while(len < prec) { /* pad with zeroes, e.g. if 0.0012 */
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buf[len++] = '0';
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}
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if(len < max)
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buf[len++] = '.';
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return len;
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}
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|
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/** spool floating point to buffer */
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static int
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print_float(char* buf, int max, double value, int prec)
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{
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/* as xxx.xxx if prec==0, no '.', with prec decimals after . */
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/* no conversion for NAN and INF, because we do not want to require
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linking with -lm. */
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/* Thus, the conversions use 64bit integers to convert the numbers,
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* which makes 19 digits before and after the decimal point the max */
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unsigned long long whole = (unsigned long long)value;
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double remain = value - (double)whole;
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int len = 0;
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if(prec != 0)
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len = print_remainder(buf, max, remain, prec);
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len += print_dec_ll(buf+len, max-len, whole);
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return len;
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}
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|
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/** print %f */
|
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static void
|
|
print_num_f(char** at, size_t* left, int* ret, double value,
|
|
int minw, int precision, int prgiven, int zeropad, int minus,
|
|
int plus, int space)
|
|
{
|
|
char buf[PRINT_FLOAT_BUFSZ];
|
|
int negative = (value < 0);
|
|
int zero = 0;
|
|
int len;
|
|
if(!prgiven) precision = 6;
|
|
len = print_float(buf, (int)sizeof(buf), negative?-value:value,
|
|
precision);
|
|
print_num(at, left, ret, minw, 1, 0, zeropad, minus,
|
|
plus, space, zero, negative, buf, len);
|
|
}
|
|
|
|
/* rudimentary %g support */
|
|
static int
|
|
print_float_g(char* buf, int max, double value, int prec)
|
|
{
|
|
unsigned long long whole = (unsigned long long)value;
|
|
double remain = value - (double)whole;
|
|
int before = 0;
|
|
int len = 0;
|
|
|
|
/* number of digits before the decimal point */
|
|
while(whole > 0) {
|
|
before++;
|
|
whole /= 10;
|
|
}
|
|
whole = (unsigned long long)value;
|
|
|
|
if(prec > before && remain != 0.0) {
|
|
/* see if the last decimals are zero, if so, skip them */
|
|
len = print_remainder(buf, max, remain, prec-before);
|
|
while(len > 0 && buf[0]=='0') {
|
|
memmove(buf, buf+1, --len);
|
|
}
|
|
}
|
|
len += print_dec_ll(buf+len, max-len, whole);
|
|
return len;
|
|
}
|
|
|
|
|
|
/** print %g */
|
|
static void
|
|
print_num_g(char** at, size_t* left, int* ret, double value,
|
|
int minw, int precision, int prgiven, int zeropad, int minus,
|
|
int plus, int space)
|
|
{
|
|
char buf[PRINT_FLOAT_BUFSZ];
|
|
int negative = (value < 0);
|
|
int zero = 0;
|
|
int len;
|
|
if(!prgiven) precision = 6;
|
|
if(precision == 0) precision = 1;
|
|
len = print_float_g(buf, (int)sizeof(buf), negative?-value:value,
|
|
precision);
|
|
print_num(at, left, ret, minw, 1, 0, zeropad, minus,
|
|
plus, space, zero, negative, buf, len);
|
|
}
|
|
|
|
|
|
/** strnlen (compat implementation) */
|
|
static int
|
|
my_strnlen(const char* s, int max)
|
|
{
|
|
int i;
|
|
for(i=0; i<max; i++)
|
|
if(s[i]==0)
|
|
return i;
|
|
return max;
|
|
}
|
|
|
|
/** print %s */
|
|
static void
|
|
print_str(char** at, size_t* left, int* ret, char* s,
|
|
int minw, int precision, int prgiven, int minus)
|
|
{
|
|
int w;
|
|
/* with prec: no more than x characters from this string, stop at 0 */
|
|
if(prgiven)
|
|
w = my_strnlen(s, precision);
|
|
else w = (int)strlen(s); /* up to the nul */
|
|
if(w < minw && !minus)
|
|
print_pad(at, left, ret, ' ', minw - w);
|
|
spool_str(at, left, ret, s, w);
|
|
if(w < minw && minus)
|
|
print_pad(at, left, ret, ' ', minw - w);
|
|
}
|
|
|
|
/** print %c */
|
|
static void
|
|
print_char(char** at, size_t* left, int* ret, int c,
|
|
int minw, int minus)
|
|
{
|
|
if(1 < minw && !minus)
|
|
print_pad(at, left, ret, ' ', minw - 1);
|
|
print_pad(at, left, ret, c, 1);
|
|
if(1 < minw && minus)
|
|
print_pad(at, left, ret, ' ', minw - 1);
|
|
}
|
|
|
|
|
|
/**
|
|
* Print to string.
