libpcap/missing/snprintf.c

60  * Common state
63 struct state {
69   int (*append_char)(struct state *, unsigned char);
70   int (*reserve)(struct state *, size_t);
76 sn_reserve (struct state *state, size_t n)
78   return state->s + n > state->theend;
82 sn_append_char (struct state *state, unsigned char c)
84   if (sn_reserve (state, 1)) {
87     *state->s++ = c;
95 as_reserve (struct state *state, size_t n)
97   if (state->s + n > state->theend) {
98     int off = state->s - state->str;
101     if (state->max_sz && state->sz >= state->max_sz)
104     state->sz = max(state->sz * 2, state->sz + n);
105     if (state->max_sz)
106       state->sz = min(state->sz, state->max_sz);
107     tmp = realloc (state->str, state->sz);
110     state->str = tmp;
111     state->s = state->str + off;
112     state->theend = state->str + state->sz - 1;
118 as_append_char (struct state *state, unsigned char c)
120   if(as_reserve (state, 1))
123     *state->s++ = c;
130 append_number(struct state *state,
146     if((*state->append_char)(state, rep[num % base]))
154     if((*state->append_char)(state, '0'))
167       if((*state->append_char)(state, '0'))
175       if((*state->append_char)(state, rep[10] + 23)) /* XXX */
177     if((*state->append_char)(state, '0'))
182     if((*state->append_char)(state, '-'))
186     if((*state->append_char)(state, '+'))
190     if((*state->append_char)(state, ' '))
197       char c = state->s[-i-1];
198       state->s[-i-1] = state->s[-len+i];
199       state->s[-len+i] = c;
203     if((*state->append_char)(state,  ' '))
210       char c = state->s[-i-1];
211       state->s[-i-1] = state->s[-len+i];
212       state->s[-len+i] = c;
219 append_string (struct state *state,
231       if((*state->append_char) (state, ' '))
235       if ((*state->append_char) (state, *arg++))
239       if ((*state->append_char) (state, *arg++))
244       if((*state->append_char) (state, ' '))
250 append_char(struct state *state,
256     if((*state->append_char) (state, ' '))
259   if((*state->append_char) (state, arg))
262     if((*state->append_char) (state, ' '))
285 xyzprintf (struct state *state, const char *char_format, va_list ap)
358 	if(append_char(state, va_arg(ap, int), width, flags))
362 	if (append_string(state,
383 	if (append_number (state, num, 10, "0123456789",
393 	if (append_number (state, arg, 10, "0123456789",
403 	if (append_number (state, arg, 010, "01234567",
413 	if (append_number (state, arg, 0x10, "0123456789abcdef",
423 	if (append_number (state, arg, 0x10, "0123456789ABCDEF",
431 	if (append_number (state, arg, 0x10, "0123456789ABCDEF",
438 	*arg = state->s - state->str;
445 	if ((*state->append_char)(state, c))
449 	if (   (*state->append_char)(state, '%')
450 	    || (*state->append_char)(state, c))
455       if ((*state->append_char) (state, c))
570   struct state state;
572   state.max_sz = max_sz;
573   state.sz     = 1;
574   state.str    = malloc(state.sz);
575   if (state.str == NULL) {
579   state.s = state.str;
580   state.theend = state.s + state.sz - 1;
581   state.append_char = as_append_char;
582   state.reserve     = as_reserve;
584   st = xyzprintf (&state, format, args);
586     free (state.str);
592     *state.s = '\0';
593     len = state.s - state.str;
594     tmp = realloc (state.str, len+1);
596       free (state.str);
611   struct state state;
615   state.max_sz = 0;
616   state.sz     = sz;
617   state.str    = ustr;
618   state.s      = ustr;
619   state.theend = ustr + sz - 1;
620   state.append_char = sn_append_char;
621   state.reserve     = sn_reserve;
623   ret = xyzprintf (&state, format, args);
624   *state.s = '\0';
628     return state.s - state.str;