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