|
|
* str: string buffer for result. result will be null terminated.
|
|
* size: size of the buffer. null is put inside buffer.
|
|
* format: printf format string.
|
|
* arg: '...' arguments to print.
|
|
* returns number of characters. a null is printed after this.
|
|
* return number of bytes that would have been written
|
|
* if the buffer had been large enough.
|
|
*
|
|
* supported format specifiers:
|
|
* %s, %u, %d, %x, %i, %f, %g, %c, %p, %n.
|
|
* length: l, ll (for d, u, x).
|
|
* precision: 6.6d (for d, u, x)
|
|
* %f, %g precisions, 0.3f
|
|
* %20s, '.*s'
|
|
* and %%.
|
|
*/
|
|
int vsnprintf(char* str, size_t size, const char* format, va_list arg)
|
|
{
|
|
char* at = str;
|
|
size_t left = size;
|
|
int ret = 0;
|
|
const char* fmt = format;
|
|
int conv, minw, precision, prgiven, zeropad, minus, plus, space, length;
|
|
while(*fmt) {
|
|
/* copy string before % */
|
|
while(*fmt && *fmt!='%') {
|
|
if(left > 1) {
|
|
*at++ = *fmt++;
|
|
left--;
|
|
} else fmt++;
|
|
ret++;
|
|
}
|
|
|
|
/* see if we are at end */
|
|
if(!*fmt) break;
|
|
|
|
/* fetch next argument % designation from format string */
|
|
fmt++; /* skip the '%' */
|
|
|
|
/********************************/
|
|
/* get the argument designation */
|
|
/********************************/
|
|
/* we must do this vararg stuff inside this function for
|
|
* portability. Hence, get_designation, and print_designation
|
|
* are not their own functions. */
|
|
|
|
/* printout designation:
|
|
* conversion specifier: x, d, u, s, c, n, m, p
|
|
* flags: # not supported
|
|
* 0 zeropad (on the left)
|
|
* - left adjust (right by default)
|
|
* ' ' printspace for positive number (in - position).
|
|
* + alwayssign
|
|
* fieldwidth: [1-9][0-9]* minimum field width.
|
|
* if this is * then type int next argument specifies the minwidth.
|
|
* if this is negative, the - flag is set (with positive width).
|
|
* precision: period[digits]*, %.2x.
|
|
* if this is * then type int next argument specifies the precision.
|
|
* just '.' or negative value means precision=0.
|
|
* this is mindigits to print for d, i, u, x
|
|
* this is aftercomma digits for f
|
|
* this is max number significant digits for g
|
|
* maxnumber characters to be printed for s
|
|
* length: 0-none (int), 1-l (long), 2-ll (long long)
|
|
* notsupported: hh (char), h (short), L (long double), q, j, z, t
|
|
* Does not support %m$ and *m$ argument designation as array indices.
