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1 | /* -*-c-*- |
2 | * |
5a18a126 |
3 | * $Id: dputf.c,v 1.5 2002/01/13 13:30:48 mdw Exp $ |
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4 | * |
5 | * `printf'-style formatting for dynamic strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
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. |
18 | * |
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. |
23 | * |
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 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: dputf.c,v $ |
5a18a126 |
33 | * Revision 1.5 2002/01/13 13:30:48 mdw |
34 | * Change interface for @dstr_vputf@. |
35 | * |
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36 | * Revision 1.4 2001/06/22 19:35:29 mdw |
37 | * Find out whether @<float.h>@ exists (hack for uC-Linux). |
38 | * |
393cf1d9 |
39 | * Revision 1.3 2001/01/20 12:06:01 mdw |
40 | * Define flags with macros, to ensure unsignedness. |
41 | * |
e12e2b8d |
42 | * Revision 1.2 2000/08/15 21:26:45 mdw |
43 | * (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized. |
44 | * |
002eaee3 |
45 | * Revision 1.1 1999/10/04 21:44:47 mdw |
46 | * Move `dstr_putf' and `dstr_vputf' into a separate source file. |
47 | * |
48 | */ |
49 | |
50 | /*----- Header files ------------------------------------------------------*/ |
51 | |
52 | #include <ctype.h> |
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53 | #include <math.h> |
54 | #include <stdarg.h> |
55 | #include <stdio.h> |
56 | #include <stdlib.h> |
57 | #include <string.h> |
58 | |
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59 | #ifdef HAVE_FLOAT_H |
60 | # include <float.h> |
61 | #endif |
62 | |
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63 | #include "dstr.h" |
64 | |
65 | /*----- Tunable constants -------------------------------------------------*/ |
66 | |
67 | /* |
68 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured |
69 | * before writing the formatted result. |
70 | */ |
71 | |
72 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ |
73 | |
74 | /*----- Main code ---------------------------------------------------------*/ |
75 | |
76 | /* --- @dstr_vputf@ --- * |
77 | * |
78 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
79 | * @const char *p@ = pointer to @printf@-style format string |
5a18a126 |
80 | * @va_list *ap@ = argument handle |
002eaee3 |
81 | * |
82 | * Returns: The number of characters written to the string. |
83 | * |
84 | * Use: As for @dstr_putf@, but may be used as a back-end to user- |
85 | * supplied functions with @printf@-style interfaces. |
86 | */ |
87 | |
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88 | int dstr_vputf(dstr *d, const char *p, va_list *ap) |
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89 | { |
90 | const char *q = p; |
91 | size_t n = d->len; |
92 | size_t sz; |
93 | dstr dd = DSTR_INIT; |
94 | |
95 | while (*p) { |
96 | unsigned f; |
97 | int wd, prec; |
98 | |
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99 | #define f_short 1u |
100 | #define f_long 2u |
101 | #define f_Long 4u |
102 | #define f_wd 8u |
103 | #define f_prec 16u |
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104 | |
105 | /* --- Most stuff gets passed on through --- */ |
106 | |
107 | if (*p != '%') { |
108 | p++; |
109 | continue; |
110 | } |
111 | |
112 | /* --- Dump out what's between @q@ and @p@ --- */ |
113 | |
114 | DPUTM(d, q, p - q); |
115 | p++; |
116 | |
117 | /* --- Sort out the various silly flags and things --- */ |
118 | |
119 | DPUTC(&dd, '%'); |
120 | f = 0; |
121 | sz = DSTR_PUTFSTEP; |
122 | |
123 | for (;;) { |
124 | switch (*p) { |
125 | |
126 | /* --- Various simple flags --- */ |
127 | |
128 | case '+': |
129 | case '-': |
130 | case '#': |
131 | case '0': |
132 | goto putch; |
133 | case 'h': |
134 | f |= f_short; |
135 | goto putch; |
136 | case 'l': |
137 | f |= f_long; |
138 | goto putch; |
139 | case 'L': |
140 | f |= f_Long; |
141 | goto putch; |
142 | case 0: |
143 | goto finished; |
144 | |
145 | /* --- Field widths and precision specifiers --- */ |
146 | |
147 | { |
148 | int *ip; |
149 | |
150 | case '.': |
151 | DPUTC(&dd, '.'); |
152 | ip = ≺ |
153 | f |= f_prec; |
154 | goto getnum; |
155 | case '*': |
156 | ip = &wd; |
157 | f |= f_wd; |
158 | goto getnum; |
159 | default: |
160 | if (isdigit((unsigned char)*p)) { |
161 | f |= f_wd; |
162 | ip = &wd; |
163 | goto getnum; |
164 | } |
165 | DPUTC(d, *p); |
166 | goto formatted; |
167 | getnum: |
168 | *ip = 0; |
169 | if (*p == '*') { |
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170 | *ip = va_arg(*ap, int); |
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171 | DENSURE(&dd, DSTR_PUTFSTEP); |
172 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); |
173 | } else { |
174 | *ip = *p - '0'; |
175 | DPUTC(&dd, *p); |
176 | p++; |
177 | while (isdigit((unsigned char)*p)) { |
178 | DPUTC(&dd, *p); |
179 | *ip = 10 * *ip + *p++ - '0'; |
180 | } |
181 | } |
182 | break; |
183 | } |
184 | |
185 | /* --- Output formatting --- */ |
186 | |
187 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': |
188 | DPUTC(&dd, *p); |
189 | DPUTZ(&dd); |
190 | if ((f & f_prec) && prec + 16 > sz) |
