tcpdump/missing/snprintf.c

56  * Common state
59 struct state {
65   int (*append_char)(struct state *, unsigned char);
66   int (*reserve)(struct state *, size_t);
72 sn_reserve (struct state *state, size_t n)
74   return state->s + n > state->theend;
78 sn_append_char (struct state *state, unsigned char c)
80   if (sn_reserve (state, 1)) {
83     *state->s++ = c;
91 as_reserve (struct state *state, size_t n)
93   if (state->s + n > state->theend) {
94     int off = state->s - state->str;
97     if (state->max_sz && state->sz >= state->max_sz)
100     state->sz = max(state->sz * 2, state->sz + n);
101     if (state->max_sz)
102       state->sz = min(state->sz, state->max_sz);
103     tmp = realloc (state->str, state->sz);
106     state->str = tmp;
107     state->s = state->str + off;
108     state->theend = state->str + state->sz - 1;
114 as_append_char (struct state *state, unsigned char c)
116   if(as_reserve (state, 1))
119     *state->s++ = c;
126 append_number(struct state *state,
142     if((*state->append_char)(state, rep[num % base]))
150     if((*state->append_char)(state, '0'))
163       if((*state->append_char)(state, '0'))
171       if((*state->append_char)(state, rep[10] + 23)) /* XXX */
173     if((*state->append_char)(state, '0'))
178     if((*state->append_char)(state, '-'))
182     if((*state->append_char)(state, '+'))
186     if((*state->append_char)(state, ' '))
193       char c = state->s[-i-1];
194       state->s[-i-1] = state->s[-len+i];
195       state->s[-len+i] = c;
199     if((*state->append_char)(state,  ' '))
206       char c = state->s[-i-1];
207       state->s[-i-1] = state->s[-len+i];
208       state->s[-len+i] = c;
215 append_string (struct state *state,
227       if((*state->append_char) (state, ' '))
231       if ((*state->append_char) (state, *arg++))
235       if ((*state->append_char) (state, *arg++))
240       if((*state->append_char) (state, ' '))
246 append_char(struct state *state,
252     if((*state->append_char) (state, ' '))
255   if((*state->append_char) (state, arg))
258     if((*state->append_char) (state, ' '))
281 xyzprintf (struct state *state, const char *char_format, va_list ap)
354 	if(append_char(state, va_arg(ap, int), width, flags))
358 	if (append_string(state,
379 	if (append_number (state, num, 10, "0123456789",
389 	if (append_number (state, arg, 10, "0123456789",
399 	if (append_number (state, arg, 010, "01234567",
409 	if (append_number (state, arg, 0x10, "0123456789abcdef",
419 	if (append_number (state, arg, 0x10, "0123456789ABCDEF",
427 	if (append_number (state, arg, 0x10, "0123456789ABCDEF",
434 	*arg = state->s - state->str;
441 	if ((*state->append_char)(state, c))
445 	if (   (*state->append_char)(state, '%')
446 	    || (*state->append_char)(state, c))
451       if ((*state->append_char) (state, c))
564   struct state state;
566   state.max_sz = max_sz;
567   state.sz     = 1;
568   state.str    = malloc(state.sz);
569   if (state.str == NULL) {
573   state.s = state.str;
574   state.theend = state.s + state.sz - 1;
575   state.append_char = as_append_char;
576   state.reserve     = as_reserve;
578   st = xyzprintf (&state, format, args);
580     free (state.str);
586     *state.s = '\0';
587     len = state.s - state.str;
588     tmp = realloc (state.str, len+1);
590       free (state.str);
605   struct state state;
609   state.max_sz = 0;
610   state.sz     = sz;
611   state.str    = ustr;
612   state.s      = ustr;
613   state.theend = ustr + sz - 1;
614   state.append_char = sn_append_char;
615   state.reserve     = sn_reserve;
617   ret = xyzprintf (&state, format, args);
618   *state.s = '\0';
622     return state.s - state.str;