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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: dputf.c,v 1.3 2001/01/20 12:06:01 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 1.3 2001/01/20 12:06:01 mdw |
34 | * Define flags with macros, to ensure unsignedness. |
35 | * |
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36 | * Revision 1.2 2000/08/15 21:26:45 mdw |
37 | * (dstr_vputf): Don't try calling @va_arg@ on things @char@-sized. |
38 | * |
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39 | * Revision 1.1 1999/10/04 21:44:47 mdw |
40 | * Move `dstr_putf' and `dstr_vputf' into a separate source file. |
41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <ctype.h> |
47 | #include <float.h> |
48 | #include <math.h> |
49 | #include <stdarg.h> |
50 | #include <stdio.h> |
51 | #include <stdlib.h> |
52 | #include <string.h> |
53 | |
54 | #include "dstr.h" |
55 | |
56 | /*----- Tunable constants -------------------------------------------------*/ |
57 | |
58 | /* |
59 | * For each format specifier, at least @DSTR_PUTFSTEP@ bytes are ensured |
60 | * before writing the formatted result. |
61 | */ |
62 | |
63 | #define DSTR_PUTFSTEP 64 /* Buffer size for @putf@ */ |
64 | |
65 | /*----- Main code ---------------------------------------------------------*/ |
66 | |
67 | /* --- @dstr_vputf@ --- * |
68 | * |
69 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
70 | * @const char *p@ = pointer to @printf@-style format string |
71 | * @va_list ap@ = argument handle |
72 | * |
73 | * Returns: The number of characters written to the string. |
74 | * |
75 | * Use: As for @dstr_putf@, but may be used as a back-end to user- |
76 | * supplied functions with @printf@-style interfaces. |
77 | */ |
78 | |
79 | int dstr_vputf(dstr *d, const char *p, va_list ap) |
80 | { |
81 | const char *q = p; |
82 | size_t n = d->len; |
83 | size_t sz; |
84 | dstr dd = DSTR_INIT; |
85 | |
86 | while (*p) { |
87 | unsigned f; |
88 | int wd, prec; |
89 | |
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90 | #define f_short 1u |
91 | #define f_long 2u |
92 | #define f_Long 4u |
93 | #define f_wd 8u |
94 | #define f_prec 16u |
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95 | |
96 | /* --- Most stuff gets passed on through --- */ |
97 | |
98 | if (*p != '%') { |
99 | p++; |
100 | continue; |
101 | } |
102 | |
103 | /* --- Dump out what's between @q@ and @p@ --- */ |
104 | |
105 | DPUTM(d, q, p - q); |
106 | p++; |
107 | |
108 | /* --- Sort out the various silly flags and things --- */ |
109 | |
110 | DPUTC(&dd, '%'); |
111 | f = 0; |
112 | sz = DSTR_PUTFSTEP; |
113 | |
114 | for (;;) { |
115 | switch (*p) { |
116 | |
117 | /* --- Various simple flags --- */ |
118 | |
119 | case '+': |
120 | case '-': |
121 | case '#': |
122 | case '0': |
123 | goto putch; |
124 | case 'h': |
125 | f |= f_short; |
126 | goto putch; |
127 | case 'l': |
128 | f |= f_long; |
129 | goto putch; |
130 | case 'L': |
131 | f |= f_Long; |
132 | goto putch; |
133 | case 0: |
134 | goto finished; |
135 | |
136 | /* --- Field widths and precision specifiers --- */ |
137 | |
138 | { |
139 | int *ip; |
140 | |
141 | case '.': |
142 | DPUTC(&dd, '.'); |
143 | ip = ≺ |
144 | f |= f_prec; |
145 | goto getnum; |
146 | case '*': |
147 | ip = &wd; |
148 | f |= f_wd; |
149 | goto getnum; |
150 | default: |
151 | if (isdigit((unsigned char)*p)) { |
152 | f |= f_wd; |
153 | ip = &wd; |
154 | goto getnum; |
155 | } |
156 | DPUTC(d, *p); |
157 | goto formatted; |
158 | getnum: |
159 | *ip = 0; |
160 | if (*p == '*') { |
161 | *ip = va_arg(ap, int); |
162 | DENSURE(&dd, DSTR_PUTFSTEP); |
163 | dd.len += sprintf(dd.buf + dd.len, "%i", *ip); |
164 | } else { |
165 | *ip = *p - '0'; |
166 | DPUTC(&dd, *p); |
167 | p++; |
168 | while (isdigit((unsigned char)*p)) { |
169 | DPUTC(&dd, *p); |
170 | *ip = 10 * *ip + *p++ - '0'; |
171 | } |
172 | } |
173 | break; |
174 | } |
175 | |
176 | /* --- Output formatting --- */ |
177 | |
178 | case 'd': case 'i': case 'x': case 'X': case 'o': case 'u': |
179 | DPUTC(&dd, *p); |