191 | sz = prec + 16; |
192 | if ((f & f_wd) && wd + 1> sz) |
193 | sz = wd + 1; |
194 | DENSURE(d, sz); |
195 | if (f & f_long) |
196 | d->len += sprintf(d->buf + d->len, dd.buf, |
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197 | va_arg(*ap, unsigned long)); |
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198 | else |
199 | d->len += sprintf(d->buf + d->len, dd.buf, |
5a18a126 |
200 | va_arg(*ap, unsigned int)); |
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201 | goto formatted; |
202 | |
203 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': |
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204 | #ifdef HAVE_FLOAT_H |
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205 | DPUTC(&dd, *p); |
206 | DPUTZ(&dd); |
207 | if (*p == 'f') { |
208 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; |
209 | if (mx > sz) |
210 | sz = mx; |
211 | } |
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212 | if (!(f & f_prec)) |
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213 | prec = 6; |
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214 | else |
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215 | sz += prec + 16; |
216 | if ((f & f_wd) && wd + 1 > sz) |
217 | sz = wd + 1; |
218 | DENSURE(d, sz); |
219 | if (f & f_Long) |
220 | d->len += sprintf(d->buf + d->len, dd.buf, |
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221 | va_arg(*ap, long double)); |
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222 | else |
223 | d->len += sprintf(d->buf + d->len, dd.buf, |
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224 | va_arg(*ap, double)); |
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225 | goto formatted; |
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226 | #else |
227 | DPUTS(d, "<no float support>"); |
228 | #endif |
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229 | |
230 | case 'c': |
231 | DPUTC(&dd, *p); |
232 | DPUTZ(&dd); |
233 | if ((f & f_wd) && wd + 1> sz) |
234 | sz = wd + 1; |
235 | DENSURE(d, sz); |
236 | d->len += sprintf(d->buf + d->len, dd.buf, |
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237 | va_arg(*ap, unsigned)); |
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238 | goto formatted; |
239 | |
240 | case 's': { |
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241 | const char *s = va_arg(*ap, const char *); |
002eaee3 |
242 | sz = strlen(s); |
243 | DPUTC(&dd, *p); |
244 | DPUTZ(&dd); |
245 | if (f & f_prec) |
246 | sz = prec; |
247 | if ((f & f_wd) && wd > sz) |
248 | sz = wd; |
249 | DENSURE(d, sz + 1); |
250 | d->len += sprintf(d->buf + d->len, dd.buf, s); |
251 | goto formatted; |
252 | } |
253 | |
254 | case 'p': |
255 | DPUTC(&dd, *p); |
256 | DPUTZ(&dd); |
257 | if ((f & f_prec) && prec + 16 > sz) |
258 | sz = prec + 16; |
259 | if ((f & f_wd) && wd + 1> sz) |
260 | sz = wd + 1; |
261 | DENSURE(d, sz); |
262 | d->len += sprintf(d->buf + d->len, dd.buf, |
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263 | va_arg(*ap, const void *)); |
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264 | goto formatted; |
265 | |
266 | case 'n': |
267 | if (f & f_long) |
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268 | *va_arg(*ap, long *) = (long)(d->len - n); |
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269 | else if (f & f_short) |
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270 | *va_arg(*ap, short *) = (short)(d->len - n); |
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271 | else |
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272 | *va_arg(*ap, int *) = (int)(d->len - n); |
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273 | goto formatted; |
274 | |
275 | /* --- Other random stuff --- */ |
276 | |
277 | putch: |
278 | DPUTC(&dd, *p); |
279 | p++; |
280 | break; |
281 | } |
282 | } |
283 | |
284 | formatted: |
285 | DRESET(&dd); |
286 | q = ++p; |
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287 | |
288 | #undef f_short |
289 | #undef f_long |
290 | #undef f_Long |
291 | #undef f_wd |
292 | #undef f_prec |
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293 | } |
294 | |
295 | DPUTM(d, q, p - q); |
296 | finished: |
297 | DPUTZ(d); |
298 | DDESTROY(&dd); |
299 | return (d->len - n); |
300 | } |
301 | |
302 | /* --- @dstr_putf@ --- * |
303 | * |
304 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
305 | * @const char *p@ = pointer to @printf@-style format string |
306 | * @...@ = argument handle |
307 | * |
308 | * Returns: The number of characters written to the string. |
309 | * |
310 | * Use: Writes a piece of text to a dynamic string, doing @printf@- |
311 | * style substitutions as it goes. Intended to be robust if |
312 | * faced with malicious arguments, but not if the format string |
313 | * itself is malicious. |
314 | */ |
315 | |
316 | int dstr_putf(dstr *d, const char *p, ...) |
317 | { |
318 | int n; |
319 | va_list ap; |
320 | va_start(ap, p); |
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321 | n = dstr_vputf(d, p, &ap); |
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322 | va_end(ap); |
323 | return (n); |
324 | } |
325 | |
326 | /*----- That's all, folks -------------------------------------------------*/ |