|
|
* Does not support %#x
|
|
*
|
|
*/
|
|
minw = 0;
|
|
precision = 1;
|
|
prgiven = 0;
|
|
zeropad = 0;
|
|
minus = 0;
|
|
plus = 0;
|
|
space = 0;
|
|
length = 0;
|
|
|
|
/* get flags in any order */
|
|
for(;;) {
|
|
if(*fmt == '0')
|
|
zeropad = 1;
|
|
else if(*fmt == '-')
|
|
minus = 1;
|
|
else if(*fmt == '+')
|
|
plus = 1;
|
|
else if(*fmt == ' ')
|
|
space = 1;
|
|
else break;
|
|
fmt++;
|
|
}
|
|
|
|
/* field width */
|
|
if(*fmt == '*') {
|
|
fmt++; /* skip char */
|
|
minw = va_arg(arg, int);
|
|
if(minw < 0) {
|
|
minus = 1;
|
|
minw = -minw;
|
|
}
|
|
} else while(*fmt >= '0' && *fmt <= '9') {
|
|
minw = minw*10 + (*fmt++)-'0';
|
|
}
|
|
|
|
/* precision */
|
|
if(*fmt == '.') {
|
|
fmt++; /* skip period */
|
|
prgiven = 1;
|
|
precision = 0;
|
|
if(*fmt == '*') {
|
|
fmt++; /* skip char */
|
|
precision = va_arg(arg, int);
|
|
if(precision < 0)
|
|
precision = 0;
|
|
} else while(*fmt >= '0' && *fmt <= '9') {
|
|
precision = precision*10 + (*fmt++)-'0';
|
|
}
|
|
}
|
|
|
|
/* length */
|
|
if(*fmt == 'l') {
|
|
fmt++; /* skip char */
|
|
length = 1;
|
|
if(*fmt == 'l') {
|
|
fmt++; /* skip char */
|
|
length = 2;
|
|
}
|
|
}
|
|
|
|
/* get the conversion */
|
|
if(!*fmt) conv = 0;
|
|
else conv = *fmt++;
|
|
|
|
/***********************************/
|
|
/* print that argument designation */
|
|
/***********************************/
|
|
switch(conv) {
|
|
case 'i':
|
|
case 'd':
|
|
if(length == 0)
|
|
print_num_d(&at, &left, &ret, va_arg(arg, int),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 1)
|
|
print_num_ld(&at, &left, &ret, va_arg(arg, long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 2)
|
|
print_num_lld(&at, &left, &ret,
|
|
va_arg(arg, long long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
case 'u':
|
|
if(length == 0)
|
|
print_num_u(&at, &left, &ret,
|
|
va_arg(arg, unsigned int),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 1)
|
|
print_num_lu(&at, &left, &ret,
|
|
va_arg(arg, unsigned long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 2)
|
|
print_num_llu(&at, &left, &ret,
|
|
va_arg(arg, unsigned long long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
case 'x':
|
|
if(length == 0)
|
|
print_num_x(&at, &left, &ret,
|
|
va_arg(arg, unsigned int),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 1)
|
|
print_num_lx(&at, &left, &ret,
|
|
va_arg(arg, unsigned long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
else if(length == 2)
|
|
print_num_llx(&at, &left, &ret,
|
|
va_arg(arg, unsigned long long),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
case 's':
|
|
print_str(&at, &left, &ret, va_arg(arg, char*),
|
|
minw, precision, prgiven, minus);
|
|
break;
|
|
case 'c':
|
|
print_char(&at, &left, &ret, va_arg(arg, int),
|
|
minw, minus);
|
|
break;
|
|
case 'n':
|
|
*va_arg(arg, int*) = ret;
|
|
break;
|
|
case 'm':
|
|
