620 lines
13 KiB
C
620 lines
13 KiB
C
/*
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* Copyright (c) 1995-1997, 1999 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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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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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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RCSID("$Id: snprintf.c,v 1.24 1999/12/02 16:58:52 joda Exp $");
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#endif
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <roken.h>
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enum format_flags {
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minus_flag = 1,
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plus_flag = 2,
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space_flag = 4,
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alternate_flag = 8,
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zero_flag = 16
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};
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/*
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* Common state
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*/
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struct state {
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unsigned char *str;
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unsigned char *s;
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unsigned char *theend;
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size_t sz;
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size_t max_sz;
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int (*append_char)(struct state *, unsigned char);
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int (*reserve)(struct state *, size_t);
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/* XXX - methods */
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};
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#ifndef HAVE_VSNPRINTF
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static int
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sn_reserve (struct state *state, size_t n)
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{
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return state->s + n > state->theend;
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}
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static int
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sn_append_char (struct state *state, unsigned char c)
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{
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if (sn_reserve (state, 1)) {
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return 1;
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} else {
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*state->s++ = c;
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return 0;
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}
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}
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#endif
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static int
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as_reserve (struct state *state, size_t n)
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{
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if (state->s + n > state->theend) {
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int off = state->s - state->str;
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unsigned char *tmp;
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if (state->max_sz && state->sz >= state->max_sz)
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return 1;
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state->sz = max(state->sz * 2, state->sz + n);
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if (state->max_sz)
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state->sz = min(state->sz, state->max_sz);
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tmp = realloc (state->str, state->sz);
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if (tmp == NULL)
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return 1;
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state->str = tmp;
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state->s = state->str + off;
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state->theend = state->str + state->sz - 1;
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}
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return 0;
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}
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static int
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as_append_char (struct state *state, unsigned char c)
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{
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if(as_reserve (state, 1))
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return 1;
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else {
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*state->s++ = c;
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return 0;
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}
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}
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static int
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append_number(struct state *state,
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unsigned long num, unsigned base, char *rep,
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int width, int prec, int flags, int minusp)
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{
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int len = 0;
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int i;
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/* given precision, ignore zero flag */
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if(prec != -1)
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flags &= ~zero_flag;
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else
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prec = 1;
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/* zero value with zero precision -> "" */
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if(prec == 0 && num == 0)
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return 0;
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do{
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if((*state->append_char)(state, rep[num % base]))
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return 1;
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len++;
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num /= base;
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}while(num);
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prec -= len;
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/* pad with prec zeros */
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while(prec-- > 0){
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if((*state->append_char)(state, '0'))
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return 1;
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len++;
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}
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/* add length of alternate prefix (added later) to len */
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if(flags & alternate_flag && (base == 16 || base == 8))
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len += base / 8;
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/* pad with zeros */
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if(flags & zero_flag){
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width -= len;
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if(minusp || (flags & space_flag) || (flags & plus_flag))
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width--;
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while(width-- > 0){
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if((*state->append_char)(state, '0'))
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return 1;
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len++;
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}
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}
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/* add alternate prefix */
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if(flags & alternate_flag && (base == 16 || base == 8)){
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if(base == 16)
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if((*state->append_char)(state, rep[10] + 23)) /* XXX */
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return 1;
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if((*state->append_char)(state, '0'))
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return 1;
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}
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/* add sign */
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if(minusp){
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if((*state->append_char)(state, '-'))
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return 1;
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len++;
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} else if(flags & plus_flag) {
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if((*state->append_char)(state, '+'))
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return 1;
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len++;
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} else if(flags & space_flag) {
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if((*state->append_char)(state, ' '))
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return 1;
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len++;
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}
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if(flags & minus_flag)
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/* swap before padding with spaces */
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for(i = 0; i < len / 2; i++){
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char c = state->s[-i-1];
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state->s[-i-1] = state->s[-len+i];
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state->s[-len+i] = c;
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}
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width -= len;
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while(width-- > 0){
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if((*state->append_char)(state, ' '))
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return 1;
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len++;
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}
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if(!(flags & minus_flag))
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/* swap after padding with spaces */
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for(i = 0; i < len / 2; i++){
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char c = state->s[-i-1];
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state->s[-i-1] = state->s[-len+i];
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state->s[-len+i] = c;
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}
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return 0;
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}
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static int
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append_string (struct state *state,
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unsigned char *arg,
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int width,
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int prec,
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int flags)
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{
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if(prec != -1)
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width -= prec;
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else
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width -= strlen((char *)arg);
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if(!(flags & minus_flag))
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while(width-- > 0)
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if((*state->append_char) (state, ' '))
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return 1;
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if (prec != -1) {
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while (*arg && prec--)
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if ((*state->append_char) (state, *arg++))
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return 1;
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} else {
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while (*arg)
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if ((*state->append_char) (state, *arg++))
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return 1;
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}
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if(flags & minus_flag)
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while(width-- > 0)
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if((*state->append_char) (state, ' '))
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return 1;
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return 0;
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}
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static int
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append_char(struct state *state,
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unsigned char arg,
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int width,
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int flags)
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{
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while(!(flags & minus_flag) && --width > 0)
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if((*state->append_char) (state, ' '))
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return 1;
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if((*state->append_char) (state, arg))
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return 1;
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while((flags & minus_flag) && --width > 0)
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if((*state->append_char) (state, ' '))
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return 1;
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return 0;
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}
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/*
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* This can't be made into a function...
