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002eaee3 | 1 | /* -*-c-*- |
2 | * | |
7c3f378b | 3 | * $Id$ |
002eaee3 | 4 | * |
5 | * `printf'-style formatting for dynamic strings | |
6 | * | |
7 | * (c) 1999 Straylight/Edgeware | |
8 | */ | |
9 | ||
d4efbcd9 | 10 | /*----- Licensing notice --------------------------------------------------* |
002eaee3 | 11 | * |
12 | * This file is part of the mLib utilities library. | |
13 | * | |
14 | * mLib is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU Library General Public License as | |
16 | * published by the Free Software Foundation; either version 2 of the | |
17 | * License, or (at your option) any later version. | |
d4efbcd9 | 18 | * |
002eaee3 | 19 | * mLib is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22 | * GNU Library General Public License for more details. | |
d4efbcd9 | 23 | * |
002eaee3 | 24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with mLib; if not, write to the Free | |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, | |
27 | * MA 02111-1307, USA. | |
28 | */ | |
29 | ||
002eaee3 | 30 | /*----- Header files ------------------------------------------------------*/ |
31 | ||
b3a0ac5e MW |
32 | #include "config.h" |
33 | ||
002eaee3 | 34 | #include <ctype.h> |
002eaee3 | 35 | #include <math.h> |
36 | #include <stdarg.h> | |
37 | #include <stdio.h> | |
38 | #include <stdlib.h> | |
39 | #include <string.h> | |
40 | ||
5d45633f | 41 | #ifdef HAVE_FLOAT_H |
42 | # include <float.h> | |
43 | #endif | |
44 | ||
002eaee3 | 45 | #include "dstr.h" |
46 | ||
47 | /*----- Tunable constants -------------------------------------------------*/ | |
48 | ||
49 | /* | |
50 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured | |
51 | * before writing the formatted result. | |
52 | */ | |
53 | ||
54 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ | |
55 | ||
56 | /*----- Main code ---------------------------------------------------------*/ | |
57 | ||
58 | /* --- @dstr_vputf@ --- * | |
59 | * | |
60 | * Arguments: @dstr *d@ = pointer to a dynamic string block | |
61 | * @const char *p@ = pointer to @printf@-style format string | |
5a18a126 | 62 | * @va_list *ap@ = argument handle |
002eaee3 | 63 | * |
64 | * Returns: The number of characters written to the string. | |
65 | * | |
66 | * Use: As for @dstr_putf@, but may be used as a back-end to user- | |
67 | * supplied functions with @printf@-style interfaces. | |
68 | */ | |
69 | ||
5a18a126 | 70 | int dstr_vputf(dstr *d, const char *p, va_list *ap) |
002eaee3 | 71 | { |
72 | const char *q = p; | |
73 | size_t n = d->len; | |
74 | size_t sz; | |
75 | dstr dd = DSTR_INIT; | |
76 | ||
77 | while (*p) { | |
78 | unsigned f; | |
79 | int wd, prec; | |
80 | ||
393cf1d9 | 81 | #define f_short 1u |
82 | #define f_long 2u | |
83 | #define f_Long 4u | |
84 | #define f_wd 8u | |
85 | #define f_prec 16u | |
002eaee3 | 86 | |
87 | /* --- Most stuff gets passed on through --- */ | |
88 | ||
89 | if (*p != '%') { | |
90 | p++; | |
91 | continue; | |
92 | } | |
93 | ||
94 | /* --- Dump out what's between @q@ and @p@ --- */ | |
95 | ||
96 | DPUTM(d, q, p - q); | |
97 | p++; | |
98 | ||
99 | /* --- Sort out the various silly flags and things --- */ | |
100 | ||
101 | DPUTC(&dd, '%'); | |
102 | f = 0; | |
103 | sz = DSTR_PUTFSTEP; | |
104 | ||
105 | for (;;) { | |
106 | switch (*p) { | |
107 | ||
108 | /* --- Various simple flags --- */ | |
109 | ||
110 | case '+': | |
111 | case '-': | |
112 | case '#': | |
113 | case '0': | |
114 | goto putch; | |
115 | case 'h': | |
116 | f |= f_short; | |
117 | goto putch; | |
118 | case 'l': | |
119 | f |= f_long; | |
120 | goto putch; | |
121 | case 'L': | |
122 | f |= f_Long; | |
123 | goto putch; | |
124 | case 0: | |
125 | goto finished; | |
126 | ||
127 | /* --- Field widths and precision specifiers --- */ | |
128 | ||
129 | { | |
130 | int *ip; | |
131 | ||
132 | case '.': | |
133 | DPUTC(&dd, '.'); | |
134 | ip = ≺ | |
135 | f |= f_prec; | |
7c3f378b | 136 | p++; |
002eaee3 | 137 | goto getnum; |
138 | case '*': | |
139 | ip = &wd; | |
140 | f |= f_wd; | |
141 | goto getnum; | |
142 | default: | |
143 | if (isdigit((unsigned char)*p)) { | |
144 | f |= f_wd; | |
145 | ip = &wd; | |
146 | goto getnum; | |
147 | } | |
148 | DPUTC(d, *p); | |
149 | goto formatted; | |
d4efbcd9 | 150 | getnum: |
002eaee3 | 151 | *ip = 0; |
152 | if (*p == '*') { | |
5a18a126 | 153 | *ip = va_arg(*ap, int); |
002eaee3 | 154 | DENSURE(&dd, DSTR_PUTFSTEP); |
155 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); | |
156 | } else { | |
157 | *ip = *p - '0'; | |