180 | DPUTZ(&dd); |
181 | if ((f & f_prec) && prec + 16 > sz) |
182 | sz = prec + 16; |
183 | if ((f & f_wd) && wd + 1> sz) |
184 | sz = wd + 1; |
185 | DENSURE(d, sz); |
186 | if (f & f_long) |
187 | d->len += sprintf(d->buf + d->len, dd.buf, |
188 | va_arg(ap, unsigned long)); |
189 | else |
190 | d->len += sprintf(d->buf + d->len, dd.buf, |
191 | va_arg(ap, unsigned int)); |
192 | goto formatted; |
193 | |
194 | case 'e': case 'E': case 'f': case 'F': case 'g': case 'G': |
195 | DPUTC(&dd, *p); |
196 | DPUTZ(&dd); |
197 | if (*p == 'f') { |
198 | size_t mx = (f & f_Long ? LDBL_MAX_10_EXP : DBL_MAX_10_EXP) + 16; |
199 | if (mx > sz) |
200 | sz = mx; |
201 | } |
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202 | if (!(f & f_prec)) |
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203 | prec = 6; |
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204 | else |
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205 | sz += prec + 16; |
206 | if ((f & f_wd) && wd + 1 > sz) |
207 | sz = wd + 1; |
208 | DENSURE(d, sz); |
209 | if (f & f_Long) |
210 | d->len += sprintf(d->buf + d->len, dd.buf, |
211 | va_arg(ap, long double)); |
212 | else |
213 | d->len += sprintf(d->buf + d->len, dd.buf, |
214 | va_arg(ap, double)); |
215 | goto formatted; |
216 | |
217 | case 'c': |
218 | DPUTC(&dd, *p); |
219 | DPUTZ(&dd); |
220 | if ((f & f_wd) && wd + 1> sz) |
221 | sz = wd + 1; |
222 | DENSURE(d, sz); |
223 | d->len += sprintf(d->buf + d->len, dd.buf, |
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224 | va_arg(ap, unsigned)); |
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225 | goto formatted; |
226 | |
227 | case 's': { |
228 | const char *s = va_arg(ap, const char *); |
229 | sz = strlen(s); |
230 | DPUTC(&dd, *p); |
231 | DPUTZ(&dd); |
232 | if (f & f_prec) |
233 | sz = prec; |
234 | if ((f & f_wd) && wd > sz) |
235 | sz = wd; |
236 | DENSURE(d, sz + 1); |
237 | d->len += sprintf(d->buf + d->len, dd.buf, s); |
238 | goto formatted; |
239 | } |
240 | |
241 | case 'p': |
242 | DPUTC(&dd, *p); |
243 | DPUTZ(&dd); |
244 | if ((f & f_prec) && prec + 16 > sz) |
245 | sz = prec + 16; |
246 | if ((f & f_wd) && wd + 1> sz) |
247 | sz = wd + 1; |
248 | DENSURE(d, sz); |
249 | d->len += sprintf(d->buf + d->len, dd.buf, |
250 | va_arg(ap, const void *)); |
251 | goto formatted; |
252 | |
253 | case 'n': |
254 | if (f & f_long) |
255 | *va_arg(ap, long *) = (long)(d->len - n); |
256 | else if (f & f_short) |
257 | *va_arg(ap, short *) = (short)(d->len - n); |
258 | else |
259 | *va_arg(ap, int *) = (int)(d->len - n); |
260 | goto formatted; |
261 | |
262 | /* --- Other random stuff --- */ |
263 | |
264 | putch: |
265 | DPUTC(&dd, *p); |
266 | p++; |
267 | break; |
268 | } |
269 | } |
270 | |
271 | formatted: |
272 | DRESET(&dd); |
273 | q = ++p; |
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274 | |
275 | #undef f_short |
276 | #undef f_long |
277 | #undef f_Long |
278 | #undef f_wd |
279 | #undef f_prec |
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280 | } |
281 | |
282 | DPUTM(d, q, p - q); |
283 | finished: |
284 | DPUTZ(d); |
285 | DDESTROY(&dd); |
286 | return (d->len - n); |
287 | } |
288 | |
289 | /* --- @dstr_putf@ --- * |
290 | * |
291 | * Arguments: @dstr *d@ = pointer to a dynamic string block |
292 | * @const char *p@ = pointer to @printf@-style format string |
293 | * @...@ = argument handle |
294 | * |
295 | * Returns: The number of characters written to the string. |
296 | * |
297 | * Use: Writes a piece of text to a dynamic string, doing @printf@- |
298 | * style substitutions as it goes. Intended to be robust if |
299 | * faced with malicious arguments, but not if the format string |
300 | * itself is malicious. |
301 | */ |
302 | |
303 | int dstr_putf(dstr *d, const char *p, ...) |
304 | { |
305 | int n; |
306 | va_list ap; |
307 | va_start(ap, p); |
308 | n = dstr_vputf(d, p, ap); |
309 | va_end(ap); |
310 | return (n); |
311 | } |
312 | |
313 | /*----- That's all, folks -------------------------------------------------*/ |