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*/
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#define PARSE_INT_FORMAT(res, arg, unsig) \
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if (long_flag) \
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res = (unsig long)va_arg(arg, unsig long); \
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else if (short_flag) \
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res = (unsig short)va_arg(arg, unsig short); \
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else \
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res = (unsig int)va_arg(arg, unsig int)
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/*
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* zyxprintf - return 0 or -1
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*/
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static int
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xyzprintf (struct state *state, const char *char_format, va_list ap)
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{
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const unsigned char *format = (const unsigned char *)char_format;
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unsigned char c;
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while((c = *format++)) {
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if (c == '%') {
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int flags = 0;
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int width = 0;
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int prec = -1;
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int long_flag = 0;
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int short_flag = 0;
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/* flags */
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while((c = *format++)){
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if(c == '-')
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flags |= minus_flag;
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else if(c == '+')
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flags |= plus_flag;
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else if(c == ' ')
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flags |= space_flag;
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else if(c == '#')
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flags |= alternate_flag;
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else if(c == '0')
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flags |= zero_flag;
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else
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break;
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}
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if((flags & space_flag) && (flags & plus_flag))
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flags ^= space_flag;
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if((flags & minus_flag) && (flags & zero_flag))
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flags ^= zero_flag;
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/* width */
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if (isdigit(c))
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do {
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width = width * 10 + c - '0';
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c = *format++;
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} while(isdigit(c));
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else if(c == '*') {
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width = va_arg(ap, int);
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c = *format++;
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}
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/* precision */
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if (c == '.') {
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prec = 0;
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c = *format++;
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if (isdigit(c))
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do {
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prec = prec * 10 + c - '0';
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c = *format++;
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} while(isdigit(c));
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else if (c == '*') {
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prec = va_arg(ap, int);
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c = *format++;
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}
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}
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/* size */
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if (c == 'h') {
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short_flag = 1;
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c = *format++;
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} else if (c == 'l') {
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long_flag = 1;
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c = *format++;
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}
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switch (c) {
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case 'c' :
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if(append_char(state, va_arg(ap, int), width, flags))
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return -1;
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break;
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case 's' :
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if (append_string(state,
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va_arg(ap, unsigned char*),
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width,
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prec,
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flags))
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return -1;
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break;
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case 'd' :
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case 'i' : {
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long arg;
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unsigned long num;
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int minusp = 0;
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PARSE_INT_FORMAT(arg, ap, signed);
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if (arg < 0) {
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minusp = 1;
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num = -arg;
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} else
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num = arg;
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if (append_number (state, num, 10, "0123456789",
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width, prec, flags, minusp))
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return -1;
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break;
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}
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case 'u' : {
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unsigned long arg;
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PARSE_INT_FORMAT(arg, ap, unsigned);
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if (append_number (state, arg, 10, "0123456789",
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width, prec, flags, 0))
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return -1;
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break;
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}
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case 'o' : {
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unsigned long arg;
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PARSE_INT_FORMAT(arg, ap, unsigned);
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if (append_number (state, arg, 010, "01234567",
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width, prec, flags, 0))
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return -1;
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break;
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}
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case 'x' : {
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unsigned long arg;
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PARSE_INT_FORMAT(arg, ap, unsigned);
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if (append_number (state, arg, 0x10, "0123456789abcdef",
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width, prec, flags, 0))
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return -1;
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break;
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}
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case 'X' :{
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unsigned long arg;
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PARSE_INT_FORMAT(arg, ap, unsigned);
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if (append_number (state, arg, 0x10, "0123456789ABCDEF",
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width, prec, flags, 0))
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return -1;
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break;
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}
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case 'p' : {
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unsigned long arg = (unsigned long)va_arg(ap, void*);
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if (append_number (state, arg, 0x10, "0123456789ABCDEF",
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width, prec, flags, 0))
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return -1;
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break;
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}
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case 'n' : {
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int *arg = va_arg(ap, int*);
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*arg = state->s - state->str;
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break;
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}
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case '\0' :
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--format;
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/* FALLTHROUGH */
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case '%' :
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if ((*state->append_char)(state, c))
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return -1;
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break;
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default :
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if ( (*state->append_char)(state, '%')
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|| (*state->append_char)(state, c))
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return -1;
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break;
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}
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} else
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if ((*state->append_char) (state, c))
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return -1;
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}
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return 0;
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}
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#ifndef HAVE_SNPRINTF
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int
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snprintf (char *str, size_t sz, const char *format, ...)