158 | DPUTC(&dd, *p); | |
159 | p++; | |
160 | while (isdigit((unsigned char)*p)) { | |
161 | DPUTC(&dd, *p); | |
162 | *ip = 10 * *ip + *p++ - '0'; | |
163 | } | |
164 | } | |
165 | break; | |
166 | } | |
167 | ||
168 | /* --- Output formatting --- */ | |
169 | ||
170 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': | |
171 | DPUTC(&dd, *p); | |
172 | DPUTZ(&dd); | |
173 | if ((f & f_prec) && prec + 16 > sz) | |
174 | sz = prec + 16; | |
175 | if ((f & f_wd) && wd + 1> sz) | |
176 | sz = wd + 1; | |
177 | DENSURE(d, sz); | |
178 | if (f & f_long) | |
179 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 180 | va_arg(*ap, unsigned long)); |
002eaee3 | 181 | else |
182 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 183 | va_arg(*ap, unsigned int)); |
002eaee3 | 184 | goto formatted; |
185 | ||
186 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': | |
5d45633f | 187 | #ifdef HAVE_FLOAT_H |
002eaee3 | 188 | DPUTC(&dd, *p); |
189 | DPUTZ(&dd); | |
190 | if (*p == 'f') { | |
191 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; | |
192 | if (mx > sz) | |
193 | sz = mx; | |
194 | } | |
393cf1d9 | 195 | if (!(f & f_prec)) |
002eaee3 | 196 | prec = 6; |
393cf1d9 | 197 | else |
d4efbcd9 | 198 | sz += prec + 16; |
002eaee3 | 199 | if ((f & f_wd) && wd + 1 > sz) |
200 | sz = wd + 1; | |
201 | DENSURE(d, sz); | |
202 | if (f & f_Long) | |
203 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 204 | va_arg(*ap, long double)); |
002eaee3 | 205 | else |
206 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 207 | va_arg(*ap, double)); |
002eaee3 | 208 | goto formatted; |
5d45633f | 209 | #else |
210 | DPUTS(d, "<no float support>"); | |
211 | #endif | |
002eaee3 | 212 | |
213 | case 'c': | |
214 | DPUTC(&dd, *p); | |
215 | DPUTZ(&dd); | |
216 | if ((f & f_wd) && wd + 1> sz) | |
217 | sz = wd + 1; | |
218 | DENSURE(d, sz); | |
219 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 220 | va_arg(*ap, unsigned)); |
002eaee3 | 221 | goto formatted; |
222 | ||
223 | case 's': { | |
5a18a126 | 224 | const char *s = va_arg(*ap, const char *); |
002eaee3 | 225 | sz = strlen(s); |
226 | DPUTC(&dd, *p); | |
227 | DPUTZ(&dd); | |
228 | if (f & f_prec) | |
229 | sz = prec; | |
230 | if ((f & f_wd) && wd > sz) | |
231 | sz = wd; | |
232 | DENSURE(d, sz + 1); | |
233 | d->len += sprintf(d->buf + d->len, dd.buf, s); | |
234 | goto formatted; | |
235 | } | |
236 | ||
237 | case 'p': | |
238 | DPUTC(&dd, *p); | |
239 | DPUTZ(&dd); | |
240 | if ((f & f_prec) && prec + 16 > sz) | |
241 | sz = prec + 16; | |
242 | if ((f & f_wd) && wd + 1> sz) | |
243 | sz = wd + 1; | |
244 | DENSURE(d, sz); | |
245 | d->len += sprintf(d->buf + d->len, dd.buf, | |
5a18a126 | 246 | va_arg(*ap, const void *)); |
002eaee3 | 247 | goto formatted; |
248 | ||
249 | case 'n': | |
250 | if (f & f_long) | |
5a18a126 | 251 | *va_arg(*ap, long *) = (long)(d->len - n); |
002eaee3 | 252 | else if (f & f_short) |
5a18a126 | 253 | *va_arg(*ap, short *) = (short)(d->len - n); |
002eaee3 | 254 | else |
5a18a126 | 255 | *va_arg(*ap, int *) = (int)(d->len - n); |
002eaee3 | 256 | goto formatted; |
257 | ||
258 | /* --- Other random stuff --- */ | |
259 | ||
260 | putch: | |
261 | DPUTC(&dd, *p); | |
262 | p++; | |
263 | break; | |
264 | } | |
265 | } | |
266 | ||
267 | formatted: | |
268 | DRESET(&dd); | |
269 | q = ++p; | |
393cf1d9 | 270 | |
271 | #undef f_short | |
272 | #undef f_long | |
273 | #undef f_Long | |
274 | #undef f_wd | |
275 | #undef f_prec | |
002eaee3 | 276 | } |
277 | ||
278 | DPUTM(d, q, p - q); | |
279 | finished: | |
280 | DPUTZ(d); | |
281 | DDESTROY(&dd); | |
282 | return (d->len - n); | |
283 | } | |
284 | ||
285 | /* --- @dstr_putf@ --- * | |
286 | * | |
287 | * Arguments: @dstr *d@ = pointer to a dynamic string block | |
288 | * @const char *p@ = pointer to @printf@-style format string | |
289 | * @...@ = argument handle | |
290 | * | |
291 | * Returns: The number of characters written to the string. | |
292 | * | |
293 | * Use: Writes a piece of text to a dynamic string, doing @printf@- | |
294 | * style substitutions as it goes. Intended to be robust if | |
295 | * faced with malicious arguments, but not if the format string | |
296 | * itself is malicious. | |
297 | */ | |
298 | ||
299 | int dstr_putf(dstr *d, const char *p, ...) | |
300 | { | |
301 | int n; | |
302 | va_list ap; | |
303 | va_start(ap, p); | |
5a18a126 | 304 | n = dstr_vputf(d, p, &ap); |
002eaee3 | 305 | va_end(ap); |
306 | return (n); | |
307 | } | |
308 | ||
309 | /*----- That's all, folks -------------------------------------------------*/ |