print_str(&at, &left, &ret, strerror(errno),
|
|
minw, precision, prgiven, minus);
|
|
break;
|
|
case 'p':
|
|
print_num_llp(&at, &left, &ret, va_arg(arg, void*),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
case '%':
|
|
print_pad(&at, &left, &ret, '%', 1);
|
|
break;
|
|
case 'f':
|
|
print_num_f(&at, &left, &ret, va_arg(arg, double),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
case 'g':
|
|
print_num_g(&at, &left, &ret, va_arg(arg, double),
|
|
minw, precision, prgiven, zeropad, minus, plus, space);
|
|
break;
|
|
/* unknown */
|
|
default:
|
|
case 0: break;
|
|
}
|
|
}
|
|
|
|
/* zero terminate */
|
|
if(left > 0)
|
|
*at = 0;
|
|
return ret;
|
|
}
|
|
|
|
#ifdef SNPRINTF_TEST
|
|
|
|
/** do tests */
|
|
#undef snprintf
|
|
#define DOTEST(bufsz, result, retval, ...) do { \
|
|
char buf[bufsz]; \
|
|
printf("now test %s\n", #__VA_ARGS__); \
|
|
int r=my_snprintf(buf, sizeof(buf), __VA_ARGS__); \
|
|
if(r != retval || strcmp(buf, result) != 0) { \
|
|
printf("error test(%s) was \"%s\":%d\n", \
|
|
""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
|
|
buf, r); \
|
|
exit(1); \
|
|
} \
|
|
r=snprintf(buf, sizeof(buf), __VA_ARGS__); \
|
|
if(r != retval || strcmp(buf, result) != 0) { \
|
|
printf("error test(%s) differs with system, \"%s\":%d\n", \
|
|
""#bufsz", "#result", "#retval", "#__VA_ARGS__, \
|
|
buf, r); \
|
|
exit(1); \
|
|
} \
|
|
printf("test(\"%s\":%d) passed\n", buf, r); \
|
|
} while(0);
|
|
|
|
/** test program */
|
|
int main(void)
|
|
{
|
|
int x = 0;
|
|
|
|
/* bufsize, expectedstring, expectedretval, snprintf arguments */
|
|
DOTEST(1024, "hello", 5, "hello");
|
|
DOTEST(1024, "h", 1, "h");
|
|
/* warning from gcc for format string, but it does work
|
|
* DOTEST(1024, "", 0, ""); */
|
|
|
|
DOTEST(3, "he", 5, "hello");
|
|
DOTEST(1, "", 7, "%d", 7823089);
|
|
|
|
/* test positive numbers */
|
|
DOTEST(1024, "0", 1, "%d", 0);
|
|
DOTEST(1024, "1", 1, "%d", 1);
|
|
DOTEST(1024, "9", 1, "%d", 9);
|
|
DOTEST(1024, "15", 2, "%d", 15);
|
|
DOTEST(1024, "ab15cd", 6, "ab%dcd", 15);
|
|
DOTEST(1024, "167", 3, "%d", 167);
|
|
DOTEST(1024, "7823089", 7, "%d", 7823089);
|
|
DOTEST(1024, " 12", 3, "%3d", 12);
|
|
DOTEST(1024, "012", 3, "%.3d", 12);
|
|
DOTEST(1024, "012", 3, "%3.3d", 12);
|
|
DOTEST(1024, "012", 3, "%03d", 12);
|
|
DOTEST(1024, " 012", 4, "%4.3d", 12);
|
|
DOTEST(1024, "", 0, "%.0d", 0);
|
|
|
|
/* test negative numbers */
|
|
DOTEST(1024, "-1", 2, "%d", -1);
|
|
DOTEST(1024, "-12", 3, "%3d", -12);
|
|
DOTEST(1024, " -2", 3, "%3d", -2);
|
|
DOTEST(1024, "-012", 4, "%.3d", -12);
|
|
DOTEST(1024, "-012", 4, "%3.3d", -12);
|
|
DOTEST(1024, "-012", 4, "%4.3d", -12);
|
|
DOTEST(1024, " -012", 5, "%5.3d", -12);
|
|
DOTEST(1024, "-12", 3, "%03d", -12);
|
|
DOTEST(1024, "-02", 3, "%03d", -2);
|
|
DOTEST(1024, "-15", 3, "%d", -15);
|
|
DOTEST(1024, "-7307", 5, "%d", -7307);
|
|