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{
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va_list args;
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int ret;
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va_start(args, format);
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ret = vsnprintf (str, sz, format, args);
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#ifdef PARANOIA
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{
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int ret2;
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char *tmp;
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tmp = malloc (sz);
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if (tmp == NULL)
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abort ();
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ret2 = vsprintf (tmp, format, args);
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if (ret != ret2 || strcmp(str, tmp))
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abort ();
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free (tmp);
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}
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#endif
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va_end(args);
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return ret;
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}
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#endif
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#ifndef HAVE_ASPRINTF
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int
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asprintf (char **ret, const char *format, ...)
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{
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va_list args;
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int val;
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va_start(args, format);
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val = vasprintf (ret, format, args);
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#ifdef PARANOIA
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{
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int ret2;
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char *tmp;
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tmp = malloc (val + 1);
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if (tmp == NULL)
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abort ();
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ret2 = vsprintf (tmp, format, args);
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if (val != ret2 || strcmp(*ret, tmp))
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abort ();
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free (tmp);
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}
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#endif
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va_end(args);
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return val;
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}
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#endif
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#ifndef HAVE_ASNPRINTF
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int
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asnprintf (char **ret, size_t max_sz, const char *format, ...)
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{
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va_list args;
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int val;
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va_start(args, format);
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val = vasnprintf (ret, max_sz, format, args);
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#ifdef PARANOIA
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{
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int ret2;
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char *tmp;
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tmp = malloc (val + 1);
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if (tmp == NULL)
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abort ();
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ret2 = vsprintf (tmp, format, args);
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if (val != ret2 || strcmp(*ret, tmp))
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abort ();
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free (tmp);
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}
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#endif
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va_end(args);
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return val;
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}
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#endif
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#ifndef HAVE_VASPRINTF
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int
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vasprintf (char **ret, const char *format, va_list args)
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{
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return vasnprintf (ret, 0, format, args);
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}
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#endif
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#ifndef HAVE_VASNPRINTF
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int
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vasnprintf (char **ret, size_t max_sz, const char *format, va_list args)
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{
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int st;
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size_t len;
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struct state state;
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state.max_sz = max_sz;
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state.sz = 1;
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state.str = malloc(state.sz);
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if (state.str == NULL) {
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*ret = NULL;
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return -1;
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}
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state.s = state.str;
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state.theend = state.s + state.sz - 1;
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state.append_char = as_append_char;
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state.reserve = as_reserve;
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st = xyzprintf (&state, format, args);
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if (st) {
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free (state.str);
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*ret = NULL;
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return -1;
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} else {
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char *tmp;
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*state.s = '\0';
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len = state.s - state.str;
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tmp = realloc (state.str, len+1);
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if (tmp == NULL) {
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free (state.str);
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*ret = NULL;
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return -1;
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}
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*ret = tmp;
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return len;
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}
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}
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#endif
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#ifndef HAVE_VSNPRINTF
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int
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vsnprintf (char *str, size_t sz, const char *format, va_list args)
|
|
{
|
|
struct state state;
|
|
int ret;
|
|
unsigned char *ustr = (unsigned char *)str;
|
|
|
|
state.max_sz = 0;
|
|
state.sz = sz;
|
|
state.str = ustr;
|
|
state.s = ustr;
|
|
state.theend = ustr + sz - 1;
|
|
state.append_char = sn_append_char;
|
|
state.reserve = sn_reserve;
|
|
|
|
ret = xyzprintf (&state, format, args);
|
|
*state.s = '\0';
|
|
if (ret)
|
|
return sz;
|
|
else
|
|
return state.s - state.str;
|
|
}
|
|
#endif
|
|
|