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