DOTEST(1024, "-12 ", 5, "%-5d", -12);
|
|
DOTEST(1024, "-00012", 6, "%-.5d", -12);
|
|
|
|
/* test + and space flags */
|
|
DOTEST(1024, "+12", 3, "%+d", 12);
|
|
DOTEST(1024, " 12", 3, "% d", 12);
|
|
|
|
/* test %u */
|
|
DOTEST(1024, "12", 2, "%u", 12);
|
|
DOTEST(1024, "0", 1, "%u", 0);
|
|
DOTEST(1024, "4294967295", 10, "%u", 0xffffffff);
|
|
|
|
/* test %x */
|
|
DOTEST(1024, "0", 1, "%x", 0);
|
|
DOTEST(1024, "c", 1, "%x", 12);
|
|
DOTEST(1024, "12ab34cd", 8, "%x", 0x12ab34cd);
|
|
|
|
/* test %llu, %lld */
|
|
DOTEST(1024, "18446744073709551615", 20, "%llu",
|
|
(long long)0xffffffffffffffff);
|
|
DOTEST(1024, "-9223372036854775808", 20, "%lld",
|
|
(long long)0x8000000000000000);
|
|
DOTEST(1024, "9223372036854775808", 19, "%llu",
|
|
(long long)0x8000000000000000);
|
|
|
|
/* test %s */
|
|
DOTEST(1024, "hello", 5, "%s", "hello");
|
|
DOTEST(1024, " hello", 10, "%10s", "hello");
|
|
DOTEST(1024, "hello ", 10, "%-10s", "hello");
|
|
DOTEST(1024, "he", 2, "%.2s", "hello");
|
|
DOTEST(1024, " he", 4, "%4.2s", "hello");
|
|
DOTEST(1024, " h", 4, "%4.2s", "h");
|
|
|
|
/* test %c */
|
|
DOTEST(1024, "a", 1, "%c", 'a');
|
|
/* warning from gcc for format string, but it does work
|
|
DOTEST(1024, " a", 5, "%5c", 'a');
|
|
DOTEST(1024, "a", 1, "%.0c", 'a'); */
|
|
|
|
/* test %n */
|
|
DOTEST(1024, "hello", 5, "hello%n", &x);
|
|
if(x != 5) { printf("the %%n failed\n"); exit(1); }
|
|
|
|
/* test %m */
|
|
errno = 0;
|
|
DOTEST(1024, "Success", 7, "%m");
|
|
|
|
/* test %p */
|
|
DOTEST(1024, "0x10", 4, "%p", (void*)0x10);
|
|
DOTEST(1024, "(nil)", 5, "%p", (void*)0x0);
|
|
|
|
/* test %% */
|
|
DOTEST(1024, "%", 1, "%%");
|
|
|
|
/* test %f */
|
|
DOTEST(1024, "0.000000", 8, "%f", 0.0);
|
|
DOTEST(1024, "0.00", 4, "%.2f", 0.0);
|
|
/* differs, "-0.00" DOTEST(1024, "0.00", 4, "%.2f", -0.0); */
|
|
DOTEST(1024, "234.00", 6, "%.2f", 234.005);
|
|
DOTEST(1024, "8973497.1246", 12, "%.4f", 8973497.12456);
|
|
DOTEST(1024, "-12.000000", 10, "%f", -12.0);
|
|
DOTEST(1024, "6", 1, "%.0f", 6.0);
|
|
|
|
DOTEST(1024, "6", 1, "%g", 6.0);
|
|
DOTEST(1024, "6.1", 3, "%g", 6.1);
|
|
DOTEST(1024, "6.15", 4, "%g", 6.15);
|
|
|
|
/* These format strings are from the code of NSD, Unbound, ldns */
|
|
|
|
DOTEST(1024, "abcdef", 6, "%s", "abcdef");
|
|
DOTEST(1024, "005", 3, "%03u", 5);
|
|
DOTEST(1024, "12345", 5, "%03u", 12345);
|
|
DOTEST(1024, "5", 1, "%d", 5);
|
|
DOTEST(1024, "(nil)", 5, "%p", NULL);
|
|
DOTEST(1024, "12345", 5, "%ld", (long)12345);
|
|
DOTEST(1024, "12345", 5, "%lu", (long)12345);
|
|
DOTEST(1024, " 12345", 12, "%12u", (unsigned)12345);
|
|
DOTEST(1024, "12345", 5, "%u", (unsigned)12345);
|
|
DOTEST(1024, "12345", 5, "%llu", (unsigned long long)12345);
|
|
DOTEST(1024, "12345", 5, "%x", 0x12345);
|
|
DOTEST(1024, "12345", 5, "%llx", (long long)0x12345);
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|
DOTEST(1024, "012345", 6, "%6.6d", 12345);
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|
DOTEST(1024, "012345", 6, "%6.6u", 12345);
|
|
DOTEST(1024, "1234.54", 7, "%g", 1234.54);
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|
DOTEST(1024, "123456789.54", 12, "%.12g", 123456789.54);
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|
DOTEST(1024, "3456789123456.54", 16, "%.16g", 3456789123456.54);
|
|
/* %24g does not work with 24 digits, not enough accuracy,
|
|
* the first 16 digits are correct */
|
|
DOTEST(1024, "12345", 5, "%3.3d", 12345);
|
|
DOTEST(1024, "000", 3, "%3.3d", 0);
|
|
DOTEST(1024, "001", 3, "%3.3d", 1);
|
|
DOTEST(1024, "012", 3, "%3.3d", 12);
|
|
DOTEST(1024, "-012", 4, "%3.3d", -12);
|
|
DOTEST(1024, "he", 2, "%.2s", "hello");
|
|
DOTEST(1024, "helloworld", 10, "%s%s", "hello", "world");
|
|
DOTEST(1024, "he", 2, "%.*s", 2, "hello");
|
|
DOTEST(1024, " hello", 7, "%*s", 7, "hello");
|
|
DOTEST(1024, "hello ", 7, "%*s", -7, "hello");
|
|
DOTEST(1024, "0", 1, "%c", '0');
|
|
DOTEST(1024, "A", 1, "%c", 'A');
|
|
DOTEST(1024, "", 1, "%c", 0);
|
|
DOTEST(1024, "\010", 1, "%c", 8);
|
|
DOTEST(1024, "%", 1, "%%");
|
|
DOTEST(1024, "0a", 2, "%02x", 0x0a);
|
|
DOTEST(1024, "bd", 2, "%02x", 0xbd);
|
|
DOTEST(1024, "12", 2, "%02ld", (long)12);
|
|
DOTEST(1024, "02", 2, "%02ld", (long)2);
|
|
DOTEST(1024, "02", 2, "%02u", (unsigned)2);
|
|
DOTEST(1024, "765432", 6, "%05u", (unsigned)765432);
|
|
DOTEST(1024, "10.234", 6, "%0.3f", 10.23421);
|
|
DOTEST(1024, "123456.234", 10, "%0.3f", 123456.23421);
|
|
DOTEST(1024, "123456789.234", 13, "%0.3f", 123456789.23421);
|
|
DOTEST(1024, "123456.23", 9, "%.2f", 123456.23421);
|
|
DOTEST(1024, "123456", 6, "%.0f", 123456.23421);
|
|
DOTEST(1024, "0123", 4, "%.4x", 0x0123);
|
|
DOTEST(1024, "00000123", 8, "%.8x", 0x0123);
|
|
DOTEST(1024, "ffeb0cde", 8, "%.8x", 0xffeb0cde);
|
|
DOTEST(1024, " 987654321", 10, "%10lu", (unsigned long)987654321);
|
|
DOTEST(1024, " 987654321", 12, "%12lu", (unsigned long)987654321);
|
|
DOTEST(1024, "987654321", 9, "%i", 987654321);
|
|
DOTEST(1024, "-87654321", 9, "%i", -87654321);
|
|
DOTEST(1024, "hello ", 16, "%-16s", "hello");
|
|
DOTEST(1024, " ", 16, "%-16s", "");
|
|
DOTEST(1024, "a ", 16, "%-16s", "a");
|
|
DOTEST(1024, "foobarfoobar ", 16, "%-16s", "foobarfoobar");
|
|
DOTEST(1024, "foobarfoobarfoobar", 18, "%-16s", "foobarfoobarfoobar");
|
|
|
|
/* combined expressions */
|
|
DOTEST(1024, "foo 1.0 size 512 edns", 21,
|
|
"foo %s size %d %s%s", "1.0", 512, "", "edns");
|
|
DOTEST(15, "foo 1.0 size 5", 21,
|
|
"foo %s size %d %s%s", "1.0", 512, "", "edns");
|
|
DOTEST(1024, "packet 1203ceff id", 18,
|
|
"packet %2.2x%2.2x%2.2x%2.2x id", 0x12, 0x03, 0xce, 0xff);
|
|
DOTEST(1024, "/tmp/testbound_123abcd.tmp", 26, "/tmp/testbound_%u%s%s.tmp", 123, "ab", "cd");
|
|
|
|
return 0;
|
|
}
|
|
#endif /* SNPRINTF_TEST */
|